Dust sensor with grove pi plus

yashwantptl7 · May 14, 2019, 7:40am

I followed all instructions provided here http://wiki.seeedstudio.com/Grove-Dust_Sensor/#play-with-raspberry-pi for dust sensor but unable to receive any data…although the code is running fine without any error…
Also my dust sensor is not PPD42NS instead I am using DSM501a(which is copy of the former). Is it ok to use this sensor or will I have to use PPD42NS only??

RobertLucian · May 14, 2019, 9:02pm

Hi @yashwantptl7,

As long as the clone is outputting the same kind of digital signal, then it’s all going be fine. I don’t think the problem in this case comes from the clone, but from the instructions.

So, let’s see if there’s a problem with how the GrovePi got set up firstly.

We no longer install the GrovePi by asking the user to clone the repo and then just run the scripts without a prior setup of the GrovePi’s package. So, right now, you have to run:

curl -kL dexterindustries.com/update_grovepi | bash

Once you have successfully run this command, you will have the GrovePi’s library installed on the Raspberry Pi.
The next step that still needs to be done is update the GrovePi’s firmware.

cd /home/pi/Dexter/GrovePi/Firmware
bash update_firmware.sh

After this, go on and run this script (use the mentioned port for the dust sensor in the script):

github.com

DexterInd/GrovePi/blob/master/Software/Python/grove_dust_sensor.py#L36-L60


# USAGE
#
# Connect the dust sensor to Port D2 on the GrovePi. The dust sensor only works on that port
# The dust sensor takes 30 seconds to update the new values
#
# the fist byte is 1 for a new value and 0 for old values
# second byte is the concentration in pcs/0.01cf


import time
import grovepi
import atexit


atexit.register(grovepi.dust_sensor_dis)


print("Reading from the dust sensor")
grovepi.dust_sensor_en()
while True:
    try:
		[new_val,lowpulseoccupancy] = grovepi.dust_sensor_read()
		if new_val:

This file has been truncated. show original

If you still have issues, I might suggest you check if the GrovePi is detected at address 0x04 by running i2cdetect -y 1, by importing the grovepi module and seeing if there’s a works_with_firmware variable in the module’s global scope and in seeing what grovepi.version gives you back.

And finally, you can find out more by checking the GrovePi’s documentation here:
https://dexterind.github.io/GrovePi

Thank you!

yashwantptl7 · May 15, 2019, 9:54am

Hi Robert,

Thanks for the reply. I went through your suggestion but couldn’t succeed. The code runs till “Reading from the dust sensor” and hangs their…i guess their is some problem with line 51 grovepi.dust_sensor_en(), which is unable to execute. I have also checked for grovepi detection, it is fine…Are you sure their is no problem with sensor(DSM501a) ?..I also did troubleshooting which is hanging at checking for firmware version(I that helps).

Thanks

se.hematpour · July 23, 2019, 1:51pm

Hi @yashwantptl7,

I have the same issue. Did you find the solution.

yashwantptl7 · July 23, 2019, 2:25pm

it was no working with DSM501a so I bought PPD42NS sensor and its working.

se.hematpour · July 24, 2019, 5:39pm

@RobertLucian

Hi Robert,

two days ago, I used [Raspbian For Robots] to install my GrovePi plus. I installed it successfully. then connected the Grove dust sensor with the script you provided in this thread. but I just got zero. So based on some advice on this forum I rolled back to firmware version 1.2.7. afterward, I was no longer able to check my firmware. By running grove_dust_sensor.py I got the message “reading from the sensor” and then nothing. So I formatted my SD card, used the fresh image for raspberry and used this command for installing the GrovePi:
curl -kL dexterindustries.com/update_grovepi | bash
I installed GrovePi successfully. but when I run :

bash firmware.update.sh

it says no such file or directory.

I run i2cdetect -y 1, but it just give me blank. Does this means my Grovepi has been burnt?

se.hematpour · July 24, 2019, 5:39pm

Thank you for your reply