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Heart rate monitor with sms alert.

Heart rate monitor with SMS alert (Using 8051 and GSM module).

This project is about a heart rate monitor that senses the heart rate from the finger tip an sends it as a message to a cell pone number. This project is based on an 8051 microcontroller and a GSM module. Heart rate is sensed from the finger tip using a photo transistor / IR LED pair. This method is called photoplethysmography. Photoplethysmography is the volumetric assesment of an organ / tissue using light. IR reflection photoplethysmography is the exact method used here. In this method IR waves are send 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 on to the photo transistor. When the heart is not beating the volume of blood inside the tissue will be less and so less light gets reflected on to 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. Circuit diagram of this heart rate monitor is shown below.

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Circuit diagram.

heart rate monitor with SMS

The GSM module is interfacing with the microcontroller 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. LCD module is interfaced through Port 0 and Port 2 of the microcontroller. S2 is a reset switch.

Program.

    RS EQU P2.7      RW EQU P2.6      E  EQU P2.5      ORG 000H    MOV DPTR,#LUT                MOV P2,#00000000B            MOV P0,#00000000B           ACALL INIT  ACALL TEXT1   ACALL LINE2  ACALL 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 P2.0  SKIP1: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,#00100001B  MOV TH1,#253D  MOV SCON,#50H  SETB TR1  MOV A,#"A"  ACALL SEND  MOV A,#"T"  ACALL SEND  MOV A,#0DH  ACALL SEND  ACALL DELAY1      MOV A,#"A"  ACALL SEND  MOV A,#"T"  ACALL SEND  MOV A,#"+"  ACALL SEND  MOV A,#"C"  ACALL SEND  MOV A,#"M"  ACALL SEND  MOV A,#"G"  ACALL SEND  MOV A,#"F"  ACALL SEND  MOV A,#"="  ACALL SEND  MOV A,#"1"  ACALL SEND  MOV A,#0DH  ACALL SEND  ACALL DELAY1      MOV A,#"A"  ACALL SEND  MOV A,#"T"  ACALL SEND  MOV A,#"+"  ACALL SEND  MOV A,#"C"  ACALL SEND  MOV A,#"M"  ACALL SEND  MOV A,#"G"  ACALL SEND  MOV A,#"S"  ACALL SEND  MOV A,#"="  ACALL SEND  MOV A,#34D  ACALL SEND  MOV A,#"+"  ACALL SEND  MOV A,#"9"  ACALL SEND  MOV A,#"1"  ACALL SEND  MOV A,#"9"  ACALL SEND  MOV A,#"8"  ACALL SEND  MOV A,#"4"  ACALL SEND  MOV A,#"7"  ACALL SEND  MOV A,#"2"  ACALL SEND  MOV A,#"4"  ACALL SEND  MOV A,#"2"  ACALL SEND  MOV A,#"9"  ACALL SEND  MOV A,#"6"  ACALL SEND  MOV A,#"1"  ACALL SEND  MOV A,#34D  ACALL SEND  MOV A,#0DH  ACALL SEND  ACALL DELAY1      MOV A,#"B"  ACALL SEND  MOV A,#"P"  ACALL SEND  MOV A,#"M"  ACALL SEND  MOV A,#"="  ACALL SEND  MOV A,R1  ACALL ASCII  ACALL SEND  MOV A,R2  ACALL ASCII  ACALL SEND  MOV A,R3  ACALL ASCII  ACALL SEND  ACALL DELAY1    MOV A,#1AH  ACALL SEND  ACALL DELAY1  RET    SEND:CLR TI       MOV SBUF,A  WAIT:JNB TI,WAIT       RET    DELAY1: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      RET    TEXT1:      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      RET    LINE2:      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  

Read the projects Heart rate monitor using 8051 and Interfacing GSM module to 8051 before attempting these projects. Some GSM module are available with other supply voltages such as 5V, 12V etc. So power them according to the rated supply voltage. Please don’t forget to couple the ground lines of all modules together.

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