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Main > Sensor modules > Communication  > Adafruit TCA8418 Keypad Matrix Driver and GPIO Expander

Adafruit TCA8418 Keypad Matrix Driver and GPIO Expander

This board has 18 total 'I/O' pins, 10 columns and 8 rows, which can be arranged as a matrix of buttons for a total of 80 switches. Or you can use any subset as individual GPIO input or outputs. The nicest part of the keypad driver is that it has a 10-element event FIFO queue. Since it's I2C (StemmaQT/Qwiic/EasyC compatible) it's very easy to use with any microcontroller or computer.

Product Id: 12649
Your Price: €9.50
Shipping Weight: 15 g
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This keypad has 4 buttons, and since every key has its own wire line, no matrix code is required - just treat these like every day switches. The membrane is soft and has a removable paper backing to expose a strong adhesive so you can stick this on an enclosure.
ID: 11627   Your Price: €2.50
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Simple 3x4 membrane keypad with 7-pin dupont connector and self-adhesive back. Max rating 35 VDC, 100 mA, dimensions: 68.9 x 76 x 0.8mm, with 85 mm cable.
ID: 11565   Your Price: €3.00
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Simple 4x4 membrane keypad with 8-pin dupont connector and self-adhesive back. Max rating 35 VDC, 100 mA.
ID: 11566   Your Price: €3.00
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Simple 4x5 membrane keypad with 9-pin dupont connector and self-adhesive back. Max rating 35 VDC, 100 mA.
ID: 12581   Your Price: €3.50
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Brand: Adafruit
Adafruit NeoKey 1x4 QT I2C breakout fits four Cherry MX or compatible switches and make it easy to use with a breadboard/perfboard or with a STEMMA QT (Qwiic) connector for instant I2C connectivity on any platform. A microcontroller is required to drive this board, it isn't stand-alone. Keys & keycaps are not included: you can use any MX-compatible switch.
ID: 12552   Your Price: €15.60
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This multiplexer module allows you to add up to 16 input/output analog or digital channels to your project. You can even use it for multichannel TX/RX communication. It supports 2-6V power and logic, so it's easy to use it with Arduino, Raspberry Pi or ESP microcontrollers.
ID: 12590   Your Price: €1.80
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Brand: Soldered (e-radionica)
Are you short on IO pins? Looking to increase the number of them? That’s what the GPIO Expander MCP23017 is for! It uses I2C communication to do so. With just two wires, 16 new fully configurable digital IO pins are added to a microcontroller.
ID: 12254   Your Price: €5.20
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Brand: Adafruit
This board comes pre-programmed with seesaw peripheral code that will let it act as an "I2C to something" converter. It has 12x GPIO, 9x 10-bit ADC, 5x 8-bit PWM, 1x NeoPixel output, 1x interrupt, 1x LED, 127 byte EEPROM and two StemmaQT/Qwiic/EasyC I2C connectors. Works with 2-5 V power/logic.
ID: 12647   Your Price: €7.90
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Brand: Adafruit
Finally, a way to get up to 4 same-address I2C devices hooked up to one microcontroller - this multiplexer acts as a gatekeeper, shuttling the commands to the selected I2C port with your command. Using it is fairly straight-forward: the multiplexer itself is on I2C address 0x70 (but can be adjusted from 0x70 to 0x77 using jumpers on the back) and you simply write a single byte with the desired multiplexed output number to that port.
ID: 12648   Your Price: €6.40
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Brand: Soldered (e-radionica)
easyC is the system for simple connection of microcontroller boards, sensors, and actuators, based on the I2C communication and compatible with SparkFun's Qwiic system. This cable has easyC connectors on both ends, and it's 50 cm long.
ID: 11735   Your Price: €1.75
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Brand: Soldered (e-radionica)
easyC is the system for simple connection of microcontroller boards, sensors, and actuators, based on the I2C communication and compatible with SparkFun's Qwiic system. This cable has easyC connectors on both ends, and it's 100 cm long.
ID: 11736   Your Price: €2.40
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Brand: Soldered (e-radionica)
This easyC cable exposes all the pins on the easyC connector. Using this cable, any easyC board can be connected to an experimental board or vice versa. Wires: bllack GND, red 3.3V, blue SDA, yellow SCL.
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