arunbhaskar
Junior Member level 3
I'm doing a project on heart rate monitor using finger sensor. I've enclosed the schematic below. The output of Schmitt Trigger i.e. the actual pulses goes to the INT0 pin of the microcontroller. I'm using a program to check the heart rate at the end of every 4th pulse. After calculating the BPM, I need to output it to a 16x2 LCD. I've enclosed the program below. I compiled it in Keil using Code ROM size:COMPACT in keil because my program didn't get built for Code ROM size small. I loaded the program onto the flash by using a serial port programmer.
I left the INT0 pin open just to check the program because according to my program, only welcome message would appear without any interrupt. When I switched the power supply ON, I didn't get any output on the LCD and found that the microcontroller was heated up. What could be the reason? Please help.
I left the INT0 pin open just to check the program because according to my program, only welcome message would appear without any interrupt. When I switched the power supply ON, I didn't get any output on the LCD and found that the microcontroller was heated up. What could be the reason? Please help.