#ht12d decoder

Remote operated spy robot vehicle can be controlled by using a wireless remote controller. It can capture audio and video information from the surroundings and can be sent to a remote station through RF signals. The maximum range is 125meters. It overcomes the limited range of infrared remote controllers. HT12e encoder, HT12d decoder, RF433MHz transmitter and receiver modules are used for the spy robot and the remote control. H Bridge circuits are used to drive two 12V motors. By pressing any key in remote controller, the HT12e encoder generates 8 address bit and 4 data bit. The RF module transmitter sent them and RF module receiver receives. And then HT12d decoder decodes the data and generates the output signals to control the L293D motor driver which then rotates the motors and wheels of spy robot vehicle. In this research, DC power supply is taken from the battery placed on the robot. The camera is placed on spy robot. Its audio and video output signals are directly sends from a SIM router. These information are received and caught to a phone, PC or TV in the remote station through internet.