The Amp Hour

By The Amp Hour (Chris Gammell and David L Jones)

The Amp Hour is a weekly conversation about electronics and the people who design them.... more

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How many episodes does The Amp Hour have?

The podcast currently has 745 episodes available.

The Amp Hour episodes:

February 16, 2021Living Through Chipageddon
We recorded video on the episode this week! Previously, Dave and Chris had tested Zencastr video.
https://www.youtube.com/watch?v=toFetYb4xvs
Chipageddon has arrived, a confluence of factors such as COVID and resulting forecasting errors (esp in automotive), the increasing need for parts to service the 5G ecosystem (towers and handsets), and general consolidation of the chip industry.
Tesla Founders
Samsung is looking at building a new fab in the US
Dave has been working with a "DIY Trezor wallet" that was only EAGLE files on GitHub
Eagle to KiCad conversion video in 5.99 (Also in 5.1.18)
Past guest Jesse Vincent talked about automating scripts at KiCon 2019
Chris is starting a course for people looking to become a technical consultant:
https://www.youtube.com/watch?v=5t5L8KAo0_g
Interested in being part of the beta group? You can apply here.
Schottky on the EEVblog forum did some amazing renders using Blender
Blender
Glamor shots were a thing in the early 90s. The Rock did one. Apparently there are still a few studios open in the US.
Dave made a DIY lightbox, based on Big Clive's setup. Chris uses this "light tent" that has a top porthole.
There was a live show with electronics YouTubers
Liam Fraser who was on the episode last week with the Raspberry Pi team wrote about the "journey to Raspberry silicon"
Dave is working on a new device that might need multiple micros swapped in. Chris mentioned this is the idea behind the Sparkfun Micromod system, which didn't seem super useful otherwise.
Reusing a commodity connector like the M.2 connector is not a new idea, but the M.2 looks cool!
Dave is not interested in learning Micropython or Circuitpython for this project because of the time involved.
...more
1h 18min
February 08, 2021Embedded Hardware with the Raspberry Pi Team
Welcome James Adams, Liam Fraser and Luke Wren of Raspberry Pi Trading!
Raspberry Pi Trading vs Raspberry Pi Foundation
The RP2040 is a new custom chip that Raspberry Pi released and is integrated on the Pico dev board
2016 start of RP2040
Why the Pico form factor? Driver was cost (common answer throughout this interview)
DIP form factor is interesting
Two layer board to keep costs down
PIO started in 2017. The idea has been around since the 60s though.
Like a processor but very stripped down. The main thing is that it's very deterministic.
Demos online like driving a VGA monitor (and a demo on how to do it yourself)
Limits are tight timing
The RP2040 documentation and getting started guide (datasheet)
It's extra easy to get started using MicroPython
Liam doing chip architecture work now, with new hardware experience in it
Being able to push and pull across the documentation
Raspberry Pi Trading has a flat structure so the engineers float across different projects.
They always maintain a super low cost focus. How does that affect things internally?
Building out test systems and automation at the factories
Cost engineering
Pushing cost savings back into silicon
Volume discounts
No reset button (because of cost)
SWD is via a few wires (because of cost)
Using another Pico as a programmer
Benchmarks:
.93 DMIPS
Two core
Symmetric cores for processing
Comparing 2 M0+ vs M4
Using 2nd core as debugger for first core (a forthcoming software project)
To answer Dave's question about the RP2040 being a microcontroller vs microprocessor in episode 528, it's a "flashless microntroller"
The flash is external (because of cost). They can create 20,000 die per wafer on 40 nm (!?!)
The prototype of the Pico/RP2040 devices had flash, but they decided it was better to trade out for SRAM.
The Pico team is 3 or 4 people mostly, with many more working on the Linux side of the house.
RP2040 SDK
Chris asks if the RP2040 will be used as co-processing on the RPi5, but it's unlikely (because of cost).
What about future chip development?
