Datasheet

Here's the ATtiny85 pinout

Power Pins

We'll start with the top pins BAT+ and USB+ and GND

BAT+ is the Battery + Input pin. If you want to power the trinket from a battery or power adapter or solar panel or

any other kind of power source, connect the + (positive) pin here! You can connect up to 16V DC. If you have a

3V Trinket, you'll want at least 3.5V input to get a good 3.3V output. If you have a 5V trinket, 5.5V or higher is

suggested. This input is reverse-polarity protected.

USB+ is the USB + Output pin. If you want to use the USB 5V power for something, like charging a battery, or if

you need more than 150mA of current (this pin can supply 500mA+ from USB ports) or to detect when the

Trinket is plugged into USB, this pin will have 5V power on it if and only if its plugged into something via the mini

B connector

GND is the common ground pin, used for logic and power. It is connected to the USB ground and the power

regulator, etc. This is the pin you'll want to use for any and all ground connections

GPIO Pins

Next we will cover the 5 GPIO (General Purpose Input Ouput) pins! For reference you may want to also check out the

datasheet-reference above for the core ATtiny85 pin

All the GPIO pins can be used as digital inputs, digital outputs, for LEDs, buttons and switches etc. They can provide up

to 20mA of current. Don't connect a motor or other high-power component directly to the pins! Instead, use a transistor

to power the DC motor on/off