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I have a circuit block (Let's name it as block A) with a set of GPIO pins. The HIGH state of these GPIOs are 3v. I have a motor bridge that requires 5v input to set its (motor bridge's) GPIO to HIGH.

What I am trying is, when the GPIO pin in block A is HIGH, make the motor bridge's GPIO pin HIGH as well. When I connect the two pins directly (block A pin to motor bridges pin) motor bridge circuit did not detect the pin as HIGH. However, when I give 5v input to the bridge's GPIO pin it works. And I know block A GPIO's are only outputting 3v (when set to HIGH).

So how can I solve this? Do I need to use something like a step-up transformer or use a transistor as a switch?

Is there a simple way to solve this?

Appreciate your thoughts.

EDIT: (Additional info) I have a 5V power supply to the motor bridge circuit. That can be used if required.

Mad
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    Not a Pi specific question. This applies to all devices which provide less than 5V at the GPIO. Use a transistor as a switch. Feed it 3V3 and it will switch 5V. Look online for circuits. Or buy a voltage translater chip. – joan Mar 24 '23 at 16:11
  • Oh, is this a duplicate then? https://raspberrypi.stackexchange.com/questions/41173/how-to-switch-on-off-a-circuit-using-gpio?newreg=b100db79d2444a7ab62c59f16e85ed6f – Mad Mar 24 '23 at 16:15
  • Or a level shifter https://thepihut.com/products/sparkfun-logic-level-converter-bi-directional?variant=41531949908163¤cy=GBP – CoderMike Mar 24 '23 at 17:10
  • Look up the thresholds of the thresholds of the IC families such as HCT. Post a schematic if you can. – Gil Mar 24 '23 at 17:15
  • Does this answer your question? How To Switch On/Off A Circuit using GPIO – Vadim Mar 25 '23 at 09:22

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