CircuitPython / Other Devices

They're not displays or sensors, but we have drivers for them too! From shift registers and GPIO expander to thermal printers – we've got a bunch of CircuitPython-compatible Adafruit devices for you to choose from! Every item in this category has a CircuitPython driver ready to go, for fast and easy usage. With a wide and growing range of chips and sensors, this will be a great place to continue checking for more fun accessories for your CircuitPython projects.

MicroSD card breakout board+

Product ID: 254

Not just a simple breakout board, this microSD adapter goes the extra mile - designed for ease of use. Onboard 5v->3v regulator provides 150mA for power-hungry cards. 3v level shifting means you can use this with ease on either 3v or 5v systems. Uses a proper level shifting chip, not resistors: less problems, and faster read/write access. Use 3 or 4 digital pins...

$7.50

In stock

Adafruit DS3231 Precision RTC Breakout

Product ID: 3013

The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal". And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a small, low power package. Most RTCs use an external 32kHz timing crystal that is used to keep time with low current draw. And that's all...

$17.50

In stock

TCA9548A I2C Multiplexer

Product ID: 2717

You just found the perfect I2C sensor, and you want to wire up two or three or more of them to your Arduino when you realize "Uh oh, this chip has a fixed I2C address, and from what I know about I2C, you cannot have two devices with the same address on the same SDA/SCL pins!" Are you out of luck? You would be, if you didn't have this ultra-cool TCA9548A 1-to-8 I2C...

$6.95

In stock

Adafruit PCF8523 Real Time Clock Assembled Breakout Board

Product ID: 3295

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. Equipped with PCF8523 RTC - it can run from 3.3V or 5V power & logic! Works great with an Arduino using our RTC...

$6.95

In stock

Adafruit DS1307 Real Time Clock Assembled Breakout Board

Product ID: 3296

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc. The DS1307 is the most popular RTC - but it requires 5V power to work (although we've used it with 5V power and 3.3V...

$7.50

In stock

Angled shot of a Adafruit Micro SD SPI or SDIO Card Breakout Board.

Adafruit Micro SD SPI or SDIO Card Breakout Board - 3V ONLY!

Product ID: 4682

Micro SD cards and microcontrollers go together like micro-peanutbutter-and-jelly: SD cards are inexpensive, durable, easy to find at any shop, come in many sizes and can plug into any computer using a common SD card reader. That makes them perfect for microcontroller storage and retrieval - whether it's images, fonts, GIFs, audio files, or sensor logs. Wiring up SD...

$3.50

In stock

Adafruit EMC2101 I2C PC Fan Controller and Temperature Sensor - STEMMA QT / Qwiic

Product ID: 4808

Cooling fans...They're everywhere, and they serve the important purpose of keeping things cool, generally electronics. One might rightfully think: "these fans are pretty good at moving air to keep things cool; maybe I can use one of these neat computer fans to keep my widget frosty" followed closely by throwing up one's hands in confusion at the sight of a 3 or even...

$5.50

In stock

Angled shot of clock generator breakout board.

Adafruit Si5351A Clock Generator with STEMMA QT - 8KHz to 160MHz

Product ID: 5640

Never hunt around for another crystal again, with the Si5351A clock generator breakout from Adafruit! This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from optional edge-launch SMA connector for output #1. (If you need SMA-connector outputs for all three ports, check out the non-QT breakout...

$7.95

11 in stock

Angled shot of STEMMA QT level shifter breakout board.

Adafruit QT 5V to 3V Shifter Breakout - STEMMA QT / Qwiic

Product ID: 5637

If you're hankerin' to use the new Qwiic / Stemma QT standard for your next project - but you're still using a classic Arduino UNO or other 5V microcontroller, this board is designed for you! Note that Adafruit QT boards are all 3V and 5V safe but many other Qwiic and other I2C devices are not 5V safe or compatible. That means that if you use wires to connect a Qwiic...

$2.95

In stock

Adafruit 16-Channel 12-bit PWM/Servo Driver with I2C interface

Adafruit 16-Channel 12-bit PWM/Servo Driver - I2C interface - PCA9685

Product ID: 815

You want to make a cool robot, maybe a hexapod walker, or maybe just a piece of art with a lot of moving parts. Or maybe you want to drive a lot of LEDs with precise PWM output. Then you realize that your microcontroller has a limited number of PWM outputs! What now? You could give up OR you could just get this handy PWM and Servo driver breakout. When we saw this...

