Build a DIY thief alarm with NodeMCU 8266 and an ultrasonic sensor. Secure your space easily with our step-by-step tutorial.



Code-https://drive.google.com/file/d/1X9XA...

Connection-
TRIGER PIN-D2
ECHO PIN- D3
GND-GND
VCC-5v (external)
Buzzer PIN- D1
Buzzer Gnd-GND

#diy #iot #alarm #homesecurity #nodemcu