Description: PololA4990 - dual channel 32V/0.65A motor controller - Shield for Arduino.
The module based on the A4990 system allows you to control motors with supply voltages up to 32 V and continuous current consumption up to 0.65 A. The controller can also withstand current peaks of up to 0.9 A for several seconds. The speed can be controlled with aPWMsignal.
In combination withArduino, using a specially preparedlibrary, you can easily control the speed and direction of rotation of two DC motors. The shape and the leads of the board allow direct connection withArduino, as shown in the figures above. The system uses pins 6, 7, 8 and 9 of which 7 and 9 are PWM signals for speed control.
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Arduino compatible product The manufacturer provides alibrary for Arduino users. |
Thanks to the integrated logic gates, both the direction of rotation and the PWM signal can be controlled using the same outputs. This reduces the number of pins required to operate the controller. The truth table shows the available motor modes depending on the logical state at the input terminals:
| MxDIR | MxPWM | MxA | MxB | Mode of operation |
| 0 | PWM | PWM | L |
Forward rotation at a specific speed: PWM % |
| 1 | PWM | L | PWM |
Reverse rotation at the specified speed: PWM % |
| X | 0 | L | L | Braking (outputs connected to ground) |
Power supply
By default, the motor supply voltage is separated from the Arduino supply. Common are the voltage of the logical part 5 V and the ground. The circuit can also be powered from Arduino VIN pin, for this purpose AVIN VOUT jumper must be inserted. In this mode, the supply voltage range depends on the Arduino board used, e.g. for Arduino Uno the values are from 7V to 12V.
Two-channel motor controller specification
- Supply voltage: 6 V to 32 V
- Supply voltages of the logical part: from 2.5 V to 5.5 V
- Continuous output current per channel: 0.65 A
- Maximum instantaneous current per channel: 0.9 A
- Protection against incorrect power supply
- Protection against too high a temperature
- The device can withstand voltages up to 40 V, at 34 V the protection is activated.
- Works with ArduinoUno, Leonardo, Mega2560 and Due
- Arduino library for easy handling
- Dimensions: 51 x 14.5 mm
- Weight: 2.5 g (without connectors)
The set includes: module, screw connectors, goldpin strip for self-soldering.
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