9. Input - Cooper Cumbus & Tyler Russel¶
Tasks¶
- Probe an input device(s)’s analog levels and digital signals
- Document your work on the group work page and reflect on your individual page what you learned
Step Response¶
We made a board designed around a XIAO ESP32C3 that uses step responce. Last years group did something similar so we decided to try and design one aswell. Heres what it looked like
Input Analog Levels¶
The goal of using the oscilloscope with the Analog function was to see the change in the values received from the two copper board that were transmitting the Rx and Tx signals to the RP 2040. We wanted to monitor how the values changed when we created the connected with our fingers between the two boards. We connected the oscilloscope probe to the output pin on the board and the ground clip to the ground pin.
On the screen it looked like two waves, one very very straight then tapered off, the other was extremely jumpy and moving all over the place representing the sensitive copper boards and the changing values. That is why we used a threshold to only activate the LED when only the human connection creates a high enough value to activate the LED. This is seen when Cooper touches both boards at the same time and the irregular wave becomes much more uniform and closer to the first wave.
The oscilloscope was a very useful tool in understanding Analog values and the thresholds that goes with it.
Input Digital Signals - Cooper¶
When I run a step response and look at it on the oscilloscope, I see the voltage suddenly jump from low to high, like a square edge. If the board responds cleanly, the line goes straight up. But sometimes there’s a slight curve, overshoot, or small wobbles—that shows delay, ringing, or noise in the signal. The flat parts mean the voltage is holding steady, and the sharp changes show how fast the board reacts.