STEMMA Sunday! Ok, it’s Tuesday … LPS3x MCP2221 BNO080 LSM9DS1 BH1750 LIS3xx @adafruit @sparkfun @seeedstudio @dfrobotcn #qwiic #grove #gravity #stemma #stemmaQT


STEMMA Sunday! Ok, it’s Tuesday … we got super-busy with making things, the STEMMA above is the LPS3x pressure sensor, so that means we can make a sip-and-puff controller soon!

Here are some more!


First up, the MCP2221 is a really low cost USB-C to GPIO adapter that has ADC/DAC/GPIO/I2C/UART support. The FT232H is more powerful in some ways, but we like the simplicity and cheap BoM of this chip. We thought it could make a great USB C to I2C adapter with GPIO breakouts.


Next: some breakouts! The BNO080 is a bosch 9-DoF with an ATSAMD20. Hillcrest added IMU code so you can use it for absolute-orientation uses without needing AHRS or Madgwick code wrangling. Now in STEMMA QT format! It’s a little larger than most STEMMA’s cause we have full level shifting circuitry for all the pins.


The LSM9DS1 is a 9-DoF without a coprocessor, but it’s pretty cheap! We’ve already got a breakout for this chip, but we’d like to STEMMAfy it so it can be used in tethered applications a lot easier.


The BH1750 and friends are common low-cost light/lux sensors.


LIS3xx breakout – we’ll be able to use this layout to STEMMify the LIS3DH breakout we have, and also support the higher-g LIS331 and super-high-g H3LIS331.

Stemma Stemmaqt-1

Adafruit STEMMA & STEMMA QT Plug & play connectivity

WHAT IS STEMMA? STEMMA is not an original idea, we’re working within an ecosystem of many other plug and play systems. We started STEMMA in 2014, and intended to be compatible with Grove only (cause that’s all that existed at the time) but then when Qwiic came around in 2017, added a smaller connector so we could work with those parts too!

STEMMA attempts to be as cross-compatible as possible with both Grove and Gravity (compatible connectors & 3-5V power/logic). STEMMA QT is cross-compatible with Qwiic - STEMMA QT connector/cable is same as Qwiic. You can use STEMMA QT devices with Qwiic devices/controllers.

Adafruit STEMMA & STEMMA QT: Plug & play connectivity – If you’re lookin for the differences between each and what works (and what does not), skip to the comparison page and if we missed anything, post in the comments!

More STEMMA & STEMMA Sunday! – Adafruit.

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