Breadboard for "Shift Register - Seven segments, Chained"
Fritzing diagram: shift-register-daisy-chain.fzz
Run this example from the command line with:
node eg/shift-register-daisy-chain.js
const {Board, Button, ShiftRegister} = require("johnny-five");
const {eachSeries} = require("async");
const board = new Board();
board.on("ready", () => {
/**
* While we may have multiple ShiftRegisters,
* we only need one to control them both.
*/
const register = new ShiftRegister({
size: 2,
pins: {
data: 2,
clock: 3,
latch: 4,
reset: 9,
}
});
/**
* Pressing this button will trigger the die roll.
*/
const button = new Button(8);
/**
* Sends a random number to the shift register.
*/
function randomNumber() {
register.clear();
return register.display(Math.round(Math.random() * 20));
}
/**
* This is an array of delays in ms. When a button is pressed,
* we'll iterate over this array and display a random number after the
* delay. This simulates a die bouncing on a table.
*/
const delays = [
16, 16, 16, 16, 16, 16, 16, 16, 16, 16,
32, 32, 32, 32, 32, 32, 32, 32,
64, 64, 64, 64, 64, 64,
128, 128, 128, 128,
256, 256,
512,
];
register.reset();
register.clear();
button.on("press", () => {
console.log("Rolling...");
register.clear();
eachSeries(delays, (delay, done) => {
randomNumber();
setTimeout(() => {
register.clear();
done();
}, delay);
}, randomNumber);
});
});
