The AB Electronics UK Knowledge Base provides support solutions, tutorials and troubleshooting guides.
YOU WILL NEED THIS BOARD
The IO Pi Plus development board can drive up to 25mA per channel, but to drive higher loads, such as relays or some optoisolators, you will need to boost the output using a transistor or MOSFETs.
The circuit below shows how to operate a 5V coil relay using either a GPIO output from the Raspberry Pi or one of the output pins on the IO Pi and IO Pi Zero boards.
Driving optoisolators with the IO Pi Plus/Zero
Suppose you would like to connect an optoisolator to the IO Pi. In that case, you can remove the relay and protection diode and combine a series resistor in line with the optoisolator in place of the relay.
You can use our LED Calculator to find the correct series resistor for your optoisolator.
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.
Related Articles
- IO Pi Plus FAQ
- IO Pi Plus Tutorial 1 - The Blinking LED
- IO Pi Plus Tutorial 2 - Push the Button
- IO Pi Plus Tutorial 3 - Introducing Interrupts
- IO Pi Plus Tutorial 4 - More Interrupts
- IO Pi Plus Tutorial - MQTT Reading the Ports
- IO Pi Plus with Raspberry Pi Pico
- IO Pi Plus Tutorial - MQTT Control
- Driving Relays or Higher Loads with the IO Pi Plus
- Relay Board for the IO Pi Plus 2.1
- 16 Channel Opto-Isolated Input Board
Order these Boards
IO Zero 32
32 channel digital I/O development board for the Raspberry Pi and Single-Board Computers
£8.79 ex VAT
