Pin Connections on the interface board

I wanted to create a board that offered as many different connections as possible. I like to create small robot models and it was really important to offer connections for H-bridges, stepper motors and a whole collection of servos. Sensors are either analogue or digital, and most of them require some sort of power connection.

As a result of all of these decisions, I’ve decided to make the connections based on the pattern set by servo connectors. On these, the centre connection is the positive (+V or Vcc) power supply, one connection is Ground (Gnd) and the final connection is the control signal. On this board, all of the connections face towards the Raspberry Pi Pico.

The pin allocations are based on those given for Microblocks running on the Raspberry Pi Pico at: https://wiki.microblocks.fun/boards/special_pins

Connection diagram for the Raspberry Pi Pico Interface Board
External Pins (Some pins can suit a variety of functions).Used For:
Pins 0-22Digital I/O only (2,3,6,7,8,9 in use for on-board functions)
Pins 0,1Serial UART : Pin 0 – TX Pin 1 – RX
Pins 4,5I2C : Pin 4 – SDA Pin 5 – SCL
Pin 10,11Suitable for an ultrasonic sensor or general I/O use.
Pins 12-19are suitable for servos and have 5v Power Available.
Pins 14-17are also available on the back for connection to a dual H-Bridge for DC motors or Bipolar/Unipolar Stepper Motor driver. A 5V Power Supply is available.
Pins 16-19SPI Pin 16 – SPI MISO Pin 17 – SPI SS Pin 18 – SPI Clock Pin 19 – SPI MOSI
Pins 20-22Digital I/O with 3.3v Power Supply
Pins 26-28Analog or digital inputs with 3.3v Power Supply
Internal Pins
Pin 23(digital output) turn on for better voltage regulation (uses a bit more power)
Pin 24(digital input) detects USB connected
Pin 25(digital output) user LED
Pin 29(analog input) temperature sensor
On-board components
Pin 2 and Pin 3On-board LEDs
Pin 6,7,8,9Tactile Switches
Pin 4,5I2C OLED Display connected to Pin 4 – SDA Pin 5 – SCL and running from 3.3v
Pin Connection List

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