PMS5003 and MiniGarden

Support
21

I thought it would be there when I looked on GitHub but the __init__.py file I have found, in the enviroplus folder on my PI, does not contain that line. In fact I can’t even find a folder relating to PMS5003, despite having run the Enviroplus board with it attached for several weeks???
I like the idea of adding pin_enable=x, pin_reset=y to my code that would save a lot faff. Thanks for that suggestion.

22

If I remember right installed modules go off somewhere else that Python knows to look in, so it might not be somewhere obvious. I should be getting one of these sensors by the weekend, if you’ve not got it sorted by then I’ll have a poke at it, but adding the pin definitions when initialising the sensor definitely seems like it would be the easiest method.

23

Have a look in
/etc/systemd/system/
and
/usr/bin/

24

Thanks both.
Alphanumeric: I couldn’t find it in those locations.
Shoe: This is the code I currently have, it comes from nopheads EnviroPlusWeb.py app, where he has add fan speed control on GPIO 4. It was what I was running with the EnviroPlus board before I deconstructed the project to individual sensors. Which has been interesting!

from pms5003 import PMS5003, ReadTimeoutError as pmsReadTimeoutError

pms5003 = PMS5003() # PMS5003 particulate sensor

IO.setmode(IO.BCM)   # Set pin numbering
IO.setup(4,IO.OUT)   # Fan controller on GPIO 4
pwm = IO.PWM(4,1000) # PWM frequency
pwm.start(100)       # Duty cycle
25

It was a bit of a shot in the dark, those two locations are where Pimoroni’s Plasma software stored config files. I figured it couldn’t hurt to look there.

26

Found it !
If I edit it will that then be read when the code loads the sensor?

PMS5003Init
PMS5003Init1504×267 51.5 KB

27

Yes, but first I’d simply try modifying your script to read;

pms5003 = PMS5003(pin_enable=x, pin_reset=y)

It’ll be safer and will avoid potential complications in the future.

28

Thanks I will try that. It will give me more flexibility if I ever want to back to the EnviroPlus.

29

Another GPIO question I am afraid!
Can a pin that has been designated a PI function be ‘downgraded’ to a simple On/Off GPIO pin?
The Mini Garden has a limited number of un-designated connections that I can use for my Rain and Wind sensors, a mixture of Reed switches and an ADC for wind direction. I would like to change a couple of these. GPIO pin 33 (PWM1), pin 19 (PCM_FS) and pin 24 (CE0)
Thanks

30

All of the pins which aren’t grounds, 5V and 3v3 except GPIO27/28 can act as simple on/off pins. The special fuctions which some of them can do are optional, if you want to use it as a normal I/O pin then you just have to set it up like it is a normal I/O pin (e.g. see the GPIO Zero examples).

31

Thanks Shoe, I will start to experiment!