TO ALL WELCOME

A.I.T.S EC-6 TH SEM PREPARED BY: MAYANK G. SAKARIYA RAVI J. BHIMANI INTERNAL COLLEGE GUIDER ‘NIRAJ V. BHADRESHA’ IDP PROJECT CELLPHONE-BASED REMOTE CONTROLLER FOR WATER PUMP

Guider Name Mr. Girdharbhai Patel Bathtouch Metals Pvt Ltd. Plot no G-1611, F Road, Metoda G.I.D.C Kalawad Road Rajkot , Gujarat India Prefer company for this IDP project CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP

OBJECTIVE CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP Inconvenience in switching on a water pump installed in a remote industry is a common problem faced by employer. Many circuits have been developed to solve this problem. Most of them are expensive and microcontroller-based. Here we present a cellphone-based remote controller for water pump. By calling the cellphone attached to the controller, the water pump can be directly activated.

‘GENERAL BLOCK DIAGRAM’ CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP

Concept of project Here two cell phones are used. When industry employer calling the cellphone attached to the controller, the water pump can be directly activated. Not required to go to go any special control place. CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP

Circuit Diagram of ‘CELLPHONE BASED REMOTE CONTROLLER FOR WATER PUMP ’ CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP

WORKING OF PROJECT CIRCUIT Previous slide shows the circuit of cellphone-based remote controller for water pump. The circuit is built around DTMF decoder IC MT8870 (IC1), timer NE555 (IC2) wired as monostable multivibrator and a few discrete components Once monostable timer IC2 is triggered, its output goes high for the pre-set time period. The time period depends on the values of resistor R7 and capacitor C4. It can be adjusted between 8 and 50 minutes using pot-meter VR1. The high output at pin 3 of IC2 energises relay RL1 to switch on the water pump. The triggering pulse for IC2 is generated by DTMF decoder IC1 and the arrangement of diodes D1 through D5. STD pin of IC1 provides a high pulse when a valid tone-pair is received. Transistor T1 conducts only when outputs Q0 through Q2 and Std are high simultaneously. This can be achieved by sending digit ‘7’ through DTMF. CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP

Features CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP No need to point the remote to the device as in infrared remote. Not limited by distance [range] as in RF [Radio frequency] remote. Microcontroller and GSM based operation.

Timer IC 555 as a monostable Here (see fig) the IC works in a monostable or "single-shot" mode. Initially the attached external capacitor stays discharged internally (through a transistor). A negative trigger less than 1/3 VCC applied at pin #2 initiates a flip- flop action, quickly discharging the capacitor and subsequently driving the output high. This results in an exponential increase in the voltage across the capacitor. The time period of this change can be expressed through the formula, t = 1.1Ra.C. The capacitor is fully charged after this period when the voltage across it finally reaches 2/3 VCC. CELLPHOE-BASED REMOTE CONTROLLER FOR WATER PUMP The flip-flop is then reset back by the internal comparator stage of the IC, resulting in an immediate discharge of the capacitor and ultimately the output shifts to logic low state.