====== 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 2x4 headers. The board is widely available from a number of Chinese vendors, sometimes called a Coexistence Module. This is not the cheaper AI-Thinker "yellow board" (which should have its own entry on this page). 

=== 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       | DC_R_ON      | ON=Connect ESP TX line to MCU RX line.  |
| 2       | DC_T_ON      | ON=Connect ESP RX line to MCU TX line.  |
| 3       | ESP_T_ON     | ON=Connect ESP TX line to CH340.        |
| 4       | MCU_T_ON     | ON=Connect MCU TX line to CH340.        |
| 5       | ESP_R_ON     | 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       | ON=AC relay controlled by ESP8266 GPIO14         |
| 2       | DL_MCU       | ON=AC relay controlled by MCU                    |
| 3       | CH_PD_H      | ON=Enable pull up on CH_PD line of ESP8266.      |
| 4       | GPIO0_L      | ON=Pull ESP8266 GPIO0 down for flashing.         |
| 5       | GPIO15_L     | ON=Pull ESP8266 GPIO15 down (normal during boot) |
| 6       | GPIO2_L      | ON=Pull ESP8266 GPIO2 down for ?                 |

===Relay===
Normally open, it can bridge the two AC terminal connections together.  See above for control.  High level closes the relay.  Handles 3 amps at 35v DC or 3 amps at 250v AC.

===Buzzer===
Annoying.  Apparently controlled only by MCU?

===CDS Light Sensor===
One is installed on the board, connected to the MCU.  Holes for another wired to the ESP8266 ADC are in place but not populated with a sensor presumably because this version breaks out the ADC for independent use.

===Schematic===
What is apparently an older version may be found in [[http://www.esp8266.com/viewtopic.php?f=13&t=480|this thread.]]