2.Relay Control: When the light level falls below a threshold (LDR gives a HIGH output), the relay is turned ON to control a connected load. 3.Serial Monitoring: The Arduino reads the LDR's output ...

Arduino Code to control relays for three heating elements Code developed for FrontiEV electric conversion. Relays driven by Arduino control 80amp relays for each heating element in the VW 12v heater ...

Looking for practical Arduino projects? This guide shows how to control a relay from your smartphone using an Arduino Uno — either via Bluetooth or Wi-Fi.