I have designed and manufactured a custom board for one of my projects. The board features Atmega-328-AU microcontroller and is programmed using Arduino IDE.
The issue I am facing is that none of the analog port responds to analogRead(port) function, whereas, if I check the voltage across the pins externally using DMM I can see the voltage variation.
The board does not feature TX/RX pins therefore I cannot use serial monitor.
Can anyone please help me out with this issue like what I am exactly missing.
If possible, you should always post code directly in the forum thread as text using code tags:
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Please provide a detailed description of the circuit on the analog pin, including exactly which pin on the ATmega328 is in use. Ideally, this would be in the form of a schematic (picture of a drawing on paper perfectly acceptable), but since this is likely to be a very simple circuit even a text description should be sufficient.
usmanqadir91:
The issue I am facing is that none of the analog port responds to analogRead(port) function, whereas, if I check the voltage across the pins externally using DMM I can see the voltage variation.
How do you know that it does not read it correctly? It might control e.g. a relay but we don't know. Please post a schematic.
usmanqadir91:
The board does not feature TX/RX pins therefore I cannot use serial monitor.
Lesson learned Always try to add a form of test points; unless pin count is at a premium, it would not cost you much to at least have GND, TX and RX on a three pin header on your board to connect a FTDI adapter; you don't have to put the header on (if you want to save costs).
I am using a very simple code to read data from analogPort for a force sensitive resistor and then toggle a digital pin high if the threshold is crossed. However, the digital pin never get high no matter how much force I apply. I have read the data across FSR using DMM it show variations. Even the variations can be read on pins of atmega 328.
Pin # 27 of atmega is used via a voltage division circuit for FSR
Always try to add a form of test points; unless pin count is at a premium, it would not cost you much to at least have GND, TX and RX on a three pin header on your board to connect a FTDI adapter; you don't have to put the header on (if you want to save costs).