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Kenelly Rey Clifford Cadelina, Sheenen Nava and Kim Kevin Rojas sound detection . The clap sound received by the transducer (microphone) is converted to electrical pulse. The amplified pulse is then generated to drive the IC. Changes in the output state of the IC causes the relay to energize or de-energize accordingly. B. Differential Drive Differential drive, which was implemented in Engr. Luis Leonardo Bartolos robot, is usually used to drive indoor mobile robots. This method makes use of two drive wheels, each attached to a motor. When both wheels move at the same direction and speed, translation occurs. On the other hand, when the two wheels move in opposing directions, rotation of the robot occurs.

Abstract— The Clap-Operated Mobile robot can detect loud sounds such as clap and snap with the use of the condenser microphone. This robot also uses a 555 timer in generating delays when it detects sounds. The mobile robot moves or run by using 2 DC motors. The 555 timer controls the delay when it run forward after it receives signal. Keywords - 555 timer, clap switch, condenser mic, DC motor, mobile robot, relay

I. I NTRODUCTION Projects on mobile robots that do not use microcontrollers have been made, some of which include the obstacle-avoiding, edge-avoiding, and clap-controlled mobile robots. One project by Engr. Luis Leonardo Bartolo implements all three features - obstacle-avoiding, edge-avoiding, and clap-controlled - in one mobile robot. His Clap Controlled Mobile Robot With IR Sensor For Edge Detection makes use of IR diodes to detect obstacles and edges to be avoided while a condenser microphone is used to detect loud or sharp sounds. This project aims to build a mobile robot that run upon sensing loud clap sounds and thus focuses on the clap-control feature without implementing the use of a microcontroller. A sound-detecting sensor is used for clap control. The differential drive system is also implemented here. II. R ELATED W ORKS The Clap Controlled Mobile Robot With IR Sensor For Edge Detection built by Engr. Luis Leonardo Bartolo makes use of a sound sensor to detect sharp and loud sounds, two relays to drive two DC motors, an IR sensor to detect edges. For the sound sensor, the use of the 555 timer IC determines how long the relays are activated . The time delay generation of the 555 timer is controlled by an external resistor and capacitor. Moreover, the sensitivity of the microphone in the sound sensor is affected by the capacitor attached to it. The relay attached to the right motor gets activated whenever a sound is detected; it makes the right motor reverse its rotation by inverting the polarity of the supply voltage. Engr. Bartolo recommends that the rotation of the DC motors be not too fast because this can prevent the robot from reacting immediately .

III. O BJECTIVES The general objective of this study is to create a mobile robot that run forward upon sensing loud sounds such as clap or snap. The specific objectives are: 1) To construct a sensor circuit for detecting sounds; 2) To construct a circuit using relay for energizing the DC motors of the mobot; and 3) To make a mobile robot that run on when a clap sound is heard or detected. IV. M ETHODOLOGY The proponents construct a sound sensor cicuit which converts sounds into electrical signal that can be process to produce an output in the relay to make the mobile robot run. Upon receiving the signal, the relay will be activated to turn the polarity of the motor which causes the runing process of the mobile robot. The runing delay is activated by the use of a 555 timer. Fig. 1 shows the over all flow of the clap-operated mobile robot. A. Gathering of Materials There are different procured components for the sound sensor circuit. The circuits major components include a condenser microphone which receives the input signal, a 555 timer IC for...
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