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0～100%RH、-40～125 deg，误差 2%RH、0.2 deg，重复性 0.08%RH、0.04 deg，飘移 0.25%RH/yr、0.03 deg/yr。 +- I2C 多路复用：[TCA9548A](https://oss.frank14f.online/EEE/16ch-temp-hum/tca9548a.pdf)，4x4mm QFN。1-8 双向转换开关，可设置为 8 个地址，可连接 64 个同名设备。 +- 数据传输：16 通道 1.1mm 三芯屏蔽线传输数据和供电，经复用开关汇于主控处理为物理量，通过 USB 串口输出。 + +
seeed-studio-xiao
+ +## PCB 设计 + +- 精简设计：周围元件种类仅 4 种：2.2k 主上拉电阻、10k 从上拉电阻、1uF 主解耦、100nF 从解耦。 +- 轻薄：传感器基板使用 0.11mm FPC ，总高度 1mm。 + +
PCBFPC
+ +## 主控程序 + +- 初始化：软重置所有通道的传感器。 +- 定时运行：每经过 1000 系统毫秒运行一次采样。 +- 单次拉取模式：发送请求至传感器后等待采样（15ms）回复 6 byte 数据。 +- CRC-8 校验：4 byte 数据通过 2 byte 校验确认传输完整性。 + +```c++ +// 16ch Temp&Hum by WANG Yanqi +// Created 4 Jan 2024 + +#include + +const long interval = 1000; +const uint8_t addr_hub[] = {0x70, 0x72}; +const uint8_t addr_sen = 0x44; +const int size_hub = sizeof(addr_hub)/sizeof(addr_hub[0]); +unsigned long previousMillis = 0; +unsigned long currentMillis = 0; +uint8_t data[6]; +uint8_t data_crc[2]; +float temp; +float hum; + +float fun_temp(float raw); +float fun_hum(float raw); +uint8_t crc8(const uint8_t* data, size_t length); + +void setup() { + Wire.begin(); + Serial.begin(9600); + delay(5000); + // Go through all the hubs + for (int i = 0; i < size_hub; i++) { + // Go through 8 ch. in a hub + for (uint8_t ch = 0b00000001; ch != 0; ch = ch << 1) { + // Open the ch. + Wire.beginTransmission(addr_hub[i]); + Wire.write(ch); + Wire.endTransmission(); + // Soft reset sen. + Wire.beginTransmission(addr_sen); + Wire.write(0x30); + Wire.write(0xA2); + Wire.endTransmission(); + delay(100); + } + // Close all the ch. + Wire.beginTransmission(addr_hub[i]); + Wire.write(0); + Wire.endTransmission(); + } +} + +void loop() { + // Get the current number of milliseconds since the program started + currentMillis = millis(); + if (currentMillis - previousMillis >= interval) { + // Go through all the hubs + for (int i = 0; i < size_hub; i++) { + // Go through 8 ch. in a hub + for (uint8_t ch = 0b00000001; ch != 0; ch = ch << 1) { + // Open the ch. + Wire.beginTransmission(addr_hub[i]); + Wire.write(ch); + Wire.endTransmission(); + read_sen(addr_sen, data); + // Check temp. + data_crc[0] = data[0]; + data_crc[1] = data[1]; + if (crc8(data_crc, sizeof(data_crc)) == data[2]) { + temp = fun_temp((data[0] << 8) | data[1]); + } else { + temp = NAN; + } + // Check hum. + data_crc[0] = data[3]; + data_crc[1] = data[4]; + if (crc8(data_crc, sizeof(data_crc)) == data[5]) { + hum = fun_hum((data[3] << 8) | data[4]); + } else { + hum = NAN; + } + // Print data + Serial.print(temp); + Serial.print(","); + Serial.print(hum); + if (i != size_hub-1 || ch != 0b10000000) { + Serial.print(";"); + } + } + // Close all the ch. + Wire.beginTransmission(addr_hub[i]); + Wire.write(0); + Wire.endTransmission(); + } + Serial.print("\n"); + previousMillis = currentMillis; + } +} + +void read_sen(uint8_t addr, uint8_t* data) { + // Clock stretching, high repeatability + Wire.beginTransmission(addr); + Wire.write(0x2C); + Wire.write(0x06); + Wire.endTransmission(); + Wire.requestFrom(addr, 6); + for (int i = 0; i < 6; i++) { + data[i] = Wire.read(); + } +} + +uint8_t crc8(const uint8_t* data, size_t length) { + // Start with 0xFF for initialization + uint8_t crc = 0xFF; + for (size_t i = 0; i < length; ++i) { + crc ^= data[i]; + // Loop over each bit + for (uint8_t j = 8; j; --j) { + // If the uppermost bit is 1... + if (crc & 0x80) { + // ... shift left and XOR with the polynomial + crc = (crc << 1) ^ 0x31; + } else { + // Otherwise, just shift left + crc <<= 1; + } + } + } + // No final XOR + return crc; +} + +float fun_temp(float raw) { + float temp = -45.0 + 175.0 * raw / 65535; + return temp; +} + +float fun_hum(float raw) { + float hum = 100.0 * raw / 65535; + return hum; +} +``` + +## 上位程序 + +- 创建图形界面：使用 matplotlib 的 pyplot、widgets 实时显示数据和按钮。 +- 读取数据：等待串口输出一行，记录主机时间戳，存入数组。 +- 存储数据：关闭窗口后，将所有数据以 CSV 格式保存。 + +```python +# pip install pyserial matplotlib pandas + +import serial +import matplotlib.pyplot as plt +import pandas as pd +from matplotlib.widgets import Button +from datetime import datetime + +max_points = 20 # Number of points to display on the graph +data = { + 'Timestamp': [], + **{f'Temp{i+1}': [] for i in range(16)}, + **{f'Hum{i+1}': [] for i in range(16)} +} + +# Initialize plots +plt.ion() +fig, (ax_temp, ax_hum) = plt.subplots(2, 1, figsize=(15, 10)) + +# Set plot titles and labels +ax_temp.set_title('Temperature') +ax_temp.set_xlabel('Time') +ax_temp.set_ylabel('Temperature (°C)') + +ax_hum.set_title('Humidity') +ax_hum.set_xlabel('Time') +ax_hum.set_ylabel('Humidity (%)') + +# Global flag to control the data collection +collecting_data = False +exit_flag = False + +# Button callback functions +def start_button_callback(event): + global collecting_data + collecting_data = True + +def exit_button_callback(event): + global exit_flag + exit_flag = True + +# Create the buttons +ax_start_button = plt.axes([0.7, 0.05, 0.1, 0.075]) +ax_exit_button = plt.axes([0.81, 0.05, 0.1, 0.075]) + +start_button = Button(ax_start_button, 'Start') +start_button.on_clicked(start_button_callback) + +exit_button = Button(ax_exit_button, 'Exit') +exit_button.on_clicked(exit_button_callback) + +# Display the plot window +plt.show(block=False) + +# Wait here until 'Start' button is pressed +while not collecting_data: + plt.pause(0.1) # Use a short pause to handle UI events + if exit_flag: + plt.close(fig) + raise SystemExit + +# Main loop +try: + # Set up the serial connection (adjust the COM port as needed) + ser = serial.Serial('/dev/cu.usbmodem14101', 9600, timeout=1) + while not exit_flag: + line = ser.readline().decode('utf-8').strip() + if line: + try: + # Split the line into groups and then into temperature and humidity values + groups = line.split(';') + if len(groups) == 16: + timestamp = datetime.now().strftime('%H:%M:%S') + data['Timestamp'].append(timestamp) + temps = [] + hums = [] + for i, group in enumerate(groups): + temp, hum = map(float, group.split(',')) + temps.append(temp) + hums.append(hum) + data[f'Temp{i+1}'].append(temp) + data[f'Hum{i+1}'].append(hum) + + # Update temperature graph with latest 20 points + ax_temp.clear() + ax_temp.set_title('Temperature') + ax_temp.set_xlabel('Time') + ax_temp.set_ylabel('Temperature (°C)') + for i in range(16): + ax_temp.plot(data['Timestamp'][-max_points:], data[f'Temp{i+1}'][-max_points:], label=f'Temp{i+1}') + + # Update humidity graph with latest 20 points + ax_hum.clear() + ax_hum.set_title('Humidity') + ax_hum.set_xlabel('Time') + ax_hum.set_ylabel('Humidity (%)') + for i in range(16): + ax_hum.plot(data['Timestamp'][-max_points:], data[f'Hum{i+1}'][-max_points:], label=f'Hum{i+1}') + + plt.pause(0.5) + except ValueError as e: + print(f"Could not convert data to float: {line}, error: {e}") +except KeyboardInterrupt: + plt.ioff() +finally: + # Save the data to a CSV file + df = pd.DataFrame(data) + csv_filename = 'arduino_data.csv' + df.to_csv(csv_filename, index=False) + print(f"Data saved to '{csv_filename}'") + ser.close() +``` + +python_plot diff --git a/seeed-studio-xiao.png b/seeed-studio-xiao.png new file mode 100644 index 0000000..d48402d Binary files /dev/null and b/seeed-studio-xiao.png differ