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Step 3How it works.
The H-bridge we are making uses relays.
What this means for you is that the motor will spin as fast as it can in one direction and then when reversed, spin as fast as it can in the other direction. The only thing that will slow down the spin of the motor is if you have a controller that can modulate the 9VDC the power signal BEFORE it enters the H-bridge.
When the coils on "Relay 1" and "Relay 4" are pulled high (electricity is flowing through them), then the motor will spin forwards (see "Image 1").
When the coils on "Relay 2" and "Relay 3" are pulled high (electricity is flowing through them), then the motor will spin backwards (see "Image 2").
When the coils on "Relay 1" and "Relay 2" are pulled high (electricity is flowing through them), then the motor will stop spinning (see "Image 3").
When the coils on "Relay 3" and "Relay 4" are pulled high (electricity is flowing through them), then the motor will stop spinning (see "Image 4").
********WARNING***********
You want AVOID:
"Relay 1" and "Relay 3" being pulled high. This is a short circuit since there is no load for the electricity to pass through. Bad things will happen! (see "Image 5")
"Relay 2" and "Relay 4" being pulled high. This is a short circuit since there is no load for the electricity to pass through. Bad things will happen! (imagine "Image 6")
More than 2 relays being pulled high at one time. Bad things will happen.
What this means for you is that the motor will spin as fast as it can in one direction and then when reversed, spin as fast as it can in the other direction. The only thing that will slow down the spin of the motor is if you have a controller that can modulate the 9VDC the power signal BEFORE it enters the H-bridge.
When the coils on "Relay 1" and "Relay 4" are pulled high (electricity is flowing through them), then the motor will spin forwards (see "Image 1").
When the coils on "Relay 2" and "Relay 3" are pulled high (electricity is flowing through them), then the motor will spin backwards (see "Image 2").
When the coils on "Relay 1" and "Relay 2" are pulled high (electricity is flowing through them), then the motor will stop spinning (see "Image 3").
When the coils on "Relay 3" and "Relay 4" are pulled high (electricity is flowing through them), then the motor will stop spinning (see "Image 4").
********WARNING***********
You want AVOID:
"Relay 1" and "Relay 3" being pulled high. This is a short circuit since there is no load for the electricity to pass through. Bad things will happen! (see "Image 5")
"Relay 2" and "Relay 4" being pulled high. This is a short circuit since there is no load for the electricity to pass through. Bad things will happen! (imagine "Image 6")
More than 2 relays being pulled high at one time. Bad things will happen.
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