bitcoinVend

Offline bitcoin vending machine

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bitcoinVend is the next logic step after <a href="https://github.com/arcbtc/LNURLPoS">LNURLPoS</a> <-- go to that repo to learn more about the concepts behind bitcoinVend.

Demo video

https://twitter.com/arcbtc/status/1470541850566090757

Tutorial video

<a href="https://www.youtube.com/watch?v=Fg0UuuzsYXc&list=PLPj3KCksGbSYcLQoQbRGAtuHnQ4U4mXeL&index=38" target="_blank" ><img style="width:500px" src="https://user-images.githubusercontent.com/33088785/146017455-5cda5ad7-ba7a-490b-8362-919102bde948.png"></a>

Hardware

• Vending Machine. I use this excellent <a href="https://www.aliexpress.com/item/1005003681521257.html">vending machine</a> 🤩 (USE THIS PROMO CODE TO SAVE $45 VSFPCZIIPKTM)
• ESP32 DEV MODULE
• 12V to 5V Converter USB,3A
• male/male, female/female, male/female jumper wires
• Keypad membrane
• 1.4inch TFT ST7735
• 12v battery (optional)
• Wide breadboard (I used x2 normal breadboards stuck together)
• 4 Channel Relay Module
• Single relay module

Keypad membrane GPIO map: 12-> 32, last row (A,B,C,D) GND

TFT GPIO map: [VCC - 5V (on the single relay), GND - GND, CS - GPIO5, Reset - GPIO16, AO (DC) - GPI17, SDA (MOSI) - GPIO23, SCK - GPIO18, LED - 3.3V (on the single relay)]

Software

Arduino software install

• Download/install latest <a href="https://www.arduino.cc/en/software">Arduino IDE</a>
• Install ESP32 boards, using <a href="https://docs.espressif.com/projects/arduino-esp32/en/latest/installing.html#installing-using-boards-manager">boards manager</a>
• Copy <a href="https://github.com/arcbtc/LNURLVend/tree/main/libraries">these libraries</a> into your Arduino IDE library folder
• Plug in ESP32. From Tools>Board>ESP32 Boards select ESP32 DEV MODULE

Note: You may need to roll your ESP32 boards back to an earlier version in the Arduino IDE, by using tools>boards>boards manager, searching for esp. I use v1.0.5(rc6), and have also used v1.0.4 which worked.

LNbits extension

To make things easy (usually a few clicks on things like Raspiblitz), there is an <a href="https://github.com/lnbits/lnbits/tree/master/lnbits/extensions/lnurlpos">LNbits extension</a>. If you want to make your own stand-alone server software that would be fairly easy to do, by replicating the lnurl.py file in the extension.

Future updates

Looking forward to seeing this same project being used in a range of vending machines, all shapes and sizes.