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My Experiences With Sensors - Part 3

Updated on April 8, 2018

1) BMP085 Barometric Pressure Sensor

This is a barometric pressure sensor whose measurement range goes from 300 to 1100 hPa, or from 225 to 825 mmHg. It also measures the ambient temperature in a range from -40 to 85 degrees Celsius. The power supply of this sensor is 1.8 to 3.6 volts and uses a 12C communication protocol. There are other superior versions of this model, the difference is the measurement range mainly. My experience with this sensor is good, it is stable, reliable readings and very economical. I have used it mainly to develop weather stations with both Arduino plates and Raspberry Pi.

2) FSR Force Sensor

This is a resistive force sensor of 0.5 inches in diameter. Its measuring range goes from 100 grams and up to 10 kilograms, or from 1.5 psi to 150 psi. It has a useful life of ten million uses and works reliably in temperatures ranging from -30 to 70 degrees Celsius and has a maximum current of 1 mA per square centimeter. My experience with this sensor confirms that we have to take many factors to design a digital scale: for example, we must follow a procedure to create the formula of our digital scale, the software used is also important and finally we must have good ideas to design its mechanical structure. Otherwise we will have a scale with errors and very unstable in their readings.

3) Capacitive Pressure Sensor

This is a pressure sensor whose measurement range is from 1 psi to 5.8 psi, or from 51 to 300 mmHg. In addition, it has a good performance and is stable from 15 to 85% relative humidity and -40 to 125 degrees centigrade. I used this sensor to graph the blood pressure of the human body and it proved to be very stable, even though the semiconductor pressure sensor is more popular today. An application for use in blood pressure meters called baumanometers, where the oscillometric method is normally used.

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