The **GS069** typically refers to a specific model of an **Automatic Hand Sanitizer or Soap Dispenser** circuit assembly. This module is widely used in DIY electronics and commercial touchless hygiene products. ### 1. Core Component Breakdown The system operates on an Infrared (IR) sensing mechanism. Below are the primary electronic components found on the GS069 PCB: | Component | Function | Specification | | :--- | :--- | :--- | | **IR Transmitter** | Emits a beam of infrared light. | 940nm Wavelength | | **IR Receiver** | Detects reflected light from a hand. | Photodiode/Phototransistor | | **Control IC** | Processes the signal and timing. | Logic-based or Microcontroller | | **MOSFET/Transistor** | Acts as a switch to drive the motor. | S8050 or similar NPN/NMOS | | **DC Pump Motor** | Moves the liquid from the tank to the nozzle. | 3V - 6V DC Motor | | **Potentiometer** | Adjusts the sensitivity or volume. | Variable Resistor | --- ### 2. Operational Logic The GS069 circuit follows a standard "Reflective Optical" logic loop: 1. **Emission:** The IR LED continuously or pulses light. 2. **Reflection:** When a hand is placed within 3–10cm, light bounces back. 3. **Detection:** The IR receiver converts the light into a small electrical current. 4. **Amplification:** The internal IC amplifies this signal to trigger the "High" state. 5. **Actuation:** The gate of the MOSFET opens, allowing current to flow from the battery to the pump motor for a predetermined duration (usually 1-2 seconds). --- ### 3. Technical Specifications Common electrical ratings for these modules: * **Operating Voltage:** 4.5V to 6V DC (Typically 4x AAA batteries). * **Standby Current:** < 50µA (Designed for long battery life). * **Induction Distance:** 3cm - 15cm (Adjustable on some versions). * **Load Capacity:** Supports small DC pumps up to 500mA. --- ### 4. Typical Wiring Diagram (Simplified) ```cpp [ Battery + ] ----> [ VCC Pin ] [ Battery - ] ----> [ GND Pin ] [ Motor + ] ----> [ VCC ] [ Motor - ] ----> [ Drain/Collector of MOSFET on PCB ] [ IR Pair ] ----> [ Pre-soldered to Front of PCB ] ``` ---