Here’s something fun from [Chad Kapper] over on HackMakeMod: Escape Room Lockbox with the Cheap Yellow Display. You may have heard of the “cheap yellow display” (CYD), so-called due to the board’s ...
The device should now respond to esptool etc, and be programmable. Resetting the device may set it back to the broken program. I am using a SIM card from https://hologram.io/, with the Pilot (1MB) ...
Several makes of multi channel relay boards that are controlled over an RS232 serial port. I am testing with a model that uses a ULN2803A chip also noted as a darlington array and an RS232 level ...
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