Hey Nigel, What do you mean by i need to keep in consideration high impedances. Do you mean the load connected to the input of the microcontroller? That needs to be low impedance? To overcome the hold and sample thing should i just put a small delay btw sampling? maybe like a millisecond or something. Can you please explain the significance of the impedance thing to me? this is the first iv heard of it being a factor. I am using a distance to voltage transducer. also im using an indicator for force. when i sample the atd inputs with nothing connected i get random values when i do slow sample. When i do fast sample, i get random in the begging then it just sticks to the maximum which in my case is 255. 8 bits. This is when my input is floating. I havent connected it to the transducer as yet because i dont have it yet.
can u explain why this happens.