coffee-scales

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:

Build

To build and upload the code:

1. Install PlatformIO Core and shell commands
2. 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