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How to interface uln 2003 with at89s52

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Ravipratap

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I' m making a line follower using at89s52 and now i'm facing difficulty in interfacing
uln 2003 with motor and microcontrollers. When i connects the power supply to uln2003 it start heating up. does it true that l293d works better with PIC and AVR microcontroller rather than at89s52.
 

Ravipratap said:
I' m making a line follower using at89s52 and now i'm facing difficulty in interfacing
uln 2003 with motor and microcontrollers. When i connects the power supply to uln2003 it start heating up. does it true that l293d works better with PIC and AVR microcontroller rather than at89s52.
Click to expand...
You connect the power supply to common (pin9) and not to OUTPUTs. The loads would have battery on one side and other side connects to the output pin of ULN2003. Also across the motor winding there would be a 1N4007 diode, in the reverse. Specific details of various modes are indicated on page 4 of the ST datasheet for ULN2003.
All the best
 
i feel there is no point in allowing the back emf of the coil to reach the diode inside the chip for bypass
If I were to do, i shall definitely have fast acting diodes (like Fast recovery types) close to coil pins.
 

Ravipratap said:
I' m making a line follower using at89s52 and now i'm facing difficulty in interfacing
uln 2003 with motor and microcontrollers. When i connects the power supply to uln2003 it start heating up. does it true that l293d works better with PIC and AVR microcontroller rather than at89s52.
Click to expand...
The heat generated is directly proportinal to the load you apply. You never mentioned what or which motor you are driving with ULN2003 or its consumption.
 

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