Will they design big silicon like for future versions of the Raspberry Pi? Probably not (because of cost)
RISC V? Why didn't the use it here?
During the time of the design freeze, the M0+ was the best fit, because it was low cycles per instruction and you can push the M0+ to higher clock rates.
Interested in buying RP2040 to integrate on your projects? Probably Q2 availability. It's tough to get your hands on Pico boards right now, as well, but you can sign up to be notified on different distributor sites.
The boards come on tape and reel (because of cost) and because they expect some people to integrate these directly into future projects using the castellated edges.
What are people missing about the boards?
USB host should be possible soon
Demos using USB ethernet
PIO
Interpolator
Super Mario Kart
RPi Pico's PIO vs the BBB PRU
Is the RP2040 Low power?
It was design on the 40 nm LP process.
Dormant / coma modes
Stops all of the clocks running
GPIO edge wakes it back up
Memory powerdowns
Dynamic power is pretty good, as that's what they optimized for
Static power is not as good
CM4
Genesis of the compute module
James designed RPi4
Temp ranges were targeted to work in harsher environments than the RPi4 would expect to see for commercial settings.
On the CM4 they swapped out ethernet phy
There is a compliance program for CM4 (Roger Thornton), so you can get your device tested using the same compliance house
The cost basis was not as we speculated in episode 528.
Why the dual micro HDMI on the RPi4? Because they expect some people to be using it like a computer.
The PI 400 is a keyboard based computer.
Chip choice on the Pi
2835 chip on the original
James used to work for Broadcom as well as Eben Upton (on TAH 97!)
RPi4 is 2711 on 28 nm
2835 was a co-processor for phones
Why are there reduced schematics for the RPi4?
How you can help
Pull requests to SDK
Contribute to Rust support
Got to blinky in a couple days with the chip
They are looking at FreeRTOS support in the future
Follow everyone on Twitter: James, Liam, and Luke
...more
1h 24min
February 01, 2021New Year, New Gear
TEAS - Test Equipment Acquisition Syndrome
Dave did a video comparing high voltage probes liked the HVP70
CMRR is improved with wymmetry in the probe design
Chris has acquired an active load, the Siglent SDL1020X-E\
Plugging some active loads with constant resistance / power into power supplies will make them hiccup because of the control loops interacting.
Chris also got a new soldering station, the Thermaltronics TMT-2000S
The lower end series are 470 kHz power supplies, the higher end Thermaltronics and Metcal stations use 13.56 MHz
The Metcal, Pace, JBC, Thermaltronics designs all use cartridges that heat to the proper temperature (as opposed to an adjustable temp). Thermaltronics calls this the Curie Heat Technology.
Tip to grip is the distance from your fingers to the end of the soldering iron. A shorter distance means more control. Unless you hold it like in the stock photos.
Chris has been using Small Rig clamps that have 1/4-20 threaded ends to interface with 3D prints. All you need to do is put a 6 mm hole in your 3D print and the clamp screws in and holds quite well.
This is the STL file for 121 GW
Dave predicts bench meters will make a comeback. The Fluke 37 is an example of this concept.
Chris is trying out the new Digilent Analog Discovery Pro, which was kindly sent to him
We had former Digilent president Clint Cole on the show a few years back
Though we're the last to talk about it, Raspberry Pi released the Pico board based on their custom chip, the RP2040.
The board comes on a reel!
Eric Schlaepfer (@TubeTimeUS) explains the costs of making chips on twitter. This is (likely) why the RP2040 doesn't have any internal flash.
Hackaday explains the PIO on the RP2040, an interesting peripheral that allows local processing of external events on the I/O.
So wait...is the RP2040 not a microcontroller? Find out next week when Chris interviews the Raspberry Pi team!
We will also talk about why they decided to go custom. We have had many guests on in the past few months/years talking about custom chips and the cost of chipmaking.
Mohamed Kassem
Tim Ansell
Brian Faith
What is the breakeven point?