$14.95

In stock

Angled shot of MCP4725 Breakout Board - 12-Bit DAC w/I2C Interface.

MCP4725 Breakout Board - 12-Bit DAC with I2C Interface - STEMMA QT / qwiic

Product ID: 935

Your microcontroller probably has an ADC (analog -> digital converter) but does it have a DAC (digital -> analog converter)??? Now it can! This breakout board features the easy-to-use MCP4725 12-bit DAC. Control it via I2C and send it the value you want it to output, and the VOUT pin will have it. Great for audio / analog projects, such as when you can't use...

$4.95

In stock

Adafruit AW9523 GPIO Expander and LED Driver Breakout - STEMMA QT / Qwiic

Product ID: 4886

Expand your project possibilities, with the Adafruit AW9523 GPIO Expander and LED Driver Breakout - a cute and powerful I2C expander with a lot of tricks up its sleeve. GPIO expanders work like this: you have a board with some number of GPIO but not enough for your project - maybe you need more buttons or LEDs. You could upgrade to a board with massive number of GPIO...

$4.95

87 in stock

Adafruit PCF8575 I2C 16 GPIO Expander Breakout - STEMMA QT / Qwiic

Product ID: 5611

Expand your project possibilities, with the Adafruit PCF8575 GPIO Expander Breakout - an affordable 16 channel I2C expander. GPIO expanders work like this: you have a board with some number of GPIO but not enough for your project - maybe you need more buttons or LEDs. You could upgrade to a board with massive number of GPIO like the Grand Central, or you could pop on...

$5.95

In stock

Angled shot of a Adafruit RFM95W LoRa Radio Transceiver Breakout.

Adafruit RFM95W LoRa Radio Transceiver Breakout - 868 or 915 MHz - RadioFruit

Product ID: 3072

"You see, wire telegraph is a kind of a very, very long cat. You pull his tail in New York and his head is meowing in Los Angeles. Do you understand this? And radio operates exactly the same way: you send signals here, they receive them there. The only difference is that there is no cat." Sending data over long distances is like magic, and now you can be a magician...

$19.95

In stock

Adafruit LTC4311 I2C Extender / Active Terminator Attached to a 100 foot Ethernet cable on one end. other end of cable goes to a QT Py microcontroller.

Adafruit LTC4311 I2C Extender / Active Terminator - STEMMA QT / Qwiic

Product ID: 4756

I2C stands for Inter-Integrated-Circuit communications, it's meant for short distances on a PCB or subassembly. But, hey, we're engineers, and we like to push the limits of technology, right? So why not try to have I2C run over a meter long cable, or even longer? Well, if you try to do that you'll quickly find that the length of the cable adds capacitance and...

$7.50

In stock

Angled shot of a Adafruit RFM96W LoRa Radio Transceiver Breakout.

Adafruit RFM96W LoRa Radio Transceiver Breakout - 433 MHz - RadioFruit

Product ID: 3073

$19.95

20 in stock

Adafruit SPI FLASH Breakout - W25Q16 - 16 Mbit / 2 MByte

Product ID: 5635

Sometimes you need a little extra storage for your microcontroller projects: for files, images, fonts, audio clips, etc. If you need lots of space, like in the gigabytes, we always recommend an SD card because you can easily plug it into a computer to edit files. But sometimes you don't need whole gigabytes, you just need a megabyte or two, with the lower cost and...

$2.95

47 in stock

Angled shot of Stereo 20W Class D Audio Amplifier.

Stereo 20W Class D Audio Amplifier - MAX9744

Product ID: 1752

Pump up the volume with this 20W stereo amplifier! This slim little board has a class D amplifier onboard that can drive 2 channels of 4-8 ohm impedance speakers at 20W each. Power it with 5-12VDC using the onboard DC power jack and plug stereo line level into the 3.5mm stereo headphone jack and jam out with ease. Since it's class D, its completely cool-running, no...

$19.95

In stock

Adafruit DS3502 I2C Digital 10K Potentiometer Breakout - STEMMA QT / Qwiic

Product ID: 4286

If you're a person like me that gets exhausted turning knobs all day, the DS3502 is just the ticket to calm all your knob-turning related troubles. Instead of having to turn knobs with your HANDS like an ANIMAL, the DS3502 I2C Digital Potentiometer allows you to let your microcontroller adjust the resistance for you! Now you can free your hands to spin your fidget...

