Make an LED Blink at PWM Frequency

This section describes how to use VisionFive 2 or VisionFive 2 Lite's GPIO pins to make an LED blink at the PWM frequency through an example program with Python.

Hardware Setup

Perform the following to connect the LED to the 40-pin GPIO Header:

Connect GPIO50 pin of VisionFive 2 or VisionFive 2 Lite to the red line of the breadboard.
Set up the resistor as shown in the following figure.
Connect the longer leg of the LED to the red line of the breadboard.
Connect the shorter leg of the LED to the blue line of the breadboard.
Connect the GND pin of VisionFive 2 or VisionFive 2 Lite to the blue line of the breadboard.

Figure 1. Connect LED to the 40-Pin Header


LED	40-Pin GPIO Header
LED	Pin Number	Pin Name
Positive	22	GPIO50
Negative	6	GND

Run Demo Code

Perform the following steps on Debian of VisionFive 2 or VisionFive 2 Lite.

Locate the directory where the test code, pwm_led.py, exists.
1. Source into the PYthon3 Virtual Environment.
```
source ./myvenv/bin/activate
```
2. Install the dependency.
```
python3 -m pip install pillow
```
3. Get the directory where VisionFive.gpio exists.
```
python3 -m pip show VisionFive.gpio
```
  Note: The output depends on how the application is installed.
4. Enter the VisionFive.gpio directory.
```
cd <VisionFive.gpio directory>
```
5. Enter the sample-code directory.
```
cd ./VisionFive/sample-code/
```
Under the sample-code directory, execute the following command to run the demo code.
```
sudo python  pwm_led.py
```
Alternatively, you can also run the following command.
```
sudo python3  pwm_led.py
```
Note: For details about the source code, see pwm_led.py Source Code.
(Optional) Exit the Python3 Virtual Environment.
```
deactivate
```