上传代码

data.json

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+{
+    "time": "2021-10-24 00:43:56",
+    "node2": {
+        "humi": 44.9,
+        "temp": 25.2,
+        "light": 360.8
+    },
+    "node3": {
+        "humi": 43.2,
+        "temp": 26.8,
+        "light": 25.8
+    },
+    "node4": {
+        "humi": 43.4,
+        "temp": 26.6,
+        "light": 25.8
+    },
+    "node5": {
+        "humi": 44.5,
+        "temp": 25.6,
+        "light": 30.0
+    }
+}

main.py

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+import sys
+import time
+import json
+
+import serial
+import serial.tools.list_ports
+from PyQt5.QtWidgets import *
+from PyQt5.QtCore import *
+from PyQt5.QtGui import *
+
+
+class MainWidget(QWidget):
+    def __init__(self, parent=None):
+        super(MainWidget, self).__init__(parent)
+
+        self.setWindowTitle('Demo')
+
+        self.label_node2 = QLabel(
+            '节点：2    湿度：    %    温度：    °C    光照度：     lx    ')
+        self.label_node3 = QLabel(
+            '节点：3    湿度：    %    温度：    °C    光照度：     lx    ', self)
+        self.label_node4 = QLabel(
+            '节点：4    湿度：    %    温度：    °C    光照度：     lx    ', self)
+        self.label_node5 = QLabel(
+            '节点：5    湿度：    %    温度：    °C    光照度：     lx    ', self)
+
+        self.combobox = QComboBox()
+
+        self.port_list = serial.tools.list_ports.comports()
+        for port in self.port_list:
+            self.combobox.addItem(port.description)
+
+        self.btnStart = QPushButton('开始')
+        self.btnExit = QPushButton('退出')
+        self.btnScanPort = QPushButton('刷新串口')
+
+        # 实例化多线程对象
+        self.thread = Worker(self.port_list[0].name)
+
+        # 把控件放置在栅格布局中
+        layout = QGridLayout(self)
+        layout.addWidget(self.label_node2, 1, 1, 1, 4)
+        layout.addWidget(self.label_node3, 2, 1, 1, 4)
+        layout.addWidget(self.label_node4, 3, 1, 1, 4)
+        layout.addWidget(self.label_node5, 4, 1, 1, 4)
+        layout.addWidget(self.btnScanPort, 6, 1, 1, 1)
+        layout.addWidget(self.combobox, 6, 2, 1, 1)
+        layout.addWidget(self.btnStart, 6, 3, 1, 1)
+        layout.addWidget(self.btnExit, 6, 4, 1, 1)
+
+        # 信号与槽函数的连接
+        self.thread.sign_node.connect(self.slotUpdateNode)
+        self.combobox.currentIndexChanged.connect(self.slotSelectPort)
+        self.btnScanPort.clicked.connect(self.slotScanPort)
+        self.btnStart.clicked.connect(self.slotStart)
+        self.btnExit.clicked.connect(self.slotStop)
+
+    def slotScanPort(self):
+        self.port_list = serial.tools.list_ports.comports()
+        self.combobox.clear()
+        for port in self.port_list:
+            self.combobox.addItem(port.description)
+        self.thread.port_name = self.port_list[0].name
+
+    def slotSelectPort(self, index):
+        self.thread.port_name = self.port_list[index].name
+
+    def slotUpdateNode(self, node_seq, node_str):
+        # 更新
+        if (node_seq == 2):
+            self.label_node2.setText(node_str)
+        if (node_seq == 3):
+            self.label_node3.setText(node_str)
+        if (node_seq == 4):
+            self.label_node4.setText(node_str)
+        if (node_seq == 5):
+            self.label_node5.setText(node_str)
+
+    def slotStart(self):
+        self.combobox.setEnabled(False)
+        self.btnScanPort.setEnabled(False)
+        self.btnStart.setEnabled(False)
+        self.btnExit.setEnabled(True)
+        self.thread.start()
+
+    def slotStop(self):
+        self.btnExit.setEnabled(False)
+        del self.thread
+        sys.exit()
+
+
+class Worker(QThread):
+    sign_node = pyqtSignal(int, str)
+    port_name: str
+
+    def __init__(self, port_name, parent=None):
+        super(Worker, self).__init__(parent)
+        # 设置工作状态与初始num数值
+        self.port_name = port_name
+        self.working = True
+
+    def __del__(self):
+        # 线程状态改变与线程终止
+        self.working = False
+        self.wait()
+
+    def run(self):
+        last_str = ''
+
+        self.com = serial.Serial(self.port_name, 115200)
+
+        while self.working == True:
+
+            serial_str = self.com.readline().decode('utf-8')
+
+            if (serial_str.find('ata') != -1):
+                continue
+
+            str_list = serial_str.split('&')  # 分割字符串
+
+            if len(str_list) != 5:  # 数据缺失
+                print('数据缺失！')
+                continue
+
+            if (serial_str != last_str):  # 检测数据是否重复
+                last_str = serial_str
+
+                try:  # 转换数据
+                    seq: int = int(str_list[0])
+                    humi: float = round(float(str_list[1]), 1)
+                    temp: float = round(float(str_list[2]), 1)
+                    light: float = round(float(str_list[3]), 1)
+
+                except Exception:
+                    print('数据错误！')
+                    continue
+
+                print(f"节点：{seq}    湿度：{humi}%    温度：{temp}°C    光照度：{light}lx")
+
+                # 写入 json 文件
+                data = json.loads(
+                    open('./data.json', 'r', encoding='utf-8').read())
+
+                data['node' + str(seq)]['humi'] = humi
+                data['node' + str(seq)]['temp'] = temp
+                data['node' + str(seq)]['light'] = light
+                data['time'] = time.strftime(
+                    '%Y-%m-%d %H:%M:%S', time.localtime(time.time()))
+
+                with open('./data.json', 'w') as fp:
+                    fp.write(json.dumps(data))
+                    fp.close()
+
+                # 获取文本
+                node_str = f"节点：{seq}    湿度：{humi}%    温度：{temp}°C    光照度：{light}lx"
+                # 发射信号
+                self.sign_node.emit(seq, node_str)
+
+
+if __name__ == '__main__':
+    app = QApplication(sys.argv)
+    app.setStyleSheet("QLabel{font-size: 18pt;}")
+    demo = MainWidget()
+    demo.show()
+    sys.exit(app.exec_())