NEW GUIDE: John Park’s Coffee Detonator @adafruit @johnedgarpark #adafruit
Hey look, it’s a new guide! The Coffee Detonator learning guide shows you how to use a TNT blasting machine to control your coffee grinder. That may seem a tad specific, but in reality this is a general guide to converting a high-voltage AC source to low voltage DC in order to read it with an Arduino-compatible microcontroller. What you do with it from there is up to you!
Use a high-voltage AC power source to trigger a Feather microcontroller-driven coffee grinder. This guide will show you how a magneto, generator, or other AC power source can be safely converted into a small DC signal easily read by an Arduino-compatible microcontroller. Then, the microcontroller can trigger a 120V relay to turn on any appliance!
The blaster starts out producing around 30V AC.
A full-wave bridge rectifier (four cleverly arranged diodes and a capacitor) and a voltage divider (a pair of resistors) bring this down to a lovely, microcontroller friendly ~3VDC to read on an analog pin.
It all fits neatly on a FeatherWing Proto board.
Coffee beans awaiting detonation.
Beautiful, beautiful ground coffee. Mmmm, that smells good.
Make a robot friend with Adafruit’s CRICKIT – A Creative Robotics & Interactive Construction Kit. It’s an add-on to our popular Circuit Playground Express, FEATHER and other platforms to make and program robots with CircuitPython, MakeCode, and Arduino. Start controlling motors, servos, solenoids. You also get signal pins, capacitive touch sensors, a NeoPixel driver and amplified speaker output. It complements & extends your boards so you can still use all the goodies on the microcontroller, now you have a robotics playground as well.