Best Io Modules Deals Online in the UK (25 Deals Found)

Last Updated - 15/12/2025 Sort By:

Best Choice
frient

New
frient IO Module | Input/Output Module | Smart Home Connectivity Module | Smart Home Interface for Wired Devices | Zigbe
Connect your wired devices to your smart home and start controlling them remotely.

£37.64
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Best Value
DollaTek

New
DollaTek 3Pcs PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module
Standard interface that can be expanded in a variety of development boards

£3.99
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New
IO Expansion Module PCF8575 I2C Great for Arduino Raspberry Pi and More
MPN: PCF8575. Interface Type: I2C. Expands the functionality of boards like the Arduino UNO R3. Type: Interface IC. I²C

£3.99
Youmile

New
Youmile 2 pcs PCF8575 IO Expander Board Module I2C to 16IO Module I/O Extension Shield Module 16 bit SMBus I/O Ports wit
【Parameters】: Working voltage: 2.5 - 5.5VDC; Working current: 100mA(MAX); I2C address: 0x20(default), can be modified by

£6.99
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Used
ComAp INTELI IO8/8 BINARY INPUT/OUTPUT MODULE 8-36V DC
MANUFACTURE: ComAp. TYPE: INPUT/OUTPUT MODULE. ONE STOP SOLUTION FOR ALL YOUR MARINE & INDUSTRIAL NEEDS.

£206.39
CRGANGZY

New
CRGANGZY PCF8575 I2C IO Extension Shield Module I2 C To 16IO IIC I2C I/O Extension Shield Module Fit for
Increased I/O Capacity: By leveraging the PCF8575 chip, the IO expander module amplifies the number of available I/O pin

£2.99
GERUI

New
8pcs PCF8574 IO Expander Board I/O Expander I2C Bus Evaluation Development Module PCF8574 Module is Suitable for Arduino
I/O expansion module based on I2C interface, which can extend 8-I/Os with 2-I/Os (up to 8 PCF8574 can be used simultaneo

£7.99
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New
NEW Protec 6000/MICCO Monitored I/O Unit – Loop Powered Interface Module
• Model/Code: Protec 6000/MICCO. • 1 x Protec 6000/MICCO PCB Unit and Enclosure. • Monitored Input: Allows for the conne

£20.23
Hailege

New
Hailege TTP223B Capacitive Touch Switch Module Sensor DC 2~5.5V for Arduino Raspberry Pi
This is the "momentary" variety of the touch sensor - touch and it turns on, release and it turns off.

£6.69
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Used
HP Flex IO v1 DisplayPort Module/Port Add-in Card Adapter
V1 Flex IO DisplayPort module for HP PCs, used and tested working.

£6.52
ALMOCN

New
ALMOCN 4pcs PC817 Board, 1CH Io-Module, 3.6-30V Driver, 1-Channel Isolation, Photoelectric Isolated Module, 3.6-24V Inpu
The PC817 Optocoupler Isolation Board used when it comes to the need for isolation control and voltage conversion.

£9.99
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WINGONEER

New
WINGONEER PCF8574 IO Expansion Board I/O Expander I2C-Bus Evaluation Development Module
Standard interface that can be expanded in a variety of development boards

£2.99 £3.99
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New
PCF8575 I2C IO Expansion Module Great for Arduino, Raspberry Pi and More
PCF8575 I2C IO Expansion Module. On board 3.3V level converter circuit, if you don't solder pad of VCC-VDD, the PCF8575

£3.79
Create idea

New
Create idea 16-ch IO Expansion Pin Module Board I2C Interface IIC Input Output MCP23017-E/SS for Computer Game Console
It is suitable for computer peripherals, game console control, smart home, sensor management, motor control, LED matrix

£9.29
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New
Raspberry Pi Compute Module 4 + Official Raspberry Pi Compute Module IO Board
OfficialRaspberry Pi Compute Module IO Board. Raspberry PiCompute Module 4 — 4GB RAM / 16GB eMMC.

£63.10
Qiterr

New
MRI-24TR/INV NPN PNP Signal Converter PLC Sensor IO Level Conversion Module PNP Signal Converter PLC Sensor Polarity IO
✅【Good Practicality】This NPN PNP signal converter module can convert NPN signal into PNP output, or convert PNP into NPN

£11.06
New
PCF8575 I2C IO Extension Shield Module 16 I/O Port Expander For Arduino
Have you run out of I/O pins?. Onboard 3.3V level converter circuit, if you do not solder VCC-VDD pad, the PCF8575 level

£1.42
New
SN74HC595 8-Bit Shift Register Breakout Board Serial In Parallel Out 74HC595 IO
1x SN74HC595 Breakout Board, Pin Headers. Chaining Supported: Serial out pin allows easy cascading of multiple boards. C

£3.69
New
ISMA-B-40-H-IP IO Modules Controller (BNIB)
The ISMA-B-40-H-IP IO Modules Controller is a high-quality data logger designed for precision data acquisition and loggi

£52.68
Used
Trend BMS IO Modules
The Trend BMS IO Modules are a range of products designed for use in building management systems. Manufactured by the re

£78.70
Used
TREND IQ3 IO BUS MODULES BUNDLE BMS HVAC AUTOMATIC CONTROLS HARDWARE USED
1no 8DO, 3no 16DI, 1no 8AO, 4no 4UI/4AO. a few terminal plugs missing in the photos, but I have spares, so they will all

£51.66
New
MCP23017 16Bit IO Expansion Module IIC Communication For Embeddedly Systems
Driver chip: MCP23017. Module size:about 65x19mm/.2.57x0.76in. Number of I/O port: 16.

£7.44
New
IO Data Slot 1 Upgrade CPU Module PK-733NX Celeron 733
IO Data CPU upgrade for Slot 1 motherboards. Basically, a retail Slotket. Open box, never used.

£150.00
New
Sick FLX3-XTDO100 | 1085354 Flexi Compact safe digital I/O expansion module
Brand new in box, with original seal. The Sick FLX3-XTDO100 is a digital I/O expansion module designed for use with the

£225.00
New
Yanhua Mini ACDP-2 Programming Master Basic Module Wireless For PC/Android/IOS
Yanhua Mini ACDP 2 K-ey Progarmming ACDP-2 Master Basic Module Supports USB and Wireless Connection No Need Soldering. A

£369.00

25 Io Modules deals are available from: Amazon, eBay stores, starting from £1.42.
The biggest discount we found is 10%% on frient IO Module | Input/Output Module | Smart Home Connectivity Module | Smart Home Interface for Wired Devices | Zigbee | Works with Homey, Home Assistant, and SmartThings at Amazon.
The lowest price we found is £1.42 while the highest is £369.00.
Prices for the best Io Modules deals average at £53.73.
Last updated on December 15, 2025.
We scanned these quality online stores and more to deliver you with the best offers online available for Io Modules.