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arduino-libraries / Arduino_AdvancedAnalog

Advanced Analog Library
GNU Lesser General Public License v2.1
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DAC maximum Voltage is low (0.33V) #46

Closed hzarei4 closed 9 months ago

hzarei4 commented 9 months ago

Hello,

Using the Arduino Giga R1 WiFi and the pin DAC0, I tried to generate an analog signal but the maximum Voltage of this signal is ~330 mV. I used the function AdvancedDAC.write() and a sample code provided in this link and set the value as the maximum of the resolution(for example 255 for 8-bit resolution):

link from the arduino tutorial

Is it possible to have an analog output of 3.3V from the Arduino Giga R1 WiFi?

facchinm commented 9 months ago

Hi @hzarei4 , I just tested on a Giga and everything looks fine (the swing is 0-3.3V). Do you have any load connected to the DAC pin directly? Alternatively, 0.33V looks suspiciously like a 10x attenuation on the tool you are using to measure, can you double check by measuring 5V pin that the tool is ok?

hzarei4 commented 9 months ago

I have connected the Arduino to the PC, and when I try to connect the 5V pin, the Windows says that the Voltage can not be provided. Also, I connected the DAC0 to the oscilloscope and there is no other load on the system.

hzarei4 commented 9 months ago

@facchinm It is strange, I tried with 3.3V and 5V output and the oscilloscope shows 0.3V and 0.5V values.

hzarei4 commented 9 months ago

Figured it out that there was a problem with the measurement. Thanks a lot! :)