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Product description: DRV8835- dual channel 11V/1.2A motor controller - Raspberry Pi overlay.
The module based on the DRV8835 allows you to control motors with supply voltages up to 11 V and continuous current consumption up to 1.2 A. The controller can also withstand current peaks of up to 1.5 A for several seconds. The speed can be controlled with aPWMsignal.
In combination withthe Raspberry Pi, the speed and direction of rotation of two DC motors can be easily controlled using a specially preparedlibrary. The shape and the leads of the board allow for a direct connection to the minicomputer, as shown in the figures above. The system uses GPIO 5, 6, 12 and 13 pins.
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Raspberry compatible product Pi B+ The manufacturer providesa Python library for Raspberry Pi users. |
Modes of operation
The engine power supply has been separated from the RaspberryPi B+.Voltage from 2 V to 11 V must be connected to the VIN and GND outputs. The power supply for the 3.3 V logical part is taken from the minicomputer.
The controller can work in two modes: basic PHASE/ENABLE and advanced IN/IN. The selection is made by means of MODE output, which is pulled up to VCC by default. The differences between the modes are shown in the tables below.
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Table for PHASE/ENABLE MODE=1 (default) |
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| xPHASE | xENABLE | MxA | MxB | Mode of operation |
| 1 | PWM | L | PWM |
Reverse rotation at the specified speed: PWM % |
| 0 | PWM | PWM | L |
Forward rotation at a specific speed: PWM % |
| X | 0 | L | L | Braking (outputs connected to ground) |
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Table for IN/IN MODE=0 |
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| xIN1 | xIN2 | MxA | MxB | Mode of operation |
| 0 | 0 | OPEN | OPEN | Outputs off. |
| 0 | PWM | L | PWM |
Reverse rotation at the specified speed: PWM % |
| PWM | 0 | PWM | L |
Forward rotation at a specific speed: PWM % |
| PWM | 1 | L | PWM |
Reverse rotation at the specified speed: 100% - PWM % |
| 1 | PWM | PWM | L |
Forward rotation at a specific speed: 100% - PWM % |
| 1 | L | L | L | Braking (outputs connected to ground) |
The device allows powering the mini-computer itself from the module input voltage (VIN). In order to stabilize the voltage to the required5 Vrequired by RaspberryPi, theS7V7F5 invertercan be solderedintospecially prepared 5 V (output voltage) GND (GND) VOUT (motor supply voltage) holes.
Two-channel motor controller specification
- Supply voltage: 2 V to 11 V
- Supply voltages of the logical part: from 2 V to 7 V
- Continuous output current per channel: 1.2 A
- Continuous output current at channel connection: 2,4 A
- Maximum instantaneous current per channel: 1.5 A
- Maximum instantaneous current when connecting channels: 3,0 A
- PWM frequency: up to 250 kHz
- Protection against incorrect power supply
- Dedicated toRaspberry Pi B+connectors
- Python libraryfor easy module operation
- Dimensions: 51 x 14.5 mm
- Weight: 2.5 g (without connectors)
The set includes: module, screw connectors, goldpin strip for self-soldering.
Useful links |
