Python Library for Raspberry Pi

[cpietsch]

It would be great to have a Python Library for Raspberry Pi. On the Grove Website it says: "To Do" for Platform Raspberry Pi.

Any news on that topic ?

[fdiazsmith]

Or at least a proper documentation of the I2C registers?

[cpietsch]

after fiddling with the bme680 and its software, I doubt that without proper computing these sensors won't yield plausible results

[elloza]

Has anyone made any progress on this? I'm looking for how to port it but it's a bit difficult without the register information.

I have only found the following but it does not seem to work: Python port

[elloza]

This is what I have managed so far by looking at the Arduino code but I am not able to make it work.

import time
import smbus2
import struct

class GAS_GMXXX:
    GM_102B = 0x01
    GM_302B = 0x03
    GM_502B = 0x05
    GM_702B = 0x07
    CHANGE_I2C_ADDR = 0x55
    WARMING_UP = 0xFE
    WARMING_DOWN = 0xFF
    GM_VERF = 3.3
    GM_RESOLUTION = 1023

    def __init__(self, bus, address):
        self.bus = smbus2.SMBus(bus)
        time.sleep(1)
        self.address = address
        self.is_preheated = False

    def write_byte(self, cmd):
        self.bus.write_byte(self.address, cmd)

    def read_32(self):
        data = self.bus.read_i2c_block_data(self.address, 0, 4)
        return struct.unpack('>I', bytes(data))[0]

    def preheat(self):
        self.write_byte(GAS_GMXXX.WARMING_UP)
        self.is_preheated = True

    def un_preheat(self):
        self.write_byte(GAS_GMXXX.WARMING_DOWN)
        self.is_preheated = False

    def get_gm102b(self):
        if not self.is_preheated:
            self.preheat()
        self.write_byte(GAS_GMXXX.GM_102B)
        return self.read_32()

    def get_gm302b(self):
        if not self.is_preheated:
            self.preheat()
        self.write_byte(GAS_GMXXX.GM_302B)
        return self.read_32()

    def get_gm502b(self):
        if not self.is_preheated:
            self.preheat()
        self.write_byte(GAS_GMXXX.GM_502B)
        return self.read_32()

    def get_gm702b(self):
        if not self.is_preheated:
            self.preheat()
        self.write_byte(GAS_GMXXX.GM_702B)
        return self.read_32()

    def change_address(self, new_address):
        self.write_byte(GAS_GMXXX.CHANGE_I2C_ADDR)
        self.write_byte(new_address)
        self.address = new_address

    def calc_vol(self, adc):
        return adc * self.GM_VERF / (self.GM_RESOLUTION * 1.0)

Any help would be welcome.

Thank you very much!

[elloza]

@cpietsch or someone, please, could you test if my code works with the sensor if you have one?

I am trying to test with the sensor I have but the example in Arduino always gives me all the values at 0.

The same thing that happens to this user:

SeeedStudioForum

I don't understand anything, I don't know if the sensor directly doesn't work or what happens.

[atsclct]

Try code under: https://github.com/atsclct/atsc_sensors two versions of python code work for raspberry pi and pico respectively.

[brmmm3]

Hi,

thank you very much for! I'll have a look into this project.

Best regards,

Martin

Am Fr., 17. März 2023 um 22:32 Uhr schrieb atsclct @.***

:

Try code under: https://github.com/atsclct/atsc_sensors two versions of python code work for raspberry pi and pico respectively.

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