Using the program

[hockenator]

Paul, thanks for your great work. I'm currently like to connect an SVM to a RasPi for an indoor tVOC sampling and logging campaign. I followed your recommended steps in compiling the bcm2835 driver. Everything was fine, but: What I have to do now? My goal is to use a SVM30 library in a python code...
I'm a little bit confused, because "a new kid on the block".
Can you give a hint please?

[paulvha]

Hi, thanks for the feedback.
Make sure to read the SVM30.odt on how to compile and create an object and use it from the command line.

For another project (scd30) I got some good advice how to integrate that with Python. I took the following from that project that you can tailor to your need :

Stay Safe,
Paul

---

Received the following code from Aeolus1364 (credits to him) .
import subprocess, shlex
def run_command(command):
process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE)
while True:
output = process.stdout.readline()
if output == '' and process.poll() is not None:
break
if output:
print(output.strip())
rc = process.poll()
return rc

run_command("./scd30")
It was part of an issue to integrate the scd30 program in Python and capture the output. To enable this the p_printf() changes were applied (version 3.0.2). p_printf() performs a ‘fflush(stdout)’ after each write which seems to be necessary for the integration to work well. Normally a line is detected after newline (which is performed as well in do_output()).
His full code is posted on : https://github.com/Aeolus1364/SCD30_Python_Library

[hockenator]

THX for your fast response and hints. I’m gonna try. 😊 Von: paulvha <notifications@github.com> Gesendet: Montag, 13. April 2020 17:35 An: paulvha/SVM30_on_raspberry <SVM30_on_raspberry@noreply.github.com> Cc: hockenator <hockenator@gmail.com>; Author <author@noreply.github.com> Betreff: Re: [paulvha/SVM30_on_raspberry] Using the program (#1) Hi, thanks for the feedback. Make sure to read the SVM30.odt on how to compile and create an object and use it from the command line. For another project (scd30) I got some good advice how to integrate that with Python. I took the following from that project that you can tailor to your need : Stay Safe, Paul

…

_____ Received the following code from Aeolus1364 (credits to him) . import subprocess, shlex def run_command(command): process = subprocess.Popen(shlex.split(command), stdout=subprocess.PIPE) while True: output = process.stdout.readline() if output == '' and process.poll() is not None: break if output: print(output.strip()) rc = process.poll() return rc run_command("./scd30") It was part of an issue to integrate the scd30 program in Python and capture the output. To enable this the p_printf() changes were applied (version 3.0.2). p_printf() performs a ‘fflush(stdout)’ after each write which seems to be necessary for the integration to work well. Normally a line is detected after newline (which is performed as well in do_output()). His full code is posted on : https://github.com/Aeolus1364/SCD30_Python_Library — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <#1 (comment)> , or unsubscribe <https://github.com/notifications/unsubscribe-auth/AHSF3BIT3YYS6JMON2TS2MDRMMWKJANCNFSM4MHA4FKQ> . <https://github.com/notifications/beacon/AHSF3BKQBTQ3OMMPWURO26DRMMWKJA5CNFSM4MHA4FK2YY3PNVWWK3TUL52HS4DFVREXG43VMVBW63LNMVXHJKTDN5WW2ZLOORPWSZGOESEOJIY.gif>