YOU WILL NEED THIS BOARD

Serial Pi Plus
RS232 Serial Port development board for the Raspberry Pi and Single-Board Computers
£8.79 ex VAT
The Serial Pi Plus and Serial Pi Zero are communication boards supporting the RS232 serial protocol, designed for use on the Raspberry Pi and other compatible single-board computers.
If you’re looking to add a full RS-232 serial port interface to your Raspberry Pi setup then check out our Serial Pi Plus board which provides a DB9 connector and MAX3232 interface.
This knowledge base section contains articles and tutorials on the Serial Pi, showing how to use the development boards.
Also useful for your Raspberry Pi project
Temperature & Sensing
1 Wire Pi Plus
Connect dozens of 1-Wire sensors - temperature, iButtons, EEPROMs - via a single GPIO pin. Stacks directly on the 40-pin header.
Analogue I/O
ADC Pi
Read up to 8 analogue inputs - perfect for pairing with your temperature sensors or other analogue-output devices.
All-in-one
Expander Pi
Combines ADC, DAC, 32 GPIO ports and a real-time clock on one board. The most versatile board for complex Raspberry Pi projects.