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This the circuit that i use.its exactly as your circuit but the only difference is that i use tcrt5000.I have buit this circuit more than 15 times and use your arduino code, but for some reason it doesnt work and i have tried both mcp6002 and lm358.Every time i open the serial monitor too see the pulse value ,it shows first the absorbance which is around 1,30 in my case and then after the "," it shows the value of the pulses(bpm)to be 190 or less and it doesnt change when i put my finger on the sensor .i am not sure id the problem is the code or the circuit but i cannot fix it. can help me with that????? maybe suggest me an other programm for measuring bmp(i care only about the serial monitor not the processing.Thanks
Hello ,i am using tcrt5000 instead of the photodiode and a IR led .Does this change the arduino program that you have made and if yes how ?