Omega2+: Battery Level with Power Dock 2

Fabrizio Codello

Hello, I have just tried the script in this post (from 3 years ago, I know) but it doesn't work anymore.

https://www.hackster.io/onion-corporation/onion-omega2-battery-level-and-current-date-indicator-451739

 python oled-display-battery.py
 Traceback (most recent call last):
   File "oled-display-battery.py", line 14, in <module>
     Vcurrent = float(output[-7:-2])
 ValueError: could not convert string to float: el:

Also if I try this on the command line, it doesn't work:

 ~# power-dock2 -p
 Error: Read failed
 /usr/bin/power-dock2: line 136: arithmetic syntax error
 (standard_in) 1: syntax error
 Error: Read failed
 /usr/bin/power-dock2: line 136: arithmetic syntax error
 (standard_in) 1: syntax error
 (standard_in) 1: syntax error
 (standard_in) 1: syntax error
 Battery Voltage Level:  V
 Battery Level Percent:  %

Could you help me? I'd like to show the battery level percentage on the OLED screen

Lazar Demin

@Fabrizio-Codello Just tested out the code with a Power Dock 2 and it still works.

Note that only the Power Dock 2 has an ADC circuit for detecting the battery level. The older Power Dock 1 does not have this same functionality - might be the cause of the issue you're seeing.

Marko Lukat

For the record, that's exactly the response you get when there is no ADC at the expected address (I2C: 0x4D). Which suggests tool and h/w don't match. What does i2cdetect -y 0 produce?

Fabrizio Codello

@Lazar-Demin said in Omega2+: Battery Level with Power Dock 2:

@Fabrizio-Codello Just tested out the code with a Power Dock 2 and it still works.

Note that only the Power Dock 2 has an ADC circuit for detecting the battery level. The older Power Dock 1 does not have this same functionality - might be the cause of the issue you're seeing.

@Lazar-Demin Ah, dang

@Marko-Lukat said in Omega2+: Battery Level with Power Dock 2:

For the record, that's exactly the response you get when there is no ADC at the expected address (I2C: 0x4D). Which suggests tool and h/w don't match. What does i2cdetect -y 0 produce?
root@Omega-67F5:~# i2cdetect -y 0

@Marko-Lukat This is the output:

      0  1  2  3  4  5  6  7  8  9  a  b  c  d  e  f
 00:          -- -- -- -- -- -- -- -- -- -- -- -- --
 10: UU -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 30: -- -- -- -- -- -- -- -- -- -- -- -- 3c -- -- --
 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
 70: -- -- -- -- -- -- -- --

I guess i have the first one and can't do much about it