8051 microcontroller Projects based Heart Rate Monitor HRM with SMS Alert

Heart Rate Monitor HRM with SMS Alert

This project is 8051 microcontroller Projects based Heart Rate Monitor HRM with SMS Alert. Heart rate is sensed from the fingertip using a phototransistor / IR LED pair. This method is called photoplethysmography. Photoplethysmography is the volumetric assessment of an organ/tissue using light. IR reflection photoplethysmography is the exact method used here.

 

Heart Rate Monitor HRM with SMS Alert Circuit

In this Heart Rate Monitor HRM with SMS Alert, IR waves are sent to the tissue, and reflected wave is picked using a photo-transistor. When the heart beats the volume of blood will be more in the tissue. This time more light gets reflected onto the phototransistor. When the heart is not beating the volume of blood inside the tissue will be less and so less light gets reflected onto the photo-transistor. The result will be a pulse waveform at the collector of the photo-transistor. The rate of this pulse waveform will be equal to the heart rate. The waveform is amplified, filtered, squared, and fed to the microcontroller for counting. The circuit diagram of this heart rate monitor is shown below.

heart rate monitor using 8051 microcontroller project report

The GSM module is interfacing with the 8051 microcontrollers using serial communication. RX pin of the GSM module is connected to the TX pin of the microcontroller. A relay is connected to P2.0 through a driving transistor. This relay can be used to switch an alarm or any other device when the heart rate goes above 80 beats per minute. The heart rate is also displayed on a 16×2 LCD module. The LCD module is interfaced through Port 0 and Port 2 of the microcontroller. S2 is a reset switch

