Errno 5 by useing mlx90614.py

[MartenFrehse]

Hey, I tryed to use my mlx90614 but i had some issues by using it. Maybe someone can help?

So i tryed this code from you:

import mlx90614
from machine import I2C, Pin

i2c = I2C(scl=Pin(5), sda=Pin(4))
sensor = mlx90614.MLX90614(i2c)

print(sensor.read_ambient_temp())
print(sensor.read_object_temp())
if sensor.dual_zone:
print(sensor.object2_temp)

but i got this Output:

Traceback (most recent call last):
File "", line 4, in
TypeError: 'id' argument required

So i added an id = 0 and then i got:

Traceback (most recent call last):
File "", line 5, in
File "mlx90614.py", line 76, in init
OSError: [Errno 5] EIO

And i was not able to fix this until now. I would be thankful if someone would help me :)

[jmodrako]

I think that you have a wrong declaration of i2c. Try this:

    i2c = I2C(id=0, sda = Pin(4), scl = Pin(5), freq=100000)

[jmodrako]

Here you can find out working example of mine: https://github.com/jmodrako/astroclouds/blob/main/app/main.py

[mcauser]

Hey, @jmodrako, this library was originally written to work with the ESP8266 port and its software I2C.
It's been a few years now and I've pivoted all of my projects to the ESP32.

According to the docs, these are the latest I2C init patterns for ESP32.
https://docs.micropython.org/en/latest/esp32/quickref.html#software-i2c-bus

# software I2C
from machine import Pin, SoftI2C
i2c = SoftI2C(scl=Pin(5), sda=Pin(4), freq=100000)

# hardware I2C
from machine import Pin, I2C
i2c = I2C(0)
i2c = I2C(1, scl=Pin(5), sda=Pin(4), freq=400000)

I'll update the example code

Also, the datasheet mentions a requirement about the I2C frequency needing to be 100k or less

[MartenFrehse]

Sadly none of these examples where working. I am using an raspberry pi pico w and not an ESP32.

I alwasy get Errno5 or some other errors not even the "working example" of @jmodrako where working with my pico. I dont know what i am doing wrong. ^^

[MartenFrehse]

I have found my Problem ... I was not using the ADCs. After i switched that all was working just fine.

Code:
import mlx90614
import time
from machine import SoftI2C, Pin

i2c = SoftI2C(scl=Pin(27), sda=Pin(26), freq=100000)
sensor = mlx90614.MLX90614(i2c)

while True:
print(sensor.read_object_temp())
time.sleep_ms(500)

Thanks for your fast response!