基于树莓派的室内温度检测与烟雾火焰报警系统源码+数据库.zip

from flask import Flask,render_template,url_for import json,pymysql,datetime,decimal import Ds18b20 import RPi.GPIO as GPIO #设置GPIO为BCM编码 GPIO.setmode(GPIO.BCM) #RGB灯初始化设置 R,G,B = 18,15,14 GPIO.setup(R,GPIO.OUT) #设置端口为输出 GPIO.setup(G,GPIO.OUT) GPIO.setup(B,GPIO.OUT) pwmR = GPIO.PWM(R,0.2) #设置频率为0.2,即周期为5s pwmG = GPIO.PWM(G,0.2) pwmB = GPIO.PWM(B,0.2) pwmR.start(0) #设置占空比为0 pwmG.start(0) pwmB.start(0) #Buzzer蜂鸣器初始化设置 FMD = 26 GPIO.setup(FMD,GPIO.IN) #设置为输入，不响 #MQ2烟雾传感器初始化 MQ2 = 23 GPIO.setup(MQ2,GPIO.IN,pull_up_down=GPIO.PUD_DOWN) #设置上拉电阻 #火焰传感器初始化 FIRE = 24 GPIO.setup(FIRE,GPIO.IN,pull_up_down=GPIO.PUD_DOWN) app = Flask(__name__) @app.route('/') def hello_world(): return render_template('index.html') @app.route('/getData', methods=['POST']) def getData(): # 1.获取烟雾和火焰状态，并控制蜂鸣器状态 fire = GPIO.input(FIRE) mq2 = GPIO.input(MQ2) if fire == 0 or mq2 == 0: GPIO.setup(FMD, GPIO.OUT) GPIO.output(FMD, GPIO.LOW) else: GPIO.setup(FMD, GPIO.IN) # 2.读取温度，存到数据库中，然后进行RGB灯的控制 temp_c = Ds18b20.store_temp() color = 0 # 按钮显示 if temp_c > 30.0: # 红色 pwmR.ChangeDutyCycle(100) # 硬件RGB pwmG.ChangeDutyCycle(0) pwmB.ChangeDutyCycle(0) elif temp_c >= 28.0 and temp_c <= 30.0: # 黄色 pwmR.ChangeDutyCycle(100) pwmG.ChangeDutyCycle(100) pwmB.ChangeDutyCycle(0) color = 1 elif temp_c >= 23.0 and temp_c < 28.0: #绿色 pwmR.ChangeDutyCycle(0) pwmG.ChangeDutyCycle(100) pwmB.ChangeDutyCycle(0) color = 2 else: # 蓝色 pwmR.ChangeDutyCycle(0) pwmG.ChangeDutyCycle(0) pwmB.ChangeDutyCycle(100) color = 3 # 3.接着返回数据库的温度值，在浏览器中显示 connection = pymysql.connect(host='localhost',user='root',passwd='123456',db='sensordb') cur = connection.cursor() sql = 'SELECT * FROM temp' cur.execute(sql) result = cur.fetchall() v1 = [] v2 = [] for i in result: v1.append(i[0]) t = round(i[1], 2) v2.append(t) cur.close() j={} v3 = json.dumps(v1, cls=DateEncoder) v4 = json.dumps(v2, cls=DecimalEncoder) j['v1'] = v3 j['v2'] = v4 j['fire'] = fire j['mq2'] = mq2 j['color'] = color j = json.dumps(j) return j class DateEncoder(json.JSONEncoder): def default(self, obj): if isinstance(obj, datetime.datetime): return obj.strftime("%Y-%m-%d %H:%M:%S") else: return json.JSONEncoder.default(self, obj) class DecimalEncoder(json.JSONEncoder): def default(self, o): if isinstance(o, decimal.Decimal): return float(o) return super(DecimalEncoder, self).default(o) if __name__ == '__main__': app.run(host='0.0.0.0',debug=True)