#STEMMAQT

[adafruit]

BU9796 prototype finally comes to light ✨🔧🖥️

We covered the BU9796 a loooooooooong time ago on the Great Search while looking for an I2C LCD segment driver ...

but sadly, we never got around to making that breakout board. Til' now! This one features the FS series of the chip, which has some more segments: in this board, we expose 4 common and 18 segments to keep the board from getting too big. This chip runs at 3V or 5V, so it should be easy to use with any device. We still need to figure out what VLCD connects to - some parts of the datasheet say VDD, and some say VSS, so we left a jumper on the back. That way, we can connect it correctly when we are more awake. Stemma QT makes this a plug-and-play driver for just about any micro! Coming soon…

[how2to18]

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[adafruit]

USB2422 configurable USB Hub chip

The Microchip USB2422 is kinda neat, its a low cost USB hub with EEPROM you can connect to I2C to configure. We thought it would make a nice little breakout for whenever you have a USB port but you sorta wish you had two! Maybe even embed in some hardware! We just made a couple USB hub breakouts with the CH334F ...

but this board might be nice if you want more configurability & control: the stemma QT connector on the end is what you can plug into to program it. we designed rev A of this board in 2021 and then it got slammed by part shortages, now its back in stock so we can revisit this design!

[adafruit]

PCB of the day! Adafruit I2C Stemma QT Rotary Encoder Breakout with NeoPixel - STEMMA QT / Qwiic 🔧🔄🎛️

Rotary encoders are soooo much fun! Twist them this way, then twist them that way. Unlike potentiometers, they go all the way around and often have little detents for tactile feedback. But, if you've ever tried to add encoders to your project, you know they're a real challenge to use: timers, interrupts, debouncing…

This Stemma QT breakout makes all that frustration disappear - solder in any 'standard' PEC11-pinout rotary encoder with or without a push switch. The onboard microcontroller is programmed with our seesaw firmware and will track all pulses and pins for you and then save the incremental value for querying over I2C. Plug it in with a Stemma QT cable for instant rotary goodness with any microcontroller from an Arduino UNO up to a Raspberry Pi.

You can use our Arduino library to control and read data with any compatible microcontroller. We also have CircuitPython/Python code for use with computers or single-board Linux boards.

[adafruit]

PCB of the Day! Adafruit AMG8833 IR Thermal Camera Breakout - STEMMA QT 🔥📸🔌

Add heat-vision to your project with an Adafruit AMG8833 Grid-EYE Breakout! This sensor from Panasonic is an 8x8 array of IR thermal sensors. When connected to your microcontroller (or raspberry Pi) it will return an array of 64 individual infrared temperature readings over I2C. It's like those fancy thermal cameras, but compact and simple enough for easy integration.

[adafruit]

PCB of the Day! The VCNL4200 has long-ranging vision 🔍🤖🛠️

The VCNL4200 proximity sensor https://www.digikey.com/en/products/detail/vishay-semiconductor-opto-division/VCNL4200/7394601 , which we found on last weeks The Great Search ---

can detect motion up to 1.5 meters away, and has an I2C interface that makes it an excellent match for a Stemma QT board prototype. Which is what we've got here! Note the IR LED requires an external P FET to drive it!

[adafruit]

PCB of the day! SGP40 Air Quality Sensor Breakout - VOC Index - STEMMA QT / Qwiic 👃🥛🌬️

sniff sniff … do you smell that? You no longer need to stick your nose into a carton of milk; you can build a digital nose with the SGP40 Multi-Pixel Gas Sensor, a fully integrated MOX gas sensor. This is an excellent air quality sensor from the sensor experts at Sensirion, with I2C interfacing, so you don't have to manage the heater and analog reading of a MOX sensor. It combines multiple metal-oxide sensing and heating elements on one chip to provide more detailed air quality signals.

[adafruit]

Final shield test for a Metro-shaped RP2040 🔬🚇🛠️🔌📲💾🚀📈✅🏭

We're testing out prototypes of a new Metro https://www.adafruit.com/search?q=metro RP2040 , while the 'classic Arduino shape' is not as popular these days with dev boards as it used to be, we like the roomy layout, with lots of socket headers, and plenty of space for accessories like a MicroSD card socket with both SPI and SDIO pinout, SWD debug port, Stemma QT, and 12V DC power port. our last test is always to plug in our 2.8" captouch TFT shield https://www.adafruit.com/product/1947 because it tests both SPI and I2C. this passes and since all the GPIO are accounted for, we just have to wrap up the silk and it's off to fabrication!

