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# ESP8266
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* [Reference](https://randomnerdtutorials.com/esp8266-pinout-reference-gpios/)
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* 
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* Best Pins to Use
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Label | GPIO | Input | Output | Notes
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---|----|----|----|----|----
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D0 | GPIO16 | no interrupt | no PWM or I2C support | HIGH at boot used to wake up from deep sleep
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D1 | GPIO5 | OK | OK | often used as SCL (I2C)
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D2 | GPIO4 | OK | OK | often used as SDA (I2C)
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D3 | GPIO0 | pulled up | OK | connected to FLASH button, boot fails if pulled LOW
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D4 | GPIO2 | pulled up | OK | HIGH at boot connected to on-board LED, boot fails if pulled LOW
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D5 | GPIO14 | OK | OK | SPI (SCLK)
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D6 | GPIO12 | OK | OK | SPI (MISO)
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D7 | GPIO13 | OK | OK | SPI (MOSI)
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D8 | GPIO15 | pulled to GND | OK | SPI (CS) Boot fails if pulled HIGH
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RX | GPIO3 | OK | RX pin | HIGH at boot
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TX | GPIO1 | TX pin | OK | HIGH at boot debug output at boot, boot fails if pulled LOW
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A0 | ADC0 | Analog Input | X
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