G gudu New Member Jan 22, 2009 #1 Iam working on a heart beat sensor circuit shown below.When I place a finger there should be a pulse wave coming out of pin 7 but iam getting only a dc line. Can someone help me what is the problem. Attachments heartbeat-somplest dia.gif 9.1 KB · Views: 1,495
Iam working on a heart beat sensor circuit shown below.When I place a finger there should be a pulse wave coming out of pin 7 but iam getting only a dc line. Can someone help me what is the problem.
M mneary New Member Jan 30, 2009 #2 What is the voltage on pin 1? I would try a 1M (1 meg) resistor between pins 3 and 8, and 220K between the "top" of R17 and 5V. After that, try different sensors, different LEDs, (maybe even infrared).
What is the voltage on pin 1? I would try a 1M (1 meg) resistor between pins 3 and 8, and 220K between the "top" of R17 and 5V. After that, try different sensors, different LEDs, (maybe even infrared).