89c51 gets really hot

[rock kimaili]

hi all. I was using an 89c51 uc to run dc motors (2) and interfaced them with l293d.
the only problem is that when I power the circuit with 5v the uc gets very hot. iam sure that the software is okay. can anyone give suggestions as to what I should do. I have used a mobile charger to power the circuit since it gives a constant 5v . pls help.

[Ashutosh Bhatt]

certainly there should be any other problem some where else.

use regulated 5 V supply for micro controller using 7805 chip. do not use any other.

one more thing if micro controller gets hot it might got burnt.

[rock kimaili]

hi, bhatt. my project is about a GSM controlled robotic arm to be mounted on an UNMANNED GROUND VEHICLE. A dtmf decoder is used to produce an interrupt that will trigger the microcontroller to call on a subroutine. i have compiled the program using keil IDE. WHich was successful. the problem is is that when the motors start running the microcontoller gets realy hot.  i have used a transistor on pin 15 of dtmf decoder 2n222a. when i interchange the terminals i.e collector goes to ground and emmiter goes to interrupt 1 pin the uc does not get hot. any suggestion anyone?

has anyone attempted such a project , pls your advice will be appreciated.

[Ashutosh Bhatt]

the micro controller only gets hot when you apply input more than specified or you try to take output current more than specified. dont give input more than Vcc

I have build this project. you can take help form this

http://www.engineersgarage.com/contributionn/ambhatt/cellphone-operated-robotic-arm

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