The Amp Hour

Live from Serbia with Mike Harrison

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Welcome back, Mike Harrison (@mikelectricstuf)

  • Mike is in Belgrade with Chris, both attended and gave talks at Hackaday Belgrade (will be posted eventually)
  • Mike gave a talk about the Eidophor
  • They will also both attend Resonate.io but neither will speak.
  • The fun continues in the UK!
    • April 19th - Beer and electronics meetup! We'll be at the Yorkshire Gray on Theobalds Rd starting at 6:30.
    • April 20th - "Nerd Nite" event
    • April 21st - There is an Open Source Hardware Users Group meeting.
    • Mike recommends learning (uppercase) cyrillic to help get around places like Serbia or Russia.
    • Consulting projects continue to get more interesting, you can see them on whitewing.co.uk
      • There is a new project that was installed in terminal 2 of Heathrow airport
      • Holiday decorations in Hong Kong
        • There was a fixture to program physical locations of the assembled PCBs.
        • All high level comm was done using RS485.
        • Selfridges on Oxford St
          • Mike saved the setup time by starting a truck using a drill battery.
          • Uses the APA102.
          • Test jigs are critical in field jobs, especially time critical ones like busy installs.
          • Trade shows for other industries
            • Mike went to one for wearable tech, ended up going to underwater exploration instead.
            • Saw the company that makes the underwater buoy that Mike tore down. (Sonardyne)
            • Museums
              • Tesla museum was underwhelming, but Mike saw the first ever radio boat.
              • Chris and Mike went to the science museum together and saw the Galaksija (previous guest Voja Antonic's design)
              • Devices
                • Mike has been designing devices using loads of 0402 white LEDs. He also gets $0.01 4mm LEDs on aliexpress.
                • Osram Duris E
                • Reverse engineering
                  • Mike has experience reprogramming analog(ue) phones. This was done by modifying or moving the ESN of a device.
                  • The Sony D50 service manual that Dave tore down had a great service manual. Some of the old phones used to have those, but they were hard to get. 
                  • The eeproms were something like 9346
                  • Mike had to write disassemblers and then read the output to figure out what was going on. He also ended up tracing program flow using a logic analyzer
                  • Vodaphone had prepaid phones, others were not well implemented and ended up giving away free calls. 
                  • Mike ended up emulating the Dallas UID chips with a small board in order to reprogram the ESN.
                  • The last time Mike was on an Amp Hour episode he talked about using PICs.
                  • Write the bootloader first...and make sure it's rock solid!
                    • Image linked from Twitter, also features @szczys
                    ...more
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