Raspberry PI 4B Tips

Use ssh to connect terminal session to PI

You can ssh to connect to your raspberry pi, all you need to know is the IP address,

The default user is pi, and the password is raspberry.


Remote Desktop connection to PI

You can use VNC to remote connect to your PI, using your computer Keyboard and screen to see and control a virtual desktop. 


Common VNC errors: https://www.web3us.com/how-guides/vnc-connection-raspberry-pi-unknown

PI 4B pinouts

Raspberry Pi 4 GPIO pinout

Pi 1B pinouts

Pi 1B Pinout GPIO

Show Raspberry Pi GPU and ARM CPU temperature

Monitory CPU speed and temp Sample output

$ ./temp.sh 
Date   Time    GPU-C  GPU-F      CPU-C  CPU-F    CPU      Core    Vcore
Jul 29 18:46   80.0'C 176.0'F    80.8'C 177.4'F  1500MHz  500MHz  0.8455V
Jul 29 18:46   79.0'C 174.2'F    79.8'C 175.6'F  1500MHz  500MHz  0.8455V
Jul 29 18:47   81.0'C 177.8'F    81.8'C 179.2'F  1500MHz  500MHz  0.8455V
Edit a file temp.sh and add the following:
DisplayHeader="Date   Time    GPU-C  GPU-F      CPU-C  CPU-F    CPU      Core    Vcore"
while true ; do
  let ++Counter
  if [ ${Counter} -eq 21 ]; then
        echo -e "${DisplayHeader}"

  Clockspeed=$(vcgencmd measure_clock arm | awk -F"=" '{printf ("%0.0f",$2/1000000); }' )
  Corespeed=$(vcgencmd measure_clock core | awk -F"=" '{printf ("%0.0f",$2/1000000); }' )
  CoreVolt=$(vcgencmd measure_volts | cut -f2 -d= | sed 's/000//')
  gpu=$(/opt/vc/bin/vcgencmd measure_temp | awk -F "[=\']" '{print $2}') 
# use the above line without path if above fails like this
# gpu=$(vcgencmd measure_temp | awk -F "[=\']" '{print $2}')
  cpu=$(echo "$cpu / 100 * 0.1" | bc)
  cpuf=$(echo "(1.8 * $cpu) + 32" |bc)
  gpuf=$(echo "(1.8 * $gpu) + 32" |bc)
  echo -e "$(date '+%b %d %H:%M')   ${gpu}'C ${gpuf}'F    ${cpu}'C ${cpuf}'F  $(printf '%4s' ${Clockspeed})MHz $(printf '%4s' ${Corespeed})MHz  ${CoreVolt}"
  sleep 10

Note, if you get the error: 

./temp.sh: line 16: bc: command not found

Then you need to install the command line calculator bc with the following:

#sudo apt-get install bc

Getting information

To show the Raspberry CPU model

$cat /proc/cpuinfo
processor    : 0
model name    : ARMv6-compatible processor rev 7 (v6l)
BogoMIPS    : 697.95
Features    : half thumb fastmult vfp edsp java tls 
CPU implementer    : 0x41
CPU architecture: 7
CPU variant    : 0x0
CPU part    : 0xb76
CPU revision    : 7

Hardware    : BCM2835
Revision    : 000e
Serial        : 00000000a6245681
Model        : Raspberry Pi Model B Rev 2

To show the Raspberry OS version

cat /etc/os-release
PRETTY_NAME="Raspbian GNU/Linux 10 (buster)"
NAME="Raspbian GNU/Linux"
VERSION="10 (buster)"

To show the Raspberry Firmware version on model 4

$sudo rpi-eeprom-update
BOOTLOADER: up to date
   CURRENT: Tue 02 Aug 2022 03:55:05 PM UTC (1659455705)
    LATEST: Tue 02 Aug 2022 03:55:05 PM UTC (1659455705)
   RELEASE: stable (/lib/firmware/raspberrypi/bootloader/stable)
            Use raspi-config to change the release.

  VL805_FW: Dedicated VL805 EEPROM
     VL805: up to date
   CURRENT: 000138a1
    LATEST: 000138a1

To upgrade the Raspberry Firmware version on model  4

$sudo rpi-eeprom-update -d -a

To show the Raspberry Firmware version on model  1,2,3

$ /opt/vc/bin/vcgencmd version
Dec  1 2021 15:07:06 
Copyright (c) 2012 Broadcom
version 71bd3109023a0c8575585ba87cbb374d2eeb038f (clean) (release) (start)