In this post we are going to explore the datasheet of PIR or Pyroelectric Infrared Radial Sensor HC-SR501. We will understand for what purpose PIR sensor is used? Its basic operation, its technical specifications and finally we will be looking at some real life applications. By Girish Radhakrishnan and Swagatam We will begin by understanding […]
Home Security Devices
Patient Drip Empty Warning Indicator
In this post we will learn about a simple mechanism, and a circuit which will enable a patient’s IV drip bottle system to sound an alarm whenever it gets almost empty, and needs a replacement. The warning circuit will help doctors and the concerned employees to concentrate on other important matters while the drip systems […]
Smart Laser Alarm Protection using IC 555
The post discusses the making of a simple yet effective smart laser alarm protection circuit using the IC 555, for securing a specified restricted zone from human interventions. The idea was requested by Mr. Collins. Protecting Home with Laser Alarms I just want to tell you what an amazing passion and dedication to electronics you […]
Mains High Low Voltage Protection with Delay Monitor
The post explains an upgraded version of my previous mains 220V/120V high-low voltage cut off protection circuit which now includes a delayed restoration of power for the load with 3 LED power status indicators. The idea was requested by one of the dedicated members of this website. Protection for household Electrical Appliances I just followed you’re […]
Intruder Position Indicator Security
The post explains an LED based intruder position indicator circuit which will indicate the position of the burglar throughout the secured corridor as the person tries to sneak past the area.The idea was requested by Mr. Michael. Requesting a Intruder Position Indicator Security Circuit Your articles are nice, well done. sir can this, close and open […]
SMS Based Laser Security Project
In this post, we are going to construct a laser security circuit which can send SMS alert to owner of the property or anyone else and activate loud alarm to deter the crook, which can be interfaced via relay. By: Girish Radhakrishnan We always fear about crooks especially when we leave our property alone, this […]
Material Storage Level Controller
The post discusses a simple material storage level controller circuit which can be used for automatically activating and deactivating a storage filling motor whenever the storage container is filled to its stipulated threshold level. The idea was requested by Mr Sladjan. Laser Beam Controlled Storage Filling I need help with the engine control filling storage […]
RFID Security Lock – Full Program Code and Testing Details
In this article we will see how an Arduino based RFID reader circuit could be used for controlling a relay, which in turn could be used in security door lock applications. By: Girish Radhakrishnan Overview If you haven’t yet checked the previous RFID article, please go ahead check it out, it covered the basics of […]
Magnetic Door Security Alarm for Alerting if Door was Opened
The door security alarm circuit discussed in this article alerts the user whenever the door fitted with the circuit is opened or closed or even moved from its original locked position. Using a Reed Relay and Magnet for the Triggering The idea utilizes the very basic reed relay and magnet concept across the door and […]
GSM Fire SMS Alert Project
In this article we are going to construct a GSM fire alert circuit system using Arduino and DHT11 sensor, which will alert the user via text message (SMS), regarding a fire hazard within the premise where it is installed. By: Girish Radhakrishnan Using DHT11 Sensor We are using DHT11 sensor for sensing unusual temperature rise […]
Laser Activated GSM Call Alert Security
In this post we discuss a simple laser GSM call alert security circuit which immediately calls the master as soon as an intruder is detected through a laser beam interruption. The idea was requested by Mr. Roldan. Burglar Alarm using Laser Good day to you sir swagatam, I am roldan from Philippines. I am so […]
Foolproof Laser Security Alarm
The post discusses a a simple yet versatile foolproof laser security alarm circuit which can be used for securing any concerned premise with extreme accuracy. The idea was requested by GPS. Technical Specifications Your circuits were very useful to me. Thanks for all your posts, but i wanted something different now. I made Transistor Latch […]
Make this SleepWalk Alert – Protect yourself from Sleepwalking Dangers
Do you have a habit of walking in night? Well, that habit isn’t that good, so one must try to get rid of it gradually. This article discusses a simple sleep walk alert circuit that might help you in getting out of this habit. By: SS Kopparthy Circuit Objective This circuit is a simple idea […]