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AHT20 STEMMA board not recognized
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AHT20 STEMMA board not recognized

by stephenfeagin on Mon Jan 24, 2022 4:42 pm

I am using a Metro M4 Airlift Lite, and I have both an AHT20 STEMMA board and a DHT20 module. I have no problem running the simple test example with the DHT20, using both CircuitPython and Arduino. But for the AHT20 STEMMA, the code will not run. In CircuitPython, it just tells me that there is no I2C object at address 0x34. In Arduino, it will run but the measurements all come back as 0. I have double and triple checked wiring, and I can't see any reason why the AHT20 wouldn't be recognized. Is it just a dud? Is there something that has to be done notably differently than what the product overview (https://learn.adafruit.com/adafruit-aht20) shows?

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Re: AHT20 STEMMA board not recognized

by dastels on Mon Jan 24, 2022 4:44 pm

Can you post clear photos of the wiring and connections?

Dave

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Re: AHT20 STEMMA board not recognized

by stephenfeagin on Tue Jan 25, 2022 10:57 pm

I’ve tried both ends of the breakout and two different JSTs. Doing i2c.scan()in circuitpython doesn’t find any I2C addresses.
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Re: AHT20 STEMMA board not recognized

by adafruit2 on Wed Jan 26, 2022 1:52 am

make sure you are powering it from 3v not 5V

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Re: AHT20 STEMMA board not recognized

by stephenfeagin on Wed Jan 26, 2022 1:29 pm

Very good to know, I hadn't realized it needed 3V. I switched that over but it's still not showing up.

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Re: AHT20 STEMMA board not recognized

by adafruit2 on Wed Jan 26, 2022 1:32 pm

ok good! is there something on the sensor board itself, could you try taking another photo? theres a red dot but inclear what it is

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