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Passive Infrared (PIR) Motion Sensor Circuit

PIR with delay ON alarm

The post discuses the pinout details of the standard passive infrared (PIR) sensor RE200B and also explains how to make a motion detector circuit using a single transistor and relay, which can detect the IR radiation from human body and activate the attached relay. What is a PIR PIR is the acronym for Passive Infra … Read morePassive Infrared (PIR) Motion Sensor Circuit

Cell Phone Ring to Flashing Lamp Indicator for People with Hearing Loss

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

2 Simple Proximity Sensor Circuits

In this post we learn how to design your own simple yet useful proximity detector circuits using a single opamp LM351 and a couple of infrared diodes. Two concepts are explained here, the first one using an ordinary opamp, while the second one using IC LM567 which works with a phase locked loop principle ensuring … Read more2 Simple Proximity Sensor Circuits

Color Detection Controlled Relay Switching Circuit

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

Using TSOP17XX Sensors with Customized Frequencies

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

How to Connect an IR Photodiode Sensor in a Circuit

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

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