Ladyada (Limor of adafruit) discusses the RP2040 and how they plan to integrate it into their projects as well
Pico board specification
Interested in learning assembly language? Check out this web based 6502 simulator called the tejotron
It was inspired by past guest Ben Eater
Beagle, SiFive and Seeed Studio are teaming up to create the BeagleV. This will be one of the first RISC V (sub $200) boards to run mainline Linux. It also has some pretty serious processing capabilities.
Chris and Dave discuss RISC V and how it's an open source ISA, not an open source chip design. Those also exist (such as past guest Claire Wolf's PicoRV design), but are not used on the BeagleV.
GM says they'll be all electric by 2035
...more
1h 13min
January 25, 2021Measuring Current with Matt Liberty
Welcome Matt Liberty, creator of the Joulescope!
The Joulescope solves the problem of measuring current with a high dynamic range.
There are very different sense resistors when measuring active current vs sleep current
Chris learned this when working on electrometers at Keithley.
The key thing is keeping the burden voltage low so it does not brown out low voltage systems
Chris is planning on using the Joulescope to measure the ABC board
Matt recommends starting with a power budget
It's also important to understand how to set up triggers for the joulescope, such as a GPIO
Joulescope sits in the middle of the device under test (DUT) and the power supply of the system.
The front panels can be swapped out. It comes with USB and binding posts by default.
Default view is multimeter view, but the real magic is looking at the power profile.
There are many pitfalls in low power electronics, such as backpowering a pin
Some people are using Joulescopes in opearations/deployment to test devices are performing as expected.
There is an open source Python library
Matt describes why some elements are open vs closed source
GPIB
LXI
Most traditional test equipment doese a capture and transfers the buffer (either to a computer or a screen)
The Joulescope and other headless equipment streams the data. This is similar to the HackRF (episode) and Saleae (episode).
Streaming vs Buffering
Isochronous timing
USB limitations means you cannot have too many Joulescopes that are plugged in to a single system.
Competition
High end test equipment from Keysight
uCurrent
Current ranger
Nano ranger
Otii Arc
Power Profiler 2 kit
This is a different way of working and might feel weird to people that grew up with knobs and dials
Matt's background is in consulting, mostly around firmware (though he does hardware and FPGAs)
A main task while consulting was working with the firmware to lower power, hence the desire to build the Joulescope
When hunting down current problems, Matt recommends "Divide and conquer". Other things to look at:
Check voltages across resistors
Pullups to VCC and not turning off power rails properly
Backpowering pins via protection diodes
Odd problems he has seen
Flux residue causing more leakage current than expected
Capacitor leakage (through the series resistance)
Matt was on Embedded.fm a couple of years ago
Lower power modes in STM32 clock tree
Matt's tactic for a simple low power system: "Turn everything on, do what you need, go back to sleep"
Matt has discussed struggles to get the product out in the world on the Consulting Forum.
Matt has been a solo consultant since 2011. He knows how to carve out consulting time, in this case his "client" was his own project.
But why develop a product?
Matt's Contract Manufacturer (CM) is 15 mins up the road
Matt has set up a test station at his CM and trained the technician who watches the devices that fail testing.
Parts on allocation
Lot size is still 500
Matt was recently on the Hello Blink show talking about hiring subcontractors. He has managed employees in the past at Hillcrest.
2 FPGAs internally, both of them Ice40 (but not using the open toolchain yet)
This is an isolated design, meaning you can safely plug it into your USB port and whatever is being tested is galvanically isolated.
Device side FPGA does math on the other side of the isolation barrier
The host side FPGA doesn't do as much
Device FPGA is there to be really responsive and to handle both ADCs in lockstep
Open source FPGA toos
Current model is the JS110, Matt is not sure on other models yet. He would like to focus on two models that try to go lower cost / higher performance (2 separate things)
CMRR
Possibly going to make a module that acts like a high current sensor
Supporting multiple versions of hardware
Matt's lab is all scripted using python
Buy a Joulescope for $799, more than 1/10th the price of a similar class of instrument.
