Configuration
Revision as of 12:32, 29 May 2017 by Grovkillen (talk | contribs) (Created page with "== GPIO on ESP8266 == {| class="wikitable sortable" |- ! GPIO Number ! GPIO Name ! Boot State ! Precautions and information |- | 0 | D3 | HIGH for boot<br/>LOW for serial p...")
GPIO on ESP8266
| GPIO Number | GPIO Name | Boot State | Precautions and information |
|---|---|---|---|
| 0 | D3 | HIGH for boot LOW for serial programming |
Pullup resistor on most boards |
| 1 | Used as serial (TX) May be used but observe that signal might flicker due to serial activity during boot. | ||
| 2 | D4 | HIGH for boot HIGH for serial programming |
Connected to onboard LED (low active) Used as serial1 (TX1) |
| 3 | Used as serial (RX) May be used but observe that signal might flicker due to serial activity during boot. | ||
| 4 | D2 | Generally used as SDA (I2C) | |
| 5 | D1 | Generally used as SCL (I2C) | |
| 6 | Do not use! Reserved for SPI + flash | ||
| 7 | Do not use! Reserved for SPI + flash | ||
| 8 | Do not use! Reserved for SPI + flash | ||
| 9 | D11 | Do not use! Reserved for SPI + flash | |
| 10 | D12 | Use with caution! Reserved for SPI + flash | |
| 11 | Do not use! Reserved for SPI + flash | ||
| 12 | D6 | ||
| 13 | D7 | ||
| 14 | D5 | ||
| 15 | D8 | LOW for boot | Pulldown resistor on most boards |
| 16 | D0 | No PWM. No internal pullup available. Used in sleep mode for wakeup |
