Adafruit MAX 31856与树莓通讯

Question

我一直试图读取我的树莓树上的热电偶温度，但是不能让树莓树与adafruit MAX 31856通信。我已经下载了必要的库，并检查了所有连接都是安全和正确的，但是当我试图执行此代码时，总是遇到此错误。

任何帮助都是非常感激的!

import board 
import digitalio 
import adafruit_max31856 
spi = board.SPI() 
cs = digitalio.DigitalInOut(board.D5) 
cs.direction = digitalio.Direction.OTUPUT 
thermocouple = adafruit_max31856.MAX31856(spi,cs) 
print(thermocouple.temperature) 

错误:

Traceback (most recent call last): 
File "/home/pi/test4.py", line 6, in <module> 
spi = board.SPI() 
File "/usr/local/lib/python3.7/dist-packages/board.py", line 299, in SPI 
return busio.SPI(SCLK, MOSI, MISO) 
File "/usr/local/lib/python3.7/dist-packages/busio.py", line 289, in __init__ 
self._spi = _SPI(portId) 
File "/usr/local/lib/python3.7/dist-packages/adafruit_blinka/microcontroller/generic_linux/spi.py", line 25, in __init__ 
self._spi = spi.SPI(device=(portid, 0)) 
File "/usr/local/lib/python3.7/dist-packages/Adafruit_PureIO/spi.py", line 167, in __init__ 
raise IOError("{} does not exist".format(device)) 
OSError: /dev/spidev0.0 does not exist

代码错误

Answer 1

很可能存在为sp0 -0加载的设备驱动程序，它删除了/dev/spidev0.0设备。检查你的/boot/config.txt覆盖加载MAX 31856驱动程序模块。如果你想使用adafruit_max31856库，你不应该加载这个驱动程序。希望能有所帮助