Matt now has two distributors overseas, and is hoping to be part of the Digikey marketplace soon, to avoid needing to get on Approved Vendor Lists (AVLs) at large clients.
Twitter
Linkedin
...more
1h 21min
January 18, 2021Why IoT Is Difficult with Jonathan Beri
Welcome Jonathan Beri, founder of Golioth!
Today’s episode is sponsored by Mouser Electronics, who are discussing RISC-V. Check out their page on resources about RISC-V and how you can purchase kits that include chips using the open source ISA and learn more about how they can benefit your project.
What makes IoT so hard? "It's a system of systems"
Commercial off the shelf (COTS) systems are whitelabeled hardware with custom firmware/software
We use a brief example of a forest fire sensor using the ABC board
Firmware and security models
AWS IoT vs Azure IoT platforms
Implications of choosing a cloud provider
Jon has a background in hardware
He started at Google working on Firebase. Later they attempted a "Firebase for Arduino" that did not pan out.
He then joined Nest shortly after the Google acquisition, working on the communications.
Procurement and planning was interesting for Nest, especially because they added sensors that weren't available to the user / firmware right away.
Thread is a protocol that creates mesh network on a wide range of radios
Every device can talk to one another
It uses 2.4 GHz and is built on top of 802.15.4
How do thread devices get back to the internet?
OpenThread runs on nrf52840
Tutorial on OpenThread
After Nest, Jon went to Particle and worked on embedded
OpenThread based
There were lots of adventures with early Cat-M1 on the Ublox R410B
Particle bought RedBear, a Chinese startup with a lot of RF knowledge
Hardware is designed by Mohit Bhoite, who has been on Embedded.fm and also is a circuit sculpture master
Jon's last job was at WeWork (RIP?)
He wanted to learn more on the cloud side of things.
There were a number of WeWork sites spread out over 600 buildings. Each of these has a physical security need (door locks, turnstiles, etc)
The challenge is that his team didn't own or have the ability to change the hardware
Wanted to build the experience
Proxy (startup)
Going towards solving some of these problems
Physical constraints
ABC board
Vertically integrated embedded platform
Particle B523
Hardware matters
Android Things, now depricated
Building scooters
Nest door lock with Yale
FreeRTOS with AWS
Who do you hire to do the "in-between" hardware and the web?
Reasons IoT products fail
IT cares about setup, managing it, integrating into business process
Enterprise cnversations and managing devices
Fleet management
Fleet stuff is normally for the business person
Golioth
Jon wrote about CoAP and how it works
Chris wishes there is a site like BuiltWith...but for IoT devices
Protocols are an arbitrage opportunity
Internet is now standard part of RTOSes
Mongoose
Contiki
Riot OS
NuttX
HALs (Hardware Abstraction Layers) or PALs (Platform Abstraction Layers)
"Where's the porting guide vs where's the hello world"
Find Jon on
Twitter
Zephyr slack
The Interrupt (associated blog)
Sign up for more info about the upcoming platform on Golioth.io
More info about Jon's stealth mode startup on Stacey on IoT
Thanks to our Patrons for sponsoring today's show as well!
...more
1h 39min
January 11, 2021Open FPGA Toolchains and Machine Learning with Brian Faith of QuickLogic
Welcome Brian Faith, CEO of QuickLogic!
Past guest Tim Ansell introduced us to Brian, from their work together on the open toolchain.
They met at a tradeshow and Brian declined the first time, only to be convinced later.
QuickLogic IP licensing
Brian attended OR Conf in Bordeaux, where they were watching talks and excited by future growth of users of the open toolchain.
