树莓派温度检测输出折线图
时间: 2024-10-23 10:04:49 浏览: 37
树莓派可以用来做温度检测并将其数据可视化成折线图,通常需要通过硬件传感器如DHT11、DS18B20等获取实时温度,然后配合编程语言如Python和相应的库(比如Raspberry Pi.GPIO和matplotlib)来完成。
步骤如下:
1. **硬件准备**:连接温度传感器到树莓派,并确保GPIO口正确配置。
2. **安装依赖库**:在树莓派上运行`sudo apt-get install python-smbus`安装I2C库,对于matplotlib则可以通过pip安装`pip install matplotlib`。
3. **编写Python脚本**:创建一个Python文件,导入所需的模块,如`RPi.GPIO`, `smbus`, 和 `matplotlib.pyplot`。编写函数读取温度值,绘制温度随时间变化的折线图。
```python
import RPi.GPIO as GPIO
import smbus
import time
import matplotlib.pyplot as plt
# ...其他设置...
def read_temperature(sensor):
# 读取传感器数据
data = bus.read_i2c_block_data(sensor_address, register)
temperature = ((data[1] * 256 + data[0]) * 0.1) - 45 # 根据传感器型号调整公式
return temperature
def plot_temperature(data_points):
# 绘制折线图
_, ax = plt.subplots()
ax.plot(data_points)
ax.set_xlabel('Time')
ax.set_ylabel('Temperature (°C)')
plt.show()
# 主循环,持续读取和绘制温度
if __name__ == "__main__":
bus = smbus.SMBus(1) # 这里假设使用I2C总线1
sensor_address = 0x48 # DHT11传感器地址
while True:
temp = read_temperature(sensor_address)
data_points.append(temp)
plot_temperature(data_points)
time.sleep(60) # 每分钟更新一次
```
4. **执行与监控**:运行上述Python脚本,树莓派会定期更新并显示温度折线图。
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