The I2C 4RO module has four SRD-05VDC-SL-C relays.


Rated resistive load: 7A at a voltage of 240 VAC or 28 VDC. Contact form - SPDT. The galvanic isolation is individual. The dielectric strength of the insulation is 1,5 kV AC (for one minute between the coil and the contacts) and 1 kV AC (for one minute between the contacts of the same polarity).

There is an indication of the status of relays.


The I2C 4RO module is controlled via the I2C interface using the MCP23008 chip. An alternative control method is directly via signals via an auxiliary connector. These control methods allow you to use the module with almost any type of microcontroller. Compatible with Raspberry, Arduino, Nucleo, Adafruit, Teensy and more.


The I2C 4RO module size 65 x 56 mm. The format of the module corresponds to the popular format of the Raspberry Pi 3A+, which greatly simplifies its use with the Raspberry Pi.


The main areas of application of the I2C 4RO module:

  • Industrial Relay
  • Equipment
  • Data acquisition systems (DAS) and PLC
  • DC motor control
  • Consumer electronics and devices
  • Smart home
  • Lighting
  • Power On / Off
  • Heating, Ventilation, & Air Conditioning (HVAC)


  • 4 relays

This product can be bought in Tindie