4/15/2023 0 Comments Adafruit trinket 5v fastledThis pin is used for USB programming, but its also an analog input known as Analog A3 GPIO #3 - this is connected to PB3 on the Attiny85. ![]() We didn't want to keep these pins off the board but we strongly recommend not using them unless you're sure you need them since you might have to disconnect any connections to reprogram the Trinket! The best use of these pins is as outputs to things like LEDs. That means that when the Trinket is connected to a computer and in bootloader mode or in the middle of uploading a new program, they are used for sending data to/from the computer! It's possible to share these pins if you are careful. The next 2 pins are also used for USB programming. This pin can be used as an analog input (known as Analog A1), and is also used for I2C clock and SPI clock.
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