3
This is an exercise in futility!
Disabling devices will make very little difference in power usage, which is mainly determined by processor load.
About the ONLY device which will have any affect is WiFi.
You should consider a Pi3A+ which has lower consumption and no USB hub or Ethernet.
2
For other people looking for this issue - solution in my case was hidden in video configuration file. When using the HDMI to VGA converter boot configuration file (/boot/config.txt) must contain proper entry of hdmi_group and hdmi_mode in order to work with every startup.
2
We do not know anything about your setup. The simplest way is to start a service on boot up that just delays 10 minutes (e.g. sleep 600) and then disables wifi. Here an idea for a generic systemd Unit file but not tested:
[Unit]
Description=Delay terminate wifi
After=multi-user.target
[Service]
ExecStart=/bin/sleep 600
ExecStop=/sbin/wpa_cli -iwlan0 ...
1
As far as I know, you can not disable only one USB. When you turn USBs power off, also the Ethernet port turned off. I don't know if there is a way to disable USB/Ethernet in config.txt, but in cmd line you can do it with:
echo '1-1' |sudo tee /sys/bus/usb/drivers/usb/unbind
To enable the ports use:
echo '1-1' | sudo tee /sys/bus/usb/drivers/usb/bind
...
1
Just wanted to add on to Milliways' response.
On first boot of Raspbian, there is an auto expansion task that is run.
Within that task, it updates the disk id.
fix_partuuid() {
DISKID="$(fdisk -l "$ROOT_DEV" | sed -n 's/Disk identifier: 0x\([^ ]*\)/\1/p')"
sed -i "s/${OLD_DISKID}/${DISKID}/g" /etc/fstab
sed -i "s/${OLD_DISKID}/${DISKID}/" /boot/...
1
No rep to comment yet, so this goes as answer.
This is generally a bad idea to use the same SD card swapping between devices, as each of them has its own configuration - despite the same system. Devices differ by on-board components id, or even might be different due to newer revision of board. I own 2 rPi 1 B+ and swapping cards is impossible due to errors ...
1
The default RealVNC installation shows the monitor screen, so it will show the display of whoever is using this.
You can start a virtual desktop and can run multiple instances.
The RealVNC documentation explains how to do this.
See https://www.raspberrypi.org/documentation/remote-access/vnc/README.md
To create and connect to a virtual desktop:
On your ...
1
According to the forum topic posted here, the newest version of Raspbian (Buster) had an option added to support the Pi 4 that broke component video out. Downgrading my Raspbian version and using a bare install solved this issue for me.
1
Simple answer is no.
Longer answer is that Raspbian is basically a Debian based OS optimized for Raspberry Pi devices only. If you wish to have similar experience to this system, there are several solutions for Android phones to run virtualized Debian environment or even installing it as secondary system - though finding proper drivers might be an issue ...
1
What are you doing with this Pi Zero ?
If you're doing some project without connection to internet or just locally (home automation, etc) I would say no. If no big bug endangering your project has been corrected it may no be worth the time and effort required to put again in place your project.
Now, if your Zero is hosting some web server, everything ...
1
Here is a pigpio Python example. You use the same logic in any programming language.
In practice you would use GPIO callbacks on level change rather than polling.
The time.sleep(0.01) is kind to other programs which want to run.
#!/usr/bin/env python
import time
import pigpio
GPIO=4
pi = pigpio.pi()
if not pi.connected:
exit()
count=0
last_state =...
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