// Turn all OFF digitalWrite(RELAY1, LOW); digitalWrite(RELAY2, LOW); digitalWrite(RELAY3, LOW); digitalWrite(RELAY4, LOW);
: High-quality libraries include status LEDs for each relay that light up during simulation when a channel is active. 4 channel relay module library for proteus new
. Users had to add an NPN transistor (like the BC547) and a 1N4007 diode to protect the microcontroller from back-EMF, just as they would on a breadboard. The "Module" Breakthrough // Turn all OFF digitalWrite(RELAY1