Rongge

             This project is a robot vehicle that can be controlled through any computer wirelessly using a WiFi link. It transmits real-time video to the controlling computer using the same link. The video transmitting camera mounted on it. It also has obstacle detection,temperature,sound and light sensitivity feature.           Usually robots are controlled through a laptop using an WiFi link which is subject to attenuation, noise and has a very limited range as well. This project features a robot that uses WiFi 802.11G standard for its control signals through TCP/IP protocol, which has flow control. This enables uninterrupted and reliable transmission of control signal to the robot vehicle. WiFi support high data rates which enables good quality uninterrupted video transmission from the robot to the computer. Image capturing is done by mounting an IP-camera over the Robotic Car. Obstacle detection is done...

Description This circuit is self explanatory and it is fairly simple, the temperature sensor used in this circuits are not thermistors but they are nothing but the signal diodes, the variation of the resistance according to increase or decrease in temperature sets the operational amplifier which drives the transistor Q1 which inturn gives the base voltage to transistor Q2 and their by the fan is switched on and off.  Circuit Diagram Source -http://www.electronguide.com/circuits_pages/TEMPRATURECONTROLLEDFAN.html

Here is simple electronic circuit Project of phase-controlled dimmer circuit. A phase-controlled dimmer delays the triac turn-on to a selected point in each successive ac half cycle. Phase-Controlled Dimmer Circuit Diagram:   Use this circuit only for incandescent lamps, heaters, soldering irons,or universal motors that have brushes.

Circuit Description: Ever Imagined controlling your home appliances using your cell phone. You can find a lot of circuits for this application. But they make use of Telephone. I modified the circuit and redesigned it to make it compatible with normal cell phone headphone. Just connect the your phone headphone jack to the phone and the connections to the circuit as shown in the circuit. The relays are connected using the resistor and transistor. Use ULN2803 to reduce the circuit size and increase the performance. The connections from the output of flip-flops has to be given to the inputs of the buffer and relays has to be connected to the buffer. Normally the tip of the headset is connected to the circuit to the 0.1uF capacitor as shown in the circuit diagram. The ground pin of headphone is connected to the ground of the circuit. Circuit Diagram: Operation: When you press keys in your Phone, the other person will hear some tones with respect to keys pressed. This tones are based on the ...

This is a very low cost and basic from of home automation allowing you to turn on and off lights and other devices using your computer or mobile phone. It has been built and tested use using UK power plugs, but the same protocol is used on many budget remote power switchers from around the world. [ ]

Description This temperature controlled relay circuit is a simple yet highly accurate thermal control circuit which can be used in applications where automatic temperature control is needed. The circuit switches a miniature relay ON or OFF according to the temperature detected by the single chip temperature sensor LM35DZ.  When the LM35DZ detects a temperature higher than the preset level (set by VR1), the relay is actuated. When the temperature falls below the preset temperature, relay is de-energized. The circuit can be powered by any DC 12V supply or battery (100mA min.)   Circuit Diagram How it works? The heart of the circuit is the LM35DZ temperature sensor which is factory-calibrated in the Celsius (or Centigrade) scale with a linear Degree->Volt conversion function. The output voltage (at pin 2) changes linearly with temperature from 0V (0 o C) to 1000mV (100 o C). The preset (VR1) & resistor (R3) from a variable voltage divider which sets a reference voltag...

             This project is a robot vehicle that can be controlled through any computer wirelessly using a WiFi link. It transmits real-time video to the controlling computer using the same link. The video transmitting camera mounted on it. It also has obstacle detection,temperature,sound and light sensitivity feature.           Usually robots are controlled through a laptop using an WiFi link which is subject to attenuation, noise and has a very limited range as well. This project features a robot that uses WiFi 802.11G standard for its control signals through TCP/IP protocol, which has flow control. This enables uninterrupted and reliable transmission of control signal to the robot vehicle. WiFi support high data rates which enables good quality uninterrupted video transmission from the robot to the computer. Image capturing is done by mounting an IP-camera over the Robotic Car. Obstacle detection is done...

Audio Controlled Mains Switch Circuit Diagram. It is often useful for audio or video equipment to be switched off automatically after there has been no input signal for a while. The function of the on-off switch in such equipment is then taken over by switch S2 in the accompanying diagram. It remains, however, possible to  switch off manually by means of Si. Automatic  switch-off occurs after there has been no input  signal for about 2 minutes: this delay makes it possible for a new record or cassette to be placed in the  relevant machine.   The audio input to the proposed circuit may be  taken from the output of the relevant TV set, amplifier, or whatever. The input earth is held at + 6 V  with respect to the circuit earth by potential divider  Ri-R2-R3-R4. The two 741s function as comparators: the output of ICi goes high when the in- put signal is greater than + 50 mV, whereas the out- put of IC2 goes high when the input signal  becomes mor...