KY-036 Metal Touch Sensor switch Module

The Metal Touch Sensor Module is equipped with a KRS13 Darlington NPN transistor and features a circuit that includes the LM393 integrated circuit with two comparators. This module is designed to detect human touch on a metal surface. Here are the key features and functionalities:

**Key Features:**

1. **Transistor Configuration:**
– Utilizes a KRS13 Darlington NPN transistor in its configuration.

2. **LM393 Integration:**
– The main chip used is the LM393, which is a dual voltage comparator. The LM393 is part of the circuit and includes two comparators.

3. **Signal Amplification:**
– When the bare wire, acting as the base of the transistor, is touched, a 50 Hz signal present in the surroundings is injected into a high-gain amplifier.

4. **Signal Conversion:**
– The output of the amplifier is connected to a comparator, where the sinusoidal AC signal is converted to a square wave.

5. **Adjustable Sensitivity:**
– The sensitivity of the module can be adjusted by manipulating the VR1 trimmer. This allows users to fine-tune the sensor based on their specific requirements.

6. **LED Indicator:**
– The module includes an LED indicator. When closely observed, a slight flicker in the LED is visible due to the output being a square wave of 50 Hz rather than a constant value.

**Specifications:**

1. **Working Voltage:**
– Operates on DC 5V, making it suitable for various electronic applications.

2. **Single-Channel Signal Output:**
– Provides a single-channel signal output, allowing for straightforward integration into different circuits or systems.

3. **Low-Level Output Signal:**
– The low-level output signal is used for human body touch sensor alarms, making it applicable for touch-sensitive applications.

4. **Adjustable Sensitivity:**
– The sensitivity of the module can be adjusted to accommodate different touch levels and environmental conditions.

5. **Pin Connector:**
– Equipped with a 4-pin connector for easy interfacing with other electronic components or microcontroller boards.

**Applications:**

– Human touch detection on metal surfaces
– Touch sensor alarms
– Interactive electronic projects
– Security systems

Overall, the Metal Touch Sensor Module is a versatile component for detecting touch on metal surfaces, and its adjustable sensitivity makes it suitable for various applications where touch sensing is required.