Adafruit DRV8871 Brushed DC Motor Driver Breakout Created by lady ada Last updated on 2018-08-22 03:54:40 PM UTC
Guide Contents Guide Contents Overview Pinouts Motor power pins Motor Input Pins Motor Output Assembly 2 3 7 7 8 8 10 Prepare the header strip and Add the breakout board: Solder! Usage Download Datasheets & Files Schematic Fabrication Print © Adafruit Industries 11 11 16 19 19 19 19 https://learn.adafruit.
Overview Crank up your robotics with powerful Adafruit DRV8871 motor driver breakout board. This motor driver has a lot of great specs that make it useful for a wide variety of mechatronics. In particular, the simple resistor-set current limiting and auto-magic PWM support make it super easy to use with almost any brushed DC motor. © Adafruit Industries https://learn.adafruit.
Check out the specs for the DRV8871: 6.5V to 45V motor power voltage Up to 5.5V logic level on IN pins 565mΩ Typical RDS(on) (high + low) 3.6A peak current PWM control Current limiting/regulation without an inline sense resistor Undervoltage lockout Overcurrent protection Thermal shutdown Using it is super simple. Connect your motor to the OUT terminal block. Power the board with 6.5-45VDC power on VMotor and provide the H-bridge input control on IN1 and IN2.
You can set the current limiting with an external resistor Rlim. We solder in a 30K resistor by default for a ~2A current limit, however you can remove this resistor and/or solder a resistor over it to change the resistance and change the limit. © Adafruit Industries https://learn.adafruit.
Each order comes with one fully assembled and tested motor driver breakout, two 2-pin terminal blocks and a small strip of header. Some light soldering is required to attach the header and terminal blocks but its a simple task that can be done with basic soldering equipment. © Adafruit Industries https://learn.adafruit.
Pinouts Motor power pins These two sets of pads are connected internally so you can use breadboard or terminal blocks to provide motor © Adafruit Industries https://learn.adafruit.
power. Use 6.5V-45VDC to power the motor and the chip. This isn't the same as the logic level of the chip, which is up to 5.5 VDC. You do not have to provide a logic level power supply to the chip, how nice is that? Motor Input Pins These are the inputs to the motor control. IN2 goes to OUT2, IN1 goes to IN1. Use up to 5.5V DC logic on these pins. You can PWM the inputs up to 200KHz, but lower frequencies will be more efficient. Motor Output © Adafruit Industries https://learn.adafruit.
Pretty simple - this is where your motor goes! Works with any DC brushed motor. Use thick wires to avoid dropping voltage across the wire resistance © Adafruit Industries https://learn.adafruit.
Assembly © Adafruit Industries https://learn.adafruit.
Prepare the header strip and Add the breakout board: Cut the strip to length if necessary. It will be easier to solder if you insert it into a breadboard - long pins down Place the breakout board over the pins so that the short pins poke through the breakout pads Solder! Be sure to solder all pins for reliable electrical contact. (For tips on soldering, be sure to check out our Guide to Excellent Soldering (https://adafru.it/aTk)). © Adafruit Industries https://learn.adafruit.
© Adafruit Industries https://learn.adafruit.
Next we will solder in the two 3.5mm terminal blocks used to connect power & the motor to the breakout board. Make sure the open parts of the terminals face outwards so you can easily connect wires To make it easier to keep these in place, you can use some tape to hold down the two header pieces. Tacky clay also works, whatever you've got handy! Solder in both pins of each terminal block. You can remove the tape when done. © Adafruit Industries https://learn.adafruit.
© Adafruit Industries https://learn.adafruit.
OK You're done! Now you can get your motors spinnin' ! © Adafruit Industries https://learn.adafruit.
Usage Using the motor driver is really easy. Wire up the two input pins to your microcontroller's PWM outputs. We'll be using an Arduino but any microcontroller or microcomputer can be used. If you don't have PWM outputs you can also just use straight logic high and low but you wont get speed control © Adafruit Industries https://learn.adafruit.
// Basic sketch for trying out the Adafruit DRV8871 Breakout #define MOTOR_IN1 9 #define MOTOR_IN2 10 void setup() { Serial.begin(9600); Serial.
© Adafruit Industries https://learn.adafruit.
Download Datasheets & Files DRV8871 Datasheet (https://adafru.it/oES) EagleCAD PCB Files on GitHub (https://adafru.it/oET) Fritzing object in our library (https://adafru.it/aP3) Schematic Fabrication Print Dimensions in Inches © Adafruit Industries https://learn.adafruit.
© Adafruit Industries Last Updated: 2018-08-22 03:54:34 PM UTC Page 20 of 20
