I have a problem about getting data from ADS1115 16 bit ADC with photodetector circuit,can someone help me?

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I have to implement ADS1115 -16 bits 4 channel ADC - to photodetector circuit for measuring different voltage values with different light levels.

My connections like: ADS 1115 SCL to Arduino Uno A5,
ADS 111r SDA to Arduino Uno A4,
Arduino Uno 5V to ADS 1115 VDD,
Arduino Uno GND to ADS 1115 GND,
and photodetectors terminal to ADS 1115 A0 pin for measurement.

But I have seen same default voltage level all time with different kind of codes for Arduino Uno. For example, if my code is like " multiplier = 0.1875F" I have seen -0.19V all the time.
I tried my circuit without ADS 1115,I have used standard serial resistance and voltage measurement of Arduino than I can measure the changes of resistance and voltage due to light difference.Thats why I know my circuit components are not broke.
Can some one help me to solve this problem?

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Datasheet?

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I don't have datasheet but it seems like that.

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What type of photodetector is it? Photoresistor? photodiode? phototransistor? Implementation will be different depending on the type of device.

How is it connected to the ADC? The picture of some wires without knowing where they go is not helpful.

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This project would be much easier if you used a photodetector of known type, complete with a data sheet.

It is very easy to damage the ADS1115, so stop using it until you find out exactly what you have.

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