Surveillance Car Controlled via internet By : Mohammed Sulaiman conain Introduction: • This surveillance car can be controlled over the Internet or on any private network. It uses a DTMF module which takes its input from a mobile phone attached to the car, that mobile is not only used to generate DTMF tones but also for the surveillance by prov iding Live Footage from its camera, over the network using AirDroid. Components & Requirements: • DTMF decoder module 3.5mm audio cable (for connecting mobile to DTMF module) Arduino Uno Chassis Android Phone Laptop Geared DC motors with Wheels L298 motor d river module Android apps Airdroid, Teamviewer quick support • Applications on laptop Airdroid, Teamviewer Block Diagram • Remote section: the here main component is DTMF. Here we get a tone from our cell phone by using an aux wire to DTMF Decoder which decodes the tone into a digital signal of 4 bit. • Control Section: Arduino reads com mands sent by DTMF Decoder and compares them with defined code or pattern. F or the specific decoded digital value the Arduino sends a uniqu e signal to the motor driver. • Driver section: driver section consists of a motor driver and two DC motors. The motor driver is used for driving motors because the Arduino does not supply enough voltage and current to the motor. So, we add a motor driver circuit to get enough voltage and current for the motor. By collecting commands from the Arduino motor driver drives the motor accordi ng to commands. Circuit Diagram • Description of circuit: • DTMF decoder module using MT8870DE and connected to Arduino as shown in the circuit diagram. Pin8 of the Arduino is connected to the STD pin of the DTMF module, it becomes high whenever a new signal ( valid tone) is given to the module. Tones were generated via mobile phone and were fed as input to the DTMF decoder module using the 3.5mm audio jack. • For motor driver use L298D module here M11, M12 and M21, M22 are connection for LEFT and RIGHT motor re spectively when the car is seen from back to front when M11=M21=HIGH and M12=M22=LOW car will move forward. PWM1 and PWM2 are the pins that can control the left and right motor's speed. Vcc for DC motors was connected from a +12v supply. • Phone is mounted on a servo motor. The data pin of the servo is connected to pin5 and +5v is taken from the +5v supply Finished model: Working DTMF - controlled robots run by some commands that are sent via mobile phones . We are here using the DTMF generator app for mobile phones. Here we have used the mobile phone to show the working of the project. Since calling is not feasible, we are using the app. The mobile is connected w ith Robot’s circuit using an aux wire. • First, we connect the phone and the laptop by TeamViewer and launch the DTMF generator. • The controls are 2 forward,5 backwards,3 forward right,1 forward left,6 backward right, and 4 backward left. • Airdroid app is used to ge t a live video feed from mobile