dbuezas/arduino-web-oscilloscope

arduino-web-oscilloscope's Issues

ADC specification and configuration

Hi David,

First of all, thank you for this awesome project. I discovered it via Hackaday and had a LGT328P board laying around.

I have a few questions reguarding the ADC readings of the LGT328P.

1. I had a quick look at the english datasheet and it mentions that the ADC Sampling rate can reach to 5000KSPSat highest resolution which is translated from 最高分辨率时采样率高达500KSPS so I guess there is a typo and it can sample at 500 kSPS. Is this consistent with what you can read from the firmware?
2. Is the ADC value compared to VCC or internal voltage references? What happens if the LGT328P is powered with 3.3V?
3. What is AS? Is it supposed to be A1? Also the README mentions A1 while the software uses A0.
4. What is the arduino analog2 folder?
5. There are some strange readings when generating a signal from 0 to 4V (e.g. a sine; see screenshot below). This does not happens when generating a signal from 0 to 5V. Do you have any idea of what is happening? Do you switch between voltage references?

Thanks!

LGT8F328P nano style Holtec USB Serial not recognized?

Hello David,
I've tried to use your fabulous looking web-oscilloscope, but it seems it can't connect to my LGT8F328P nano style board with onboard Holtec USB Serial adapter. I'm running Windows 7 32-bits (Yes, I know...) with an updated version of Google Chrome (Version 86.0.4240.75 (Official build) (32-bits).

While the oscilloscope seems to run fine, it allows me to select a com-port. In the popup-window it shows all kind of ports, but it doesn't show the Holtec serial port of the LGT-board. That port is properly shown in the list of ports in the Arduino IDE and in the device-list of the Windows management console, but not in the web application.

When I insert a prolific serial adapter, that port is properly displayed, so I guess that could be a workaround, but I'd prefer to use the onboard USB connector. BTW. I also have some SOP20 boards laying around, but those don't have all analog pins available.
What can you suggest me to do?

Can't load webpage

This looks very interesting, however, I have done as it says and enabled the chrome://flags/#enable-experimental-web-platform-features flag, restarted page / browser and still unable to get the page to load past telling me to enable the flag.

Can't see any console logging that I can provide, any other suggestions?

Chrome Version 88.0.4324.182 on https://dbuezas.github.io/arduino-web-oscilloscope/

Sinus Zero offset

Thanks for sharing this tool.

When i meas. a sinus of 1V on A0, it cut off 1/3 of the curves buttom
If i then changes to 50mV i shows right.
if i increase to 100mV it shows right, but start cutting buttom again within 5 sec.
I have also tried with a capasitor in series and an completely seperate generator.

Squrewave with ref. to Zero shows right, though the V scale is wrong if you
input 10Khz 4V - and choose 500mV/div and 101uS/div, it shows only 2.5V

I have a normal scope, it show everything right.

Can't get a waveform or trigger

Looks amazing but I can't get it to trigger or show a wave form. I have uploaded OK and pressed run.
Serial status =Connected. Trigger = Searching. I have a TTL square wave as input.
Channel = A0, trigger A0, Auto. Run button is green

I have tried a Chromebook and a Windows 10 PC.
The LGT8F328P is connected via a CH340 USB bridge.

error when using arduino uno

I am using the website https://dbuezas.github.io/arduino-web-oscilloscope/
but when trying to upload firmware to arduino uno the following error appears:
Error: Sending 3020: receiveData timeout after 400ms