i m using at89c52 microcontrollrt to interact with hc-sr04. i have a problem to read the eacho pulse ....etc

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sir i want to have the code for 89s52 microcontroller to control speed of dc motor with using L293d motor driver i have a code shown below but it is not converting to the hex file in keil detecting error sir please this is humble request to make a favour and make a code speed controlling the speed of small dc motor with 90% 50% and 10% power please sir help me out this my last project in the last year for engineering please help me out the code is shown below..

org 0x00

jnb p1.4,main

main:

mov r7,#160

call pwm_init

or ....etc

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distance finder based on at89s52 and ultra sonic sensors hc sr04

Ultrasonic range finder using 8051 .
A simple ultrasonic range finder using 8051 microcontroller is presented in this article. This ultrasonic rangefinder can measure distances up to 2.5 meters at an accuracy of 1 centi meter. AT89s51 microcontroller and the ultrasonic transducer module HC-SR04 forms the basis of this circuit. The ultrasonic module sends a signal to the object, then picks up its echo and outputs a wave form whose time period is proportional to the distance. The ....etc

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To get full information or details of ultrasonic sensor hc sr04 with 8051 please have a look on the pages

http://edutwint-ultrasonic-sensor-based-dc-motor-control-using-labview

if you again feel trouble on ultrasonic sensor hc sr04 with 8051 please reply in that page and ask specific fields in ultrasonic sensor hc sr04 with 8051 ....etc

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hi sir/madam ,

Our project is based on agricultural we r using a two energy sources for running a motor.two energy sources means kptcl n solar power.here we r using gsm because the farmer need to send a message to microcontroller like start the motor so microcontroller can automatically on the motor through the relay circuit.and when the soil can wet at its reaching threshold value the motor can automatically turn off and sends a message to farmer like motor off. and also whenever the motor having problem the microcontroller sends mess ....etc

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I am searching for matter related to C code for microcontroller at 89s52 for cell phone based home automation system..so Plz send me matter related to this topic on my id- [email protected] ....etc

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hc sr04 pic code

#include <16F877.h>
#device adc=8
#FUSES NOWDT, HS, NOPUT, PROTECT, NOBROWNOUT, NOLVP, NOCPD, NOWRT, NODEBUG
#use delay(clock=20000000)

/**
/ Used sonar - HC-SR04 & DYP ME007
/ If you are using DYP ME 007 or any other 5 pin sonar, Please note that not to take the
/ pin named 'out'. Take echo instead.
/ Pin configuration (5 pin)- VCC(+5) TRIG(Trigger pin) ECHO(Output pin) OUT(Not needed) GND (Ground)
/ Pin configuration (4 pin)- VCC(+5) TRIG(Trigger pin) ECHO(Output pin) GND (Ground)
/
/ Code by Bhanu Watawan ....etc

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To get full information or details of programming of pir sensor based security system using microcontroller 89s52 please have a look on the pages

http://seminarsprojects.net/Thread-ppt-on-pir-sensor-based-security-systems

http://seminarsprojects.net/Thread-pir-based-auto-dialer-security-and-safety-alarm

if you again feel trouble on programming of pir sensor based security system using microcontroller 89s52 please reply in that page and ask specific fields ....etc

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it a good site for students who need help when required
i need this code . as soon as possible . i have to work on this ultrasonic hc-sr04 module ....etc

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Dear sir..
I know d working principle of ir sensor but its range is vry low so I cannote use it in some project..
So pls give me some idea about ultrasonic sensor..
1.how to interface with AT89c51/52
2.assembly language prog to glow an led when any body infront of the sensor..
Kindly help me sir ....etc

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