XM-M131 Light Sensor Module

In the field of modern technology, sensors play a crucial role in bridging the gap between the digital and physical worlds. One such innovative component is the XM-M131 Light Sensor Module. This compact yet powerful module is designed to capture ambient light levels and convert them into electrical signals, opening up a wide array of applications across industries. In this article, we'll delve into the key uses, pin outputs, and specifications of the XM-M131 Light Sensor Module.

Dimensions of XH-M131

Below image shows the outer dimensions of the module XH-M131

Top side and bottom side view

Connection diagram of XH-M131

Specifications of XH-M131

• Model: XH-M131 / FC-13-PR / analog
• Power supply: 5V DC
• Current consumption: up to 70mA
• Adjustable switching threshold
• Control element: photosensitive photoresistor
• Controller: LM393 comparator
• Relay: SDR-05VDC-SL-C
• Relay type: electromechanical
• Number of channels: 1
• Switching voltage: up to 250V AC, up to 30V DC
• Rated load current
  • variable AC: up to 5A
  • constant DC: up to 7A
  • peak short-term: 10A
• LED indication: relay actuation, power supply
• Mounting holes: 4 x ⌀2.0mm
• Dimensions: 50 x 26 x 17mm
• Operating temperature: -30°C ~ +70°C
• Weight: 17g

Module internal diagram of XH-M131

Working of XH-M131

This XH-M131 module comprises an opamp comparator at its heart. The main input to the opamp is the variable voltage generated with the LDR according to the light intensity. This variying intensity produces a voltage across the voltage divider formed with the LDR and the resistor R2. This voltage is continuously compared with the fixed reference voltage set by the potentiometer P103. As soon as the light intensity is such that the voltage generated is greater than the reference voltage, the output of the opamp goes high and the relays is switched on.

The on off point can be changed by changing the position of the potentiometer.