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I tried to disconnect the trigger wire to the ultrasonic sensor transmitter but the behavior did not change. LCD still display output=45. I am afraid that my lcd function is not correct.
Ya, I think you are right. I already change line 68 with the code:
while(INT0==0);
while(INT0==1);
DPH=TH0...
However the output dislpayed by lcd is always 45 and is still not varying. Any idea to fix this?
Ya that code is my reference but I change a little bit and add with lcd code. I also try with while state to wait the ping response(echo) and it was not working. My lcd always display number 44 and it was not varying according to distance.
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Can you tell me the mistakes in...
I want to make a project to measure distance using ultrasonic sensor HC-S*04 and LCD to display the distance in cm. I use AT89C51, the trigger pin for ultrasonic sensor is P3.5 and the echo pin is P3.2. The echo pin is connected to P3.2 because I use interrupt so that whenever there is a HIGH it...
I want to make a project to measure distance using ultrasonic sensor HC-S*04 and LCD to display the distance in cm. I use AT89C51, the trigger pin for ultrasonic sensor is P3.5 and the echo pin is P3.2. The echo pin is connected to P3.2 because I use interrupt so that whenever there is a HIGH it...
Ya, it works after I set P1.0 high in the beginning. Thanks for the suggestions.
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It works when I use power supply as inverting input to comparator. The led is on and off every time I vary the input voltage lower or higher than voltage reference. However, when the inverting...
I have build a project using AT89S51 and comparator LM324. The input to uC is from comparator that the inverting input is connected to infrared sensor and the non-inverting input set as the voltage reference (Vr). For certain distance the output voltage from infrared sensor is higher than the Vr...
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