Pico Web oscilloscope

Previous project

In my previous project, I built a Web Oscilloscope using the XIAO-RP2040. However, I encountered an issue with power supply because it didn't support Power over Ethernet (PoE), so I had to provide separate power for it.

https://www.hackster.io/alan43/the-world-s-smallest-oscilloscope-97bd5e

Start

I happen to have a Pico board and a compatible PoE board, so I'm going to proceed with the previous project with this board.

I created the setup on the Pico board by connecting it as follows: I only used the Analog 0 pin.

I made the probe using simple materials that were readily available nearby.

To calculate the voltage due to voltage division, I attached resistors in order to perform the voltage calculations.

The resistors used, 36k and 3.6k, create a voltage divider that allows for analog perception at approximately 1/10 of the original voltage.

Once everything is connected, it will take on a form similar to this. Since it is PoE-enabled, it will operate simply by connecting Ethernet without the need for a separate power supply.

Now it's time to verify the operation. You will test the module to see if it accurately measures the voltage using a power supply.

I apologize for the confusion. You have set the module to read voltage in the range of 0 to 40V. You have made the decision that this range is suitable considering the limitations of the ADC's resolution. The resolution is set at 0.01V. Thank you for clarifying.

Apologies for the confusion. You have connected the power supply. The power supply you have can go up to a maximum of 31.5V, which is suitable for conducting the test.

Finish

It's working very well.