Difficulty implementing with a buzzer

[rendhelrico]

I am trying to implement this with a buzzer and raspberry pi 3. That the condition is when the heart rate is below 60 it will alarm the buzzer but I am getting this error

typeerror:unorderable types:nonetype() < int()

i am using a code similarly to yours so I hope you could help me. Im new this sorry for my ignorance

here is the code

`#!/usr/bin/env python2
import struct
import time
import sys
import argparse
from Crypto.Cipher import AES
from bluepy.btle import Peripheral, DefaultDelegate, ADDR_TYPE_RANDOM
from gpiozero import Buzzer
from time import sleep
buzzer = Buzzer (17)
''' TODO
Key should be generated and stored during init
'''

UUID_SVC_MIBAND2 = "0000fee100001000800000805f9b34fb"
UUID_CHAR_AUTH = "00000009-0000-3512-2118-0009af100700"
UUID_SVC_ALERT = "0000180200001000800000805f9b34fb"
UUID_CHAR_ALERT = "00002a0600001000800000805f9b34fb"
UUID_SVC_HEART_RATE = "0000180d00001000800000805f9b34fb"
UUID_CHAR_HRM_MEASURE = "00002a3700001000800000805f9b34fb"
UUID_CHAR_HRM_CONTROL = "00002a3900001000800000805f9b34fb"

HRM_COMMAND = 0x15
HRM_MODE_SLEEP = 0x00
HRM_MODE_CONTINUOUS = 0x01
HRM_MODE_ONE_SHOT = 0x02

CCCD_UUID = 0x2902

class MiBand2(Peripheral):
_KEY = b'\x30\x31\x32\x33\x34\x35\x36\x37\x38\x39\x40\x41\x42\x43\x44\x45'
_send_key_cmd = struct.pack('<18s', b'\x01\x08' + _KEY)
_send_rnd_cmd = struct.pack('<2s', b'\x02\x08')
_send_enc_key = struct.pack('<2s', b'\x03\x08')

def __init__(self, addr):
    Peripheral.__init__(self, addr, addrType=ADDR_TYPE_RANDOM)
    print("Connected")

    svc = self.getServiceByUUID(UUID_SVC_MIBAND2)
    self.char_auth = svc.getCharacteristics(UUID_CHAR_AUTH)[0]
    self.cccd_auth = self.char_auth.getDescriptors(forUUID=CCCD_UUID)[0]

    svc = self.getServiceByUUID(UUID_SVC_ALERT)
    self.char_alert = svc.getCharacteristics(UUID_CHAR_ALERT)[0]

    svc = self.getServiceByUUID(UUID_SVC_HEART_RATE)
    self.char_hrm_ctrl = svc.getCharacteristics(UUID_CHAR_HRM_CONTROL)[0]
    self.char_hrm = svc.getCharacteristics(UUID_CHAR_HRM_MEASURE)[0]
    self.cccd_hrm = self.char_hrm.getDescriptors(forUUID=CCCD_UUID)[0]

    self.timeout = 5.0
    self.state = None
    # Enable auth service notifications on startup
    self.auth_notif(True)
    self.waitForNotifications(0.1) # Let Mi Band to settle

def init_after_auth(self):
    self.cccd_hrm.write(b"\x01\x00", True)

def encrypt(self, message):
    aes = AES.new(self._KEY, AES.MODE_ECB)
    return aes.encrypt(message)

def auth_notif(self, status):
    if status:
        print("Enabling Auth Service notifications status...")
        self.cccd_auth.write(b"\x01\x00", True)
    elif not status:
        print("Disabling Auth Service notifications status...")
        self.cccd_auth.write(b"\x00\x00", True)
    else:
        print("Something went wrong while changing the Auth Service notifications status...")