[adafruit]

The MAX31328 is a modernized DS3231 🔬🕰️🔋

The ADI DS3231 - previously known as Maxim, previously previously known as Dallas Semi - is a high precision Real Time Clock - its one of the best out there thanks to it's internal temperature compensated crystal. but its kinda old, and ADI has done a refresh on the chip while keeping it software/firmware compatible. The MAX31328 https://www.digikey.com/short/5jff8p90 is a different, smaller package, probably uses a modern-er process too. We covered this family on EYE ON NPI about a year ago https://blog.adafruit.com/2022/05/26/eye-on-npi-analog-devices-maxim-max31329-real-time-clock-rtc-eyeonnpi-adi_news-digikey-adafruit/ and parts we booked back then finally appeared so we can design a prototype board! here it is in our STEMMA QT format - on the back is a coin cell holder to keep time for up to 7 years.

[adafruit]

Prototype build time lapse! Adafruit ENS160 MOX Gas Sensor - Sciosense CCS811 Upgrade - STEMMA QT / Qwiic 🛠️🌬️📈

The ENS160 Gas Sensor is an excellent air quality sensor from ScioSense, replacing the discontinued CCS811, with new driver code. This sensor incorporates a microcontroller and MOX sensor to provide detailed air quality readings via an I2C interface, but calibration against known sources is required for precision. The sensor, on a custom PCB in the STEMMA QT form factor for easy interfacing, allows for humidity and temperature compensation and supports both 3.3V and 5V systems.

In stock and shipping now.

[adafruit]

Yes! Stemma QT boards work with the Arduino UNO R4! 🎉🔌🛠️📡💡🌐

we just got our UNO R4 WiFi, featuring the Renesas RA4M1 series of chips https://blog.adafruit.com/2023/05/25/eye-on-npi-renesas-ra4m1-microcontroller-series-eyeonnpi-digikey-renesasglobal-digikey-adafruit/ an ESP32 wifi co-processor, an adorable LED grid, and a JST SH 4-pin connector…a.k.a a Qwiic port! Yay it is so great to see this connector becoming standardized on so many platforms. It means that all of our STEMMA QT devices https://www.adafruit.com/category/1018 will work plug-and-play. Here we're testing it with an OLED https://www.adafruit.com/product/938 and SHT41 breakout https://www.adafruit.com/search?q=sht4 we only had to update our demo to use Wire1 instead of Wire, since the secondary I2C bus is used for this connector. No soldering required!

[adafruit]

PCB of the day! NeoKey 1x4 QT I2C - Four Mechanical Key Switches with NeoPixels - STEMMA QT / Qwiic 🔧🎛️🔗

NeoKey 1x4 QT I2C Breakout features 4 mechanical keys with customizable colors. It fits Cherry MX/compatible switches, has 4 Kailh sockets, and connects via I2C. Multiple boards can be chained together, up to 16 on a single bus. Compatible with Arduino and CircuitPython, super flexibility for macropad creation.

[adafruit]

Time Lapse Prototype Build! Adafruit PCF8575 I2C 16 GPIO Expander Breakout - STEMMA QT / Qwiic 🔧🔌⚙️

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. Connect it over I2C and then you can send/receive I2C commands to control the GPIO pins to write and read them. It's going to be slower than direct GPIO access, but maybe that doesn't matter if it takes a millisecond instead of a microsecond. You only need the two I2C pins, and you can even share the I2C port with other sensors and devices. Heck, you can even add more expanders for massive I/O control!

[adafruit]

rotarotarotarotary (that's four times a rotary encoder) 🔄🔢🕹️🔵🔴⚪🟣🌈💡🛠️🎛️🔌🔋🎚️💻💾🧩💡🚀

count em: one, two, three…four rotary encoders encrust this new Stemma QT board! with a lil attiny817 running the adafruit seesaw code, we can now read 4 encoders and 4 switches plus control 4 matching neopixels all over I2C. great for when you do not want to spend all your microcontroller cycles counting out all your interrupted pins plus also clocking out neopixels. we don't have a ton of room on this 'standard sized' 4 inch by 1 inch PCB, so we stuck the pixels underneath. now on low cost encoders you can't really see the lighting, but on fancy 'clear body' encoders you can get a cool glowing effect! there's even clear or translucent knobs one can get that will diffuse the color nicely.

[adafruit]

Spring's over but it's always time to clear out dusty old designs 🌸🧹🔧🎛️💡🔄

Ok it's no longer spring, but that's no excuse to not do some spring cleaning on old PCBs. theres quite a few designs that we started in mid 2020 that languished due to part shortages. here's a PCB we did a bunch of work on 3 years ago! then we recently noticed that we could probably revive it, a few parts needed replacing: the 3.3V buck converter and the backlight booster both got discontinued, and we now add stemma QT ports on I2C-capable devices. what do you think this board does?

[how2to18]

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