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SCD-30 not functioning
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SCD-30 not functioning

by Tiberious726 on Sun Jun 06, 2021 3:45 pm

The SCD-30 I ordered in order #2579929-4410187484 doesn't appear to be functioning properly.

Using adafruit-circuitpython-scd30, while the board is found at its default i2c address and is initialized, scd.data_available always returns 0, in fact, scd._read_register() always returns 0 for addresses in range.

Furthermore, both it and the FT232H I am validating it with get _quite_ hot after a few minutes, far more so than the FT232H gets running all the other sensors from this order chained together (which should be a _much_ higher load, the particle sensor alone needs more current).

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Re: SCD-30 not functioning

by adafruit_support_mike on Sun Jun 06, 2021 9:26 pm

Post a photo showing your hardware and connections and we'll see if those have any clues. 800x600 images usually work best.

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Re: SCD-30 not functioning

by Tiberious726 on Mon Jun 07, 2021 2:17 pm

connected.jpg
connected.jpg (60.4 KiB) Viewed 260 times


Here's a close up of the sensor, it looks like there might be some melting bridging the fifth solder point to another trace. Also, that metal disk in the upper left-hand corner looks really messed up (crushed and covered in a black substance) compared to the other seven.
board.jpg
board.jpg (158.09 KiB) Viewed 260 times

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Re: SCD-30 not functioning

by adafruit_support_mike on Wed Jun 09, 2021 5:46 pm

Am I correct that you have seven other SCD-30 sensors working normally, and this one is behaving differently?

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Re: SCD-30 not functioning

by Tiberious726 on Thu Jun 10, 2021 6:03 pm

No, this is my first SCD-30. The PMSA003I, SGP40, DPS310, and AHT20 from that order are all functioning as expected.

If there isn't anything else to try particular to the SCD-30, could I get it replaced?

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Re: SCD-30 not functioning

by adafruit_support_mike on Fri Jun 11, 2021 8:18 pm

The marks on the connectors are normal. The photos on the product page have similar marking:

https://www.adafruit.com/product/4867

Running hot could also be normal.. the sensor uses an IR source to measure the gas concentrations. How much current does your unit draw?

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Please be positive and constructive with your questions and comments.