Resisted for a year
Brian started at QuickLogic during the "schematic era" (when FPGAs were designed using graphical schematic of logic blocks)
Previously their toolchain
Worked with early versions of Synplicity, but later switched to using Mentor Graphics Precision
There was no bundled simulator
Proprietary Place and Route (P&R)
The new QuickLogic approach is Symbiflow
It's also about the software engineer
A community member ported NuttX to the platform
What did QuickLogic give up, in order to use the Symbiflow toolchain? They had to publish the spec of the bitstream
What could you do with the spec of the bitstream? Why is it secret? Apparently, due to history and a generally closed off ecosystem in FPGAs.
QuickLogic is targetign selling to software engineers, not just FPGA engineers. This has become much easier with python targeting FPGAs (LiteX, Migen)
Software users will help enable more "mass customization"
Making software designs into silicon
Open Hardware Group
RISC V
Global Foundries at Munich
The Artic Pro 2 will be built on the Global Foundries 22FDX, which is their 22 nm process
Hardware/Software partitioning
They're building a test chip
QuickFeather
SensiML is the web-based machine learning toolset. The team came from the Intel Curie group.
SensiML was bought by QuickLogic at the beginning of 2019, but they still offer services for chips outside the QuickLogic portfolio as well.
Chris doesn't think a threshold detect algorithm would be up to the task in many cases.
QuickLogic and SensiML are sponsoring a Hackster contest targeted at projects that will help prevent climate change.
You send in your sensor data, SensiML gives back models you include as a "black box" algorithm
The web interfice allows you to dial in performance algorithms. You can also update the data/model later if you want to tweak based on new data or different parameters.
There is an example data set on github using a PM2.5 sensor
QuickLogic Open Reconfigurable Computing (QORC)
Size of the model depends on perfomance dialed in on the website
The models are set to run on on Cortex-M4, specifically the EOS S3
TensorFlow lite for microcontrollers
APIs for convolution
eFPGA = embedded FPGA
In the case of the EOS S3, it's roughly equivalent to 1000-2000 LUTS
USB in the FPGA without a dedicated (hard) USB core can do USB 1.1 full speed data speeds.
Videos and instructions
EOS and QuickFeather
Intro to S3
Intro to QuickFeather, EOS S3
How to Program QuickFeather using TinyFPGA
Hello World on QuickFeather
SensiML
Endpoint AI without Writing Code
SensiML Overview
Building a proof of concept
Community edition of SensiML gives you enough access for entering the contest, trying out models at home (non-commercial).
If you are developing a commercial product, SensiML has commercial subscription prices (Chris thinks they're reasonable, relative to hiring an FPGA/DSP engineer)
Removing the gyro using SensiML
Wrist worn wearables for applications like remote control
Industrial applications
Consumer is still a focus
Gerry Roston talking about data and monitoring for large scale auto manufacturing facilities
They are targeting many of their classic customers in the Automotive / MIL / Aero industry, as well as new ones. They are avoiding the server / datacenter industry.
QuickLogic licenses things like their IP blocks, memory blocks, math blocks for people to design into future silicon.
If you licence IP from QuickLogic (fabric), you will also be able to use Symbiflow for your silicon product.
Interested in learning more and giving it a try? Check out the Hackster contest
EOS S3 page
Great video tutorials
...more
1h 24min
January 04, 2021LEDs and EVs with Mike Harrison
Welcome back, Mike Harrison!
This is Mike's 5th appearance on The Amp Hour!
135
224
294
412
Mike's work is working on large light installions, so there has been a bit of a lockdown slowdown.
He's spending his time developing a product that will be a dimmer for AC based LEDs
Leading edge vs trailing edge dimming
SI8751
Mike mostly cares about turnoff time
DMX controlled dimmer
The supply chain is still catching up post COVID. Chris is having trouble finding (higher) pressure sensors and crystals.
