18、树莓派传感器节点项目：从测试到数据采集

树莓派传感器节点项目：从测试到数据采集

1. 传感器测试

要测试传感器，需以root权限运行脚本 python3 ./pi_bmp280.py 。运行后可能不会立即看到输出，但一两秒内会开始显示类似如下的输出：

$ python3 ./pi_bmp280.py
The barometric pressure at altitude 1007.25 is 50.37 hPa.
The barometric pressure at altitude 1007.28 is 50.24 hPa.
The barometric pressure at altitude 1007.24 is 50.40 hPa.
The barometric pressure at altitude 1007.24 is 50.74 hPa.
The barometric pressure at altitude 1007.22 is 50.45 hPa.
The barometric pressure at altitude 1007.25 is 50.27 hPa.
The barometric pressure at altitude 1007.25 is 49.83 hPa.
The barometric pressure at altitude 1007.26 is 50.19 hPa.
The barometric pressure at altitude 1007.27 is 50.16 hPa.

BMP280传感器不仅能读取气压，还能读取温度。可以修改之前的代码，使其同时读取温