H Bridge Starter Idea

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~ Andrew
Posts: 32
Joined: Tue Apr 03, 2018 4:35 pm

H Bridge Starter Idea

Post by ~ Andrew » Fri May 25, 2018 8:17 pm

Here are some starter bread and butter bread~board basics for controlling motors...
~ Andrew
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H Bridge - Basic.doc
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~ Andrew
Posts: 32
Joined: Tue Apr 03, 2018 4:35 pm

Re: H Bridge Starter Idea

Post by ~ Andrew » Fri May 25, 2018 8:22 pm

This idea shows how it is possible to control TWO motor F/R from just 2 Pins.
If you make the OP pin an input the motor also STOPS.
Cute starter idea for a cute robot perhaps ?
~ Andrew
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Dual_H_Bridge.gif
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~ Andrew
Posts: 32
Joined: Tue Apr 03, 2018 4:35 pm

Re: H Bridge Starter Idea

Post by ~ Andrew » Fri May 25, 2018 8:25 pm

Here is the Single Pin Warp Drive circuit for one pin / one motor.
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H Bridge - Single Wire Sch.jpg
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~ Andrew
Posts: 32
Joined: Tue Apr 03, 2018 4:35 pm

Re: H Bridge Starter Idea

Post by ~ Andrew » Fri May 25, 2018 8:34 pm

And this one has "Current Sense" by just adding a 1 ohm resistor:
A few handy rules of thumbs:
- RPM is proportional to Voltage
- PWM to a motor just looks like a perfect changing DC voltage and will change the RPM nicely
- Current is proportional to then Torque / Load on a motor. This can be used to detect a lift overload, bot bumping into a wall etc with NO extra sensors other than a 3 cent one ohm resistor :)
- The Instantaneous start current of a motor is the same as the motor being STALLED ! So think about that and make sure your power supplies and H Bridges and Transistors can handle this ! If not the circuit will heat up, burn out or 'GLITCH' and jitter.....
~ Andrew
Attachments
H Bridge - Single Wire - Current Sense.jpg
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