Jetson smart fan

an open source pwm fan program for nvidia jetson devices. It read the temperature from thermal and choose a suite pwm levelfor onboard pwm fan.
It's easy to customize the multiple pwm level with a simple json file.
You would need a 4 pin 5v pwm fan for this to make sense. a 3 pin fan wouldn't support the pwm, and will run with a default level.
Strongely Recommend to use with a 4A power supply.

jetson smart fan is implemented in c/c++ language and still under dev. Pull requests are welcome. it will power off the fan before halt or the thermal get a low level temperator automaticlly. The fan will be power on by default once plugin the charge.

Sync code

Using git and run

git clone https://github.com/kiah2008/jetson_smart_fan.git

Installation

Compile

you can build it with jetson nano directly after uploading the sources.
PS. you can also download cross-compile toolchain and using aarch64 gcc to compile and build the target.

suggest to compiling onboard.

Setup environment if cross-compile necessrary.

#!/bin/bash

#export SYS_ROOT=/mnt/nano_rootfs
export CROSS_ROOT=/home/kiah/worktmp/rootfs-nano
# toolchain extract path
export CROSS_TC_ROOT=/home/kiah/worktmp/aarch64_tc/gcc-linaro-7.3.1-2018.05-x86_64_aarch64-linux-gnu
export CROSS_COMPILE=${CROSS_TC_ROOT}/bin
export CC=${CROSS_COMPILE}/aarch64-linux-gnu-gcc
export CXX=${CROSS_COMPILE}/aarch64-linux-gnu-g++
export LD=${CROSS_COMPILE}/aarch64-linux-gnu-ld
export AR=${CROSS_COMPILE}/aarch64-linux-gnu-ar
export AS=${CROSS_COMPILE}/aarch64-linux-gnu-as
export RANLIB=${CROSS_COMPILE}/aarch64-linux-gnu-ranlib
export NVCC=${SYS_ROOT}/usr/local/cuda/bin/nvcc
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:$SYSROOT/usr/lib/aarch64-linux-gnu:$SYSROOT/lib/aarch64-linux-gnu:$SYSROOT/lib
export LC_ALL=C
export LD_LIBRARY_PATH=$LD_LIBRARY_PATH:${CROSS_TC_ROOT}/aarch64-linux-gnu/lib64:${CROSS_TC_ROOT}/aarch64-linux-gnu/sysroot/lib

using cmake to help the construction.
command as below:

mkdir build
cd build && cmake .. -DCMAKE_INSTALL_PREFIX=/etc/jetson_smart_fan
make

Install

It would install bin and conf into the path specificed during configure(aka CMAKE_INSTALL_PREFIX above) automaticlly.
ps. you may use sudo to fix the copy permission issue.

sudo make install

Configure

You can customize the PWM level in json, and see more details in config/pwm_fan.json.

    [
        {
            "temp_thsd": 25,
            "sample_interval": 1.0,
            "dev_level": 0
        },
        {
            "temp_thsd": 38.5,
            "sample_interval": 0.8,
            "dev_level": 45
        },
        {
            "temp_thsd": 42,
            "sample_interval": 0.5,
            "dev_level": 55
        },
        {
            "temp_thsd": 46,
            "sample_interval": 0.5,
            "dev_level": 90
        },
        {
            "temp_thsd": 55,
            "sample_interval": 0.25,
            "dev_level": 120
        },
        {
            "temp_thsd": 60,
            "sample_interval": 0.25,
            "dev_level": 150
        }
        ,
        {
            "temp_thsd": 100,
            "sample_interval": 0.25,
            "dev_level": 255
        }
    ]

Run

Start service

after install, the service unit will be under /lib/systemd folders. you can start the service by manual.

sudo systemctl daemon-reload
sudo systemctl start jetson_smart_fan

Start service during booting

sudo systemctl enable jetson_smart_fan

Check service status

kiah@kiah-jetson:/etc/jetson_smart_fan$ systemctl status jetson_smart_fan
● jetson_smart_fan.service - jetson_stats service
   Loaded: loaded (/lib/systemd/system/jetson_smart_fan.service; enabled; vendor preset: enabled)
   Active: active (running) since Mon 2021-05-31 15:55:30 CST; 32min ago
 Main PID: 16306 (jetson_smart_fa)
    Tasks: 2 (limit: 4177)
   CGroup: /system.slice/jetson_smart_fan.service
           └─16306 /etc/jetson_smart_fan/jetson_smart_fan -s -f /etc/jetson_smart_fan/pwm_fan.json

5月 31 15:55:30 kiah-jetson jetson_smart_fan[16306]: using rec {38.500000c,0.800000s,45} w/ temp 38.000000
5月 31 15:55:30 kiah-jetson jetson_smart_fan[16306]: using dev level 45
5月 31 16:04:58 kiah-jetson jetson_smart_fan[16306]: using rec {42.000000c,0.500000s,60} w/ temp 40.000000
5月 31 16:04:58 kiah-jetson jetson_smart_fan[16306]: using dev level 60
5月 31 16:07:00 kiah-jetson jetson_smart_fan[16306]: using rec {38.500000c,0.800000s,45} w/ temp 38.000000
5月 31 16:07:00 kiah-jetson jetson_smart_fan[16306]: using dev level 45
5月 31 16:24:27 kiah-jetson jetson_smart_fan[16306]: using rec {42.000000c,0.500000s,60} w/ temp 40.000000
5月 31 16:24:27 kiah-jetson jetson_smart_fan[16306]: using dev level 60
5月 31 16:28:06 kiah-jetson jetson_smart_fan[16306]: using rec {38.500000c,0.800000s,45} w/ temp 38.000000
5月 31 16:28:06 kiah-jetson jetson_smart_fan[16306]: using dev level 45

SOURCE CODE CONTRIBUTION

Your contribution to jetson smart fan Project is much appreciated.
Please feel free to open issues or pull requests on this Repository.
If you find this tool useful, you can support me with a star.