A38 Touch Sensor Switch Module | DC 3-5V TTL Output for Arduino & DIY
A38 Touch Sensor Switch Module | DC 3-5V TTL Output for Arduino & DIY
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Short Product Description
Short Product Description
Upgrade your mechanical buttons with the A38 Touch Sensor Module. Designed for seamless integration into smart cars, robotics, and home automation, this capacitive touch switch offers a modern, wear-free interface. Featuring a high-precision LM393 operational amplifier, it provides a stable TTL signal output that connects directly to MCU IO ports. Whether you are a STEM educator or a professional developer, the A38 ensures a responsive, anti-interference experience for all your interactive electronic projects.
Key Features
Key Features
- Non-Contact Operation: Eliminates mechanical wear for a significantly longer lifespan.
- Direct MCU Compatibility: Connects directly to Arduino, 8051, or STM32 IO ports without extra logic shifting.
- Real-time LED Feedback: Integrated TTL signal indicator for instant status monitoring.
- Anti-Interference Design: Advanced circuitry ensures stable performance in complex electronic environments.
- Flexible Control: Capable of controlling a single relay module independently for standalone switching.
- Easy Installation: Features four pre-drilled mounting holes for secure attachment to any chassis.
Full Product Description
Full Product Description
Modernize Your Interface with Capacitive Touch Technology
Mechanical switches often suffer from contact bounce and physical wear over time. The A38 Touch Sensor Module solves this by utilizing capacitive sensing, allowing users to trigger actions with a simple tap on the gold-plated induction zone. This module is the perfect bridge between human interaction and digital logic.
Engineered for Stability and Precision
At the heart of the A38 is a robust operational amplifier (LM393) and triode circuit. This configuration ensures that the module maintains a strong anti-interference capability, preventing false triggers caused by environmental noise or electromagnetic interference. It operates on a versatile DC 3-5V range, making it compatible with most standard power rails found in Arduino, Raspberry Pi, and ESP32 ecosystems.
Seamless Integration for Smart Projects
The board is designed with "Plug-and-Play" simplicity in mind. Using standard 2.54mm pitch headers, it fits perfectly into breadboards or jumper wire setups. The onboard TTL level indicator LED provides instant visual feedback, making debugging a breeze during the development phase of your smart car or relay-controlled system.
Technical Specifications
Technical Specifications
- Model: A38 Touch Switch Module
- Operating voltage: DC 3V – 5V
- Main components: LM393 op-amp, triode
- Output signal: TTL level (digital high/low)
- Connector type: 2.54 mm pitch header
- Dimensions: 45 × 18 × 5 mm
- Mounting: 4 × fixed installation holes
Delivery Options
Delivery Options
- Local delivery within Hong Kong and in-store pickup.
- Free shipping for orders of HK$400 or above; HK$35 shipping fee for orders below HK$400.
- Shipped by SF Express, usually dispatched the same day for orders confirmed before 6:00 PM (Mon–Sat).
- Estimated delivery time: 1–3 business days after dispatch (Hong Kong).
- In-store pickup details (location and time) will be confirmed by email or phone message.
- Delivery times are estimates and may be affected by weather or unforeseen circumstances.
FAQ Section
FAQ Section
Q: Can this module work through a plastic or glass enclosure?
A: Yes, as a capacitive sensor, the A38 can often detect touch through thin non-metallic overlays (approx. 1-3mm), though direct contact with the gold pad provides the highest sensitivity.
Q: Is the output momentary or latched?
A: The standard A38 provides a momentary TTL signal output; the signal stays active as long as the touch is detected. Latching behavior can be easily programmed via your MCU code.
Q: Does it require a special library for Arduino?
A: No, it acts as a simple digital input. You can use the standard digitalRead() function to detect touch events.
Target Users / Applications
Target Users / Applications
- STEM Education: Ideal for teaching students about capacitive sensing and digital logic.
- Smart Home Developers: Use it as a hidden wall switch or furniture-integrated toggle.
- Robotics & Smart Cars: Perfect for "Touch to Start" functions or collision detection.
- Industrial Prototyping: A quick solution for adding user input to control panels.
