"RuntimeError: I2C slave address was NACK'd" with SCD30 on MCP2221A breakout #2
Description
Might be related to adafruit/Adafruit_Blinka#262 but comment there said different boards should have different issues.
I'm using the sample from the SCD30 library docs:
import board import busio import adafruit_scd30 i2c = busio.I2C(board.SCL, board.SDA) scd = adafruit_scd30.SCD30(i2c) while True: # since the measurement interval is long (2+ seconds) we check for new data before reading # the values, to ensure current readings. if scd.data_available: print("Data Available!") print("eCO2:", scd.eCO2, "PPM") print("Temperature:", scd.temperature, "degrees C") print("Humidity:", scd.relative_humidity, "%%rH") print("") print("Waiting for new data...") print("") time.sleep(0.5)Windows 10 2004, Adafruit MCP2221 breakout, Adafruit SCD30 breakout, Python 3.9.1 (installed with Scoop). The SCD30 works fine on the QT-Py I have here.
ryanp@RYZENSHINE-WIN venv E:\src-ssd\scd30 [09:57] ❯ $env:BLINKA_MCP2221=1 ryanp@RYZENSHINE-WIN venv E:\src-ssd\scd30 [09:57] ❯ & e:/src-ssd/scd30/venv/Scripts/python.exe e:/src-ssd/scd30/test.py Traceback (most recent call last): File "e:\src-ssd\scd30\test.py", line 8, in <module> scd = adafruit_scd30.SCD30(i2c) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_scd30.py", line 66, in __init__ self.measurement_interval = 2 File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_scd30.py", line 93, in measurement_interval self._send_command(_CMD_SET_MEASUREMENT_INTERVAL, value) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_scd30.py", line 220, in _send_command i2c.write(self._buffer, end=end_byte) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_bus_device\i2c_device.py", line 102, in write self.i2c.writeto(self.device_address, buf, start=start, end=end) File "E:\src-ssd\scd30\venv\lib\site-packages\busio.py", line 115, in writeto return self._i2c.writeto(address, memoryview(buffer)[start:end], stop=stop) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_blinka\microcontroller\mcp2221\i2c.py", line 19, in writeto self._mcp2221.i2c_writeto(address, buffer, start=start, end=end) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_blinka\microcontroller\mcp2221\mcp2221.py", line 315, in i2c_writeto self._i2c_write(0x90, address, buffer, start, end) File "E:\src-ssd\scd30\venv\lib\site-packages\adafruit_blinka\microcontroller\mcp2221\mcp2221.py", line 233, in _i2c_write raise RuntimeError("I2C slave address was NACK'd") RuntimeError: I2C slave address was NACK'd Metadata
Metadata
Assignees
Labels
No labels