ABSTRACT
The use of microcontroller is in every field
even we can use it in the design and fabrication of biomedical equipments. A little example is
here. The microcontroller at89s51 (8051) is here used to develop a heart beat
monitoring system. By placing your finger in between a LED and photo
resistance, we can detect the pulses of heart, the analog voltages are further
processed with an operational amplifier LM 358, this chip has two built in
OPAMPs. The TTL pulses or digital pulse are then feed to the external interrupt
of microcontroler 8051. By using a software counter in the code , we can count
the pulses, and the result the process is displayed on an LCD (2 line 16
characters). The schematic circuit diagram of heart beat monitor is shown below and the code ( c program) in c
language using keil C51 uv3 is also shown
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DIAGRAM:
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