Mike suggests MEMS oscillators, like the Microchip programmable oscillators
SGS Thompson
AKM fire
WS2812
LED accelerated life testing
Any instruction that involves "very carefully" means...no
Satellite that fell over
Daniel from Keysight alluded to a forklift giong through a 100K device
"It’s Perfectly Legal for Your Chinese Manufacturer to Copy Your Products" (maybe a bit click-baity)
Mike's clients mostly don't care about IP
PIC32
Hall effect sensing chip
Thresholding ADC
Mike likes the ease of MPLABX
Chris has beend dealing with Simplicity Studio
Old PIC parts required an external UART to talk to an RS485 transceiver (no internal UART)
The number of PIC variants
XRays are not prevalent in Australia because of required liceneses.
Both Mike and Dave have EVs
Mike has a 2018 Hyundai Kona
Christmas vacation commercial
35 kWh vs 64 kWh pack on a Tesla
Charging standards
CCS
Chademo
V2G (vehicle to grid)
CCS is a hardware standard spec'd by a software person
Qualcomm's "GreenPhy"
Kona and Kia had issues with chargers that support solar (didn't do detection for 3 phase)
Dave could start the EEVEV brand in Australia (a Sinclair C1 with 20 kWh battery?)
Xiaopeng china
Mike thinks self driving will happen a lot sooner than Dave does
Tesla fooled by someone's face
Cameras vs lidar
Mike says 5 years
You wouldn't download a car
SD card location on Hyundai
Gridserve
Charge at home is $0.015 per mile
Working from home
Cave Day
Mike's Micro-rant about Lattice charging $500 for software on old CPLDs
Next week we'll talk to Brian Faith from QuickLogic
Many thanks to our Patrons, for this and all the other episodes throughout 2020! We would be nothing without them. Check out Patreon.com/TheAmpHour if you’d like to join the crowd. A special thanks to our corporate sponsor Binho, who now distribute the Sensepeek PCBite.
Thanks to Juan Pablo Colasso for the picture of the LEDs
...more
2h 2min
December 28, 2020A Keyzermas Story
Welcome back, Jeff Keyzer (@MightyOhm)!
Jeff has been selling the MightyOhm Geiger Counter Kit and other products on Amazon
He has also been consulting lately, helping clients with hardware certifications, regulatory compliance and EMC.
These are separate tasks from product safety
RyanAir is buying 737-MAX airplanes
ESD is part of EMC
UL testing
CE combines EMC and product safety
Radiated emissions testing
Worst case testing
We have had experts on EMC on in the past
Howard Johnson
Henry Ott
Eric Bogatin
Near field vs far field
H field and E field are separate
Standards are changing for LiIon
IEC60950 was the main standard for a long time
IEC 62368 is replacing some of these standards
Polluted rivers in Cleveland caused the Nixon administration to start the EPA
Head tax in Seattle
Chris and Jeff have both been living in/near the civil unrest happening in the wake of George Floyd's murder. The news plays up what's happening during protests, which are mainly peaceful.
The Chaz
Economic impacts of COVID
Jeff has been working with older versions of Altium
Mentor changes its name to Siemens EDA
The Fusion / Eagle integration continues
The KiCad dev conversation that happened at "KiCon 2020" talked about the features coming in v6
We wanted to ask Jeff about abunch of the RF components we didn't understand in Episode 520
The main one was the power transistor and how it is tuned to particular frequencies
Miller capacitance between gate and drain
"Cut and try engineering"
Chris is still reeling from the Adrian Tang episode, with all the things he talked about.
Jeff was working on devices that went into WLAN and the now-defunct WiMax
All of the designs Jeff worked on were Gallium Arsenide
Former guests/sometimes co-host Piotr Esden-Tempski is running a new crowdfunding campaign for the Glasgow Interface Explorer (rev C)
Mark Rober is running a paid engineering course. Does it cost too much?
"Sounds like MBA projects"
Jeff has taken Tufte's visualizing information class
Joe Barnard on the CE Podcast
Starting real projects
Looking to relax? Watch Nick Offerman drink scotch in front of a fire in a "Yule Log" style video (for 10 hours!)
Many thanks to our Patrons, for this and all the other episodes throughout 2020! We would be nothing without them. Check out Patreon.com/TheAmpHour if you’d like to join the crowd. A special thanks to our corporate sponsor Binho, who now distribute the Sensepeek PCBite.
