The SunFounder Fusion HAT+ is a versatile add-on board designed for Raspberry Pi, offering a wide range of interfaces and sensors to simplify hardware integration. It features GPIO, I2C, and PWM capabilities, making it an ideal choice for prototyping, robotics, IoT applications, and educational projects. With its plug-and-play design, the Fusion HAT+ allows users to quickly connect and control external devices, sensors, and actuators.

• Robotics and motor control
• IoT (Internet of Things) projects
• Sensor integration and data acquisition
• Educational and prototyping purposes
• LED control and PWM-based applications

The SunFounder Fusion HAT+ connects directly to the Raspberry Pi's 40-pin GPIO header. Below is a description of the key pins and their functions:

1. Attach the Fusion HAT+ to the Raspberry Pi: Align the 40-pin GPIO header on the HAT+ with the Raspberry Pi's GPIO pins and press gently to secure the connection.
2. Power the Raspberry Pi: Connect the Raspberry Pi to a 5V power supply. The HAT+ will draw power directly from the Raspberry Pi.
3. Connect External Devices: Use the GPIO, I2C, or PWM pins to connect sensors, actuators, or other peripherals as needed.
4. Install Required Libraries: Install the SunFounder-provided Python libraries or other necessary software to control the HAT+.

• Voltage Levels: Ensure that connected devices operate at 3.3V or 5V to avoid damaging the HAT+ or Raspberry Pi.
• Library Installation: Use the official SunFounder libraries for seamless integration. Install them using the following command:

  pip install sunfounder-fusion
  

• Avoid Overloading: Do not exceed the current limits of the GPIO pins or the Raspberry Pi's power supply.
• Secure Connections: Ensure all connections are secure to prevent accidental disconnections during operation.

Below is an example Python script to read data from the onboard temperature sensor and control an LED using PWM:

import time
from sunfounder_fusion import FusionHAT

fusion = FusionHAT()

def read_temperature(): temp = fusion.get_temperature() # Get temperature in Celsius print(f"Temperature: {temp:.2f} °C") return temp

def control_led(brightness): # Brightness should be a value between 0 (off) and 100 (full brightness) fusion.set_pwm(0, brightness) # Set PWM channel 0 to the specified brightness

try: while True: # Read and display temperature read_temperature()

    # Gradually increase LED brightness
    for brightness in range(0, 101, 10):
        control_led(brightness)
        time.sleep(0.1)
    
    # Gradually decrease LED brightness
    for brightness in range(100, -1, -10):
        control_led(brightness)
        time.sleep(0.1)

except KeyboardInterrupt: print("Exiting program...") fusion.set_pwm(0, 0) # Turn off the LED

1. HAT+ Not Detected by Raspberry Pi

   • Solution: Ensure the HAT+ is securely connected to the GPIO header. Verify that the Raspberry Pi is powered on and the required libraries are installed.

2. I2C Devices Not Responding

   • Solution: Enable I2C on the Raspberry Pi by running sudo raspi-config and navigating to "Interfacing Options > I2C". Reboot the Raspberry Pi after enabling I2C.

3. PWM Output Not Working

   • Solution: Check the connected device's wiring and ensure the correct PWM channel is being used. Verify that the brightness value is within the valid range (0–100).

4. Temperature Sensor Reading Incorrect Values

   • Solution: Ensure the HAT+ is not exposed to extreme environmental conditions. Verify that the library is correctly installed and updated.

• Q: Can I use the Fusion HAT+ with other microcontrollers?
  A: The Fusion HAT+ is specifically designed for Raspberry Pi. However, you may adapt it for other microcontrollers with compatible GPIO and I2C interfaces, though this requires advanced knowledge.

• Q: How many devices can I connect via I2C?
  A: The I2C bus supports multiple devices, but ensure each device has a unique address to avoid conflicts.

• Q: Is the Fusion HAT+ compatible with Raspberry Pi Pico?
  A: No, the Fusion HAT+ is designed for Raspberry Pi models with a 40-pin GPIO header.

• Q: Can I power the HAT+ separately?
  A: No, the HAT+ draws power directly from the Raspberry Pi's GPIO header. Ensure the Raspberry Pi is adequately powered.