Pololu 4038 DRV8256E Single Brushed DC Motor Driver Carrier
Pololu 4038 DRV8256E Single Brushed DC Motor Driver Carrier
Pololu 4038 DRV8256E Single Brushed DC Motor Driver Carrier
The Pololu 4038 is a compact motor driver carrier based on the Texas Instruments DRV8256E H-bridge IC, designed to drive single brushed DC motors with precise PWM speed control and bidirectional rotation capability. Roboticists, embedded systems engineers, and automation technicians use this carrier to integrate efficient motor control into microcontroller-based projects without designing complex driver circuits. This product solves the critical challenge of safely interfacing low-power microcontroller GPIO pins with higher-current DC motor loads while providing protection against back-EMF and short-circuit conditions.
Product Overview
The Pololu 4038 DRV8256E motor driver carrier utilizes the DRV8256E integrated circuit, a versatile single-channel H-bridge driver capable of delivering continuous currents up to 3.6A at 5V supply and peak currents up to 10A. The H-bridge topology allows independent control of motor direction through two logic-level inputs, while a third PWM input enables smooth speed modulation from 0 to 100 percent. The carrier board integrates essential protection circuitry including integrated gate drivers, shoot-through prevention logic, and inherent over-temperature shutdown, making it suitable for unattended autonomous applications where reliability is paramount.
This compact carrier measures just 0.5 by 0.7 inches and operates across a wide supply voltage range from 6.5V to 38V, making it compatible with single-cell lithium batteries, multiple alkaline cells, and regulated power supplies. The DRV8256E features internal current sense capability that can be externally monitored, low RDS(on) MOSFETs for minimal heat dissipation, and integrated freewheeling diodes for smooth motor braking. The through-hole pin configuration allows easy integration into breadboards or custom PCBs, while the small form factor makes it ideal for space-constrained robotics platforms and portable applications.
Key Specifications
| Specification | Details |
| Product Type | Single Channel Brushed DC Motor Driver Carrier |
| Brand | Pololu Robotics and Electronics |
| IC Model | Texas Instruments DRV8256E |
| Origin | Original Authentic |
| Warranty | 7 days on manufacturing defects |
| Shipping | 1-5 days from Bengaluru |
| Delivery | 7-8 days across India |
| Support | 24/7 via Email and WhatsApp |
| Supply Voltage Range | 6.5V to 38V |
| Continuous Current Rating | 3.6A at 5V supply |
| Peak Current Rating | 10A maximum |
| Control Inputs | 2 direction logic inputs, 1 PWM speed input |
| Board Dimensions | 0.5 inch by 0.7 inch |
| Pin Configuration | Through-hole for breadboard and PCB integration |
Key Features
- H-bridge topology enables independent bidirectional motor control with forward, reverse, and coast modes for precise motion management in robotic applications
- PWM speed control input accepts frequencies up to 250kHz, allowing smooth acceleration profiles and energy-efficient variable-speed operation
- Integrated current sensing capability with external monitoring option enables real-time motor load assessment and stall detection without additional sensors
- Wide supply voltage range from 6.5V to 38V accommodates diverse power source configurations from battery packs to industrial power supplies
- Over-temperature thermal shutdown protection automatically disables the driver when junction temperature exceeds 150 degrees Celsius, preventing permanent damage
- Low RDS(on) MOSFET gates minimize power dissipation and heat generation, extending operating time in battery-powered systems
- Integrated freewheeling diodes provide smooth braking and prevent voltage spikes that could damage connected microcontrollers
- Compact 0.5 by 0.7 inch form factor fits seamlessly into space-constrained robotics platforms and wearable electronics
Applications and Use Cases
- Mobile robotics platforms requiring independent motor speed control for differential drive locomotion with precise velocity matching between left and right wheels
- Autonomous line-following robots utilizing PWM signals from microcontroller comparators to maintain constant motor speed despite varying battery voltage
- Robotic arm joint actuators needing bidirectional rotation control with smooth acceleration to prevent mechanical shock and joint stress
- Conveyor belt systems in industrial automation requiring variable-speed control and soft-start capabilities to reduce mechanical wear
- Drone landing gear deployment mechanisms requiring controlled motor extension and retraction with stall detection for safety verification
- Educational robotics projects teaching embedded systems students the fundamentals of motor control, H-bridge operation, and PWM signal generation
- Hobbyist drone frame designs utilizing multiple DRV8256E carriers for multi-motor coordination in custom aerial platforms
- Automated greenhouse systems controlling fan motors and water pump actuators with temperature-based PWM modulation
How to Use
Begin by connecting the motor supply voltage to the VCC and GND pins of the Pololu 4038 carrier, ensuring polarity is correct as reverse voltage will damage the integrated circuit. Connect your brushed DC motor leads to the OUT1 and OUT2 pins, and verify motor rotation direction by observing the initial movement when you apply control signals. Connect the IN1 and IN2 logic-level inputs to your microcontroller GPIO pins configured as digital outputs, and connect the PWM input to a PWM-capable GPIO pin or timer output. Configure your microcontroller to generate PWM signals at frequencies between 1kHz and 250kHz for optimal performance, with duty cycles from 0 to 100 percent controlling motor speed.
