The ShiftRegister class constructs an object that represents a shift register.
Parameters
pins An array of pins in
data, clock, latch, [reset]orderoptions 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 trueorfalse. Initialize shift register to output for common anode device.falseNo
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]);
Common Anode
new five.ShiftRegister({
isAnode: true,
pins: {
data: 2,
clock: 3,
latch: 4
}
});
new five.ShiftRegister({
isAnode: true,
pins: [2, 3, 4]
});
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.
