https://quicktasks.ismael.casimpan.com/tags/raspberrypi/Recent content in raspberrypi on IT QuicktasksHugo -- gohugo.ioCopyright © 2018–2022, Ismael Casimpan Jr.; All Rights ReservedSun, 23 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/wireless-interface-txpower-error/Sun, 23 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/wireless-interface-txpower-error/ I turned-off my built-in wireless network interface using the command: 1iwconfig wlan0 txpower off Howerver, I can no longer turn-it back on. Logic says just change "off" to "on" but instead, I get this error. 1root@raspberrypi:/home/pi# iwconfig wlan0 txpower on 2Error for wireless request "Set Tx Power" (8B27) : 3GET failed on device wlan0 ; Input/output error. Current status of the wireless interface looks like: 1root@raspberrypi:/home/pi# iwconfig wlan0 2wlan0 IEEE 802.https://quicktasks.ismael.casimpan.com/post/check-low-voltage-in-raspberrypi/Mon, 17 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/check-low-voltage-in-raspberrypi/ When a pi gets under voltage below 4.63V (+/-5%), a thunderbolt icon is shown in the monitor like in https://www.raspberrypi.org/documentation/configuration/warning-icons.md It will then get throttled to get back to desired voltage. From command line, here's what you can use to check: 1vcgencmd get_throttled with some important information regarding low voltage: 0x50000 - throttled at least once due to low voltage 0x50005 - currently throttled due to low voltage Some more interesting information in https://raspberrypi.https://quicktasks.ismael.casimpan.com/post/basic-sony-tv-switch-on-or-off-using-hdmi-cec/Sat, 15 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/basic-sony-tv-switch-on-or-off-using-hdmi-cec/ Install needed package: 1sudo apt install cec-utils Check connected devices 1pi@raspberrypi:~ $ echo 'scan' | cec-client -s -d 1 2opening a connection to the CEC adapter... 3requesting CEC bus information ... 4CEC bus information 5=================== 6device #0: TV 7address: 0.0.0.0 8active source: no 9vendor: Sony 10osd string: TV 11CEC version: 1.4 12power status: on 13language: eng 141516device #1: Recorder 1 17address: 3.0.0.0 18active source: no 19vendor: Pulse Eight 20osd string: CECTester 21CEC version: 1.https://quicktasks.ismael.casimpan.com/post/headless-raspberrypi/Fri, 14 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/headless-raspberrypi/ Tested on a RaspberryPI 4 B 2GB. Setup Raspbian OS on the disk In a Mac for example, create a wpa_supplicant.conf in /Volumes/boot. Just replace with your country, ssid and psk 1country=US 2ctrl_interface=DIR=/var/run/wpa_supplicant GROUP=netdev 3update_config=1 45network={ 6ssid="NETWORK-NAME" 7psk="NETWORK-PASSWORD" 8} Add blank file ssh to /Volumes/boot Use the disk to boot the pi. More details in https://desertbot.io/blog/headless-raspberry-pi-4-ssh-wifi-setup Additional Info: https://www.raspberrypi.org/blog/a-security-update-for-raspbian-pixel/https://quicktasks.ismael.casimpan.com/post/berryserver/Mon, 10 Aug 2020 00:20:25 +0800https://quicktasks.ismael.casimpan.com/post/berryserver/ https://berryboot.alexgoldcheidt.com/