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This will search /dev/i2c-1 for all address, and if an Adafruit PWM/Servo HAT is properly connected and it's set to its

default address -- meaning none of the 6 address solder jumpers at the top of the board have been soldered shut -- it

should show up at 0x40 (binary 1000000) as follows:

Once both of these packages have been installed, and i2cdetect finds the 0x40 I2C address, you have everything you

need to get started accessing I2C and SMBus devices in Python.