This membrane keypad has a single key, but it does have an embedded surface-mount red LED installed. The flex cable is also extra-long, so they can think of a lot of wearable and portable projects that would use this sort of switch and have an LED as feedback (say, to indicate that an action is occuring or the power is on). Since the keypad is soft plastic, it can be sewn with needle and thread.
The back of the pad has a removable paper cover that protects an adhesive backing. You can see how the pins correspond to the LED anode/cathode and button by looking at the photos above.
Adafruit include a 3-pin extra-long header strip so you can plug this into a breadboard with ease.
Membrane LED Keypad + extras (14:05)
- Weight: 1.97g
- Keypad dimensions: 19.05mm / .75" x 34.92mm / 1.37"
- Length of cable + connector: 350mm / 13.77" x 8.24mm / 0.32"
- 5-pin 0.1" pitch connector
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Documentation and Resources:
- All About Electrical Switches
On and Off. It’s the basis for all electronics, from the most sophisticated computer network to a simple circuit. Electronics is all about using one thing, to control another, input and output, on and off. Even the transistors inside modern com...
- Switches, Debouncing and the Arduino
When we boil it down, everyday interactions with electronics are usually limited to controlling stuff with switches. Whether it be turning on the lights, switching on your laptop or turning on the kettle, all examples of how a physical switch works...
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