IMAGES.md

#Sample Images

These are based on the 4.3 inch display.

#Puhbuttons

#Vertical sliders

#Horizontal sliders

#Rotary controls and displays

#Icon Controls

#Modal Dialog Box

#Plot Module

These images are of a proof-of-concept of using the Pyboard to generate a sine wave and using the ADC's to read the response of the network under test.

##Control Panel

##Bode Plot (Cartesian graph)

##Nyquist Plot (Polar graph)

To anyone interested in this project this was a lash-up with the network (a two pole passive filter) wired between a DAC output and an ADC input. A serious solution would require I/O electronics which I have designed but not implemented to date. The dynamic range could be substantially improved: 60dB was my target. As it stands the phase measurements are dubious when the amplitude is more than 40dB down. An auto-ranging amplifier is required.

Note to any MicroPython developers. Would that the firmware supported concurrent synchronous reading of two ADC's. This would enable phase to be read from an arbitrary pair of incoming signals. Phase measurements were only possible because the signal is of a known frequency, constant for the duration of each reading.