joystick poling and interfacing

[Darpan]

hey everyone,

im trying to interface joystick with P89v51rd2..im using an ADC 0808 to convert the analog joystick voltage into digital.

For each x and y axis it requires a separate adc input channel. My question is how am i suppose to poll two simultaenous lines of ADC to accordingly activate a single channel..kindly help. IM STUCK HERE. Thankyou

[Ashutosh Bhatt]

it is simple. you have to do multiplexing. TDM.

first select channel 1 of ADC.

do conversion

save value as x

now select channel 2

again do same conversion

save value as y

 

do it so rapid (5 to 10 samples/sec) that it will treat the process as continuous.

you can do even more faster.

[Author]

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