Do you have a Raspberry Pi? Add this shield and you will also own a digital storage oscilloscope! This shield offers all standard oscilloscope features and comes with the source code, so you can develop your own applications. As a bonus, you also get a 10-channel logic analyzer, a great tool to monitor digital signals.
Specifications:

1. oscilloscope:
   1. maximum sample rate : 1MS/s
   2. input amplifier bandwidth : 200kHz (-3dB)
   3. measurements can be performed up to: 100kHz
   4. input impedance : 100kohm // 20pF
   5. maximum input voltage: 30Vp (AC + DC)
   6. input coupling: AC+DC
   7. AD resolution: 8 bit
   8. record length: 800 samples
   9. run modes: Run, Single
   10. trigger level adjustable: in 254 steps
   11. timebase range: in 15 steps 5µs to 200ms/division
   12. input sensitivity range : in 6 steps, 100mV/division to 5V/division
   13. input sensitivity: 3mV display resolution
   14. time and Voltage markers readout
   15. frequency readout (through markers)
2. logic analyzer:
   1. Number of channels: 10
   2. record length: 10x800 samples
   3. maximum sample rate: 1MS/s
   4. max. input voltage: 5VDC

datasheet_vm205_uk.pdf

protocol_vm205.pdf

usermanual_vm205.pdf

vm205_src_pi_rev13.zip

module_diy_kit_guide.pdf

vm205_rpi4.zip