Program for Heart Rate Monitor HRM with SMS Alert

 RS EQU P2.7    RW EQU P2.6    E  EQU P2.5    ORG 000H  MOV DPTR,#LUT              MOV P2,#00000000B          MOV P0,#00000000B         ACALL INITACALL TEXT1 ACALL LINE2ACALL TEXT3         MAIN: MOV R6,#228D      SETB P3.5                  MOV TMOD,#01100001B        MOV TL1,#00000000B        MOV TH1,#00000000B         SETB TR1           BACK: MOV TH0,#00000000B         MOV TL0,#00000000B         SETB TR0             HERE: JNB TF0,HERE               CLR TR0                   CLR TF0                   DJNZ R6,BACK      CLR TR1                    CLR TF0                    CLR TF1                   MOV A,TL1      MOV B,#4D      MUL AB      MOV R7,A      CJNE A,#80D,SKIP SKIP: JC SKIP1      SETB P2.0SKIP1:JNC CONT      CLR P2.0 CONT:CLR PSW.7      ACALL SPLIT       ACALL INIT      ACALL TEXT1      ACALL LINE2      ACALL TEXT2      ACALL BPM       ACALL GSM      SJMP MAIN  GSM:     MOV TMOD,#00100001BMOV TH1,#253DMOV SCON,#50HSETB TR1MOV A,#"A"ACALL SENDMOV A,#"T"ACALL SENDMOV A,#0DHACALL SENDACALL DELAY1MOV A,#"A"ACALL SENDMOV A,#"T"ACALL SENDMOV A,#"+"ACALL SENDMOV A,#"C"ACALL SENDMOV A,#"M"ACALL SENDMOV A,#"G"ACALL SENDMOV A,#"F"ACALL SENDMOV A,#"="ACALL SENDMOV A,#"1"ACALL SENDMOV A,#0DHACALL SENDACALL DELAY1MOV A,#"A"ACALL SENDMOV A,#"T"ACALL SENDMOV A,#"+"ACALL SENDMOV A,#"C"ACALL SENDMOV A,#"M"ACALL SENDMOV A,#"G"ACALL SENDMOV A,#"S"ACALL SENDMOV A,#"="ACALL SENDMOV A,#34DACALL SENDMOV A,#"+"ACALL SENDMOV A,#"9"ACALL SENDMOV A,#"1"ACALL SENDMOV A,#"9"ACALL SENDMOV A,#"8"ACALL SENDMOV A,#"4"ACALL SENDMOV A,#"7"ACALL SENDMOV A,#"2"ACALL SENDMOV A,#"4"ACALL SENDMOV A,#"2"ACALL SENDMOV A,#"9"ACALL SENDMOV A,#"6"ACALL SENDMOV A,#"1"ACALL SENDMOV A,#34DACALL SENDMOV A,#0DHACALL SENDACALL DELAY1MOV A,#"B"ACALL SENDMOV A,#"P"ACALL SENDMOV A,#"M"ACALL SENDMOV A,#"="ACALL SENDMOV A,R1ACALL ASCIIACALL SENDMOV A,R2ACALL ASCIIACALL SENDMOV A,R3ACALL ASCIIACALL SENDACALL DELAY1MOV A,#1AHACALL SENDACALL DELAY1RETSEND:CLR TI     MOV SBUF,AWAIT:JNB TI,WAIT     RETDELAY1:MOV R6,#15D       BACK1: MOV TH0,#00000000B          MOV TL0,#00000000B          SETB TR0             HERE1: JNB TF0,HERE1              CLR TR0                    CLR TF0                   DJNZ R6,BACK1      RET   INIT:     MOV A,#0FH     ACALL CMD    MOV A,#01H     ACALL CMD    MOV A,#06H     ACALL CMD    MOV A,#83H     ACALL CMD    MOV A,#3CH     ACALL CMD    RETTEXT1:    MOV A,#"H"    ACALL DISPLAY    MOV A,#"e"    ACALL DISPLAY    MOV A,#"a"    ACALL DISPLAY    MOV A,#"r"    ACALL DISPLAY    MOV A,#"t"    ACALL DISPLAY    MOV A,#" "    ACALL DISPLAY    MOV A,#"R"    ACALL DISPLAY    MOV A,#"a"    ACALL DISPLAY    MOV A,#"t"    ACALL DISPLAY    MOV A,#"e"    ACALL DISPLAY    RETLINE2:    MOV A,#0C0H     ACALL CMD    RET     TEXT2:       MOV A,#"b"    ACALL DISPLAY    MOV A,#"p"    ACALL DISPLAY    MOV A,#"m"    ACALL DISPLAY    MOV A,#" "    ACALL DISPLAY    RET     TEXT3:    MOV A,#"c"    ACALL DISPLAY    MOV A,#"o"    ACALL DISPLAY    MOV A,#"u"    ACALL DISPLAY    MOV A,#"n"    ACALL DISPLAY    MOV A,#"t"    ACALL DISPLAY    MOV A,#"i"    ACALL DISPLAY    MOV A,#"n"    ACALL DISPLAY    MOV A,#"g"    ACALL DISPLAY    MOV A,#"."    ACALL DISPLAY    MOV A,#"."    ACALL DISPLAY    MOV A,#"."    ACALL DISPLAY    RET  BPM:       MOV A,R1    ACALL ASCII    ACALL DISPLAY    MOV A,R2    ACALL ASCII    ACALL DISPLAY    MOV A,R3    ACALL ASCII    ACALL DISPLAY    RET          CMD: MOV P0,A    CLR RS    CLR RW    SETB E    CLR E    ACALL DELAY    RET DISPLAY:MOV P0,A    SETB RS    CLR RW    SETB E    CLR E    ACALL DELAY    RET DELAY: CLR E    CLR RS    SETB RW    MOV P0,#0FFh    SETB E    MOV A,P0    JB ACC.7,DELAY    CLR E    CLR RW    RET       SPLIT: MOV B,#10D       DIV AB       MOV R3,B       MOV B,#10D       DIV AB       MOV R2,B       MOV R1,A       RET      ASCII: MOVC A,@A+DPTR       RET    LUT: DB  48D     DB  49D     DB  50D     DB  51D     DB  52D     DB  53D     DB  54D     DB  55D     DB  56D     DB  57D       END