Author Topic: Conecting a Switch to a MCU  (Read 1337 times)

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Offline Joker94Topic starter

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Conecting a Switch to a MCU
« on: December 23, 2009, 07:16:52 PM »
Hi everyone

I want to use a switch to start a program. And i have a few questions.

1)Does it have to be a momentary push button or can it be a toggle

2) how would i go about connecting it to the mcu pin, eg. can i use a sensor bus pin, what do the 2 terminals connect to etc.

all help greatly appreciated

Joker94
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Offline Razor Concepts

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Re: Conecting a Switch to a MCU
« Reply #1 on: December 23, 2009, 07:37:15 PM »
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Offline SmAsH

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Re: Conecting a Switch to a MCU
« Reply #2 on: December 23, 2009, 07:44:45 PM »
One terminal connects to +5v, other to the pin. In between the mcu pin and the terminal, a 10k resistor to gnd.
The switch can be either, the program can be changed to cope.
« Last Edit: December 23, 2009, 07:46:10 PM by SmAsH »
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Offline madsci1016

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Re: Conecting a Switch to a MCU
« Reply #3 on: December 28, 2009, 10:06:54 PM »
Quote from: SmAsH on December 23, 2009, 07:44:45 PM
One terminal connects to +5v, other to the pin. In between the mcu pin and the terminal, a 10k resistor to gnd.
The switch can be either, the program can be changed to cope.

To simply further, just connect the 2 terminals of the switch, one to the pin, one to ground, and enable the internal pull-ups of the Micro controller. This eliminates the need for an external resistor.
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Offline Joker94Topic starter

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Re: Conecting a Switch to a MCU
« Reply #4 on: December 28, 2009, 10:13:29 PM »
brilliant thanks madsci1016

Joker94
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