PiJuice Zero: Unable to connect to device Error on Rpi Zero WH, OS: DietPI v8.12.1

[cserl]

5000mAh battery is connected. The two color Led is blinking Green/Blue. DietPI version 8.12.1 (recently upgraded from 8.0.2)

dietpi-config advanced options: I2C State: On I2C frequency 100 kHz Spi state: On

1. start pijuice_cli
2. select the "General" menu entry
3. Error message: "Unable to connect to device"

root@DietPi:~# i2cdetect -y 1 0 1 2 3 4 5 6 7 8 9 a b c d e f 00: -- -- -- -- -- -- -- -- 10: -- -- -- -- 14 -- -- -- -- -- -- -- -- -- -- -- 20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- 60: -- -- -- -- -- -- -- -- 68 -- -- -- -- -- -- -- 70: -- -- -- -- -- -- -- --

Running pijuice_cli with status:

root@DietPi:~# pijuice_cli

Traceback (most recent call last): File "/usr/bin/pijuice_cli.py", line 2087, in loop.run() File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 287, in run self._run() File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 385, in _run self.event_loop.run() File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 790, in run self._loop() File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 827, in _loop self._watch_files[fd]() File "/usr/lib/python3/dist-packages/urwid/raw_display.py", line 416, in wrapper = lambda: self.parse_input( File "/usr/lib/python3/dist-packages/urwid/raw_display.py", line 515, in parse_input callback(processed, processed_codes) File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 412, in _update self.process_input(keys) File "/usr/lib/python3/dist-packages/urwid/main_loop.py", line 513, in process_input k = self._topmost_widget.keypress(self.screen_size, k) File "/usr/lib/python3/dist-packages/urwid/container.py", line 598, in keypress return self.top_w.keypress(self.top_w_size(size, File "/usr/lib/python3/dist-packages/urwid/container.py", line 1626, in keypress key = self.focus.keypress(tsize, key) File "/usr/lib/python3/dist-packages/urwid/container.py", line 2316, in keypress key = w.keypress((mc,) + size[1:], key) File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 622, in keypress return self._original_widget.keypress(maxvals, key) File "/usr/lib/python3/dist-packages/urwid/listbox.py", line 968, in keypress key = focus_widget.keypress((maxcol,),key) File "/usr/lib/python3/dist-packages/urwid/decoration.py", line 622, in keypress return self._original_widget.keypress(maxvals, key) File "/usr/lib/python3/dist-packages/urwid/wimp.py", line 543, in keypress self._emit('click') File "/usr/lib/python3/dist-packages/urwid/widget.py", line 461, in _emit signals.emit_signal(self, name, self, args) File "/usr/lib/python3/dist-packages/urwid/signals.py", line 265, in emit result |= self._call_callback(callback, user_arg, user_args, args) File "/usr/lib/python3/dist-packages/urwid/signals.py", line 295, in _call_callback return bool(callback(args_to_pass)) File "/usr/bin/pijuice_cli.py", line 1994, in item_chosen callback() File "/usr/bin/pijuice_cli.py", line 209, in init self.main() File "/usr/bin/pijuice_cli.py", line 269, in main status_args = self.get_status() File "/usr/bin/pijuice_cli.py", line 215, in get_status status = pijuice.status.GetStatus().get('data', {}) AttributeError: 'NoneType' object has no attribute 'status'

Checking root@DietPi:~# ls -l /dev/i2c* crw-rw---- 1 root i2c 89, 1 Dec 30 22:10 /dev/i2c-1

Checking root@DietPi:~# ls -l /usr/bin/pijuice_cli* lrwxrwxrwx 1 root root 22 Dec 30 10:41 /usr/bin/pijuice_cli -> /usr/bin/pijuice_cli32 -rw-r--r-- 1 pijuice pijuice 101552 May 16 2021 /usr/bin/pijuice_cli.py -rwsr-xr-x 1 pijuice pijuice 9096 Dec 17 2018 /usr/bin/pijuice_cli32 -rwsr-xr-x 1 pijuice pijuice 14872 Jan 30 2022 /usr/bin/pijuice_cli64

Please advise how to resolve.

[tvoverbeek]

Try to run this simple python script in a terminal window:

from pijuice import PiJuice

pj=PiJuice(1, 0x14)
ret = pj.status.GetStatus()
print(ret)

See if you get any error message that might help

[cserl]

Thank you for the fast reply. I am powering the setup via official rpi power supply plugged in to the pi zero.

root@DietPi:/usr/bin/python# python3 pijuicezerotest.py

{'data': {'isFault': False, 'isButton': False, 'battery': 'CHARGING_FROM_5V_IO', 'powerInput': 'NOT_PRESENT', 'powerInput5vIo': 'PRESENT'}, 'error': 'NO_ERROR'}

[cserl]

And after having executed the script from the /usr/bin/python directory, I have tried once again to run pijuice_cli from the same directory. Strangely enough, now it seems to work. Why does it work now and why did it not work before? In other words what can be the potential risk

[tvoverbeek]

I do not know the internals of DietPi. Does it by chance have several versions of python (e.g. python2.x, python3.9, python3.10) installed? Maybe it did not find the i2c module (smbus) and hence could not communicate with the Pijuice, How do you install Raspberry Pi Os packages in DietPi?

[cserl]

As far as I know DietPi is not an own Operating System or Distribution. DietPi is a bundle of scripts on top of a standard Debian installation. Depending on my SBC, DietPi is using different base images. Mainly used images are Armbian, Meveric or as in my case: for Rpi boards Raspberry OS.

[cserl]

With the help of dietpi-software config tool I have installed following software packages: -Domoticz -WiringPi GPIO library -OpenSSH Server -Python3 runtime system, package installer -Python3 Rpi.GPIO

on cli I have installed: apt-get install pijuice-base

After unsuccessful test result I have installed Pijuice from the dietpi-software config tool.

[cserl]

Firmware version is 5. Is there a firmware release history? Does it make sense to update? Was it possibly a power up sequence / insufficient battery load level issue? What is the minimum load level requirement for the battery based operation?

[tvoverbeek]

For firmware and software release history see https://github.com/PiSupply/PiJuice/blob/master/Software/Source/debian-base/changelog This file is also part of the installed package. Look in /usr/share/doc/pijuice-base (at least in RasPi OS). I do not have any data on minimum battery level. With a powerbank you can have a minimum load issue, since they are designed for phone charging.