2022-10-17 22:41:06 +00:00
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:PROPERTIES:
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:ID: d97fde4a-0e91-40f9-ac57-d0cd67295d14
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:END:
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2023-03-21 04:40:28 +00:00
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#+title: ESP8266
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2022-10-17 22:41:06 +00:00
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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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