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Table of Contents
Boards
Node MCU
Node MCU who provides the LUA firmware also propose evaluation boards: http://nodemcu.com/index_en.html#fr_54747661d775ef1a3600009e
ESPToy
An Arduino + ESP-01 board, with an ATMega 644: http://rayshobby.net/cart/esptoy
ATMega 644 has two hardware serial ports
Olimex ESP8266-EVB EValuation Board
ESP8266-EVB is Evaluation board for ESP8266 with relay, button, UEXT, all GPIOs available on 0.1“ header https://www.olimex.com/Products/IoT/ESP8266-EVB/
AI-Thinker 'Test Board'
The AI-Thinker board is an evaluation board with an onboard STC15L204EA microcontroller along with a relay, buttons and LEDs on all GPIOs, a relay, a buzzer, LDR, a socket for NRF240 modules, CH340 USB to Serial converter and DIP switches allowing different IO routing configurations to be setup. A small adapter board connects the normal ESP8266 modules to a pair of 2×4 headers. The board is widely available from a number of Chinese vendors.
DIP Switches
Serial Data Switch
This is the left-most switch when the USB port is at top. Controls routing of the serial data lines.
| No. | Label | Function |
| 1 | DCRON | ON=Connect ESP TX line to MCU RX line. |
| 2 | DCTON | ON=Connect ESP RX line to MCU TX line. |
| 3 | ESPTON | ON=Connect ESP TX line to CH340. |
| 4 | MCUTON | ON=Connect MCU TX line to CH340. |
| 5 | ESPRON | ON=Connect ESP RX line to CH340. |
| 6 | MCU_R_ON | ON=Connect MCU RX line to CH340. |
So, to achieve the following standard configurations set the dip switch as follows:
| Configuration | 1 | 2 | 3 | 4 | 5 | 6 |
| MCU connected to CH340 | OFF | OFF | OFF | ON | OFF | ON |
| ESP8266 connected to CH340 | OFF | OFF | ON | OFF | ON | OFF |
| MCU connected to ESP8266 | ON | ON | OFF | OFF | OFF | OFF |
IO Switch
This is the right-most switch when the USB port is at top. Controls routing of some of the IO and signal lines.
| No. | Label | Function |
| 1 | GPIO14 | ? |
| 2 | DLMCU | ? | | 3 | CHPDH | ON=Enable pull up on CHPD line of ESP8266. | |
| 4 | GPIO0H | ? | | 5 | GPIO15H | ? |
| 6 | GPIO2_H | ? |