https://github.com/meyskens/coffeebucks
Expensive coffee at home experiment
https://github.com/meyskens/coffeebucks
Last synced: about 1 month ago
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Expensive coffee at home experiment
- Host: GitHub
- URL: https://github.com/meyskens/coffeebucks
- Owner: meyskens
- License: mit
- Created: 2020-12-20T15:32:01.000Z (over 4 years ago)
- Default Branch: main
- Last Pushed: 2020-12-20T16:36:52.000Z (over 4 years ago)
- Last Synced: 2025-01-22T05:17:26.755Z (3 months ago)
- Language: C++
- Size: 8.79 KB
- Stars: 1
- Watchers: 2
- Forks: 0
- Open Issues: 0
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Metadata Files:
- Readme: README.md
- License: LICENSE
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README
# Coffeebucks - pay off that coffee machine
This project started when I invested in a quite expensive coffee machine for my home. I took the amount out of my savings account as an investment.
Then I wondered, how long would it take to pay it back to myself if I were to pay Starbucks prices for my coffees every day.
[Demo](https://twitter.com/MaartjeME/status/1340697330639654912?s=20)
This project uses [Bunq](https://bunq.com/invite/Maartje) and an ESP32 (with giant button for fun!) to pay myself 2 euros every time I drink a coffee.
Due to the quite important part of having a good TLS stack (and lack of a good C library) I added a backend service in Go that does the actual transaction. This code is in Go and in `backend/`
## Hardware setup
I used an Adafruit Feather ESP32, which has a Cherry switch connected from A0 to GND. For fun it is inside a [3D printed panic button](https://www.thingiverse.com/thing:1406545). The ESP32 is setup to go into deepsleep and has an interupt when A0 goes low to connect to the WiFi and call the backend to make a payement.