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Our Raspberry Pi Expansion boards use either the I2C pins, UART or SPI pins on the Raspberry Pi 's GPIO header.
All of the other GPIO pins are available to use via the stacking header connector.
The following expansion boards use the I2C GPIO pins:
1 Wire Pi Plus and 1 Wire Pi Zero
ADC Differential Pi
IO Pi, IO Pi Plus and IO Pi Zero
The following expansion boards use the SPI GPIO pins:
ADC-DAC Pi Zero
The following expansion boards use the UART GPIO pins:
Serial Pi, Serial Pi Plus and Serial Pi Zero
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