Group Assignment

In the group assignment we read the values of both soil sensor and microphone sesnor plus potentiometer. I'll document the soil sensor and microphone sensor.

Measuring Analog Signal

First me an Doaa took thesoil sensor and started and use a simple code to display the reading of the sensor on the serial plotter and watched the fluctuations. We could see the transition from ~+1000 to ~800 once she put it in the water but we saw the noise as well.

This is logical since the probe is an exposed conductor that acts like a potentiometer its resistance vary inversely with the moisture. When Doaa put it in the water, its conductivity got higher, therefore the resistance was lowered. The sensor produces an output voltage based on the resistance

Measuring Digital Signal

The Microphones are devices that convert the sound energy into electrical energy. Their sensors help an electronic product capture sound waves. The type we use is an Electret microphone (ECM). They use electrostatic and magnetic properties to function with an electret diaphragm that acts as a single capacitor plate. Once a signal is captured due to variation in capacitance, it's amplified.

We measured the signal raw at first and THE NOISE was Maddening, so Saeed introduced us to the art of calibrating our sensors with coding. We tuned the readings until it showed only the signal.