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I am trying to do "ultrasonic range finder" project mentioned here. Instead of using 7 segment displays, i am tryiing to interface bluetooth to serial port of 8051 and i am transfering that data to laptop to process it there. But despite of doing connections in a correct manner there has been no tranmisison of data from 8051 to laptop. I am using real term software on laptop. I have used 9600 baud rate. The bluetooth module i am using is hc-05.
PS- 1)I have checked code in keil by running it step by step mode in debuggin and program does what is expected .
2) I have connected HC-05 in correct manner( tx of bt to rx of 8051,rx of bt to tx of 8051)
3) hc-05 and software real term are working fine since i have checked them using arduino.
please help i am posting my source code here:
ORG 00HSETB P3.0//sets p3.0 as input from bluetooth moduleCLR P3.1//sets p3.1 as output to bluetooth moduleCLR P3.2 // sets P3.2 as output for sending triggerSETB P3.3 // sets P3.3 as input for receiving echoMAIN: MOV TMOD,#00100000B // sets timer1 as mode 2 auto reload timerMOV TL1,#210D // loads the initial value to start counting fromMOV TH1,#210D // loads the reload valueMOV A,#00000000B // clears accumulatorSETB P3.2 // starts the trigger pulseACALL DELAY1 // gives 10uS width for the trigger pulseCLR P3.2 // ends the trigger pulseHERE: JNB P3.3,HERE // loops here until echo is receivedBACK: SETB TR1 // starts the timer1HERE1:JNB TF1,HERE1 // loops here until timer overflows (ie;48 count)CLR TR1 // stops the timerCLR TF1 // clears timer flag 1INC A // increments A for every timer1 overflowJB P3.3,BACK // jumps to BACK if echo is still availableMOV R4,A // saves the value of A to R4ACALL SENDACALL DELAYACALL DELAYACALL DELAYSJMP MAIN // jumps to MAIN loopDELAY1: MOV R6,#2D // 10uS delayLOOP1: DJNZ R6,LOOP1RETSEND: MOV TMOD,#20H// timer 1 in mode 2 autoreloadMOV TH1,#0FDH//baud rate 9600 generationMOV SCON,#50HSETB TR1MOV A,R4MOV SBUF,A//serial tranmisison via tx connected to bluetooth moduleTHERE: JNB TI,THERECLR TIRETDELAY: MOV TMOD,#00010000BMOV TH1,#00HMOV TL1,#00HSETB TR1HERE3: JNB TF1,HERE3CLR TR1CLR TF1RETENDdoes your bluetooth device pairs with laptop's inbuilt bluetooth? u can also try flash magic software. it has also serial port monitor
yes it pairs with laptop properly, and even sends data correctly i have checked its pairing using arduino and it works correctly. I dont know what wrong happens when i do it with AT89S52(8052)
i think there is a problem in baud rate setting.
which crystal u r using? you must use 11.0592 MHz crystal only
Yes that only i am using . Crystal of 11.0592 MHZ along with two 33pf capacitors connected between 18 and 19 pins to ground . Still the problem persists
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