GPIO						Arduino
0		SPI_CS2		HIGH: normal, LOW: programming	LOW / HIGH	D3	button LOW / BLK
1		SPI_CS1	U0_TXD		TX	D10	TX
2			U1_TXD	on boot HIGH for programming	HIGH	D4	One WIRE (HIGH)
3			U0_RXD		RX	D9	RX
4					I2C	D2/SDA	SDA
5					I2C	D1/SCL	SCL
6	SDIO_CLK	SPI_CLK		used to connect flash 4MB	reserved
7	SDIO_DATA0	SPI_MISO		used to connect flash 4MB	reserved
8	SDIO_DATA1	SPI_MOSI	U1_RXD	used to connect flash 4MB	reserved
9	SDIO_DATA2	SPI_HD	HSPI_HD	used to connect flash 4MB	reserved
10	SDIO_DATA3	SPI_WP	HSPI_WP	used to connect flash 4MB	reserved
11	SDIO_CMD	SPI_CS0		used to connect flash 4MB	reserved
12	MTDI	HSPI_MISO			MISO	D6	PWM R
13	MTCK	HSPI_MOSI	U0_CTS		MOSI	D7	PWM G
14	MTMS	HSPI_CLK			CLK	D5	PWM B
15	MTDO	HSPI_CS	U0_RTS	on boot LOW for programming	LOW / CS	D8	PWM W (LOW)
16	XPD_DCDC			sleep mode to EXT_RSTB (allow deep sleep)	RESET	D0	RST
17	ADC			voltage 0—1.0V	Battery	A0
RESET							Pull UP

15: WS2812, adressable led

Read information on: https://www.kloppenborg.net/images/blog/esp8266/esp8266-esp12e-specs.pdf

Available pins: http://www.rabbithacks.com/esp8266/esp12-e-directly-usable-gpio-pins/

PWM on all the pins ! HSPI (screen or other): 12 13 14 15 PWM: R12 G15 B13 ADC: TOUT I2C: SCL14 SDA2

Flashing board ?

You need to maintain SW2 while pressing SW1 (reset) in order to set the ESP-12E in programing mode.

• https://hackaday.com/2015/03/18/how-to-directly-program-an-inexpensive-esp8266-wifi-module/
• https://easyeda.com/olegos76/ESP8266_arduino_IDE-d4457f9439fd4de7a8970ff36a4957d6
• https://www.instructables.com/id/3-Simple-Ways-of-Programming-an-ESP8266-12X-Module/
• https://www.codeproject.com/Articles/1152777/Programming-a-standalone-ESP-using-Arduino-IDE-and

Programming from the arduino a nodeMcu

• https://www.instructables.com/id/Quick-Start-to-Nodemcu-ESP8266-on-Arduino-IDE/
• https://www.instructables.com/id/ESP8266-controlling-Neopixel-LEDs-using-Arduino-ID/

MQTT+Node-RED

https://randomnerdtutorials.com/esp8266-and-node-red-with-mqtt/

With SSL (secure)? :

https://medium.com/@flespi/how-to-connect-esp8266-to-secure-mqtt-broker-know-it-all-and-get-it-done-approach-c33b94f37d88

https://hackaday.io/project/163666-secure-esp8266-mqtt-poc/log/158992-secure-mqtt-broker-setup

FreeRTOS

It seems impossible to program the ESP-12E with RTOS from the Arduino IDE.

The SDK is maintained by Expressif and it svailable on:

https://github.com/espressif/ESP8266_RTOS_SDK

You will also find on this page the instructions to install the SDK

Functions

• RGBW
• PCA9685 + 4 x BSP75
• WS2812 : addressable led
• Luminosity: TCS3400 or VEML6040 or VEML7700
• Pressure: MS5637
• Humidity / Temperature: ChipCAP2 or Si7021
• Power monitoring