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What do you mean by usart?
When I put the box 10 inches from the sensor, the output is 0.35V. I think supposedly the output is 0.1V if we used the formula (Vcc/512)/inch right? Then, I wonder why is the output still remains at 0.35V even I put the box 39.37 inches (1 meter) far from the sensor? How to trigger the sensor?
I've already use the multimeter as told and the output is vary according to range. but when i attach the sensor to dsp board and use the ADC module, the output is not as expected.