The KY-004 Tactile Switch Module is designed with sensitivity and precision in mind, enabling highly responsive control over various operations. Its 3-pin, 1-position configuration ensures both stable performance and reliable electrical contact. With a dielectric strength of AC250V, it offers robust protection against electrical surges, enhancing its durability and safety in diverse applications. The switchboard features an advanced anti-interference circuit, thoroughly tested through repeated debugging to minimize disruptions and ensure smooth operation. Its large heat dissipation area contributes to effective thermal management, making it practical for demanding tasks and extending its operational lifespan. Compact and lightweight, the switchboard is ideal for DIY projects, providing ease of installation and integration. The use of high-quality components guarantees strong functionality and stable performance, while its compatibility with various systems enhances its versatility. This thoughtful design improves overall work efficiency and offers a reliable solution for both amateur and professional users. Demo source code for Arduino: int led = 13; // Define LED on Arduino interface int signal = 3; // Define KY-004 module interface int val; // Define a numeric (boolean) variable val void setup() { pinMode(led,OUTPUT); // Set Arduino LED pin as output pinMode(signal,INPUT); // Set KY-004 module signal pin as input } // Start the main program loop void loop() { val = digitalRead(signal); // Read the KY-004 key switch module if(val==HIGH) // If the button is pressed, turn LED ON { digitalWrite(led,HIGH); } else { digitalWrite(led,LOW); } } Features: Type: Push Button Key Switch Max Operating Force: 180/230(±20gf) Durability: 100,000 cycles Operating Voltage: 3.0V to 5.5V Temperature Measurement Range: -55°C to 125°C Measurement Accuracy: ±0.5°C Board Dimensions: 18.5mm x 15mm Package Included: 1 x KY-004 Tactile Switch Module Related