Short Circuits

DIGITISER

shift some digits

Learn About:

The DIGITISER is a versatile display and input board. Can be used as a number display for a clock, stopwatch, or count down timer (With the RTC on board the MOTHERBOARD), temperature, relative humidity, light and sound meter (Using the SENSOR ARRAY), or a simple score counter for your favourite card games. The DIGITISER uses 2 HC595 Shift Registers to drive 4 common anode 7-segment displays. PNP transistors are used to source current from the main supply while only requiring a small amount from the Shift Registers to switch them. With the 4 spare Shift Register outputs, we decided to add 4 coloured LEDs to act as mode indicators or whatever else you can come up with. 2 Switches and a potentiometer add some input options for what is likely to be front and center for a lot of builds. As with any of our kits, this one comes with an extensive manual.

Learn about:

  • Shift Registers (to minimise Microcontroller pin usage) 
  • Current Limiting Resistors
  • Multiplexing LEDs
  • PNP Transistors
  • Bit-Masking to change specific bits sent to a Shift Register
  • Switch inputs and debouncing
  • Using a Potentiometer with Analog Inputs
  • How to troubleshoot components in this kitCan ne
 
 

Required
Tools:

  • Powered through Terminal Blocks 
  • All Through-Hole Components
  • Through-Hole Test Points at key points in the circuit
  • Designed to be easy to follow and understand
  • 4 x 7-Segment Displays (Common Anode)
  • 2 x 74HC595 Shift Registers for Serial in, Parallel out
  • PNP Transistors to source current for the common anodes
  • Bypass Capacitors on each Shift Register to filter out interference
  • 4 different coloured LEDs for mode indicator, ambient volume indicator (Using the microphone on the SENSOR ARRAY) etc.
  • 2 Switches for mode select, incrementing numbers etc. 
  • 1 Potentiometer to change displayed value, or as a mode select, dimmer etc.
  • Multiple IO ports for neater wiring to other boards
  • Output Enable pin will be available for PWM dimming
  • 40+ page manual with every part of the circuit and every component explained in an easy to follow way
  • Height and Width: 100mm x 100mm
  • Stacks/Panels with other Short Circuit Boards
  • Clearly printed traces to aid understanding of the circuit and to help with fault finding
  • Back of board is printed with the circuit so you can see every trace, even when the components are soldered on. This makes it easier to understand and to fault find
 
 

Learn
About:

Manual

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Quick Reference

  • DIGITISER
  • 74HC595
  • 7 Segment Display
DIGITISER Specs: 
 
  • Overcurrent protection (Vin) 500mA (via MOTHERBOARD Vout)
  • Overvoltage Protection 5.1V (via MOTHERBOARD Vout)
  • 2 x 74HC595 Shift Registers to lower Microcontroller pin use
  • 3-Wire basic communication with the MOTHERBOARD (4 with Output Enable)
  • Chainable with other 595 boards from Short Circuits (RGB MATRIX etc.)
  • Utilises Column Scanning to display numbers
  • Only 12 of 16 Shift Register Outputs are used by the 7 Segment displays, so 4 extra coloured LEDs are included to utilise the extra 4
  • Output Enable pin is accessible, making PWM dimming possible
  • 4 x 7 Segment Displays (Common Anode)
  • 4 x PNP Transistors as switches 
  • 4 x Coloured LEDs 
  • 2 x Switches that support caps
  • 1 x Potentiometer for analog input
  • Multiple Data and Power IO
  • 100mm x 100mm x 1.6mm
  • 2 layer board
  • Gold coated contacts (ENIG)
DIGITISER Specs: 
 
  • Overcurrent protection (Vin) 500mA (via MOTHERBOARD Vout)
  • Overvoltage Protection 5.1V (via MOTHERBOARD Vout)
  • 2 x 74HC595 Shift Registers to lower Microcontroller pin use
  • 3-Wire basic communication with the MOTHERBOARD (4 with Output Enable)
  • Chainable with other 595 boards from Short Circuits (RGB MATRIX etc.)
  • Utilises Column Scanning to display numbers
  • Only 12 of 16 Shift Register Outputs are used by the 7 Segment displays, so 4 extra coloured LEDs are included to utilise the extra 4
  • Output Enable pin is accessible, making PWM dimming possible
  • 4 x 7 Segment Displays (Common Anode)
  • 4 x PNP Transistors as switches 
  • 4 x Coloured LEDs 
  • 2 x Switches that support caps
  • 1 x Potentiometer for analog input
  • Multiple Data and Power IO
  • 100mm x 100mm x 1.6mm
  • 2 layer board
  • Gold coated contacts (ENIG)
74HC595 Specs:                                                              
 
  • 3-5 Wire Serial Communication
  • Chainable with other 595 ICs
  • 8-Bit Serial-In, Parallel-Out Shifting
  • Wide Operating Voltage of 2V to 6V
  • Output Enable pin is accessible, making PWM dimming possible
  • Low Power Consumption: 80µA (Max)
  • Direct Clear and Output Enable
  • Max Continuous Current through VCC or GND: 70mA

DATASHEET

74HC595 Specs:                                                      
  • 3-5 Wire Serial Communication
  • Chainable with other 595 ICs
  • 8-Bit Serial-In, Parallel-Out Shifting
  • Wide Operating Voltage of 2V to 6V
  • Output Enable pin is accessible, making PWM dimming possible
  • Low Power Consumption: 80µA (Max)
  • Direct Clear and Output Enable
  • Max Continuous Current through VCC or GND: 70mA

DATASHEET

7 Segment Display (Common Anode) Specs:                                                              
 
  • 7 Segments + DP (Decimal Point) 
  • Common Anode
  • Continuous Forward Current per Segment: 20mA
  • Peak Forward Current per Segment: 60mA
  • Forward Voltage at 20mA: 2V Typical (3V Max) (Red)
  • 12.7mm x 19mm

DATASHEET

 
 
7 Segment Display (Common Anode) Specs:    

  • 7 Segments + DP (Decimal Point) 
  • Common Anode
  • Continuous Forward Current per Segment: 20mA
  • Peak Forward Current per Segment: 60mA
  • Forward Voltage at 20mA: 2V Typical (3V Max) (Red)
  • 12.7mm x 19mm

DATASHEET

 
 
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