I2C Relay Module
I2C-controlled relay for switching AC/DC loads up to 5.5A at 240VAC. Enables control of external devices.
Say it to PAL
“Switch it on for 5 seconds, then off.”
The code PAL writes
p.write('qwiic-relay', 'on', {});
await p.sleep(5000);
p.write('qwiic-relay', 'off', {});“Press the doorbell for me.”
The code PAL writes
p.write('qwiic-relay', 'on', {});
await p.sleep(500);
p.write('qwiic-relay', 'off', {});
p.log('Doorbell pressed');When to pick it
The default choice for switching mains-powered devices (lamps, pumps, fans, heaters) — rated up to 5.5A at 240VAC. Choose Modulino Opto Relay for galvanic isolation or Modulino Latch Relay for power-loss state persistence.
Good to know
- Clicks audibly when switching — not suitable for noise-sensitive environments or rapid on/off cycling.
- Do not toggle faster than once per second — mechanical contacts wear out and may weld.
- Max rating is 5.5A at 240VAC — exceeding this can damage the relay or cause a fire hazard.
About it
A single-pole single-throw (SPST) relay controlled via I2C. Can switch both AC and DC loads up to 5.5A at 240VAC or 30VDC. Suitable for controlling lights, fans, pumps, heaters, and other electrical loads. Provides electrical isolation between the control circuit and the load.
Where to buy
Facts
Tested
We connected it to a Raspberry Pi, read it over its real connection, checked that it gives accurate readings through Palpable, and signed it off.
I2C address
The I2C Relay Module answers at I2C address 0x18. Its address can be changed in software.
Current
30 mA
The catalog lists a typical draw of 30 mA for the Relay, copied from the maker’s description and not measured by Palpable.
Board size
25.4 × 57.15 mm
The Relay board measures 25.4 × 57.15 mm and stands 20.6 mm tall with its parts. It has 4 mounting holes. These dimensions are from the maker’s mechanical drawing.
Chips
ATtiny85, G5LE-1
Its microcontroller is the Microchip ATtiny85. Its actuator is the Omron G5LE-1.
ATtiny85 datasheetG5LE-1 datasheetFree to reuse
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This record was last changed on October 13, 2026.