Sensing physical parameter and converting into electrical signal is one of the important task in IoT enabled system

Sensors role in iot enabled systemsThis is further to my previous post on IoT.

Let me now discuss different building blocks of an IoT enabled system.

Let us start with sensors.

We all know that we require sensors to  sense different physical parameters and to convert them into corresponding electric signals.

There is a large variety of  sensors in the market. Any user has to first  understand and select one of the  different sensors that can be used for his/her desired application by studying  their specifications and characteristics.

Sensor signal output  is usually  of very low  voltage and that is the reason we need a high resolution digital multimeter with at least 5 1/2 Digit or 6 1/2 digit display to measure it.

We also need to see the shape of the  output signal from different sensors and we thus we need a digital storage oscilloscope with vertical sensitivity from 500µV/div to 5V/div.

It is desired that  the oscilloscope has built in digital filters and facility to select more number of samples in average mode ( least 2048 points ) to filter out noise in the captured signal from sensors.

After we capture the sensor output signals, we need different signal conditioning circuits like  instrumentation amplifier , V to F, F to V , inverting , non inverting amplifier , comparator , schmitt trigger etc. that  work on  the signal to make it compatible to connect either with ADC, or with microcontroller for further processing.

We will cover this in my next post. Please stay tuned.

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