IoT Visitor Counter
Two ultrasonic sensors in a doorway, an Arduino working out which way you walked, and a NodeMCU putting the room’s occupancy on the internet.
Arduino · NodeMCU · HC-SR04 · Adafruit IO
2projects · all work
Two ultrasonic sensors in a doorway, an Arduino working out which way you walked, and a NodeMCU putting the room’s occupancy on the internet.
Arduino · NodeMCU · HC-SR04 · Adafruit IO
A differential-drive racing bot driven from a phone, on a motor driver board I laid out myself because the ready-made one was the wrong shape.
ATTINY2313A · L293D · Eagle · Bluetooth