arduino-scope

simple oscilloscope opengl using arduino as adc input through usb serial

• Arduino ADC to convert signal to digital, then serial
  • 115kbaud =~ 11.5kb/s ( need at least 2 byte for a freq detect, ie. max freq detectable about 11.5khz/2 )
• C++ opengl program to display waveform

keys

• space : pause display
• v/V : decrease/increase vertical factor
• h/H : decrease/increase horizontal factor
• up/down : delta vertical
• p : toggle point mode
• t : toggle text info

flash arduino

• pre: install arduino ide
• open sketch arduino-scope/arduino-scope.ino and flash firmware
  • tools/board ( eg. arduino nano )
  • tools/port
  • sketch upload

debug and execution

• pre: install vscode and suggested c++ extension asked when open the folder

code .

• breakpoints works thanks to gdb debugger ( -g switch to gcc - see Makefile )
• tune serial port in launch.json "args"
• hit F5 to start

dev notes

• an ethernet udp branch exists but no increase in freq rate because bottleneck still exists in ADC conversion

comparision

freq	sine	square
460hz
1.57khz
3.26khz
4.44khz	N/A