What is a Seesaw?
It is a way of expanding the input-output capability of a micro-controller via the Integrated Inter Circuit (IIC) interface. Ada fruit have developed a set of boards and drivers which give us a whole load of extra ports. In particular, we are interested in additional analogue inputs. Our favorite Pi Pico micro-controller only has three available inputs, which is not enough for a comprehensive set of white line sensors! – Dr Timothy Davies,
The Specifics
The Adafruit Attiny817 Breakout board is an 8-bit micro-controller with 8KB of flash, 512 bytes of RAM and 128 bites of EEPROM. It has a 3.3 volt regulator and has the ability to communicate with the Raspberry Pi Pico using I2C connectors. It has 14 GPIO pins, nine 10-bit ADC pins, five 8-bit PWM output pins as well as an indicator LED. We plan to use it as an extension which will increase the number of pins available.