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[chip scheme design] pulse oximeter
2022-07-07 01:21:00 【Xicheng micro technology program development】
The scheme of using oximeter chip MCU The main control chip is combined with a red light sensor , To reduce hemoglobin (Hb)、 Oxygenated hemoglobin (HbO2) The absorption spectrum characteristics in the red and near-infrared regions are the theoretical basis , Blood oxygen content and heart rate measurement , And display the measured results on the display . The accuracy of blood oxygen content can reach ±1%, The accuracy of heart rate can reach ±1bpm or ±1 Take a big value . When measuring, just insert your finger , The display screen will directly display the measured oxygen saturation value , It has high accuracy and repeatability .
Introduction to the main components and principles of the oximeter :
MCU
Memory (EPROM And RAM)
Two controls LED Digital to analog converter
A device that filters and amplifies the signal received by the photodiode
The analog-to-digital converter that digitizes the received signal to provide it to the microprocessor
Small LCD
Finger clip oximeter chip program specifications
◆ Display type :OLED Blue and yellow dual color display
◆ Blood oxygen saturation
measuring range :70%~100%
precision : Scholar 1%
◆ heart rate
measuring range :25BPM~250BPM
precision : Scholar 1BPM
◆ Blood perfusion index :≥0.3%, Scholar 0.1%
◆ Display type :OLED display
◆ Manually adjust the interface direction :6 Display mode ,4 Two display directions
◆LED Show : Display both test values and bar graphs
◆ Low battery voltage indicator
◆ Automatic standby or sleep ( The automatic sleep time is about 12 second )
◆ Blood oxygen saturation
◆ Call the police
Basic parameter alarm : Low saturation alarm , high ( low ) Pulse rate alarm
Sensor status alarm : The sensor automatically falls off and gives an alarm
System fault alarm : Falling off alarm , Low battery alarm : The voltage is below 2.4V( It can be modified according to the actual product situation )
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