TSIR341 – 4 Channel Outputs- 4 optically Isolated Inputs 30A Bluetooth Relay

The TSIR341 provides a four volt free contact relay outputs with a current rating of up to 30Amp each.

It has 4 channel optically isolated inputs, 1 x DS18B20 temperature sensor port, 1 x SHT10 humidity sensor port, and 1 x TEMP6000 light sensor port. The module is powered from a 12V DC supply. The relays are SPST-NO types.

It’s a Bluetooth relay, you can easily control this relay module by your computer or smartphone using Bluetooth. The communication method also can be changed easily. Replace the Bluetooth Bee module with a WiFiBee, it becomes a Wi-Fi relay. It will be a USB relay when you plug a USBBee.

Relay power rating
If the relay is used at a voltage or current exceeding this specification, the life of the contacts may be significantly shortened.

A full datasheet for the relays used on the TSIR341 is here: G8P datasheet

Optically Isolated Inputs

TSIR341 has 4 optically Isolated input ports. Input voltage absolute Max. 30V DC, Operational 4.5V to 27V DC. TSIR341 has 2 working modes:

Normal mode: When the board reads an input signal it recognizes the input state.

Auto mode: When the board reads an input signal it recognizes the input state and turns on the corresponding relay. When the input voltage is removed relay turns off.

The TSIR341 operates with an easy to use command set as described in the table below.

TSIR341 Baud rate: 9600

Test program
To get the TSIR0x up and running in the minimum amount of time we have put together an example program to demonstrate the functionality of the module. We also provide a FREE android App TSIR Bluetooth. You can control your device by your phone very easily.


  • Working voltage: 12V DC
  • Standby Current 10mA/5V DC
  • Relay current rating of up to 30 Amp.
  • Optically isolated inputs
  • Temperature sensor supported
  • Humidity sensor supported
  • Light sensor supported
  • Control distance:25m (outdoor)
  • Support Android: Above V2.2
  • Support iPhone: Above iPhone4