i2c error ???? help

[micropythondevel]

from machine import Pin, SoftI2C
import time

class SensorCore:
    def __init__(self):
        # Usa I2C hardware (I2C0) en los pines SDA=16, SCL=17
        self.i2c =SoftI2C( scl=Pin(17), sda=Pin(16), freq=100000)
        time.sleep(1)  # pequeña espera tras inicializar
        print("I2C inicializado.")

        self._print_i2c_devices()
        self.sensors = {}

    def _print_i2c_devices(self):
       # i2c = SoftI2C( scl=Pin(17), sda=Pin(16), freq=100000)

        print('I2C SCANNER')
        devices = self.i2c.scan()

        if len(devices) == 0:
            print("❌ No se encontró ningún dispositivo I2C.")
        else:
            print('✅ Dispositivos I2C encontrados:', len(devices))
            for device in devices:
                print(" - Dirección I2C (hex):", hex(device))

monitor = SensorCore()

sorry ...because it doesn't work.... I'm going crazy

[DavesCodeMusings]

What are you seeing in the program output? Is it a problem of no devices being detected?

[micropythondevel]

Thanks for the answers, you will see with a simple scan of this type I have results

from machine import Pin, SoftI2C

# You can choose any other combination of I2C pins
i2c = SoftI2C(scl=Pin(16), sda=Pin(17))

print('I2C SCANNER')
devices = i2c.scan()

if len(devices) == 0:
  print("No i2c device !")
else:
  print('i2c devices found:', len(devices))

  for device in devices:
    print("I2C hexadecimal address: ", hex(device))

I get the result of

I2C SCANNER
i2c devices found: 3
I2C hexadecimal address:  0x23
I2C hexadecimal address:  0x29
I2C hexadecimal address:  0x76

Now I run the program of the sensor class

from machine import Pin, SoftI2C


import time

class SensorCore:
    def __init__(self):
        # Usa I2C hardware (I2C0) en los pines SDA=16, SCL=17
        self.i2c =SoftI2C( scl=Pin(17), sda=Pin(16), freq=100000)
        time.sleep(1)  # pequeña espera tras inicializar
        print("I2C inicializado.")

        self._print_i2c_devices()
        self.sensors = {}

    def _print_i2c_devices(self):
       # i2c = SoftI2C( scl=Pin(17), sda=Pin(16), freq=100000)

        print('I2C SCANNER')
        devices = self.i2c.scan()

        if len(devices) == 0:
            print("❌ No se encontró ningún dispositivo I2C.")
        else:
            print('✅ Dispositivos I2C encontrados:', len(devices))
            for device in devices:
                print(" - Dirección I2C (hex):", hex(device))

monitor = SensorCore()

and result

MPY: soft reboot
I2C inicializado.
I2C SCANNER
❌ No se encontró ningún dispositivo I2C.

all the same as with the same detection, same composition plate only changed the soft

[DavesCodeMusings]

Also, if you're building your own sensor class, I recently did this for a BH1750 ambient light sensor and documented the process. You can find it here: https://github.com/DavesCodeMusings/BH1750-MicroPython Maybe something in my notes will help.

[steveh127]

There is nothing wrong with the code, it runs correctly for me and it's very generic anyway.

You need to look to your hardware, do you have pullup resistors on the I2C lines? Are you sure SDA and SCL are correctly assigned?

[micropythondevel]

Thank you for the answer, if as I indicated above the font without using classes works when using classes does not work

[fdufnews]

Why use SoftI2C on a hardware I2C peripheral?
Simply import machine.I2C for much higher performance. Also, not sure sotfI2C handles open bus the same way as the hardware peripheral.
Are you sure you didn't mess up between GPIO numbers and pin numbers?

[micropythondevel]

Thanks for the answer, sometimes the internal I2C fails, that's why I use Softi2C, many times I have had failures in the sensors using the internal, which have been solved with the Softi2C

[steveh127]

You have sda and scl pins reversed in your Class compared to your basic test.

[micropythondevel]

It's true... God... I've seriously been doing this for almost two days and... how embarrassing

[micropythondevel]

thank´s very very tanks... although I don't understand why he didn't say anything about pin assignment

[fdufnews]

I don't understand why he didn't say anything about pin assignment

Probably because software I2C accepts any pair of GPIO. It 's up to you to wire it as you specify in the code.