Though the bypass capacitors are integrated in the L293 output drives.
Sorry for the typing mistake. Not CAPACITORS but DIODES.No "bypass capacitors" integrated in the L293D driver, just the flyback diodes (snubber diode) are internal in L293D.
Sorry for the typing mistake. Not CAPACITORS but DIODES.
Put 330 ohm resistors in series to outputs of microcontroller for safety. For example, in case input of motor driver ic is semi damaged and drawing excessive current or there is accidental shortage on board.
Put a resistor in series to +ve supply to microcontroller and put 5V zener diode and 104 capacitor between +ve and ground of microcontroller. Diodes are built in. Put .1uF( 104) capacitors on supply near every deviceNo "bypass capacitors" integrated in the L293D driver, just the flyback diodes (snubber diode) are internal in L293D. The voltage spikes can damage the semiconductor chips that control the driver in absence of decoupling capacitors and sharing the same power supply.
This is the cause. Microcontroller needs 5V so if you put a resistor like 47 ohm in series with supply and 5V zener on microcontroller pins and bypass capacitors as earlier stated wiil solve the problem. Motor acts as generator, putting spikes on power lines.Now current will be limited and zener diode will regulate.
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