Lightning Bolt (Under-Voltage Warning) on Raspberry Pi

If a lightning bolt image appears in the top-right corner of the screen, it means Raspberry Pi is not getting enough voltage (4.65V according to this forum post). To prevent it from showing up, there are two options.   1) Replace Power Supply and/or Cable (Recommended) In most cases, it’s due to the power supply and/or… Continue reading “Lightning Bolt (Under-Voltage Warning) on Raspberry Pi”

Disabling Screen Sleep on Raspberry Pi

By default the screen goes to sleep after some minutes of inactivity. It can be disabled by editing configuration file. Here is the steps. 1. Open /etc/lightdm/lightdm.conf file. sudo nano /etc/lightdm/lightdm.conf 2. Look for the line starts “xserver-command” under “[Seat:*]” section and modify as below: xserver-command=X -s 0 -dpms 3. Reboot the system. sudo reboot… Continue reading “Disabling Screen Sleep on Raspberry Pi”

Writing Raspbian OS Image to SD Card on Linux

This is how to write Raspbian OS image to SD card by using Linux command line. Since the steps below use “dd” command which may cause damage to your system if used wrongly, please be careful about the usage.   Contents – Assumptions – Steps 1. Download Raspbian OS Image 2. Find device name of… Continue reading “Writing Raspbian OS Image to SD Card on Linux”