ShiftRegister

Juan Eugenio Abadie edited this page Sep 18, 2016 · 16 revisions

The ShiftRegister class constructs an object that represents a shift register.

Parameters

  • pins An array of pins in data, clock, latch, [reset] order

  • options An object of constructor parameters

    Name Type Value/Description Default Required
    pins Object {data, clock, latch, [reset]} Yes (either)
    pins Array [data, clock, latch, [reset]] Yes (either)
    isAnode Boolean true or false. Initialize shift register to output for common anode device. false No

Shape

Property Name Description Read Only
id A user definable id value. Defaults to a generated uid No
pins the object containing the pin values for data, clock and latch No
value the object containing the pin values for data, clock and latch Yes
isAnode the object containing the pin values for data, clock and latch Yes

Component Initialization

Default

new five.ShiftRegister({
  pins: {
    data: 2,
    clock: 3,
    latch: 4
  }
});
new five.ShiftRegister({
  pins: [2, 3, 4]
});
new five.ShiftRegister([2, 3, 4]);

Shift Register Shift Register Seven Segment

Common Anode

new five.ShiftRegister({
  isAnode: true,
  pins: {
    data: 2,
    clock: 3,
    latch: 4
  }
});
new five.ShiftRegister({
  isAnode: true,
  pins: [2, 3, 4]
});

Shift Register Seven Segment Common Anode

Usage

var five = require("johnny-five");
var board = new five.Board();

board.on("ready", function() {
  var register = new five.ShiftRegister({
    isAnode: true,
    pins: {
      data: 2,
      clock: 3,
      latch: 4,
      reset: 9,
    }
  });
  var number = 0;
  var decimal = 0;

  register.reset();

  // Display numbers 0-9, one at a time in a loop.
  // Shows just the number for a half second, then
  // the number + a decimal point for a half second.
  setInterval(function() {
    register.display(number + (decimal && "."));

    if (decimal) {
      number++;
    }

    if (number > 9) {
      number = 0;
    }

    decimal ^= 1;
  }, 500);
});

API

  • clear() Clear the register.

  • display(number) Display a number on a seven segment display.

    // Display a 1 on a single seven segment controlled 
    // by the shift register.
    register.display(1);
  • display(string) Display a number on a seven segment display, optionally including the decimal point.

    // Display a 1 on a single seven segment controlled 
    // by the shift register. The decimal point will also be lit
    register.display("1.");
    
    // Display a 1 on a single seven segment controlled 
    // by the shift register. The decimal point will NOT be lit
    register.display("1");
  • reset() Reset the register.

  • send(B) Send an 8-bit byte value to the shift register.

  • send([B1, B2]) Send an array of 8-bit byte values to the shift register.

Events

ShiftRegister objects are output only and therefore do not emit any events.

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