Share My Creation Microphone oscilloscope

Low frequency oscilloscope. The bandwidth is about 30 to 5000 Hz, the narrow bandwidth and input filter makes the use limited. The mic ADC sends packets of 2048 bytes and 60 bytes are used to draw the trace.
Input is to the microphone socket. Input voltage divider allows signals of 5V P-P. Alternative way is to use an existing headset and connect the input in place of the mic. When no input plugged in the scope shows the signal from the internal mic. The 18-22 ohm resistors simulate speakers, it lets the device switch to external mic.

8.1.2023 The layout scaling was corrected and runtime permission was added so it can work on newer phones.

 

[Beja]

Low frequency oscilloscope. The bandwidth is about 30 to 5000 Hz, the narrow bandwidth and input filter makes the use limited. The mic ADC sends packets of 2048 bytes and 60 bytes are used to draw the trace.
Input is to the microphone socket. Input voltage divider allows signals of 5V P-P. Alternative way is to use an existing headset and connect the input in place of the mic. When no input plugged in the scope shows the signal from the internal mic. The 18-22 ohm resistors simulate speakers, it lets the device switch to external mic.

View attachment 95778

View attachment 95779

Thanks moty22
How to display the waveform on the screen? is there an App or project somewhere?

 

[moty22]

Thanks moty22
How to display the waveform on the screen? is there an App or project somewhere?

Hi Beja,
The file is attached now to post #1. I forgot to add it, teething problem.

 

[john mad doe]

hello
unfortunatly, the apply doesn't want to instal on my phone.

John

 

[moty22]

The layout scaling was corrected and runtime permission was added so it can work on newer phones.

 

[kimstudio]

Hi moty22, looking at the code the Y*10 should be X*10 right? as it actually squeezes the time axis.

 

[moty22]

Y*10 should be X*10 right?

You probably mean Y x 10 button, you are right, it has to be X x 10. I will correct it soon.