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General info
ESP8266 is a SOC module contains:
- CPU: Tensilca Xtensa LX3, 32bit, 80MHz
- RAM: 32kB, DRAM 80kB, Flash 200kB
- WiFi 802.11 b/g/n (soft AP mode available)
- and more
Additionally on PCB:
- External SPI Flash 512kB with firmware
Device is 3,3V only and can consume over 200mA. Some FTDI or PL2303 conventers are capable to provide 3,3V VCC but the power is not enough to provide stable supply.
Memory MAP: http://www.esp8266.com/wiki/doku.php?id=esp8266_memory_map
esp8266_specifications_english.pdf
0a-esp8266_datasheet_en_v4.3.pdf
External software
Pinout
| Pin # | GPIO | role / description | |||
|---|---|---|---|---|---|
| 15 | GPIO0 | FLSH | SPI_CS2 | !!! Must be H during bootup. L=boot from UART | |
| 26 | GPIO1 | UART0_TXD | SPI_CS1 | UART TX during flash programming 3,3V ! | |
| 14 | GPIO2 | UART1_TXD | UART TX during flash programming | ||
| 25 | GPIO3 | UART0_RXD | UART Rx during flash programming 3,3V ! | ||
| 16 | GPIO4 | ||||
| 24 | GPIO5 | ||||
| 21 | GPIO6 | SPI_CLD | SD_CLK | ||
| 22 | GPIO7 | SPI_MISO | SD_D0 | ||
| 23 | GPIO8 | SPI_MOSI | SD_D1 | ||
| 18 | GPIO9 | HSPI_HD | SPI_HD | SD_D2 | |
| 19 | GPIO10 | HSPI_WP | SPI_WP | SD_D3 | |
| 20 | GPIO11 | SPI_CS0 | SD_CMD | ||
| 10 | GPIO12 | HSPI_MISO | MTDI | ||
| 12 | GPIO13 | HSPI_MOSI | MTCK | UART0_CTS / UART0_RXD2 | Note: there is UART Swap register, and UART0 can be muxed to GPIO13 and GPIO15 |
| 9 | GPIO14 | HSPI CLK | MTMS | ||
| 13 | GPIO15 | HSPI CS | MTDO | UART0_RTS / UART0_TXD2 | !!! Must be L durign bootup (H=SDIO mode) |
| 8 | GPIO16 | XPD_DCDC | Depp sleep Timer output / USER / WAKE. Connect it to reset ping to wakeup from Deep Sleep mode | ||
| 7 | CH_PD | CHIP_EN | Chip power down - to enable chip needs to be pulled up | ||
| 32 | EXT_RSTB | External reset signal (active low) | |||
| 6 | T_OUT | ADC | |||
| 11 | VDDPST | Digital I/O Power Supply (1.8V~3.3V) | |||
| 17 | VDDPST | Digital I/O Power Supply (1.8V~3.3V) | |||
| 29 | VDD | Analog power 3.0V~3.6V | |||
| 30 | VDDA | Analog power 3.0V~3.6V | |||
| 27 | XTAL_OUT | ||||
| 28 | XTAL_IN | ||||
| 31 | RES12K | Serial connection with a 12kOhm resistor do ground | |||
Firmwares
Own firmware in C
AT command
NodeMCU
It is LUA based firmware (command interpreter). https://github.com/nodemcu/nodemcu-firmware
NodeLua
ESP Easy
The ESP Easy firmware can be used to turn the ESP module into an easy multifunction sensor device for Home Automation solutions like Domoticz. Configuration of the ESP Easy is entirely web based, so once you've got the firmware loaded, you don't need any other tool besides a common web browser. http://www.esp8266.nu
Wiki page ESP Easy