$4.95

In stock

Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout - STEMMA QT / Qwiic

Product ID: 4918

It's a GPIO expander, it's a keypad matrix driver... its the Adafruit TCA8418 Keypad Matrix and GPIO Expander Breakout - a cute and powerful I2C GPIO expander and keypad matrix driver! This chip is quite fancy, with the ability to act as your I2C multi-tool for handling keypads, buttons or LEDs. This chip has 18 total 'I/O' pins, 10 columns and 8 rows. You can of...

$5.95

In stock

Adafruit DS3231 Precision RTC - STEMMA QT

Product ID: 5188

The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal". And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a small, low-power package. We've had a breakout board version of this RTC for a while, but we want to make it even easier for folks to...

$13.95

7 in stock

MCP23017 - i2c 16 input/output port expander

Product ID: 732

Add another 16 pins to your microcontroller using an MCP23017 port expander. The MCP23017 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 16 general purpose pins. You can set each of 16 pins to be input, output, or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs...

$6.95

In stock

Angled shot of a Adafruit Si5351A Clock Generator Breakout Board.

Adafruit Si5351A Clock Generator Breakout Board - 8KHz to 160MHz

Product ID: 2045

Never hunt around for another crystal again, with the Si5351A clock generator breakout from Adafruit! This chip has a precision 25MHz crystal reference and internal PLL and dividers so it can generate just about any frequency, from Best of all, we even have a great tutorial and library to get you started! Our code is designed for use with the Arduino microcontroller...

$7.95

In stock

Angled shot of PCF8523 Real Time Clock Breakout Board.

Adafruit PCF8523 Real Time Clock Breakout Board - STEMMA QT / Qwiic

Product ID: 5189

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for data-logging, clock-building, time stamping, timers, and alarms, etc. Equipped with PCF8523 RTC - it can run from 3.3V or 5V power & logic! We've had a breakout board version of this...

$4.95

In stock

Angled shot of a Adafruit RFM69HCW Transceiver Radio Breakout - 433 MHz.

Adafruit RFM69HCW Transceiver Radio Breakout - 433 MHz - RadioFruit

Product ID: 3071

$9.95

In stock

Mini Thermal Receipt Printer

Product ID: 597

Add a mini printer to any microcontroller project with this very cute thermal printer. Thermal printers are also known as receipt printers, they're what you get when you go to the ATM or grocery store. Now you can embed a little printer of your own into an enclosure. This printer is ideal for interfacing with a microcontroller, you simply need a 3.3V-5V TTL serial...

$49.95

In stock

Adafruit NeoTrellis RGB Driver PCB for 4x4 Keypad

Product ID: 3954

By popular request, we've upgraded our popular Trellis elastomer button kits to now have a PCB with full color NeoPixel support! You heard that right, no more single-color LEDs, you can now have any color you like under the fantastic rubbery button pads we sell. These 4x4 button pad boards are fully tile-able and communicate over I2C. With 5 address pins, you've got...

$12.50

In stock

Angled shot of a Adafruit SPI Flash SD Card.

Adafruit SPI Flash SD Card - XTSD 512 MB

Product ID: 4899

This breakout is for a fascinating chip - it looks like an SPI Flash storage chip (like the GD25Q16) but its really an SD card, in an SMT chip format. What that means is that you wire up like an SD card breakout, and use the SD card libraries you already have for your microcontroller. For example, you can use the built in SD library in Arduino, or for CircuitPython...

$9.50

In stock

Adafruit PCF8574 I2C GPIO Expander Breakout - STEMMA QT / Qwiic

Product ID: 5545

Expand your project possibilities, with the Adafruit PCF8574 GPIO Expander Breakout - an affordable 8 channel I2C expander. GPIO expanders work like this: you have a board with some number of GPIO but not enough for your project - maybe you need more buttons or LEDs. You could upgrade to a board with massive number of GPIO like the Grand Central, or you could pop on...

$4.95

In stock

Membrane 3x4 Matrix Keypad + extras - 3x4

Product ID: 419

Punch in your secret key into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. It's made of a thin, flexible membrane material with an adhesive backing (just remove the paper) so you can attach it to nearly anything. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to...

$3.95

In stock

Top down view of a Adafruit ISO1540 Bidirectional I2C Isolator.

Adafruit ISO1540 Bidirectional I2C Isolator - STEMMA QT / Qwiic

Product ID: 4903

Sometimes you'll find yourself with an I2C bus controller on one side, and an I2C bus device on the other and you gotta keep em (electrically) separated. Maybe because one is Earth-grounded, maybe because you've got some funky power monitoring setup, maybe you want to reduce noise. Whatever it is, you can use the Adafruit ISO1540 Bidirectional I2C Isolator to add...

