The **M5TS-31-R/BL** is a high-performance, illuminated **Tactile Switch** (Tact Switch) commonly used in control panels, automotive interfaces, and consumer electronics. It is part of a series known for its compact surface-mount design and integrated LED feedback. --- ### ## 1. Technical Specifications Below are the primary electrical and physical characteristics of the M5TS-31-R/BL: | Parameter | Specification | | :--- | :--- | | **Switch Type** | Momentary Tactile Switch | | **Mounting Type** | Surface Mount (SMT/SMD) | | **Circuit** | SPST-NO (Single Pole Single Throw, Normally Open) | | **Illumination Color** | Red (R) / Blue (BL) Dual-Color or Bi-color option | | **Operating Force** | Typically 160gf to 250gf (Standard tactile feel) | | **Contact Rating** | 50mA @ 12V DC | | **Travel Distance** | ~0.25mm | | **Operating Life** | 100,000 to 500,000 cycles | --- ### ## 2. Pin Configuration and Internal Logic The device typically features a 4-pin or 6-pin layout to accommodate both the mechanical switch and the LED anode/cathode connections. * **Switch Pins:** Two pins provide the contact closure when the button is pressed. * **LED Pins:** Dedicated pins for the Red and Blue LEDs. Depending on the specific wiring, these may share a common cathode or anode. ### ## 3. Key Electronic Features * **Dual-Color LED Integration:** The "R/BL" suffix indicates Red and Blue illumination. This allows for status signaling (e.g., Red for "Off/Error" and Blue for "On/Active"). * **Tactile Feedback:** Engineered with a metal dome contact that provides a "clicky" physical sensation to the user, ensuring the press was registered. * **Low Contact Resistance:** Usually below 100mΩ, ensuring reliable signal transmission to microcontrollers (MCUs). * **SMD Design:** Designed for automated "pick and place" assembly and reflow soldering. ### ## 4. Application Example (Code Snippet) If connecting this switch to an Arduino or ESP32, you would typically treat the switch as a digital input with a pull-up resistor and the LEDs as PWM outputs. ```cpp // Example: Basic logic for M5TS-31-R/BL const int SWITCH_PIN = 2; const int RED_LED = 3; const int BLUE_LED = 4; void setup() { pinMode(SWITCH_PIN, INPUT_PULLUP); pinMode(RED_LED, OUTPUT); pinMode(BLUE_LED, OUTPUT); } void loop() { bool isPressed = digitalRead(SWITCH_PIN) == LOW; if (isPressed) { digitalWrite(BLUE_LED, HIGH); // Light Blue when pressed digitalWrite(RED_LED, LOW); } else { digitalWrite(BLUE_LED, LOW); digitalWrite(RED_LED, HIGH); // Light Red when idle } } ``` ---