Demand Peripherals     Robotics and Automation Made Easy

LCD6: Six Digit LCD Display

The LCD6 six digit LCD display card has six large, easy to read, 7-segment digits that are controlled by the LCD6 peripheral in the FPGA.


- Large, easy to read digits
- Hex display or segment control
- Uses the ESPI 7474 circuit for reliable operation
- User space Linux device driver (part of dpserver)
- Requires one slot on a Baseboard FPGA card



The LCD6 card drives the segments of the LCD using the putputs of a 749595 shift register. The clock to the shift registers uses the 7474 quadrature clock scheme from the ESPI card. Note that in the LCD6 card there are two data lines from FPGA and that one of the shift registers is clocked on the negative edge of the clock. Using two data lines and clocking on both edges lets the LCD shift registers fill in 8 clock cycles from the FPGA.

The schematic and layout of the LCD6 are shown below. The Eagle schematic and board files available here: lcd6.sch and lcd6.brd. The bill-of-materials is available here: lcd6.txt.



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
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
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
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
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