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@andrewn

andrewn/espruino.js

Created Feb 14, 2021
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Corona Ampel-Status for Espruino and LEDs
var config = {
"ssid": "WIFI SSID",
"password": "WIFI PASSWORD",
"dataURL": "http://ampel-status.netlify.app/.netlify/functions/hello_fetch",
"timeoutMs": 60 * 1000,
"numLEDs": 3,
};
var errors = [];
var currentErrorIndex = 0;
var wifiState = null;
function logError(err) {
errors[currentErrorIndex++ % 10] = err;
}
var state = "init"
var existingTimeoutId = null;
var colours = {
"green": [ 25, 0, 0 ],
"yellow": [ 6, 29, 0 ],
"red": [ 0, 25, 0 ]
};
var statusNames = [
"basic_reproduction_number",
"incidence_new_infections",
"icu_occupancy_rate"
];
function testColours() {
updateLEDs(
[].concat(colours.green, colours.yellow, colours.green)
);
}
const OFF = [0, 0, 0];
const WHITE = [25, 25, 25];
const BLUE = [0, 0, 25];
const wifi = require('Wifi');
function connectToWifi() {
console.log('connectToWifi');
updateLEDs([].concat(BLUE, OFF, OFF));
state = "connectToWifi";
wifi.connect(config.ssid, {password: config.password}, function(e) {
console.log('... starting');
state = "startConnectToWifi";
if (e) {
console.log('error during connect:',e);
logError(e);
state = "connectToWifiError";
updateLEDs([].concat(OFF, OFF, BLUE));
wifi.disconnect();
connectToWifi();
} else {
console.log('connected to', config.ssid);
state = "connected";
updateLEDs([].concat(OFF, BLUE, BLUE));
wifi.stopAP();
//wifi.save();
fetchStatus();
}
});
}
require("Wifi").on('disconnected', connectToWifi);
function logWifi() {
require("Wifi").getDetails(console.log);
}
function parseIndicators(statuses) {
console.log('parseIndicators', statuses);
var updates = [];
statusNames.forEach(
name => {
updates = updates.concat(colours[statuses[name].color]);
}
);
return updates;
}
var rgb = new Uint8ClampedArray([0, 0, 0, 255, 255, 255, 0, 0, 0]);
function updateLEDs(updates) {
console.log('->', updates);
for (var i = 0, len = rgb.length; i < len; i++) {
rgb[i] = updates[i];
}
console.log('will write', rgb);
require("neopixel").write(D13, rgb);
}
function fetchStatus() {
console.log("Fetching", config.dataURL);
state = "fetchStatus";
var body = "";
require('http').get(config.dataURL, function(res) {
res.on('data', function(data) {
body += data;
});
res.on('error', function(e) {
logError(e);
});
res.on('close', function() {
console.log("Connection closed");
console.log("body", body);
var data = JSON.parse(body);
var updates = parseIndicators(data.indicators);
updateLEDs(updates);
if (existingTimeoutId) {
clearTimeout(existingTimeoutId);
}
existingTimeoutId = setTimeout(fetchStatus, config.timeoutMs);
});
});
}
function main() {
connectToWifi();
}
main();
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