That’s a wrap on 2020! Thank you for listening!!
...more
1h 51min
December 21, 2020High Current Power Supplies with Fredrik Kensander
Welcome Fredrik Kensander of KraftPowercon!
Fredrik lives in Sweden, one of our first guests from there (Simone Giertz is also from Sweden originally, but now lives in the US)
KraftPowercon makes large scale Switch Mode Power Supplies (SMPS) that are in the range of 100-200 kW output.
Here is a datasheet of an example produce
There are a range of different industrial uses
HV cleaning with smokestack
Electrical Preciptator (see them working on YouTube)
High current electroplating
The high current unit can go as high as 30 kA at 10V
This is used for copper plating in PCB manufacturing
The pulse mode helps to get the plating to happen down into high aspect ratio vias.
Reverse pulse plating use sub-microscecond pulses.
These supplies also found a use in ballast water treatment on ships. The 3 phase power on ships is higher, so they need to have more margin in designs.
Safety in the lab includes plastic covers for dangerous sections, as well as the case being IP44 with front panel on. The lab gets hot because they're often burning so much power.
Manufacturing is on site, but the PCB assemblies are done elsewhere. It's the integration and testing.
Calibration is either done on test stands or in the units that are self calibrating.
What's the architecture of a device like this
EMC filter
24v digital board
3 phase goes to powermodule
700-800V DC
Half bridge with IGBTs
37 kHz switching
Snubber
5-10W
Reverse recovery on the diodes
Inductor
Current sensor
Hall effect
Isolation back to the control side of the board
The control loop needs to respond within 1 pulse, which is roughly 27 uS.
Pulse module is different, it has a lot of caps and an H bridge to deliver the pulses.
Supply chain for a device like this is the "secret sauce" of the company.
Founding of company was in 1935
They received a request to fix a 1937 battery charger.
Fredrik got in touch with Chris writing about "Zephyr without the RTOS part", trying to use similar methods that Zephyr does without taking on the entire RTOS.
He is the software manager at KraftPowercon and working on managing 40 different firmware versions.
He moved them from SVN to Git
Trying to make the implementations all modular
Autosar framework
Replicating the Zephyr API but maybe not using the whole thing
Using different interrupts
Profibus
Processor on each power control module
PRU on the AM3358 (Beaglebone Black)
Jay Carlson talking about STM32MP1
Measuring with scope
Unit testing each module
Test the output that might be going to the IGBT gate
The stack is multiple modules
KraftPowercon is looking for more people
Power factor correction (PFC)
Rick Hartley talking about differential pairs at Altium Live
Find Fredrik on LinkedIn
Or on Facebook
Many thanks to our Patrons! You can join at Patreon.com/TheAmpHour if you’d like to join the crowd. A special thanks to our corporate sponsor Binho, who now distribute the Sensepeek PCBite.
...more
1h 11min
December 14, 2020 Outdoor Laser Projection & Object Mapping with Daryl Tewksbury
Daryl is the former head designer at Laservision, a world leading Australian outdoor laser display and projection mapping company responsible for many of those incredible outdoor laser display such as the Marina Bay Sands in Singapore.
(Not directly discussed in the show) Sydney harbor tunnel “Soft Stop” sign for trucks that won’t fit:
Softstop™ Barrier System by LASERVISION from Laservision Mega Media on Vimeo.
He talks to Dave about the design and safety of lasers (Ion and solid state) and optical image projection systems for huge outdoor water wall and building displays, and the electronics and software involved in image projection modelling onto building and other objects.
Also FPGA’s, DE10 Nano, and ESP32’s.
Dary’s consulting company, TETDG
Many thanks to our Patrons! You can join at Patreon.com/TheAmpHour if you’d like to join the crowd. A special thanks to our corporate sponsor Binho, who now distribute the Sensepeek PCBite.
...more
1h 16min

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