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help me due to error in reading phothodiode as analog ensor

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nurulairza

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i have problem to know whats wrong with my analog circuit.. before... i used potentiometer in order to read value and convert it to adc by using pic18f452..and then the result i display by using 3 types of led.. and everything its ok... my led works as what i want..
but now.. i replace potentiometer with photodiode sensor but my circuit does't work... Can anyone tell me what should i do in order to measure voltage across my photodiode sensor to use as an input to microcontroller??
here i attach my circuit diagram... please...

 

The most likely cause is that you don't have enough light. Try increasing R1.

Keith.
 

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hello,

maybe impedance input of analog input is too low.
try to add a buffer AOP .
can you measure the voltage accross photodiode
with a multimeter while a big source of light is on it ?
 

:smile: ... i changE reistor to 100k and its works.,,, thank you,,,
 

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