Implement motor control logic by setting IN1 and IN2 to different logic levels for forward rotation, reverse rotation, or coast mode, while varying the PWM duty cycle on the PWM input pin to modulate speed smoothly. For applications requiring stall detection or current monitoring, connect an oscilloscope or ADC input to the SENSE pin to observe the voltage drop across the internal current-sensing resistor, which is proportional to motor load current. Always include a 100-microfarad capacitor across the supply voltage pins near the carrier board to filter voltage transients and prevent logic errors from motor back-EMF. Test your implementation with a low-voltage power supply first before connecting to higher voltage sources, and monitor the carrier temperature during extended operation to ensure thermal dissipation is adequate for your application current requirements.
Frequently Asked Questions
What is the maximum continuous current this motor driver can safely handle?
The Pololu 4038 DRV8256E is rated for continuous current delivery of 3.6A at 5V supply voltage. At higher supply voltages, the continuous current rating may be slightly lower due to increased power dissipation in the MOSFET gates. Peak current can reach 10A for brief periods, but sustained operation above 3.6A requires adequate heat dissipation through a heatsink or forced-air cooling. Always verify your motor's stall current specification is below the rated continuous current to prevent thermal shutdown during normal operation.
Can I use this driver with a 12V power supply for a standard DC motor?
Yes, the Pololu 4038 supports supply voltages from 6.5V to 38V, making it fully compatible with 12V power supplies commonly used in robotics. At 12V, the driver can deliver approximately 2.5A continuous current depending on thermal conditions. Ensure your motor is rated for 12V operation and that your microcontroller logic inputs are properly isolated if operating from different ground planes. Use a 100-microfarad capacitor across the supply pins to filter voltage transients and maintain stable logic signal levels.
How do I detect motor stall conditions using this driver?
The Pololu 4038 includes an internal current-sensing resistor connected to the SENSE pin, which outputs a voltage proportional to motor load current. When the motor stalls, current draw increases dramatically, producing a higher voltage on the SENSE pin. Connect the SENSE pin to an ADC input on your microcontroller and set a threshold voltage corresponding to your motor's stall current. When the sensed voltage exceeds this threshold for a defined time period, your firmware can trigger stall-handling routines such as reducing PWM duty cycle or reversing motor direction.
What PWM frequency should I use for optimal motor control?
The DRV8256E supports PWM frequencies from 1kHz to 250kHz. For most DC motor applications, frequencies between 10kHz and 20kHz provide excellent speed control smoothness while remaining inaudible to human hearing. Lower frequencies below 5kHz may cause audible motor coil whine and less precise speed regulation. Higher frequencies above 50kHz reduce EMI radiation and acoustic noise further but increase switching losses slightly. Choose your PWM frequency based on your microcontroller's timer capabilities and your application's noise sensitivity requirements.
When will I receive my order?
Orders are dispatched within 1-5 business days from our Bengaluru warehouse. Delivery takes 7-8 days to most locations across India.
What is your return and warranty policy?
We offer a 7-day return policy on manufacturing defects only. Contact support within 7 days of receipt for free replacement or full refund. Not applicable for user damage or misuse.
Are bulk discounts available?
Yes, wholesale pricing for orders of 10 or more units. Contact our sales team via WhatsApp or email for a customized bulk quote.
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- Returns: 7-day return policy on manufacturing defects only
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