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Updated Setting Up the I O Pins (markdown)

bdring
2019-09-15 09:39:12 -05:00
parent e025cb1436
commit ca45ba077e
1 changed files with 7 additions and 2 deletions
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Setting-Up-the-I-O-Pins.md

@@ -8,13 +8,18 @@ Here are the pins you can use. Be very careful to only use each I/O pin in one p
### Usable I/O pins
- GPIO_NUM_2 (Some dev boards have an LED on this. It works better as an output)
- GPIO_NUM_2
- Some dev boards have an LED on this. It works better as an output
- [It must be either left unconnected/floating, or driven Low, in order to enter the serial bootloader.]( https://github.com/espressif/esptool/wiki/ESP32-Boot-Mode-Selection)
- GPIO_NUM_4
- GPIO_NUM_5 - (Used by SD Card)
- GPIO_NUM_12
- [If driven High, flash voltage (VDD_SDIO) is 1.8V not default 3.3V. Has internal pull-down, so unconnected = Low = 3.3V. May prevent flashing and/or booting if 3.3V flash is used and this pin is pulled high, causing the flash to brownout. See the ESP32 datasheet for more details](https://github.com/espressif/esptool/wiki/ESP32-Boot-Mode-Selection)
- GPIO_NUM_13
- GPIO_NUM_14 (some pulses at boot)
- GPIO_NUM_15 (some pulses at boot)
- GPIO_NUM_15
- Some pulses at boot
- [If driven Low, silences boot messages printed by the ROM bootloader. Has an internal pull-up, so unconnected = High = normal output](https://github.com/espressif/esptool/wiki/ESP32-Boot-Mode-Selection)
- GPIO_NUM_16
- GPIO_NUM_17
- GPIO_NUM_18 - (Used by SD Card)