I’ve been working on a new watch recently. It uses the the Trinket Pro to control everything, as well as the RTC from Adafruit. It uses a potentiometer under the OLED screen and a momentary button to control the watch. But what I think is the best part is on the right. There are female headers that allow me to connect multiple “modules” to it, like the LED shown in the picture. So far, I have a white LED, a black light LED, and a switch I don’t know that name of (used to play Pong on my watch). I intend to add a Tv-Be-Gone, an XBee (once I figure out how to use it), an accelerometer, and some analog sensors.
He is seeking input on ideas for more modules– leave your suggestions in the comments!
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It might be too big, but a GPS module might be interesting to log how far you’ve traveled in a day……combine that with an altitude sensor and you might be able to calculate a rough estimate of calories burned or distance traveled….