Micro Limit Switch (KW10 / 3-pin)
by Generic
SKU: PSA-CMP-LIMIT-SW
No reviews yetTypical India street price
₹10–₹30
End-stop for 3D printers, drawers, robot bumpers.
Interface: NO/NC mechanical
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Concept
A tiny lever switch: COM, NO, NC.
A little theory
INPUT_PULLUP to COM/NO so press = LOW. Hardware debounce optional. In the classroom, treat Micro Limit Switch (KW10 / 3-pin) as a beginner part using NO/NC mechanical. Typical India street price is about ₹10–₹30. Always verify voltage and pin labels on your exact module — silk screens vary across clones. Start with a datasheet or trusted learn guide, power the part correctly, share GND with the MCU, and test with a simple blink/read sketch before building the full project. Measure voltages with a multimeter when something fails, and keep actuator current off the MCU regulator.
How it works in a project
digitalRead; invert as needed.
Classroom & project use
- CNC home
- Bumper robot
- Lid-open alarm
Buying in India
Precautions
- Check 3.3 V MCU compatibility before connecting signal pins
- Share a common GND with the microcontroller
Specifications
| Pins | COM NO NC |
| Category | Sensors |
| Difficulty | Beginner |
| Voltage | 5–250 V contacts (use at 5 V logic) |
| Interface | NO/NC mechanical |
Pinout
See module silkscreen: typically VCC, GND, and signal pins. Confirm labels against the seller photo — clones vary.
