| OSTRON Motor control Circuits: |
| Just about every true robotics builder and electronics buff is familiar with the common H- bridge and dual polarity power supply transistor configuration for controlling motors, though these ideas work in some cases I've found they waste power and the "wiring" is somewhat overly complex for a motor control circuit. Through much tinkering i've found that the tried and true simple relays do the job quite easily and more efficienly than do transistors. Unless you are using a dedicated IC chip for motor control, relays appear to be the way to go for motor control of a hobby robot. |
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| Below are a couple of relay drive circuits I was planning on using for motor control of head movement on Ostron. The first one uses a single pole double throw relay together with a double pole double throw relay to control motor clockwise, counter-clockwise, or stop depending on the two input nodes( CW and CCW). The second uses two double pole double throw relays that does the same job as the first but is a simpler design and is easier to build. The only drawback with this design is the possibility of a short circuit occurring if both DPDT relays come on at the same time. Of course this disallowed state must be taken care of in the control circuitry. The first design with the single pole-double pole arrangement does not have this problem. |
| SPDT with DPDT relay motor control circuit: |
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| Dual DPDT relay motor control circuit: |
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