Demand Peripherals     Robotics and Automation Made Easy

D7HB: Dual 7 Amp H-Bridge Card

The electronics in the dual 7 amp H-Bridge card work with the logic in a Baseboard FPGA card to form either a dual DC motor controller or a bipolar stepper motor controller.


- 7 Amp continuous current
- 12 Amp peak current
- Up to 18 volt input
- High current FET drivers for high frequency PWM
- Modes include Forward, Reverse, Brake, and Coast


The schematic and layout of the D7HB are shown below. The Eagle schematic and board files are available here: d7hb.sch and d7hb.brd. The bill-of-materials is available here: d7hb.txt.



When used with the "dc2" peripheral this interface card can provide direction, PWM speed control, and both brake and coast for two motors. The card uses four pins from the FPGA, two pins for each motor. The outputs are labeled 1 and 2 on the card. The table below shows the translation of the inputs input pin values to modes.

INPUT    MODE         OUT1       OUT2
 00      Coast        low        low
 01      Forward      low        (PWM)
 10      Reverse      (PWM)      low
 11      Brake        high       high     The power-on default

When used with the polar stepper controller peripheral ("bstep") this interface card can provide direction, step rate, step count, and holding current for a bipolar stepper motor with a current rating of up to 7 amps and a voltage rating of up to 18 volts.

FPGA Defined Peripherals
User Interface
FPGA Configuration
FPGA Buttons & LEDs
Text LCD and Keypad
Quad WS2812 Interface
Quad Slide Pot
Tone Generator
IR Recv/Xmit
6 Digit LCD
RC Decoder
Keyfob RF Decoder
Rotary Encoder Interface
Motion Control
Dual DC Motor Controller
Dual Quadrature Decoder
Quad 13 Bit Servo
Bipolar Stepper Controller
Unipolar Stepper Controller
Simple Input / Output
Quad Binary Output
Quad Binary Input
Octal Input/Output
32 Channel Binary Output
32 Channel Binary Input
Octal 12-bit ADC
Quad Ping))) Interface
Octal SRF04 Interface
Quad Event Counter
Generic I2C
Generic SPI
Octal 8-Bit DAC
Quad Digital Potentiometer
Quad PWM Output
Quad PWM Input
4 Bit Pattern Generator
Real Time Clock
Dual Watchdog Timers

Interface Cards
User Interface
Audio Amplifier
IR Recv/xmit
Six Digit LCD Display
Keyfob RF Receiver
Rotary Encoder
Quad Switch Card
Text LCD / keypad
Quad Slide Pot
Motion Control
Dual 7-amp H-bridge
Quad Open Drain Driver
Quad 10 Amp Relay Card
Input / Output
Octal 8-Bit DAC
Quad Digital Potentiometer
Octal 12-bit ADC
Octal SRF04
Generic I2C
Generic SPI
USB 2.0 Hub
Real Time Clock
Slot Expander
Octal Input/Output
32 Channel Input
32 Channel Output
Power Distribution Card
15 Amp Power Distribution
5 Volt Switching Regulator
ATX Power Break-Out Card
Disk Drive Power Break-Out
MP43 Aluminum Mounting Plate
WW2 Prototyping Card
WW1 Small Prototyping Card