Alternate Push Button Input

[HeliconEnt]

Greetings all,

I am trying to determine if there are any alternate pins on the Trinket M0 that can be used for a push button input. The usual pins 0 and 2 in my project are needed for I2C output (SDA/SCL) to an LED Driver IC. I was hoping to be able to integrate a push-button trigger to be able to toggle through lighting sequences. Can I use pin 7 or 8 for that purpose?


Muscle Nerd Jerry

[adafruit_support_carter]

Do you mean physical pins 7 and 8? The ones labeled 4 and 3 on the Trinket?

Yes. They can be used. There are 5 total GPIO pins available on the Trinket M0:
https://learn.adafruit.com/adafruit-tri ... no/pinouts
The I2C pins SDA and SCL only use two of them: 0 and 2. So the other 3 are available for whatever.

[michaelmeissner]

Sure you should be able to use pins 7 or 8 (labeled 3 and 4) for a push button input. Both of these pins are also capable of touch input.

Alternatively, if you are using pins 0 and 1 for I2C, you could put an I2C device on your I2C bus to provide push buttons, such as:

• Neokey 1x4 buttons: https://www.adafruit.com/product/4980
• Arcade LED 1x4 buttons: https://www.adafruit.com/product/5296
• Adafruit 12 x Capacitive Touch Shield for Arduino - https://www.adafruit.com/product/2024
• I2C expander: https://www.adafruit.com/product/5346

For I2C, you would have to make sure that any other I2C devices don't have the same address as the boards above.

[HeliconEnt]

Thanks gang! That's a big load off my mind!

Jerry