A Microswitch is a very small and sensitive switch which can be activated by a lever arm. This design often suits its use as a contact or collision sensor in robotic and mobile "buggy" applications.

By placing a microswitch in an appropriate circuit and connecting to a PICAXE input pin the PICAXE can determine if the switch is activated or not.

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Microswitch contact detection

The following program looks for microswitch activations on input pin C.0 and counts those activations. When five activations have been counted a LED on output pin B.1 will be set. The 'pause 100' acts as a contact de-bounce; if it is removed contact bouncing may cause the LED to be lit prematurely.

Code Example:
init:	let b0 = 0

main:	if pinC.0 = 1 then add
	goto main

add:	pause 100 		; short delay
	let b0 = b0 + 1
	if b0 < 5 then main
	high B.1
	goto main
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Create Module

A microswitch (and 10k pull down resistor) may be connected to the generic terminal block create module.

Bill of Materials

Miniature SPDT microswitch SEN050 1 Buy Now
10k resistor (pack 100) RES10K 1 Buy Now


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