Pulse Rate detector using MSP430 - Circuit Diagram

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I have uploaded the snapshot of the circuit diagram for Pulse Rate detector using MSP430g2553. Hope it helps! If it did then do your bit by subscribing to my YouTube channel where I post videos related to Embedded systems!

Circuit diagram

Pin connections between the micro-controller and the LCD (JHD162A) are as follows:

Micro-controller	LCD
3	4
4	6
6	11
7	12
14	13
15	14

MSP430G2553 internal temperature sensor

MSP430 Launchpad - Internal Temperature Sensor

Code:

#include <msp430g2553.h>

int temp = 0;

int main(void){

WDTCTL = WDTPW | WDTHOLD; //stop the watchdog timer


//Select 1.5 V, 64 clock cycles, enable ADC interrupt, Turn on the reference generator
ADC10CTL0 = SREF_1 + REFON + ADC10ON + ADC10SHT_3 + ADC10IE;

//Select input channel 10 and divide the clock frequency by 4
ADC10CTL1 = INCH_10 + ADC10DIV_3;

//Enable and Start conversion
ADC10CTL0 |= ENC + ADC10SC;

//Enter low power mode
__bis_SR_register(LPM0_bits + GIE);

//fetch the temperature value from ADC10MEM register
temp = ADC10MEM;

//convert it into degree celsius
temp = ((temp * 27069L - 18169625L)>>16);

return 0;

}

//ISR
#pragma vector = ADC10_VECTOR
__interrupt void adc_interrupt(void)

{
__bic_SR_register_on_exit(CPUOFF);
}

Explanation: https://youtu.be/51pAz11NklA