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This project uses just three main components to provide forward and reverse control for a single motor. You can easily interface it to an Arduino or ...
All parts are available at Radio Shack - expect to pay a bit under $9 for the main components. The same parts are available online for under $4. 12VD...
This circuit uses a DPDT (Double Pole Double Throw) relay to switch which direction the motor is turning. The motor is connected to both normally clo...
Position the relay in front of you as shown in the picture. Use a piece of hookup wire and your soldering iron to connect the pins as shown. This co...
Again - use a piece of hookup wire and your soldering iron to connect the pins shown. This connection bridges the other Normally Open (NO) and Normal...
One last time - use a piece of hookup wire and your soldering iron to connect the pins shown. This connects one of the relay's Coil pins to one of it...
Solder the middle pin of one of the TIP120s to the relay pin on your lower right (as pictured). This connects the TIP120 Collector pin to the relay's...
Carefully push the TIP120 towards your left and against the relay as shown. This isn't just cosmetic - the TIP120 needs to be in this position for a ...
Solder the middle pin of the second TIP120 to the bottom pin second from the left on the relay (as pictured). This connects the second TIP120 Collect...
Push the second TIP120 up against the relay's case. Bend the left-most pin of each TIP120 towards each other until they touch. Solder the pins toget...
Trim the leads of two 220 Ohm resistors to about 1/4 inch using scissors. Solder a resistor to the end of the right-most pin of each TIP120 as pictur...
Congratulations! You've completed the basic wiring - let's review how to hook things up. + Power Connect this pin to your power source of 7.5v or hi...
Connect all leads as listed in the prior step using hookup wire and your soldering iron. Be sure to connect the GND pin to Ground on both your power ...
Place the code below in an Arduino sketch - and upload it. If you're not using an Arduino - review the code below to figure out what's going on. It'...
If you're having problems with the controller refusing to reverse - it may be that your input voltage is too low. The relay's coil seems to dictate t...
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