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CPB_Ornament_Proximity/cpb_ornament_proximity.py

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+"""
+Circuit Playground Bluefruit Ornament Proximity
+This demo uses advertising to set the color of scanning devices depending on the strongest broadcast
+signal received. Circuit Playgrounds can be switched between advertising and scanning using the
+slide switch. The buttons change the color when advertising.
+"""
+
+import time
+from adafruit_circuitplayground.bluefruit import cpb
+
+from adafruit_ble import BLERadio
+from adafruit_ble.advertising.adafruit import AdafruitColor
+
+# The color pickers will cycle through this list with buttons A and B.
+color_options = [0x110000,
+                 0x111100,
+                 0x001100,
+                 0x001111,
+                 0x000011,
+                 0x110011,
+                 0x111111,
+                 0x221111,
+                 0x112211,
+                 0x111122]
+
+ble = BLERadio()
+
+i = 0
+advertisement = AdafruitColor()
+advertisement.color = color_options[i]
+cpb.pixels.auto_write = False
+cpb.pixels.fill(color_options[i])
+while True:
+    # The first mode is the color selector which broadcasts it's current color to other devices.
+    if cpb.switch:
+        print("Broadcasting color")
+        ble.start_advertising(advertisement)
+        while cpb.switch:
+            last_i = i
+            if cpb.button_a:
+                i += 1
+            if cpb.button_b:
+                i -= 1
+            i %= len(color_options)
+            if last_i != i:
+                color = color_options[i]
+                cpb.pixels.fill(color)
+                cpb.pixels.show()
+                print("New color {:06x}".format(color))
+                advertisement.color = color
+                ble.stop_advertising()
+                ble.start_advertising(advertisement)
+                time.sleep(0.5)
+        ble.stop_advertising()
+    # The second mode listens for color broadcasts and shows the color of the strongest signal.
+    else:
+        closest = None
+        closest_rssi = -80
+        closest_last_time = 0
+        print("Scanning for colors")
+        while not cpb.switch:
+            for entry in ble.start_scan(AdafruitColor, minimum_rssi=-100, timeout=1):
+                if cpb.switch:
+                    break
+                now = time.monotonic()
+                new = False
+                if entry.address == closest:
+                    pass
+                elif entry.rssi > closest_rssi or now - closest_last_time > 0.4:
+                    closest = entry.address
+                else:
+                    continue
+                closest_rssi = entry.rssi
+                closest_last_time = now
+                discrete_strength = min((100 + entry.rssi) // 5, 10)
+                cpb.pixels.fill(0x000000)
+                for i in range(0, discrete_strength):
+                    cpb.pixels[i] = entry.color
+                cpb.pixels.show()
+
+            # Clear the pixels if we haven't heard from anything recently.
+            now = time.monotonic()
+            if now - closest_last_time > 1:
+                cpb.pixels.fill(0x000000)
+                cpb.pixels.show()
+        ble.stop_scan()