Here is a simple tutorial to build a Distance sensor which will show the distance from the distance sensor HC-SR04 ( Or any other compatible devices) to the wall or obstacles in front of the sensor in CentiMeters.
This project uses a HCR-SR04 distance sensor and atmega 328 or any other atmega chip which is programmed using a arduino programming kit, SO the project is based on arduino. But our final Circuit will be a standalone circuit without attached arduino programmer.
It is a simple Ultrasonic ranging module.
quiescent current : <2mA
effectual angle: <15°
ranging distance : 2cm – 500 cm
We can send a short ultrasonic pulse at t1 , and if any obstacles is there the received ultrasonic signal is converted to an electrical signal as Echo. If a 10μs width trigger pulse is sent to the signal pin, the Ultrasonic module will output eight 40kHz ultrasonic signal and detect the echo back. The measured distance is proportional to the echo pulse width and can be calculated by the formula above. If no obstacle is detected, the output pin will give a 38ms high level signal.
Either a Arduino Board or a Arduino IC( Atmgea 328 , Atmega 128 , Atmega 8 etc ) with a programmer is used. To know more about Arduino visit the official arduino site http://arduino.cc
3> 16*2 LCD
SO If you are going to use arduino board then please connect devices as following:
* LCD RS pin to digital pin 12
* LCD Enable pin to digital pin 11
* LCD D4 pin to digital pin 5
* LCD D5 pin to digital pin 4
* LCD D6 pin to digital pin 3
* LCD D7 pin to digital pin 2
* LCD R/W pin to ground
* 10Komhs Variable resistor with two ends to +5v and ground and the middle wipper ti LCD pin VO.
For more detail: arduino based distance sensor