Difference between revisions of "Cheap ULN2803A Motor Driver"
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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 | + | :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 | 350px|center]] | [[File:Cheap motor driver.png | 350px|center]] | ||
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:'''Additional information:''' | :'''Additional information:''' | ||
− | ::* Any controller that outputs a positive control signal should work | + | ::* 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) | ::* The ULN2803A could conceivably control up to 8 motors, depending on their current draw (total < 500ma) | ||
− | ::* The motor speed can also be controlled further by using common PWM | + | ::* 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 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 14:05, 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.