我有以下代码不起作用并给我一条错误消息。 我不太确定，但在错误消息中它说 i2c 地址 77。但是i2c检测显示76。 数字 48 是同一总线上的 ADC，工作正常。
有没有人知道什么可能导致问题？ 我瘦了可能是，默认的 i2c 地址是 77。我的设备之一是 76。是否可以以某种方式在 adafruit lib 中更改它？
法典：
import board
import busio
import adafruit_bme280
# Create library object using our Bus I2C port
i2c = busio.I2C(board.SCL, board.SDA)
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
# OR create library object using our Bus SPI port
# spi = busio.SPI(board.SCK, board.MOSI, board.MISO)
# bme_cs = digitalio.DigitalInOut(board.D10)
# bme280 = adafruit_bme280.Adafruit_BME280_SPI(spi, bme_cs)
# change this to match the location's pressure (hPa) at sea level
bme280.sea_level_pressure = 1013.25
while True:
print("nTemperature: %0.1f C" % bme280.temperature)
print("Humidity: %0.1f %%" % bme280.humidity)
print("Pressure: %0.1f hPa" % bme280.pressure)
print("Altitude = %0.2f meters" % bme280.altitude)
time.sleep(2)
错误：
$ python3 i2ctest.py
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 184, in __probe_for_device
self.i2c.writeto(self.device_address, b"")
File "/home/pi/.local/lib/python3.7/site-packages/busio.py", line 101, in writeto
return self._i2c.writeto(address, buffer, stop=stop)
File "/home/pi/.local/lib/python3.7/site-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 46, in writeto
self._i2c_bus.write_bytes(address, buffer[start:end])
File "/home/pi/.local/lib/python3.7/site-packages/Adafruit_PureIO/smbus.py", line 308, in write_bytes
self._device.write(buf)
OSError: [Errno 121] Remote I/O error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 190, in __probe_for_device
self.i2c.readfrom_into(self.device_address, result)
File "/home/pi/.local/lib/python3.7/site-packages/busio.py", line 89, in readfrom_into
return self._i2c.readfrom_into(address, buffer, stop=stop)
File "/home/pi/.local/lib/python3.7/site-packages/adafruit_blinka/microcontroller/generic_linux/i2c.py", line 53, in readfrom_into
readin = self._i2c_bus.read_bytes(address, end - start)
File "/home/pi/.local/lib/python3.7/site-packages/Adafruit_PureIO/smbus.py", line 179, in read_bytes
return self._device.read(number)
OSError: [Errno 121] Remote I/O error
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "i2ctest.py", line 9, in <module>
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c)
File "/usr/local/lib/python3.7/dist-packages/adafruit_bme280.py", line 482, in __init__
self._i2c = i2c_device.I2CDevice(i2c, address)
File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 69, in __init__
self.__probe_for_device()
File "/usr/local/lib/python3.7/dist-packages/adafruit_bus_device/i2c_device.py", line 192, in __probe_for_device
raise ValueError("No I2C device at address: %x" % self.device_address)
ValueError: No I2C device at address: 77
I2C 检测：
i2cdetect -y 1
0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- 48 -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- 76 --
添加您的特定 I2C 地址，如文档中所述：
class adafruit_bme280.Adafruit_BME280_I2C(i2c, address=<sphinx.ext.autodoc.importer._MockObject object>)
它应该看起来像：
bme280 = adafruit_bme280.Adafruit_BME280_I2C(i2c, address=0x76)
我自己发现了。
问题确实在于地址。库中的默认地址为 0x77。 我的传感器板0x76了。
但是如果你非常仔细地检查，你可以看到三个焊盘。左边和中间的通过一条路线连接。如果你剪掉这条路线(用针或其他东西(并连接中间和右边的路线，地址将更改为0x77，并且库工作正常:)
这就是我的传感器的样子。