You can enter the Bootloader mode at any time by pressing the button at the end of the Trinket opposite the USB port. During this 10 second window, the Trinket is in Bootloader mode. When first plugged into the computer's USB port, the green LED will come on steady and the red LED will blink for 10 seconds and then go out. The Trinket must be in Bootloader mode in order to upload code to it. Set the Board Type as "Adafruit Trinket 16MHz", and the Programmer as "USBtinyISP". Download and install the Adafruit Trinket libraries, and the volume control code (links in the beginning of the project). A good tip is to further insulate the encoder pins between the shrink tubing and the encoder with a dab of hot glue. The base will later be filled with lead shot, and these pins need to be as insulated as possible because they will be in contact with the shot when finished. Trinket pin GND to encoder's common pin.īe sure to slip a piece of heat shrink tubing over each wire before soldering, and slide it as far over the pin as possible before shrinking it.Trinket pin 5V to the other encoder button pin.Trinket pin #2 to encoder's "B" signal pin.Trinket Pin #1 to one of the encoder's button pins.Trinket Pin #0 to encoder's "A" signal pin.Wire the Trinket to the encoder as follows: This is also shown on the photo of the data sheet.
If you hold the encoder facing the side with the three pins, with the shaft pointing up, the left pin is Signal "A", the center is Common and the right pin is Signal "B". The three pins on the other side are the signal pins. These pins are not polarity sensitive, and there is no difference in how the button wires connect to them. They make contact when the encoder's shaft is pressed. The two pins on the one side are for the button. The rotary encoder has five pins - three on one side, and two on the other.
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