2-Relay Module, Opto-isolated
This dual-channel relay module features opto-isolation between the control-signal voltage and the relay coil supply (common ground).
While the module always requires +5V DC (Vccjd) to operate the relays, the control signal voltage (Vcc) can be anywhere between 3 to 5 VDC (i.e. most microcontrollers, including Arduinos). The control signals can be connected to a microcontroller GPIO or to e an open-collector output because the control signal is active low, meaning that the relay will be energized when the control signal is grounded (i.e. inverted logic). If the control signal for a given channel is floating (or at the control signal voltage), the relay is de-energized.
An on-board LED for each channel indicates the channel status
- Channels: 2
- Contacts: SPCO
- Voltage: 5 V
