Current Firmware on GitHub

[mahesh]

Hi,

I've recently got a Current Ranger R3. Currently I have an OLED connected and there is a string "4095 - 6" being printed continuously to the SerialUSB. I've gone through the code on GitHub and as far as I can tell, it shouldn't output anything like that so I was wondering if it is current or if I was reading it wrongly. I'm trying to disable the string so that I can log the readings to USB.

[Felix]

It's something I added in my local firmware for debugging. Specifically the lines below, before the end of the loop inside the if (OLED_found .. ) statement:

Code Select Expand

    SerialUSB.print(adcRead(A1));
    SerialUSB.print(" - ");
    SerialUSB.println(adcRead(A6));

You can ignore this. When you reflash, use the given calibration values. And make sure you don't have a DUT that is earth referenced (ie. powered from MAINS) if your PCB/USB is also referenced to the same mains earth. Heed the warnings in the guide about this.

Also note that USB will invariably introduce switching noise.

[mahesh]

Thanks Felix,

Understood about the USB Switching Noise. I'm just interested in the average current trends. Quick question , what did you mean about the ADC Calibration ? Do you want me to use the calibration values in the sketch or is there someway to have it pick the values in EEPROM.

[Felix]

EEPROM is erased when you reflash firmware.
There was a label with recommended calibration values that were programmed into the CR during initial testing/programming (offset, gain, LDO).