A module with four relays on board.
This version works on 5V. The input works on 0V and 5V (Active low).
The relay therefore switches if there is a 0V signal on the input ("IN") and does nothing (not switched) with a signal of 5V.
Specifications:
Voltage (control): 5V DC
Current per relay (when switched on): ~70mA (~240mA total)
Maximum voltage through relay: 250V AC or 30V DC
Maximum current through relay: 10A (up to 240V AC) or 10A (up to 28V DC)
Connecting to the Arduino:
Connect the GND to the GND of the Arduino
Connect the Vcc to the 5V of the Arduino
Connect the IN pin with the desired pin on the Arduino to control the relay
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