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The module uses the Songle relay for control, AC voltage max at 250V, AC current max at 10A, DC voltage 30V DC current maximum 10A;
Basically Connecting on high TTL and open or low TTL.
Operating voltage 5V
With fixed bolt hole for easy installation
Power indicator (green), four relay status indicator (red)
VCC connect to 5V
GND connect to GND
1N1-1N8 relay control interface connected MCU’s IO port
Current version added optical coupler, can select either high or low TTL to trigger relay.
1-Channel 5V Relay Module w/ Opto-isolator
Supports high / low level trigger;
Max. load: AC 250V/10A, DC 30V/10A; SMD opto-isolator,
trigger current: 5mA;
Module working voltage: 5V;
Module size: 50mm x 26mm x18.5mm
*note*: The current batch of these relays of 27/11/2017 - The VCC and GND Pins are swapped due to manufacturer error. The Pinouts for these modules from left to right are the following:
1(N/A) - 2(Trigger) - 3(GND) - 4(VCC)