I would like to ask you very kindly How can I correctly calculate the resolution for a A/D converter (10bits) ? Why many people is using the following formula Vref/1024 and other Vref/(1024-1) ???? This is very confusing ! Thank you in advance for a suitable response.

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Why many people is using the following formula Vref/1024 and other Vref/(1024-1) Because many people are right and others are wrong.

It depends what the formula is used for. The resolution is Vref/1024. But if what is needed is a fraction of full scale (0.0 to 1.0) then Vref/1023. is appropriate. For example, if Vref is 5V, then the resolution is 4.88mV per bit. But if you want to convert an ADC reading to a voltage then you ne…

...except that you can never say the input is 5V, only that the voltage is greater than 5V - 4.88mV. A small distinction.

Yes, you would have to calibrate it to know what the fullscale voltage is and adjust the formula accordingly. If it can exceed that, I would submit it hasn't been engineered properly. Pete

adjust the formula accordingly There is no "accordingly". It's a limitation of the A/D. It's probably one of the reasons voltage reference devices often come with peculiar outputs, like 1.024, 2.048 or 4.096 volts.

Ohhh, I see what you mean now. Yup. Pete

Ok guys, thanks a lot for your answers ... but I think you didn't give a quite clear answer .... I am trying to do a project for my secondary school and I dont really understand what you wrote! ..... Could you response to this please : Hello, I would like to ask you very kindly about 10bit arduino…

Ok guy, thanks a lot for your question ... but I think you didn't give a more precise second question* .... I am trying not to do the project for a secondary school student and I do really understand what you wrote! And so did the other guys answering your question ..... Could you response to this p…

??? what do you mean Jantje? :~ I am trying to read a pot but I want to understand A/D conversion first. My next step is to study electronics in the future, but many people told me that using arduino I'm just wasting my time :frowning: and I have to learn embedded C language to work with PIC or AVR …

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A/D converter

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