ldr to adc
No you can not connect an RTD not an LDR directly to a microcontroller pin. These two sensors are mere temperature dependemt resitors; meaning that the value of their resistance varies with temperature. You need to convert this variable resistance to a voltage so that it can be sensed with an ADC. The best strategy is to supply them with a constant current (from a current source) and measure the developed voltage. Feed this voltage to the ADC to convert to digital form.
Hope this helps.
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