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      README.md
  3. 80
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      proximibeat.js

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.gitignore View File

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+our-proximibeat.js

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README.md View File

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+### Proximibeat
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+
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+Code that makes a couple of [puck.js](https://www.puck-js.com/) devices blink
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+the red LED in a heart-beat sequence if they sense each other on a BLE scan.
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+The blink rate increases the stronger the signal is (perfect as his/hers blings).
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+
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+![Neora and Nimrod demonstrate](https://zzzen.com/kraftz/2022-02-22%20-%20proximibeat.gif)
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+
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+Necklaces were designed by [Ortal Ben Dayan](https://www.ortalbendayan.com/).
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+
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+Button activates/deactivates scan and blink functionality (in order to save battery).
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+Even when deactivated it doesn't stop advertising BLE (and other device, if active,
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+can sense it). Note, however, that if you connect to a device (for example via the web IDE),
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+the other device won't sense it (this is a very common face-palm situation).
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+
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+As feedback, the device performs a few heart beat animations (regardless of whether or not
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+it senses the other device):
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+
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+* When activating, animation rate is slow.
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+* When deactivating, animation rate is fast.
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+
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+Initial state of the device (after uploading code) is inactive.
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+
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+You can do a `save()` from IDE in that state (no need for `onInit()` or such, because button would activate whatever needs activating).

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proximibeat.js View File

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+// === ENTER NRF.getAdress() results of the couple of
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+// === puck.js devices you want to identify each other
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+const his = "12:34:56:78:9a:bc", hers = "fe:dc:ba:98:76:54";
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+
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+let me = NRF.getAddress(), other = me===hers ? his : hers;
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+let other_id = `${other} random`;
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+
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+// heart-beat LED animation sequence
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+let seq = [1,1,0,1,1,0,0,0,0], seq_idx = 0;
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+let anim_interval_id = 0, main_interval_id = 0;
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+let active = false, grace_period = 0;
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+
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+function anim_step() { // a single heart-beat animation step
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+  digitalWrite(LED1, seq[seq_idx]);
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+  seq_idx = (seq_idx+1)%seq.length;
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+}
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+
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+// set interval (1/rate) of animation. 0 means stop animation
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+function animate(interval) {
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+  if (anim_interval_id) {
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+    clearInterval(anim_interval_id);
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+    digitalWrite(LED1, 0);
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+    anim_interval_id = 0;
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+  }
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+  if (interval) {
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+    anim_interval_id = setInterval(anim_step, interval);
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+  }
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+}
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+
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+let main_event;
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+main_event = function() {
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+  if (grace_period) {
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+    grace_period--;
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+    if (!grace_period) {
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+      if (active) {
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+        active = false;
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+        if (main_interval_id) {
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+          clearInterval(main_interval_id);
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+          main_interval_id = 0;
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+        }
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+        console.log("Deactivated");
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+      } else {
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+        active = true;
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+        console.log("Activated");
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+      }
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+      animate(0);
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+    }
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+    return;
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+  }
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+  NRF.requestDevice(
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+    {filters: [{id: other_id}]}
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+  ).then(
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+    function(device) {
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+      let rssi = device.rssi, interval = Math.max(30, 120-3*(rssi+80));
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+      console.log(rssi, interval);
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+      animate(interval);
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+    },
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+    function(e) {
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+      console.log(e);
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+      animate(0);
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+    }
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+  );
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+};
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+
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+// Button activates/deactivates
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+// Also animates for a grace period:
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+// Slow for activate, fast for deactivate
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+setWatch(function() {
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+  grace_period = 2;
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+  if (active) {
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+    console.log("Deactivating");
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+    animate(20);
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+  } else {
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+    console.log("Activating");
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+    animate(100);
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+    if (!main_interval_id) {
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+      main_interval_id = setInterval(main_event, 3000);
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+    }
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+  }
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+}, BTN, {edge:"rising", debounce:50, repeat:true});

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