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.gitignore

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+our-proximibeat.js

README.md

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

proximibeat.js

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