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Alina310199's avatar
Alina310199
Icon for New Contributor rankNew Contributor
4 years ago

MAX 10 ADC

Hello, guys! I really need your help. I have a fpga MAX10 10M50DAF484C6G Development Kit and I want to write a code in verilog or vhdl so that when I move the potentiometer to light different LEDs. For example, if my potentiometer is at 0.5V, my LED 1 will light up, if it is between 0.56-1 V, my LED 2 will light up and so on. In total I have 5 LEDs. The max value is 2.5V. I read a lot about ADC. I know that there is a formula that calculates the conversion from analog to digital, more precisely Digital Code = Vin / Vref) × 2 ^ 12 where Vin is the voltage from the potentiometer and Vref is 2.5 V, but I don't know how to implement it in verilog or vhdl. Can someone help me?

3 Replies

  • sstrell's avatar
    sstrell
    Icon for Super Contributor rankSuper Contributor
    4 years ago

    You could make use of the threshold feature for each ADC channel to provide an indication on an additional IP interface of when a particular voltage is hit.

    As for measuring the exact voltage, the easiest formula is ((digital value x (full scale voltage/4096)) - (full scale voltage/4096)). You need to subtract 1 step (LSB) because full scale (0xfff) is actually 1 step lower, which is common with ADCs. So for a 2.5 V range (without using the extra prescaler) each step is 610.35 uV.

  • paveetirrasrie_Altera's avatar
    paveetirrasrie_Altera
    Icon for Frequent Contributor rankFrequent Contributor
    4 years ago

    Hi Alina,


    Since there are no feedback for this thread, I shall set this thread to close pending. If you still need further assistance, you are welcome reopen this thread within 20days or open a new thread, some one will be right with you.

    Thanks.


    Regards,

    Pavee