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This sheets documents the GPIO allocation for the AtariWifi device (AKA FujiNet SIO Adaptor)
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Only certain GPIO's are available for use on the ESP8266. A good reference is
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https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/
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NotesAtariWifiLabelGPIOInputOutputNotes
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Use pull down mode on inputMotorD0GPIO16no interrupt
no PWM or I2C support
HIGH at boot
used to wake up from deep sleep
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InterruptD1GPIO5OKOKoften used asSCL(I2C)
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TBDProceedD2GPIO4OKOKoften used asSDA(I2C)
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connected to USB /RTS-D3GPIO0pulled upOKconnected to FLASH button, boot fails if pulled LOW
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Debug Serial TXDebug Serial TXD4GPIO2pulled upOK
HIGH at boot
connected to on-board LED, boot fails if pulled LOW
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TBDClockInD5GPIO14OKOKSPI(SCLK)
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CommandD6GPIO12OKOKSPI(MISO)
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Data OutD7GPIO13OKOKSPI(MOSI)
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Must be LO at bootData InD8GPIO15
pulled to GND
OKSPI(CS)
Boot fails if pulled HIGH
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USB-RXGPIO3OKRX pinHIGH at boot
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USB-TXGPIO1TX pinOK
HIGH at boot
debug output at boot, boot fails if pulled LOW
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-A0ADC0Analog InputXAnalog Only - 3.3V NodeMCU
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