Tutorial MCP23017 verses PCA9535

In the tutorial I was getting this error

Traceback (most recent call last):
File "/home/pi/led.py", line 5, in <module>
bus = IOPi(0x21)
File "/usr/local/lib/python3.9/dist-packages/IOPi/IOPi.py", line 117, in __init__
self.__bus.write_byte_data(self.__ioaddress, self.IOCON, self.__conf)
File "/usr/local/lib/python3.9/dist-packages/smbus2/smbus2.py", line 455, in write_byte_data
ioctl(self.fd, I2C_SMBUS, msg)
OSError: [Errno 121] Remote I/O error

Trying to see what was wrong I noticed the IOPi is written for the MCP23017. Pulling up the

datasheet for the current IO PiZero PCA9535 the command structure is different. Is the IO32

tutorial valid?



Inobu

102:~ $ sudo i2cdetect -y 1


0 1 2 3 4 5 6 7 8 9 a b c d e f
00: -- -- -- -- -- -- -- --
10: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
20: 20 21 -- -- -- -- -- -- -- -- -- -- -- -- -- --
30: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
40: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
50: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
60: -- -- -- -- -- -- -- -- -- -- -- -- -- -- -- --
70: -- -- -- -- -- -- -- --

ok, I found the problem. I was linked to the old tutorial

I should have been here.

https://www.abelectronics.co.uk/kb/article/1099/io-zero-32-tutorial-1---the-blinking-led

Inobu