Dedicated 4020 Cooling Fan for Jetson Nano

Dedicated 4020 Cooling Fan for Jetson Nano

Overview

The Dedicated 4020 Cooling Fan is a high-performance cooling solution designed specifically for the NVIDIA Jetson Nano module. This fan is optimized to provide efficient heat dissipation, ensuring reliable operation and optimal performance of the Jetson Nano in demanding applications.

Technical Specifications

Fan Type: 4020 (40mm x 20mm)
 Operating Voltage: 5V
 Current Draw: 250mA
 Speed: 5500 RPM
 Airflow: 12.3 CFM
 Noise Level: 28 dBA
 Connector: 2-pin JST PH (compatible with Jetson Nano)

Using the Dedicated 4020 Cooling Fan with Jetson Nano

To use the Dedicated 4020 Cooling Fan with the Jetson Nano, you'll need to connect the fan to the Jetson Nano's fan header and configure the fan control in your application.

Example 1: Controlling the Fan using Jetson Nano's GPIO

In this example, we'll demonstrate how to control the fan using the Jetson Nano's GPIO pins. We'll use the Jetson Nano's GPIO library to set the fan's speed.

```python
import RPi.GPIO as GPIO
import time

# Set up GPIO mode
GPIO.setmode(GPIO.BCM)

# Define the fan's GPIO pin
FAN_PIN = 18

# Set the fan pin as an output
GPIO.setup(FAN_PIN, GPIO.OUT)

try:
    while True:
        # Set the fan to 50% speed ( approx. 2750 RPM)
        GPIO.output(FAN_PIN, GPIO.HIGH)
        time.sleep(0.5)
        GPIO.output(FAN_PIN, GPIO.LOW)
        time.sleep(0.5)

except KeyboardInterrupt:
    # Clean up GPIO on exit
    GPIO.cleanup()
```

Example 2: Controlling the Fan using Jetson Nano's Systemd Service

In this example, we'll demonstrate how to control the fan using a systemd service on the Jetson Nano. We'll create a service that sets the fan's speed based on the system's temperature.

Create a new file `/etc/systemd/system/jetson-fan.service` with the following contents:
```bash
[Unit]
Description=Jetson Fan Controller
After=sysinit.target

[Service]
User=root
ExecStart=/usr/bin/python /home/jetson/fan_controller.py
Restart=always

[Install]
WantedBy=multi-user.target
```
Create a new file `/home/jetson/fan_controller.py` with the following contents:
```python
import os
import time
import subprocess

while True:
    # Get the system temperature
    temp = subprocess.check_output(['cat', '/sys/class/thermal/thermal_zone0/temp'])
    temp = int(temp) / 1000.0

# Set the fan speed based on the temperature
    if temp > 50:
        # Set the fan to 100% speed
        os.system('gpio write 1 1')
    elif temp > 40:
        # Set the fan to 50% speed
        os.system('gpio write 1 0.5')
    else:
        # Set the fan to 0% speed
        os.system('gpio write 1 0')

time.sleep(1)
```
Note: Make sure to replace `/home/jetson/fan_controller.py` with the actual path to your Python script.

Example 3: Controlling the Fan using Jetson Nano's device tree overlay

In this example, we'll demonstrate how to control the fan using a device tree overlay (DTO) on the Jetson Nano. We'll create a DTO that sets the fan's speed based on the system's temperature.

Create a new file `/boot/dto/overlay/fan.dtbo` with the following contents:
```dts
/dts-v1/;
/plugin/;

/ {
    compatible = "nvidia,jetson-nano";
    fragment@0 {
        target = <&gpio>;
        __overlay__ {
            fan {
                gpio-fan,speed-mode = <1>;
                gpio-fan,pwm-period = <50000>;
                gpio-fan,default-speed = <50>;
            };
        };
    };
};
```
Update the `dtoverlay` line in your `/boot/extlinux/extlinux.conf` file to include the new overlay:
```bash
dtoverlay=fan
```
Reboot the Jetson Nano to apply the changes.

These examples demonstrate how to control the Dedicated 4020 Cooling Fan using various methods, including Python scripts, systemd services, and device tree overlays. You can modify and extend these examples to suit your specific application requirements.