Raspberry Pi 3 Cookbook for Python Programmers - Third Edition

How to do it...

1. The i2cdetect command is used to detect the I²C devices (the --y option skips any warnings about possible interference with other hardware that could be connected to the I²C bus). The following commands are used to scan both the buses:

sudo i2cdetect -y 0
sudo i2cdetect -y 1 

2. Depending on your Raspberry Pi board revision, the address of the device should be listed on bus 0 (for Model B Rev1 boards) or bus 1 (for Raspberry Pi 2 and 3, and Raspberry Pi 1 Model A and Model B Revision 2). By default, the PCF8591 address is 0x48:

I2C bus number to use	Bus 00	Bus 11
Raspberry Pi 2 and 3	HAT ID (I2C_VC)	GPIO (I2C_ARM)
Model A and Model B Revision 2	P5	GPIO
Model B Revision 1	GPIO	N/A

3. The following ...