Issues with Dust sensor PPD42

jorg
New Member

Posts: 15
Raspberry Pi: Yes

Issues with Dust sensor PPD42 Sept 9, 2020 22:32:02 GMT -8

Quote

Post by jorg on Sept 9, 2020 22:32:02 GMT -8

When running testDust.py
I get just readings of 0

when running SkyWeather.py
I get eventually:

dustSensor = SDL_Pi_DustSensor.SDL_Pi_DustSensor(pi, config.DustSensorPin) # set the GPIO pin number
File "./SDL_Pi_DustSensor/SDL_Pi_DustSensor.py", line 41, in __init__
pi.set_mode(gpio, pigpio.INPUT)
File "/usr/lib/python2.7/dist-packages/pigpio.py", line 1344, in set_mode
return _u2i(_pigpio_command(self.sl, _PI_CMD_MODES, gpio, mode))
File "/usr/lib/python2.7/dist-packages/pigpio.py", line 993, in _pigpio_command
sl.s.send(struct.pack('IIII', cmd, p1, p2, 0))
AttributeError: 'NoneType' object has no attribute 'send'

I double checked the wiring and config:
DustSensorPin = 19
DustSensorPowerPin = 26

Ordered/received the kit about a month ago - Shinyey PPD42
Read that there is a new version, not sure what I have and are happy to upgrade ...

How do I debug this?

SDL Global Moderator Posts: 5,655 Raspberry Pi: Yes Other Device: PC, arduino, beagleBone	Issues with Dust sensor PPD42 Sept 12, 2020 9:15:54 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SDL on Sept 12, 2020 9:15:54 GMT -8 I think you don't have pigpio installed. We are selling out our current inventory of the PPD42 and switching to the new Laser based one. Works really well. Here's what I am getting this morning. Terrible air quality!

jorg New Member Posts: 15 Raspberry Pi: Yes	Issues with Dust sensor PPD42 Sept 22, 2020 12:01:16 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by jorg on Sept 22, 2020 12:01:16 GMT -8 ... odd - that was using unmodified code from you and your SD card. Since then tried to upgrade to python3 (not too successful) ... but now it works ;-)

SDL Global Moderator Posts: 5,655 Raspberry Pi: Yes Other Device: PC, arduino, beagleBone	Issues with Dust sensor PPD42 Sept 25, 2020 16:51:23 GMT -8 Quote Select Post Deselect Post Link to Post Member Give Gift Back to Top Post by SDL on Sept 25, 2020 16:51:23 GMT -8 Hmmm. Ah the complexities of the Raspberry Pi Operating System! BP

Post by jorg on Sept 9, 2020 22:32:02 GMT -8

Post by SDL on Sept 12, 2020 9:15:54 GMT -8

Post by jorg on Sept 22, 2020 12:01:16 GMT -8

Post by SDL on Sept 25, 2020 16:51:23 GMT -8

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