Connecting an L293D H-Bridge to a DC Motor: Advice Needed

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SUMMARY

The discussion centers on connecting an L293D H-Bridge to a 12V DC motor using a PIC 16F877A microcontroller. The user inquires about connecting the H-Bridge to a 15V rail, which is acceptable as the L293D can handle up to 36V. It is crucial to limit the PWM signal to achieve an effective voltage of ±12V, ideally using an 80% duty cycle to ensure proper motor operation.

PREREQUISITES
  • Understanding of H-Bridge operation and specifications
  • Familiarity with PWM signal modulation
  • Knowledge of the PIC 16F877A microcontroller
  • Basic electronics concepts, including voltage levels and breadboarding
NEXT STEPS
  • Research PWM signal generation techniques for motor control
  • Study the L293D datasheet for detailed specifications and limitations
  • Explore circuit design for interfacing microcontrollers with H-Bridges
  • Learn about voltage regulation methods to achieve desired motor voltage
USEFUL FOR

This discussion is beneficial for hobbyists, electronics enthusiasts, and engineers working on motor control projects, particularly those utilizing microcontrollers and H-Bridges.

axe34
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Hello

I was wondering if you could advise me on the following. I am undertaking a personal project at home (mainly mechanical in nature) whereby I require the L293D H-Bridge to connect to a 12 V DC motor. I'm using a PIC 16F877A microcontroller. This microcontroller has a 5V output. The breadboard I have has a 15V but no 12 V rail.
Can I connect the H bridge to the 15V rail and ground rail? Will the DC motor work ok?
I have studied the data sheet but I'm still confused!Thankyou
 
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axe34 said:
Can I connect the H bridge to the 15V rail and ground rail? Will the DC motor work ok?
Yes, just limit the PWM-signal to yield ±12V ( ±80% duty cycles ).

The limit as for the bridge itself is 36V.
 

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