coffee-scales
![Build Status](https://fyhn.semaphoreci.com/badges/coffee-scales/branches/master.svg?key=bdad7781-738b-46c5-95e4-85f3478b0b54)
Kitchen scales, built for drip coffee brewing:
- 0.1 gram precision
- Very quick response
- Very quick tare
- Auto-starting brew timer
- Auto-off after 5 minutes
Current prototype looks something like this:
![A breadboard prototype in action](https://i.imgur.com/sJAW9rS.jpg)
Build
To build and upload the code:
- Install PlatformIO Core and shell commands
pio run -t upload
Log data
Run
pio run -e logging -t upload && pio device monitor --quiet | tee logs/log.csv
This will log to your screen and to a file logs/log.csv
🪵
Hardware
- Adafruit Feather 328P
- Load cell: 1 kg straight bar
- HX711 load cell amplifier
- Two 4-digit 7-segment displays with TM1637 drivers
- LiPo battery (1200 mAh)
- Push button for taring
![Connection diagram](https://i.imgur.com/zfTGbLD.png)