$8.95

In stock

4x4 Matrix Keypad

Product ID: 3844

Punch in your secret key (or Jenny's number) into this numeric matrix keypad. This keypad has 16 buttons, arranged in a telephone-line 4x4 grid. The keys are connected into a matrix, so you only need 8 microcontroller pins (4-columns and 4-rows) to scan through the pad. Check the tutorials tab for links to an Arduino library and example code. We include some header...

$5.95

In stock

Angled shot of a Adafruit I2C Non-Volatile FRAM Breakout.

Adafruit I2C Non-Volatile FRAM Breakout - 256Kbit / 32KByte

Product ID: 1895

FRAM, or Ferroelectric Ram, is the coolest new data storage method that all the fashion magazines are talking about. Oh wait, no that's quilted handbags. But FRAM is pretty damn cool too! It's similar to Dynamic random-access memory, only with a ferroelectric layer instead of a dielectric layer. This gives it stable handling (the bytes you write are non-volatile)...

$9.95

In stock

MCP23008 - i2c 8 input/output port expander

Product ID: 593

Add another 8 pins to your microcontroller using an MCP23008 port expander. The MCP23008 uses two i2c pins (these can be shared with other i2c devices), and in exchange gives you 8 general purpose pins. You can set each of 8 pins to be input, output, or input with a pullup. There's even the ability to get an interrupt via an external pin when any of the inputs change...

$1.95

74 in stock

Mini Remote Control

Product ID: 389

This little remote control would be handy for controlling a robot or other project from across the room. It has 21 buttons and a layout we thought was handy: directional buttons and number entry buttons. The remote uses the NEC encoding type and sends data codes 0 thru 26 (it skips #3, #7, #11, #15, #19 and #23) to address #0. You can use this to control something...

$4.95

In stock

Angled shot of a Adafruit SPI Non-Volatile FRAM Breakout.

Adafruit SPI Non-Volatile FRAM Breakout - 64Kbit / 8KByte

Product ID: 1897

$5.95

In stock

DS2413 1-Wire Two GPIO Controller Breakout

Product ID: 1551

You're too cool for I2C, and SPI has so many wires, 8-bit parallel... how can that be fashionable!? You are a 1-Wire kinda gal, and you want more 1-Wire breakouts in your life to complement all of your great engineering. Well rock on, because here you go, it's a 1-Wire controller with two open-drain GPIO. You can put as many of the DS2413's as you want on a single...

$5.95

In stock

74HC595 Shift Register - 3 pack

Product ID: 450

Add lots more outputs to a microcontroller system with chainable shift registers. These chips take a serial input (SPI) of 1 byte (8 bits) and then output those digital bits onto 8 pins. You can chain them together so putting three in a row with the serial output of one plugged into the serial input of another to make 3 x 8 = 24 digital outputs. You can chain pretty...

$2.95

21 in stock

Adafruit ATtiny817 Breakout with seesaw - STEMMA QT / Qwiic

Product ID: 5233

This breakout board is a "three in one" product: The ATtiny817 is part of the 'next gen' of AVR microcontrollers, and now we have a cute development/breakout board for it, with just enough hardware to get the chip up and running.It's also an Adafruit seesaw board. Adafruit seesaw is a near-universal converter framework which allows you to add and extend hardware...

$4.95

In stock

3x4 Matrix Keypad

Product ID: 3845

Punch in your secret key (or Jenny's number) into this numeric matrix keypad. This keypad has 12 buttons, arranged in a telephone-line 3x4 grid. The keys are connected into a matrix, so you only need 7 microcontroller pins (3-columns and 4-rows) to scan through the pad. Check the tutorials tab for links to an Arduino library and example code. We include some header...

$6.50

38 in stock

Assembled 6-pin ISP breakout with all headers soldered on.

Adafruit 6-pin AVR ISP Breadboard Adapter Mini Kit

Product ID: 1465

Programming AVR? Always Googling the pinout? Well, now no longer! It's rare to find a mini kit so elegant, it deserves its own Haiku. A simple breakout, 2x3 box header in the center, two 1x3's on the side. Plugs into any breadboard for neat wiring (in both nifty and clean senses of the word). Comes with a quality mini PCB, a 2x3 box header and a small stick of 0.1"...

