its urgent reply me.. i need help to design driving ckt for 12v motor

[swathipatilss]

hi i am doing project flying robot. first i am designing driving ckt for 12v dc motor.. i am using 8051 controller.
i am using port 0 as output port, which is connected to buffer4050, out put of buffer is connectd to uln2003 through diode. out put of uln is given to 12v relay
to which motor is connected. by this ckt i am not getting the exact control of the motor by controller.. so please correct if any mistakes are there. i am new to this field.. so please help me...

 

[ckshivaram]

post your circuit???

what do you mean excat control of motor

 

[Senthilkumar_rjpm]

Post ur circuit First. Exact control means? Is motor Partially works? (ie,Forward or reverse). If Yes, Check ur motor connection...

 

[swathipatilss]

post your circuit???

what do you mean excat control of motor

sorry its exact contro.. exact control means controlling the dc motor with a pwm from the controller.. nw i am just trying for a square wave.. see the ckt i have attached it

 

[Senthilkumar_rjpm]

In ur circuit;
Make sure ur relay is ONN while u give supply to circuit...
You can here "Click" sound from ur realy...
Measure Wat is the Output & Input of ULN2003?
Check ur motor Alone with direct supply?

Your cicuit seems not logical..
Plz make Following Corrections;
Use ULN Output to control relay.
Give direct supply to Rly common. It should be control ur Motor.
All the best......

 

[Audioguru]

Pin 1 of the CD4050 is its positive power supply pin. You have it disconnected.