Demand Peripherals     Robotics and Automation Made Easy

dpserver: Dpdaemon is the user-space daemon that converts ASCII strings on a TCP connection into the low level packets that read and write registers in the FPGA. You can get, install, and test dpdaemon with the following commands:

        git clone
        cd dpdaemon
        sudo make install
        # connect Baseboard to your PC
        sudo chmod 666 /dev/ttyUSB0
        stty -F /dev/ttyUSB0 raw     # no CR-to-CRLF translation
        cat DPCore.bin > /dev/ttyUSB0  # green LED turns on
        # start dpdaemon and test Baseboard LEDs
        dpdaemon -ef &               # -ef so we see error messages
        /usr/local/bin/dpset bb4io leds 55


DPI Schematics: Eagle schematics for most Demand Peripherals interface cards are released under a Creative Commons license. You can use the schematics for both personal and commercial applications but you need to keep the copyright and license information with any schematics that are derived from these schematics. Note that some circuits are patent protected.

A commercial license for the FPGA image includes the right to use the schematics and not release the results under Creative Commons.


FPGA Defined Peripherals
User Interface
FPGA Configuration
FPGA Buttons & LEDs
AVR Interface
Stereo Audio Amplifier
Text LCD and Keypad
Quad WS2812 Interface
Quad Slide Pot
IR Recv/Xmit
6 Digit LCD
RC Decoder
Keyfob RF Decoder
Rotary Encoder Interface
Quad Touch 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
Real Time Clock

Interface Cards
Control Cards
User Interface
Stereo Audio Amplifier
IR Recv/xmit
Six Digit LCD Display
Keyfob RF Receiver
Rotary Encoder
Quad Switch Card
Text LCD / keypad
Quad Slide Pot
Quad Touch Interface
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
I2C Prototyping
SPI Prototyping
USB 2.0 Hub
Real Time Clock
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
WW4 Large Prototyping Card
WW2 Prototyping Card
WW1 Small Prototyping Card
SMP SMD Prototyping Card