SBW 16-9: A Scope

Introduction

In this tutorial, we will learn how to convert a Xiao module with its ADC (Analog-to-Digital Converter) pins into an oscilloscope. This setup allows you to capture data quickly and visualize it using a serial plotter. This guide is relevant for electronics enthusiasts and developers looking to leverage low-cost hardware for rapid prototyping and data analysis.

Step 1: Gather Required Components

Before starting, ensure you have the following components:

• Xiao module (e.g., Xiao RP2040)
• Wires for connections
• Breadboard (optional for ease of setup)
• Computer with Arduino IDE installed
• USB cable for connecting the Xiao module to your computer

Step 2: Set Up Your Xiao Module

1. Connect the Xiao module to your computer using the USB cable.
2. Open the Arduino IDE on your computer.
3. Select the correct board type:
   • Go to Tools > Board and select "Seeeduino Xiao" or the appropriate model.
4. Install any necessary libraries:
   • Make sure you have the relevant libraries installed to work with the ADC and serial plotting.

Step 3: Write the Code for Data Acquisition

1. Create a new sketch in the Arduino IDE.
2. Initialize the ADC pins by defining which pin you will use for reading voltage:

   const int adcPin = A0; // Example ADC pin
   

3. Set up the serial communication:

   void setup() {
       Serial.begin(9600); // Start serial communication at 9600 baud
   }
   

4. Read the ADC value and send it to the serial plotter:

   void loop() {
       int adcValue = analogRead(adcPin); // Read ADC value
       Serial.println(adcValue); // Send value to serial plotter
       delay(100); // Delay for a short period before the next reading
   }
   

Step 4: Upload the Code

1. Connect the Xiao module to your computer (if not already connected).
2. Click the Upload button in the Arduino IDE to compile and upload the code to your Xiao module.
3. Monitor the upload process and ensure there are no errors.

Step 5: Visualize Data with Serial Plotter

1. Open the Serial Plotter:
   • In Arduino IDE, go to Tools > Serial Plotter.
2. Observe the data:
   • You should see the ADC values being plotted in real-time as the values are read from the ADC pin.

Conclusion

You have now successfully set up a Xiao module as a simple oscilloscope. By following these steps, you can capture and visualize analog signals quickly. This setup is useful for various applications, including signal analysis and sensor data monitoring.

Next steps could include experimenting with different input signals, modifying the code for more complex data handling, or integrating additional sensors to expand the capabilities of your oscilloscope.