first commit BLE heart rate trainer code

Author: jedgarpark

BLE_Heart_Rate_Trainer/ble_heart_rate_trainer.py

@@ -0,0 +1,167 @@
+"""
+Heart Rate Trainer
+Read heart rate data from a heart rate peripheral using the standard BLE
+Heart Rate service.
+Displays BPM value to Seven Segment FeatherWing
+Displays percentage of max heart rate on another 7Seg FeatherWing
+"""
+
+import time
+import board
+
+import adafruit_ble
+from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
+from adafruit_ble.services.standard.device_info import DeviceInfoService
+from adafruit_ble_heart_rate import HeartRateService
+
+from adafruit_ht16k33.segments import Seg7x4
+
+from digitalio import DigitalInOut, Direction
+
+# Feather on-board status LEDs setup
+red_led = DigitalInOut(board.RED_LED)
+red_led.direction = Direction.OUTPUT
+red_led.value = True
+
+blue_led = DigitalInOut(board.BLUE_LED)
+blue_led.direction = Direction.OUTPUT
+blue_led.value = False
+
+# target heart rate for interval training
+# Change this number depending on your max heart rate, usually figured
+# as (220 - your age).
+max_rate = 180
+
+# Seven Segment FeatherWing setup
+i2c = board.I2C()
+display_A = Seg7x4(i2c, address=0x70)  # this will be the BPM display
+display_A.brightness = 15
+display_A.fill(0)  # Clear the display
+# Second display has A0 address jumpered
+display_B = Seg7x4(i2c, address=0x71)  # this will be the % target display
+display_B.brightness = 15
+display_B.fill(0)  # Clear the display
+
+# display_A "b.P.M."
+display_A.set_digit_raw(0, 0b11111100)
+display_A.set_digit_raw(1, 0b11110011)
+display_A.set_digit_raw(2, 0b00110011)
+display_A.set_digit_raw(3, 0b10100111)
+# display_B "Prct"
+display_B.set_digit_raw(0, 0b01110011)
+display_B.set_digit_raw(1, 0b01010000)
+display_B.set_digit_raw(2, 0b01011000)
+display_B.set_digit_raw(3, 0b01000110)
+time.sleep(3)
+
+# display_A "...."
+display_A.fill(0)
+for h in range(4):
+    display_A.set_digit_raw(h, 0b10000000)
+# display_B show maximum heart rate value
+display_B.fill(0)
+display_B.print(max_rate)
+time.sleep(2)
+
+# PyLint can't find BLERadio for some reason so special case it here.
+ble = adafruit_ble.BLERadio()    # pylint: disable=no-member
+
+hr_connection = None
+
+def display_SCAN():
+    display_A.fill(0)
+    display_A.set_digit_raw(0, 0b01101101)
+    display_A.set_digit_raw(1, 0b00111001)
+    display_A.set_digit_raw(2, 0b01110111)
+    display_A.set_digit_raw(3, 0b00110111)
+
+
+def display_bLE():
+    display_B.fill(0)
+    display_B.set_digit_raw(0, 0b00000000)
+    display_B.set_digit_raw(1, 0b01111100)
+    display_B.set_digit_raw(2, 0b00111000)
+    display_B.set_digit_raw(3, 0b01111001)
+
+# Start with a fresh connection.
+if ble.connected:
+    display_SCAN()
+    display_bLE()
+    time.sleep(1)
+
+    for connection in ble.connections:
+        if HeartRateService in connection:
+            connection.disconnect()
+        break
+
+while True:
+    print("Scanning...")
+    red_led.value = True
+    blue_led.value = False
+    display_SCAN()
+    display_bLE()
+    time.sleep(1)
+
+
+    for adv in ble.start_scan(ProvideServicesAdvertisement, timeout=5):
+        if HeartRateService in adv.services:
+            print("found a HeartRateService advertisement")
+            hr_connection = ble.connect(adv)
+            # "...."
+            for j in range(4):
+                display_A.set_digit_raw(j, 0b10000000)
+                display_B.set_digit_raw(j, 0b10000000)
+
+            #display_B.fill(0)
+            time.sleep(2)
+            print("Connected")
+            blue_led.value = True
+            red_led.value = False
+            break
+
+    # Stop scanning whether or not we are connected.
+    ble.stop_scan()
+    print("Stopped scan")
+    red_led.value = False
+    blue_led.value = True
+    time.sleep(0.5)
+
+    if hr_connection and hr_connection.connected:
+        print("Fetch connection")
+        if DeviceInfoService in hr_connection:
+            dis = hr_connection[DeviceInfoService]
+            try:
+                manufacturer = dis.manufacturer
+            except AttributeError:
+                manufacturer = "(Manufacturer Not specified)"
+            try:
+                model_number = dis.model_number
+            except AttributeError:
+                model_number = "(Model number not specified)"
+            print("Device:", manufacturer, model_number)
+        else:
+            print("No device information")
+        hr_service = hr_connection[HeartRateService]
+        print("Location:", hr_service.location)
+
+        while hr_connection.connected:
+            values = hr_service.measurement_values
+            print(values)  # returns the full heart_rate data set
+            if values:
+                bpm = (values.heart_rate)
+                if bpm is not 0:
+                    pct_target = (round(100*(bpm/max_rate)))
+                display_A.fill(0)  # clear the display
+                display_B.fill(0)
+                if values.heart_rate is 0:
+                    for k in range(4):
+                        display_A.set_digit_raw(k, 0b01000000)
+                        display_B.set_digit_raw(k, 0b01000000)
+                else:
+                    display_A.fill(0)
+                    display_B.print(pct_target)
+                    time.sleep(0.1)
+                    display_A.print(bpm)
+
+            time.sleep(0.9)
+            display_A.set_digit_raw(0, 0b00000000)