jonoxer
commented
4 years ago The fan definitely turns off with my sensors when I issue the pms.sleep() instruction. My best guess is that we have different versions of the PMS5003. Last time I checked there were about 7 different versions, all physically identical but with slightly different firmware so the pins behave differently. For example, there's a version that uses the comms pins for I2C, and others that expose different modes or features. There's a lot of overlap between them which is really confusing. Maybe you have a version that requires hardware control of the fan, and doesn't respond to software control.
This might just be my sensor, but the fan remains on after the pms.sleep() instruction is issued. As a workaround, I connected the hardware sleep pin of the sensor (pin3) to a spare IO pin on the D1, then pull this pin low when the sensor needs to sleep. This stops the fan and I can see the current draw drop to a few milliamps until it is restarted.
I did check that the issued serial command was being sent by the D1 - it just seems to be ignored by the PMS5003?? I note that in the video we see the (very cool wifi) power supply drop the current output, but did the fan stop? Great project BTW - I love it (wifie hates it as I have Openhab reminding her to turn on the kitchen extractor fan when cooking) :-)