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User avatar
By jiggermole
#214422
It says its supported out of the gate, however in the terminal it will not detect the SCD30. I have another sensor, the UV sensor and it detects that just fine. I have power to the board, but the open log is just not seeing it.
User avatar
By TS-Brandon
#214449
Can you provide a picture of your setup? Which data bus are you using?
User avatar
By jiggermole
#214574
Im using i2c. what you see is the scd30 and the uv sensor but I have tried it with just the scd30 connected by itself and it still doesn't work.
20200428_015754.jpg
20200428_015745.jpg
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User avatar
By TS-Brandon
#214587
Try pulling the 'SEL' pin low to ground. The datasheet says you can leave it floating or pull to ground for I2C.
User avatar
By TS-Brandon
#214643
Have you tired the SCD30 with another microcontroller, such as a RedBoard?
User avatar
By jiggermole
#214681
no. I have no other boards in that quic ecosystem. The whole point of getting this setup was so I could just plug everything in and get logging. But I guess that isn't the case.
User avatar
By jiggermole
#215109
V1.3 of the firmware did allow it to connect. Its logging now.
And regarding the not being able to reliably not work. I tried a minimum of 10 times and it didn't work a single time.
And kind of an unrelated note. Since I was ordering a redboard I ordered the qwiik surface mount connectors. On the back of the SCD30 there are pads that are the right dimension for the quick connector. Didn't check with a meter. They're not for the qwiic connector. May want to make a note on the product page for boneheads like me. I ordered a second SCD30 so its fine.
User avatar
By liquid.soulder
#215117
jiggermole - I'm glad this is working for you now. Thanks for reporting the issue so we could address it. I'm not familiar with the SCD30 but I was curious about the pads on the back - taking a look I can confirm that they are not in the correct order to be compatible with Qwiic.

The Qwiic standard puts four pins in this order:
- GND
- VCC (3.3V)
- SDA
- SCL

The pads on the SCD30 appear to be in the order:
- VCC
- GND
- SCL
- SDA

Which is unfortunately not a simple rotation/mirror of the Qwiic specification. Therefore the only way to use a qwiic connector on those pads is to use re-route the pins as needed. You could, for example, use two of these Qwiic -> breadboard cables to bridge the gap - just being mindful of what pins really go where...
User avatar
By jiggermole
#215710
Yeah like I said, I didn't check before trying the quick connector, and if I did someone else might pull a dumb as well. I used a short qwiic cable cut one end off and soldered like in the picture.
I do have another question. Sorry for the long time between posts.
I'm having some trouble dialing the logging delay. In the logging menu it has time between logs in seconds. I put that at 300 seconds for 5 minutes, but it logs every 40 seconds. Set it for 600 seconds and it is 80 seconds between logs. Doing the math I set it for 2250 for 5 minutes and it logs every 24 seconds. So not sure whats up with that.
User avatar
By jiggermole
#215712
okay so more information. Looks like it caps out at 130 secondsish. If I request it to log at 150 seconds I get a reading roughly every 11ish seconds. Anything below 130 seconds is accurate. Above that, it rolls over.
By n1ist
#215716
Sounds like the time is stored in a signed 8-bit number. I guess it will cap out at 127 seconds.
300 mod 128 = 44, 600 mod 128 = 88
That doesn't work for the 2250 but 250 mod 128 = 25, so the 2250 maybe getting parsed wrong as well.
/mike
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