Microcontroller sensor interfacing exercises

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MPX6116A pressure sensor

• sensitivity: 45 mV/kPa; offset: 0.2 V at 15 kPa
• output voltage range: 0.2 V to 4.8 V

ADC

• Voltage reference: 2.25 V
• Number of bits: 16
• Jusfitication: right

Signal conditioning

• voltage divider
• division ratio: 13/28

To do:

• Write a function that calculates the sensed value as a function of the ADC code!

Test data:

sensor input	sensor output	ADC input	ADC output	calculated sensor input
41 kPa	1.37 V	0.636071 V	18527	41.0001 kPa
51 kPa	1.82 V	0.845 V	24612	50.9993 kPa
26 kPa	0.695 V	0.322679 V	9399	26.0005 kPa