Interfacing with 89S52 and L293D

[Rutunayak]

hello sir, when i control L293D chip with 89S52 using switches don't know why my controller does not work. when i check L293D and Micro controller circuit separately on bread board it separately worked, but when i try to control DC motor movement via controller my controller fail, i feel that 12 volt driver supply may b affect controller, so i separate out controller as well driver supply, now my driver circuit works on 12V supply and controller works on 5V. even i did not connect any of enable pin of my motor then also my driver circuit works properly.. i don't know why my controller fail, i already lost my 5 controller, but still did not get the what is the problem

 

[pranam77]

Could you explain how did you test the L293 independently?
What motors are you using?
How did you confirm the 89S52 is working fine?
Cheers

 

[nikhildascl]

Please post your circuit here

 

[pcsandhya82]

Hi,

Please post the circuit.

 

[ud23]

https://www.electroons.com/8051/electroons/dc_motor_control.html

please take above link as reference and if your motor is DC motor and operated at +5v then you don't need two separate power supply. and if you are using two different power supply then try use op-to isolation.as MR. nikhildas suggested please attach your circuit to help you more accurate and helpful for finding problem.