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January 20, 2015 AT 2:53 pm

NEW TUTORIAL: USB Foot Switch

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NEW TUTORIAL: USB Foot Switch

Adafruit carries a lovely foot switch which has a single pole-double throw switch inside. The switch can activate a number of items including an alarm or powerswitch tail to control your world.

A much-requested project by Adafruit customers is using the foot switch to interface with a PC via universal serial bus (USB). To get a switch activation to talk to the USB bus takes a controller – some smarts.

Adafruit’s ATtiny85 based Trinket is low cost and contains enough smarts to perform USB communication (via some smart library software).

Only three parts are required. The foot switch, a USB A to Mini-B cable, and a Trinket 5V. The entire project costs less than $20. And it takes less than an hour’s work.

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The wiring is shown above. The existing foot switch wires are cut short and two connected to Trinket pins #0 and GND (ground). When the foot switch is activated, the switch contact pair that creates a short connects Pin #0 with ground. When the Trinket detects the pin connected to ground, it outputs one or more characters as a PC keyboard.

The Trinket Keyboard tutorial states a Trinket 5V should be used due to the microcontroller clock rate the library uses.

See the full tutorial here!


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