The PortA pins are analogue and you need to set them to digital with the ADCON1 register
ADCON1 = %00000110 - see datasheet
Or you could use PortB for trig and echo
Phil
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Re: Ultrasonic [HC-SR04] + PIC16F877A
The PortA pins are analogue and you need to set them to digital with the ADCON1 register
ADCON1 = %00000110 - see datasheet
Or you could use PortB for trig and echo
Phil
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