Lightninig Piggy - Alby Proof of Concept

Bitcoin Lightning piggybank using Alby API running on TTGO LilyGo T5 ePaper 2.13 inch DEPG0213BN display ePaper hardware with ESP32 microcontroller.

See https://www.lightningpiggy.com/ and https://makers.bolt.fun/project/lightningpiggy

Main Source code

Tested with:

• Arduino IDE version 1.8.13
• ESP32 Board Support version 2.0.14
• Preferences -> Compiler warnings: Default
• Tools -> Board -> ESP32 Arduino -> ESP32 Dev Module
• Tools -> Upload Speed: 921600
• Tools -> CPU Frequency: 240Mhz
• Tools -> Flash Frequency: 80Mhz
• Tools -> Flash Mode: QIO
• Tools -> Flash Size: 4MB (32Mb)
• Tools -> Partition Scheme: Default 4MB with spiffs (1.2MB APP, 1.5MB SPIFFS)
• Tools -> Core Debug Level: Warn
• Tools -> PSRAM: Disabled
• Tools -> Port: /dev/ttyACM0

Make sure the Arduino IDE has permissions to access the serial port:

sudo chmod -f 777 /dev/ttyACM* /dev/ttyUSB*

Make sure the following Arduino libraries are installed

• GxEPD by Jean-Marc Zingg
• ArduinoJson by Benoît Blanchon

On the Alby developer page: Request a new API key by https://getalby.com/developer/access_tokens/new

• Give permissions for account:read, invoices:read, balance:read
• Copy Your Access Token and paste it in the YOUR_ALBY_API_KEY_HERE setting

Todo

• Convert LNURLP to Bech32
• Show QR code of LNURLP
• Merge with lightning piggy core code