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These are devices that are designed to monitor or scan a specified region or a parameter and produce a warning indication as soon as an unfavorable situation or condition is detected.
These types of monitoring gadgets use specialized sensors to track a given set of parameters which continuously record the proceedings and quickly intimates the attached processor to trigger a warning alert to the user regarding the incident.
You will find various forms of sensors involved in many crucial electronic devices, the most common of these are PIR sensors, infrared sensors, microprocessors based data loggers, while other applications may involve weather monitoring sensors such as barometric sensors, pre-programmed DTHXX sensors etc.
The following posts provide a detailed explanation regarding many such electronic monitoring devices which can be easily built by any interested enthusiast to execute the checking of various complex sets of variables and to gather the important relevant information from the data.
The post discuses two simple motion detector circuits using op amp and transistor. We also discuss the pinout details of the standard passive infrared (PIR) sensor RE200B. The first circuit uses an op amp, while the second design works with a single transistor and relay for detecting the IR radiation from a moving human body … Read more2 Simple Motion Detector Circuits using PIR
The post explains a simple sound to flashing lamp circuit which can be used for facilitating people with hearing loss, so that they are able to visualize a distant cell phone rings through flashing of a lamp, and immediately understand regarding an incoming call in their cell phone. The following explanation and the circuit design … Read moreCell Phone Ring to Flashing Lamp Indicator for People with Hearing Loss
Three useful proximity sensor concepts are explained here, the first concept is based on an ordinary opamp LM358, the second one using IC LM567 which functions with a phase locked loop principle ensuring very accurate response for the detection. The third circuit works using the ubiquitous IC 555. Let’s learn each one with a step … Read more3 Simple Proximity Sensor Circuits
In this post we are going to construct a circuit which can detect color and trigger respective assigned relays. This project is accomplished using TCS3200 color sensor and Arduino board. Color Sensing by TCS3200 If you haven’t read the previous article, please go through it where we have discussed the basics of color sensing using … Read moreColor Detection Controlled Relay Switching Circuit
We know that the center or band-pass operating frequency of a TSOP17XX IR sensor is assigned to a particular frequency which makes it difficult to use these sensors for designing unique or customized frequency based remote control circuits. In this post we will try to figure out an idea for enabling these sensors to work … Read moreUsing TSOP17XX Sensors with Customized Frequencies
In this post we learn how to correctly connect an IR photodiode in circuits such as a proximity sensor circuit. The explanation is presented in the form a discussion between one of the dedicated readers of this blog NVD, and me. Here’s the discussion which explains how to connect a photodiode in an electronic circuit. … Read moreHow to Connect an IR Photodiode Sensor in a Circuit