gomako · May 15, 2019 15:07 · May 15, 2019
diff --git a/espruino-iss-notifier.js b/espruino-iss-notifier.js
@@ -0,0 +1,130 @@
+
+// Wifi Credentials
+const WIFI_NAME = "YOURSSID";
+const WIFI_PASS = "YOURPASS";
+
+// Your location latitude and longitude
+const lat = 'YOURLAT';
+const lon = 'YOURLON';
+
+// Required libs
+const http = require("http");
+const np = require("neopixel");
+
+
+// Variable to store the time
+let now;
+// Variable to store ISS pass info
+let iss;
+// Variable to set the interval so we can clear it
+let intervalId;
+
+// Setup Wifi Shim according to instructions found here:
+// https://www.espruino.com/ESP8266
+digitalWrite(B9, 1); // enable on Pico Shim V2
+Serial2.setup(115200, { rx: A3, tx: A2 });
+
+// Turn LED off
+np.write(B5, [0,0,0]);
+
+/**
+ * Connect to WIFI
+ */
+var wifi = require("ESP8266WiFi_0v25").connect(Serial2, function (err) {
+  if (err) throw err;
+  console.log("Connecting to WiFi");
+
+  wifi.connect(WIFI_NAME, WIFI_PASS, err => {
+    if (err) throw err;
+    console.log("Connected");
+    // Once we have connected, set the UTC time
+    setTime();
+  });
+
+});
+
+/**
+ * Set the UTC time to sync with the ISS API
+ */
+function setTime() {
+  console.log("Setting Time");
+  http.get('http://worldclockapi.com/api/json/utc/now', res => {
+    let contents = '';
+    res.on("data", data => contents += data);
+    res.on("close", () => {
+      let timeJson = JSON.parse(contents);
+      now = new Date(timeJson.currentDateTime);
+      // Now we have set the time, let's get the ISS pass data
+      fetchData();
+    });
+  }).on("error", e => console.log("Error getting time: ", e));
+}
+
+/**
+ * Fetch the ISS Pass Data
+ */
+function fetchData() {
+  console.log("Fetching Data");
+
+  let url = `http://api.open-notify.org/iss-pass.json?lat=${lat}&lon=${lon}`;
+
+  http.get(url, res => {
+    let contents = '';
+    res.on("data", data => contents += data);
+    res.on("close", () => {
+      try {
+        iss = JSON.parse(contents);
+        // If we didn't have an error, all is good
+        if (iss.hasOwnProperty('message') && iss.message == 'success') {
+          // Calculate the interval between request time and next rise
+          let interval = (iss.response[0].risetime * 1000) - now.getTime();
+          let duration = iss.response[0].duration;
+          showDebug(iss);
+          // Set the timeout function (multiply the duration by 1k to convert to ms)
+          setTimeout(flashLED, interval, duration * 1000);
+        } else {
+          // Something went wrong, we'll try again in 30 seconds
+          setTimeout(fetchData, 30 * 1000);
+        }
+      } catch (e) {
+        // There was an error parsing the data, let's try again in 30 seconds
+        console.log("ERROR parsing ISS json", e);
+        setTimeout(fetchData, 30 * 1000);
+      }
+    });
+  }).on("error", (e) => {
+    // There was an error fetching the data, let's try again in 30 seconds
+    console.log("ERROR fetching data: ", e);
+    setTimeout(fetchData, 30 * 1000);
+  });
+}
+
+/** 
+ * Flash the LED to notify us of the 
+ */
+function flashLED(duration) {
+  console.log('ISS Overhead!');
+  let state = true;
+  intervalId = setInterval(() => {
+    if(state) np.write(B5, [100, 10, 10])
+    else np.write(B5, [10, 30, 100])
+    state = !state
+  }, 1000);
+  setTimeout(() => {
+    // Clear the interval
+    clearInterval(intervalId);
+    // Turn off LED
+    np.write(B5, [0,0,0]);
+    // Fetch more data!
+    setTime();
+  }, duration);
+}
+
+/**
+ * Show debug information in terminal
+ */
+function showDebug() {
+  console.log("Current time: ", now);
+  console.log("Next rise: ", new Date(iss.response[0].risetime * 1000));
+  console.log("Pass duration: ", iss.response[0].duration + " seconds. Or " + iss.response[0].duration / 60 + " minutes. ");
+}
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