The ITR9608 consists of a phototransistor and an integrated LED. The phototranistors ground needs to get connected to the arduinos ground, the phototransistors signal line to arduinos IO-pin 2 or 3. The integrated LEDs cathode need to get connected to the arduinos ground and the anode to 180 Ohm resistor which is connected to arduinos 5v pin. Note: check the tiny imprint on topside of the ITR9608.
Additional wiring for optional addons as supported since firmware version 2:
a second spinner is also supported by the new firmware. Just add the two ITR9608 for the second spinner analog to the first one, but use IO-pins TX0 and RX1 (instead of 2 and 3)
by connecting IO-pin 7 to ground, the spinner which is connected to TX0 and RX1 will move the X-axis, disconnect pin 7 from ground and the same spinner will move along the Y-axis (changes to the setting will become effective after disconnecting/ reconnecting the USB cable).
by connecting IO-pin 8 to ground, the spinner which is connected to pins 2 and 3 will move the X-axis, disconnect pin 8 from ground and the same spinner will move along the Y-axis (changes to the setting will become effective after disconnecting/ reconnecting the USB cable).
connect some (daisy-chained) NeoPixels to 5v, ground and IO-pin 5 and the NeoPixel at address 0 will become color animated according to the speed of the spinner connected to pins 2 and 3: color fades from blue (no motion) over pink to glowing red (maximum speed). Same color animation for NeoPixel at address 1 according to the speed of the spinner connected to IO-pins TX0 and RX1.
as side effect of supporting two spinners that can be configured for x- and y-axis, it is now also possible to use controller and firmware as input controller for track balls.
Once the firmware is uploaded, the Spinner will be automatically recognized as USB Mouse by any OS that supports that type of hardware.
There are a lot of different Arduino 'flavors' out there. But it must be a version based upon ATmega32U4 (Arduino Pro Micro, Arduino Micro, Arduino Leonardo). Based on that and due to the small form factor, Arduino Pro Micro ist highly recommanded.
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