Video tutorial https://www.youtube.com/watch?v=rOmO3GhsPts
Assembling case, battery and keypad hat https://www.youtube.com/watch?v=oVwm95j3NXk
Purchasing:
- The Lilygo Tdisplay is a cheap and small ESP32/screen development board.
- You can either attach a keypad membrane or use the breakout board Lilygo specifically made for the LNURLPoS!
- Any 3.7V lithium iron flat battery with 1.25mm JST connector should be fine. Go for at least 1000 mAh. If you want the battery to fit inside the breakout board, max. dimensions are 40x52x11mm. Example 1100 mAh 3.7V battery.
Software installation:
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Install Arduino IDE 1.8.19
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Install ESP32 boards, using boards manager
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Role back ESP32 boards to 2.0.1 in boards manager
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Download this repo
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Copy these libraries into your Arduino install "libraries" folder
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Open this LNPoSTdisplay.ino file in the Arduino IDE
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Select "TTGO-LoRa32-OLED-V1" from tools>board
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Upload to device
Press/hold any button on the keypad during startup to launch portal. Default password is "ToTheMoon1" (without the quotes)
Note: If using MacOS, you will need the CP210x USB to UART Bridge VCP Drivers available here https://www.silabs.com/developers/usb-to-uart-bridge-vcp-drivers If you are using MacOS Big Sur or an Mac with M1 chip, you might encounter the issue
A fatal error occurred: Failed to write to target RAM (result was 0107), this is related to the chipsest used by TTGO, you can find the correct driver and more info in this GitHub issue