def send_key(self):
    print("Sending Key...")
    self.char_auth.write(self._send_key_cmd)
    self.waitForNotifications(self.timeout)

def req_rdn(self):
    print("Requesting random number...")
    self.char_auth.write(self._send_rnd_cmd)
    self.waitForNotifications(self.timeout)

def send_enc_rdn(self, data):
    print("Sending encrypted random number")
    cmd = self._send_enc_key + self.encrypt(data)
    send_cmd = struct.pack('<18s', cmd)
    self.char_auth.write(send_cmd)
    self.waitForNotifications(self.timeout)

def initialize(self):
    self.setDelegate(AuthenticationDelegate(self))
    self.send_key()

    while True:
        self.waitForNotifications(0.1)
        if self.state == "AUTHENTICATED":
            return True
        elif self.state:
            return False

def authenticate(self):
    self.setDelegate(AuthenticationDelegate(self))
    self.req_rdn()

    while True:
        self.waitForNotifications(0.1)
        if self.state == "AUTHENTICATED":
            return True
        elif self.state:
            return False

def hrmStartContinuous(self):
    self.char_hrm_ctrl.write(b'\x15\x01\x01', True)
    

def hrmStopContinuous(self):
    self.char_hrm_ctrl.write(b'\x15\x01\x00', True)
    return

class AuthenticationDelegate(DefaultDelegate):

"""This Class inherits DefaultDelegate to handle the authentication process."""
def __init__(self, device):
    DefaultDelegate.__init__(self)
    self.device = device

def handleNotification(self, hnd, data):
    # Debug purposes
    #print("HANDLE: " + str(hex(hnd)))
    #print("DATA: " + str(data.encode("hex")))
    if hnd == self.device.char_auth.getHandle():
        if data[:3] == b'\x10\x01\x01':
            self.device.req_rdn()
        elif data[:3] == b'\x10\x01\x04':
            self.device.state = "ERROR: Key Sending failed"
        elif data[:3] == b'\x10\x02\x01':
            random_nr = data[3:]
            self.device.send_enc_rdn(random_nr)
        elif data[:3] == b'\x10\x02\x04':
            self.device.state = "ERROR: Something wrong when requesting the random number..."
        elif data[:3] == b'\x10\x03\x01':
            print("Authenticated!")
            self.device.state = "AUTHENTICATED"
        elif data[:3] == b'\x10\x03\x04':
            print("Encryption Key Auth Fail, sending new key...")
            self.device.send_key()
        else:
            self.device.state = "ERROR: Auth failed"
        #print("Auth Response: " + str(data.encode("hex")))
    elif hnd == self.device.char_hrm.getHandle():
        rate = struct.unpack('bb', data)[1]
        print("Heart Rate: " + str(rate))
    else:
        print("Unhandled Response " + hex(hnd) + ": " + str(data.encode("hex")))

def main():
""" main func """
parser = argparse.ArgumentParser()
parser.add_argument('host', action='store', help='MAC of BT device')
parser.add_argument('-t', action='store', type=float, default=3.0,
help='duration of each notification')

parser.add_argument('--init', action='store_true', default=False)
parser.add_argument('-n', '--notify', action='store_true', default=False)
parser.add_argument('-hrm', '--heart', action='store_true', default=False)
arg = parser.parse_args(sys.argv[1:])

print('Connecting to ' + arg.host)
band = MiBand2(arg.host)
band.setSecurityLevel(level="medium")

if arg.init:
    if band.initialize():
        print("Init OK")
    band.disconnect()
    return
else:
    band.authenticate()

band.init_after_auth()

if arg.notify:
    print("Sending message notification...")
    band.char_alert.write(b'\x01')
    time.sleep(arg.t)
    print("Sending phone notification...")
    band.char_alert.write(b'\x02')
    time.sleep(arg.t)
    print("Turning off notifications...")
    band.char_alert.write(b'\x00')

while True:
   
    band.hrmStopContinuous()
    band.hrmStartContinuous()
    for i in range(10):
        band.waitForNotifications(1.0)
    if band.hrmStopContinuous()<80:
        buzzer.on()
    else:
        buzzer.off()
       

print("Disconnecting...")
band.disconnect()
del band

if name == "main":
main()

`