Issue working with MCP4725 (Digital to Analog converter) and Raspberry Pi

2022-11-25T10:42:57.773000Z

Hello everyone,

I am facing an issue when working with MCP4725 and raspberry pi. I have downloaded the MCP4725 library from this forum. No matter what value I put in the MCP4725.xdacIn, the voltage is always at 0V.

iDacValue : INT;
MCP4725.xdacIn := iDacValue; (screenshot = Issue DAC 1)

I am using a hardware that has raspberry pi core. The Codesys version I am using is Ver3.5 SP17 Patch3. I tried putting 97 in I2C Bus Parameters for MCP4725 (screenshot = Issue DAC 2) based on a conversation thread here on this forum. But still, I am facing the same issue.

I have been using ADC in I2C mode as well. I didn't face any problem with that as I got an example code for it.

Am I facing this problem because I am using ADC and DAC with I2C at the same time?

Could anyone please help me out? I am attaching the screenshots as well.

It is also mentioned in the library method file 'AfterReadInputs' (screenshot = Issue DAC 3) that we must change wInfo[0] to 16#60 from 16#40 if we want to write the values into DAC register and EEPROM. I guess these files are write protected. Do I have to change this value and if so how? I am unable to do that.

Looking forward to your reply.

Thanking you in advance.
Best Regards!

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Issue working with MCP4725 (Digital to Analog converter) and Raspberry Pi