Recently I have been working on a way that Voltpeek software can be used even if you don't have the NS1 hardware. I have written some new firmware which uses the internal ADC on the RPi Pico instead of the external ADC and front end utilized by the NS1. This creates a rudimentary oscilloscope with just a Pico required on the hardware side. However, this obviously comes with some extreme limitations. First, the internal ADC can only sample at 500kS/s - a very low sample rate for an oscilloscope. Second, there is no front end, so the input signal is limited to 0V-3.3V with no ranges. Also, 0V is not present when the input is floating as it should be. I have only implemented auto trigger at this point, but normal trigger may be coming in the future as well as some front end options.

Below you can see a 100kHz square wave captured with this system: