The following table lists all devices and boards currently supported by the Pi GPIO plugin v1.0.0. Live links will take you to web pages providing additional details.

Manufacturer	Functions	Bus	Devices	Description
Microchip Technology	8-Bit DIO	I2C SPI	MCP23008 MCP23S08	8-Bit IO Expander with Serial Interface
Microchip Technology	16-Bit DIO	I2C SPI	MCP23017 MCP23S17	16-Bit IO Expander with Serial Interface
Microchip Technology	12-Bit ADC	SPI	MCP3202	2.7V Dual Channel 12-Bit A/D Converter with SPI Serial Interface
Microchip Technology	12-Bit ADC	SPI	MCP3204 MCP3208	2.7V 4/8-Channel 12-Bit A/D Converters with SPI Serial Interface
Microchip Technology	18-Bit ADC	I2C	MCP3422 MCP3423 MCO3424	18-Bit, 2/4-Channel ΔΣ Analog-to-Digital Converter with I2C Interface and On-Board Reference
Microchip Technology	8-Bit DAC 10-Bit DAC 12-Bit DAC	SPI	MCP4801 MCP4811 MCP4821	8/10/12-Bit Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
Microchip Technology	8-Bit DAC 10-Bit DAC 12-Bit DAC	SPI	MCP4802 MCP4812 MCP4822	8/10/12-Bit Dual Voltage Output Digital-to-Analog Converter with Internal VREF and SPI Interface
AB Electronics	16-Bit DIO 12-Bit ADC / 8 12-Bit DAC / 2 RTC	I2C SPI SPI I2C	MCP23017 MCP3208 MCP4822 DS1307	Expander Pi HAT (RTC not supported)
AB Electronics	32-Bit DIO	I2C	2 X MCP23017	IO Pi Plus HAT
AB Electronics	17-Bit ADC / 8 Single Ended	I2C	2 X MCP3424	ADC Pi HAT
AB Electronics	18-Bit ADC / 8 Differential	I2C	2 X MCP3424	ADC Differential Pi HAT
AB Electronics	12-Bit ADC / 2 12-Bit DAC / 2	SPI	MCP3202 MCP4822	ADC-DAC Pi Zero HAT
52Pi	RLY / 4	I2C		DockerPi 4-Channel Relay HAT

If you don't see your favorite chip or HAT in the table, post a request on papamac's Pi GPIO user forum. It will be considered in future releases.