Hole diameter: approx 3.2 mm (0.13 in) LM393 universal single supply comparator module provides precision voltage tunability and dual channel outputs. It supports and low level outputs for both channels and is suitable for front end signal acquisition and microcontroller switching. Applications include sensitive temperature sensors, photosensitive sensors, and vibration sensors. How it works Use the reference voltage adjusting potentiometer to generate the reference voltage. Compare the sensor voltage with the reference voltage using the module. The device delivers level or low level outputs for each channel according to the comparison result. Key specifications Input power supply: 4.5 to 28 V Dual channel comparator module based on LM393 Independent channels with adjustable reference Suitable for front end acquisition and single chip switching Usage scenarios Temperature threshold switch: monitor a temperature sensor and trigger a digital signal when a preset temperature is reached, enabling heating or cooling control. Light or photo sensor trigger: detect ambient light levels and activate or deactivate a circuit, such as automatic lighting or an alarm system. Vibration or motion monitoring: use a vibration sensor to detect changes and generate a binary signal for alerting, logging, or control of a connected device. Notes Ensure the supply voltage remains within the 4.5–28 V range for reliable operation. Connect the sensor output and the reference voltage to the appropriate inputs to obtain the desired /low output behavior.