inoscope
Not all finished, but sample rate seems real.
ADC Clock frequency are set to 4 MHz (this is 4x of max allowed value).
What performance can you get at that speed? I presume the input must be very
low impedance to charge the S/H cap at that rate.
It is seems that amplifier with 1k output impedance are sufficient.
First channel (green) connected to pwm pin 11 via resistor, second channel (yellow) - to pwm pin 3 directly.
PWM frequency - 3906 Hz. ADC speed - 2x100 ksamp/sec.
1k:
10k:
110k:
Now this amplifier used (R1 = 2.7 .. 110k, Q2 - BC547B), but op amp with rail-to-rail output may be better:
Trying to compile the last version inoscope-00.02.00 I got some errors with IDE 1.6.12
inoscope:225: error: 'setupTimer1' was not declared in this scope
inoscope:278: error: 'setDelay' was not declared in this scope
inoscope:331: error: 'setLevel' was not declared in this scope
inoscope:377: error: 'setStartCond' was not declared in this scope
inoscope:423: error: 'setInverted' was not declared in this scope
but these functions ARE declared in sketch. It seems that the error raise because these functions are called before declaration.
So I rearranged code and now it compiles and tested. IT works.
I have also noticed that COM port number is hardcoded in java sources so I had to change it.
inoscope.zip (6.74 KB)
Nice! K+
Thanks!