I'm looking at the datasheet for an I2C expander IC MCP23009 http://ww1.microchip.com/downloads/en/DeviceDoc/22121b.pdf and it uses a single pin with a voltage divider (two resistors ~5% tolerance) to determine the I2C address. For 3 address a three post jumper with a resistor divider would work. S…

Eight analog voltages as simple (fewest parts) as possible?

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