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Human Detection Robot Human detection robot is not a new technology. Many types of human detection robots were designed depending on the application. During the natural calamities like earthquakes, it is difficult to rescue the human beings under the buildings. Though detection by rescue team is done, it consumes a lot of time. Detection of human in appropriate time is very important in such situations. This article presents a simple human detection robot that is operated manually using RF technology. Human Detection Robot Circuit Principle: The main principle of the circuit is to detect the human using human detection sensor. The wireless robot is operated manually using PC. The wireless technology used here is Radio Frequency technology. The data is transmitted to receiver through RF. Using the received data, robot is operated and controlled. Also get an idea about Important Project: Line Follower Robot using Microcontroller Human Detection Robot Circuit Diagr...
Opening a Safety-Cover Toggle Switch with LED I purchased a fighter pilot military toggle switch (the kind with a safety cover) to arm the igniter of a model rocket launch controller . Side view of a covered toggle switch in the unarmed and ready-to-arm positions. I am surprised how much larger the pilot toggle switch is compared to a miniature toggle switch, which is the size that I had become accustomed to using on robots or electronic projects. I’m not sure if anyone sells smaller switch covers for miniature toggle switches. This particular switch is an illuminated toggle switch. There are major differences between a plain miniature toggle switch and the illuminated toggle switch due to the target voltage, internal wiring arrangement, and polarity of the LED in the switch’s tip. Red LED inside illuminated toggle actuator. The manufacturer apparently intends this toggle switch for automotive use, and thus selected an LE...
Infrared Transmitter Project In robotics, infrared is commonly used both in communication and in object detection. (Used for opponent detection in my Bugdozer and Number Two sumo combat robots.) Infrared breadboard and battery Many sources of infrared radiation light up and bounce around the environment. The sun, standard light bulbs, computer monitors, and even visible-light LEDs produce different levels of infrared light. If a device simply relied on the presence or lack of presence of infrared light, the communication or object detection algorithm would receive false and noisy readings. What’s a common way of making a normal LED more noticeable? Blinking! Unique Signal By blinking an infrared LED, the signal becomes more unique and therefore more discernible from other light sources. Even as intensity varies based on lighting, angle and distance, the constant rate of blinking can be relied upon for recognition. ...
Dual Fan Controller My brother plans to install a desktop computer in his kitchen. He’d like to hide the computer in a cabinet so that the computer doesn’t take up valuable counter space. The computer monitor requires a cable, but the keyboard and mouse will be wireless. Heat buildup is a concern anytime a major electrical device is installed in an enclosed space. For the computer in the kitchen cabinet, he plans on adding some external fans in the rear board of the cabinet and perhaps in the front baseboard. However, it isn’t desirable to have the fans turned on all the time, because that would be noisy, dusty, and not very energy efficient. Creating A Simple Fan Controller Over the course of a weekend, I cobbled together some leftover robot parts to create a simple dual-fan controller. The board turns on the first fan when the temperature reaches a user-adjustable dial setting, and it turns on a second fan if the temperatu...
Simple counter using Calculator This is very attention-grabbing idea of using calculator for counter. Using calculator is cheaper and less complicated then the circuit of counter. The components used in this circuit are easily available and can be assembled even by beginners. Circuit Description of simple counter using calculator Two leads from contact of the key “=” is taken out from the calculator. Calculator to be used should be are in which “1”, “+”, and “=” gives ‘1’ and each press of equal key after that would result in the increment of the number by ‘1’. The leads from the calculator are connected to two point of relay through switch SW 1 as shown in figure of circuit diagram. The working of this project is base on the working principle of LDR, when the light fall on LDR the resistance becomes low which operate or activates the relay (RL 1 ) with the help of relay driver transistor T 1 . It is necessary to press “1”,”+”, and”=” keys to s...
Bicolour LED flasher circuit Basically this circuit is similar to some flasher circuits already published in using IC555 as a free running multivibrator. The only difference lies in the way it flash using bi-colour LEDs. When output at pin 3 of IC 555 goes high it operates on group of LEDs. By inverting the IC’s low output by pnp transistor BC558 the other group of LEDs is made to flash. AS shown in circuit diagram the LEDs are arranged in alternately reversed order so that a “twinkle twinkle little stars” effect is produced. The 100K preset VR 1 sets the blinking rate. The circuit diagram for the project is: To maintain simplicity I omitted the current limiting resistor. So, the red and green LEDs may not flash with equal intensity (as they require different threshold voltage). PARTS LIST Resistors (all ¼-watt, ± 5% Carbon) R 1 , R 2 = 1.5 KΩ R 3 = 330 Ω VR 1 = 100 KΩ Capacitor C 1 = 10 µF/10V Semiconductors IC 1...