CSI鏡頭預設是 csi://0
翻轉鏡頭 要下 --input-flip=參數(horizontal ,vertical)
USB camera通常是 /dev/video0 或 /dev/video0
PWM 4 PINS
We can refer to the tutorial website https://blog.cavedu.com/2019/10/04/nvidia-jetson-nano-fan/
If u want to turn on / off the PWM fan, u can use the following command.
ON :
sudo sh -c 'echo 255 > /sys/devices/pwm-fan/target_pwm'
OFF :
sudo sh -c 'echo 0 > /sys/devices/pwm-fan/target_pwm'
create a file, it's name is rc.local. if the file is already exit, just edit it.
cd /etc
sudo touch rc.local #create a file named rc.local
sudo chmod u+x rc.local
sudo vim rc.local
after entering edit mode, use command 'I' to edit
sleep 10
sudo /usr/bin/jetson_clocks
sudo sh -c 'echo 255 > /sys/devices/pwm-fan/target_pwm'
then press ESC and input ':wq'
sudo reboot now
You will need a 5V PWM fan for this to make any sense.
I used the Noctua nf-a4x20 5V PWM fan.
Additionally, I recommend you use the barrel jack with a 4A power supply.
$ git clone https://github.com/Pyrestone/jetson-fan-ctl.git
$ cd jetson-fan-ctl
$ ./install.sh
open /etc/automagic-fan/config.json with your favorite editor (I'm using nano):
sudo nano /etc/automagic-fan/config.json
you will find the following lines:
{
"FAN_OFF_TEMP":20,
"FAN_MAX_TEMP":50,
"UPDATE_INTERVAL":2,
"MAX_PERF":1
}
FAN_OFF_TEMP is the temperature (°C) below which the fan is turned off.
FAN_MAX_TEMP is the temperature (°C) above which the fan is at 100% speed.
The script interpolates linearly between these two points.
UPDATE_INTERVAL tells the script how often to update the fan speed (in seconds).
MAX_PERF values greater than 0 maximize system performance by setting the CPU and GPU clock speeds to the maximum.
You can use either integers (like 20) or floating point numbers (like 20.125) in each of these fields.
The temperature precision of the thermal sensors is 0.5 (°C), so don't expect this to be too precise.
Any changes in the script will be will be applied after the next reboot.
You can run
sudo service automagic-fan restart
to apply changes immediately.
If you suspect something went wrong, please check:
sudo service automagic-fan status
cd /etc
sudo touch rc.local #create a file named rc.local
sudo chmod u+x rc.local
sudo vim rc.local
after entering edit mode, use command 'I' to edit
sleep 10
sudo /usr/bin/jetson_clocks
sudo service automagic-fan start
then press ESC and input ':wq'
sudo reboot now