Introduction - If you have any usage issues, please Google them yourself
ad conversion C-language program, the hardware part by AT89C51, MAX232, ADC0809, NF555 composition, 555 used to generate the ADC0809' s CLK, it seems that it more than 300 K, the input voltage directly added to the ADC0809' s IN0, because I only use all the way so ADC0809 The A, B, C three sites I went straight into the ground. ADC0809 of ALE and StartART I linked to the P3.4 controlled by the microcontroller.