# Pimoroni Pico LiPo I2C Not Connecting
**URL:** https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284
**Category:** Product Questions
**Created:** [2 February 2023 05:22 UTC](https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284 "2023-02-02T05:22:29Z")
**Posts on this page:** 4
**Page:** 1
### Author:  [@Lochlan195576](https://forum.core-electronics.com.au/u/Lochlan195576)
#### Post date: [2 February 2023 05:22 UTC](https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284/1 "2023-02-02T05:22:29Z")
I have been trying to use a Pimoroni Pico LiPo with the latest 1.19.12 ([Releases · pimoroni/pimoroni-pico · GitHub](https://github.com/pimoroni/pimoroni-pico/releases)) MicroPython. However, I have been unable to get it to connect to my PiicoDev Buzzer Module or PiicoDev Magnetometer QMC6310.
When using:
```auto
from machine import Pin, I2C
i2c = I2C(0, sda=Pin(4), scl=Pin(5), freq=100000)
print( i2c.scan() )
```
The Piico will output the correct address. However, when running though either of the below guides I get the error “OSError: [Errno 5] EIO” when trying to initialise either sensor.
[Compass Guide](https://core-electronics.com.au/guides/raspberry-pi-pico/piicodev-magnetometer-qmc6310-guide-for-raspberry-pi-pico/)
[Buzzer Guide](https://core-electronics.com.au/guides/raspberry-pi-pico/piicodev-buzzer-module-raspberry-pi-pico-guide/)
Finally, I tried following some of the recommendations from this thread but was unable to make any progress. [Similar Issue Thread](https://forum.core-electronics.com.au/t/piicodev-tmp117-could-not-communicate/15647/9)
Any help would be amazing.
My Code:
```auto
from PiicoDev_QMC6310 import PiicoDev_QMC6310
from PiicoDev_Unified import sleep_ms # Cross-platform compatible sleep function
compass = PiicoDev_QMC6310(range=800) # Initialise the sensor with 800uT range
# compass = PiicoDev_QMC6310(0, sda=Pin(5), scl=Pin(4), freq=100000, range=800)
# Calibration recommended for best results.
compass.calibrate() # only need to calibrate once
# Optional: Declination is the difference between magnetic-north and true-north ("heading") and depends on location
# compass.setDeclination(12.3) # Found with: https://www.magnetic-declination.com/Australia/Newcastle/122944.html
while True:
heading = compass.readHeading() # get the heading from the sensor
if compass.dataValid(): # Rejects invalid data
heading = round(heading) # round to the nearest degree
print( str(heading) + "°") # print the data with a degree symbol
sleep_ms(100)
```
---
### Author:  [@Liam](https://forum.core-electronics.com.au/u/Liam)
#### Post date: [2 February 2023 05:34 UTC](https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284/2 "2023-02-02T05:34:32Z")
Welcome Lochlan!!
With all PiicoDev device drivers on the Pico it is assumed that the Expansion board is used where the default pins are 8/9 for SDA and SCL respectively.
Just like in your I2C scan code if you setup the magnetometer with the correct arguments it should work no worries
```auto
from PiicoDev_QMC6310 import PiicoDev_QMC6310
from PiicoDev_Unified import sleep_ms # Cross-platform compatible sleep function
from machine import Pin
compass = PiicoDev_QMC6310(bus=0, sda=Pin(4), scl=Pin(5), freq=100000,range=800) # Initialise the sensor with 800uT range
# compass = PiicoDev_QMC6310(0, sda=Pin(5), scl=Pin(4), freq=100000, range=800)
# Calibration recommended for best results.
compass.calibrate() # only need to calibrate once
# Optional: Declination is the difference between magnetic-north and true-north ("heading") and depends on location
# compass.setDeclination(12.3) # Found with: https://www.magnetic-declination.com/Australia/Newcastle/122944.html
while True:
heading = compass.readHeading() # get the heading from the sensor
if compass.dataValid(): # Rejects invalid data
heading = round(heading) # round to the nearest degree
print( str(heading) + "°") # print the data with a degree symbol
sleep_ms(100)
```
Let us know how you go!
Liam
---
### Author:  [@Lochlan195576](https://forum.core-electronics.com.au/u/Lochlan195576)
#### Post date: [2 February 2023 07:00 UTC](https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284/3 "2023-02-02T07:00:20Z")
Hi Liam,
Thank you so much I can now see a heading.
Unfortuantely, the calibration is quite far off with it limited to about 150-240 and no matter what I change it doesn’t want to get much better.
Looking at the raw data I got the values below when rotating the the sensor on a table and writing down the highest / lowest values I could manage.
Max Min
X - -410 -910
Y - 1530 1020
Z - 590 580
---
### Author:  [@Lochlan195576](https://forum.core-electronics.com.au/u/Lochlan195576)
#### Post date: [2 February 2023 09:32 UTC](https://forum.core-electronics.com.au/t/pimoroni-pico-lipo-i2c-not-connecting/16284/4 "2023-02-02T09:32:59Z")
Update:
It turns out just deleteing the calibration file and commenting out the line
`compass.calibrate() # only need to calibrate once`
got the compass within 2 degrees for me according to my phone.