$0.95

In stock

Adafruit DS1841 I2C Digital 10K Potentiometer Breakout - STEMMA QT / Qwiic

Product ID: 4570

Potentiometers are the perfect tool when you want to change your circuit by turning a knob. Turns out, there are times when you want to adjust your circuit without manually turning a knob, and the DS1841 I2C Logarithmic Resistor from Maxim can do just that. It's a programmable resistor, similar to an I2C potentiometer like the DS3502 I2C Potentiometer, so why...

$5.95

In stock

Adafruit ATSAMD09 Breakout with seesaw

Product ID: 3657

Adafruit seesaw is a near-universal converter framework which allows you to add and extend hardware support to any I2C-capable microcontroller or microcomputer. Instead of getting separate I2C GPIO expanders, ADCs, PWM drivers, etc, seesaw can be configured to give a wide range of capabilities. For example, our ATSAMD09 breakout with seesaw gives you 3 x 12-bit ADC...

$4.95

In stock

Finger pressing a button on lit up elastomer button pad

Adafruit Trellis Monochrome Driver PCB for 4x4 Keypad & 3mm LEDs

Product ID: 1616

This item is just for the Trellis driver PCB assembly: LEDs and buttons not included. Trellis is an open source backlight keypad driver system. It is easy to use, works with any 3mm LEDs and eight tiles can be tiled together on a shared I2C bus. This PCB is specially made to match the Adafruit 4x4 elastomer keypad. Each Trellis PCB has 4x4 pads and 4x4 matching spots...

$9.95

In stock

Adafruit SPI Non-Volatile FRAM Breakout - 4 Mbit / 512 KBytes - MB85RS4MT

Product ID: 4719

$17.95

In stock

Adafruit SPI Non-Volatile FRAM Breakout - 2 Mbit / 256 KBytes - MB85RS2MTA

Product ID: 4718

$12.95

99 in stock

Top down view of a Adafruit Stereo FM Transmitter with RDS/RBDS Breakout next to a 11-pin header and under blue string coiled up.

Adafruit Stereo FM Transmitter with RDS/RBDS Breakout - Si4713

Product ID: 1958

Yaaar! Become your very own pirate radio station with this FM radio transmitter. This breakout board, based on the best-of-class Si4713, is an all-in-one stereo audio FM transmitter that can also transmit RDS/RBDS data! Wire up to your favorite microcontroller (we suggest an Arduino) to the I2C data lines to set the transmit frequency and play line-level audio into...

$19.95

In stock

Adafruit DRV2605L Haptic Motor Controller - STEMMA QT / Qwiic

Product ID: 2305

The DRV2605 from TI is a fancy little motor driver. Rather than controlling a stepper motor or DC motor, its designed specifically for controlling haptic motors - buzzers and vibration motors. Normally one would just turn those kinds of motors on and off, but this driver has the ability to have various effects when driving a vibe motor. For example, ramping the...

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$7.95

Out of stock

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MCP3008 - 8-Channel 10-Bit ADC With SPI Interface

Product ID: 856

Need to add analog inputs? This chip will add 8 channels of 10-bit analog input to your microcontroller or microcomputer project. It's super easy to use and uses SPI so only 4 pins are required. We chose this chip as a great accompaniment to the Raspberry Pi computer because it's fun to have analog inputs but the Pi does not have an ADC. We have a tutorial and code...

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$4.50

Out of stock

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Angled shot Adafruit MCP23017 I2C GPIO Expander Breakout

Adafruit MCP23017 I2C GPIO Expander Breakout - STEMMA QT / Qwiic

Product ID: 5346

We’ve gotten a lot of requests for a MCP23017 breakout and we’ve always sorta been like “ehh why not just use the DIP chip?” but with STEMMA QT we could see the use case for a plug and play version that comes with all the passives on board. This Adafruit MCP23017 I2C GPIO Expander Breakout has 16 GPIO with matching ground pad. We particularly...

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$5.95

Out of stock

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Angled shot of a Adafruit RFM69HCW Transceiver Radio Breakout.

Adafruit RFM69HCW Transceiver Radio Breakout - 868 or 915 MHz - RadioFruit

Product ID: 3070

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$9.95

Out of stock

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Mini Thermal Receipt Printer Starter Pack

Product ID: 600

Hit the ground running (and printing!) with this starter pack that includes a thermal printer and all the extras and save a few dollars while you're at it. Includes: A mini thermal receipt printer - with cables and plastic mounting shims. A roll of 50' long thermal receipt paper - the perfect amount for the thermal printer. BPA-free.5V 2A power supply - an ideal...

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$61.95

Out of stock

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