Difference between revisions of "Cheap ULN2803A Motor Driver"
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Dirknerkle (talk | contribs) (Created page with "If the DC motor you need to control requires 500ma or less, here's a cheap way to drive it. A typical, small hobby motor that needs 3.3vdc, 5vdc or even 12vdc is an example. T...") |
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| − | + | :Normally, a PIC or other chip can't output enough current and/or voltage to drive a DC motor, and if the DC motor you need to control requires 500ma current or less, or if it requires more more than 5vdc power, here's a cheap way to drive it. A typical, small hobby motor that needs 3, 5, 7, 9 or 12vdc is an example. To start, here's an outline of connections to the ULN2803A: | |
| − | [[File:Cheap motor driver.png | | + | [[File:Cheap motor driver.png | 350px|center]] |
| − | And here's how you'd connect your controller to it: | + | :And here's how you'd connect your computer or controller to it, using input #1 as an example: |
| − | [[File:Cheap motor driver example.png | 350px|center]] | + | [[File:Cheap motor driver example.png | 500px|center]] |
| + | |||
| + | :Here's an example of one compact driver design that was made on an experimenter's breadboard. This includes header pins for connecting Dupont cables, and the short row of 4 pins at the end of the chip are common to each other, making for an easy way to connect multiple grounds. | ||
| + | |||
| + | [[File:Sample driver.JPG | 350px | center]] | ||
| + | |||
| + | :'''Additional information:''' | ||
| + | |||
| + | ::* Any controller's PIC that outputs a positive control signal should work. | ||
| + | ::* The ULN2803A could conceivably control up to 8 motors, depending on their current draw (total < 500ma) | ||
| + | ::* Multiple inputs and outputs can be chained together for more current capacity. The total dissipation of the ULN2803A chip is slightly more than 2 watts. | ||
| + | ::* The motor speed can also be controlled further by using common PWM in the +v control signal. | ||
| + | ::* The ULN2803A has a maximum voltage rating of 50vdc. | ||
| + | ::* The ULN2804A is a drop-in replacement that can handle higher current than the 2803A. | ||
Latest revision as of 13:05, 10 December 2018
- Normally, a PIC or other chip can't output enough current and/or voltage to drive a DC motor, and if the DC motor you need to control requires 500ma current or less, or if it requires more more than 5vdc power, here's a cheap way to drive it. A typical, small hobby motor that needs 3, 5, 7, 9 or 12vdc is an example. To start, here's an outline of connections to the ULN2803A:
- And here's how you'd connect your computer or controller to it, using input #1 as an example:
- Here's an example of one compact driver design that was made on an experimenter's breadboard. This includes header pins for connecting Dupont cables, and the short row of 4 pins at the end of the chip are common to each other, making for an easy way to connect multiple grounds.
- Additional information:
- Any controller's PIC that outputs a positive control signal should work.
- The ULN2803A could conceivably control up to 8 motors, depending on their current draw (total < 500ma)
- Multiple inputs and outputs can be chained together for more current capacity. The total dissipation of the ULN2803A chip is slightly more than 2 watts.
- The motor speed can also be controlled further by using common PWM in the +v control signal.
- The ULN2803A has a maximum voltage rating of 50vdc.
- The ULN2804A is a drop-in replacement that can handle higher current than the 2803A.