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esp8266-test-boards [2015/01/25 21:22] gregware created |
esp8266-test-boards [2016/06/16 15:55] livetelevision [AI-Thinker 'Test Board'] |
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+ | ====== Boards ====== | ||
+ | |||
+ | |||
==== Node MCU ==== | ==== Node MCU ==== | ||
Node MCU who provides the LUA firmware also propose evaluation boards: | Node MCU who provides the LUA firmware also propose evaluation boards: | ||
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==== Olimex ESP8266-EVB EValuation Board ==== | ==== Olimex ESP8266-EVB EValuation Board ==== | ||
ESP8266-EVB is Evaluation board for ESP8266 with relay, button, UEXT, all GPIOs available on 0.1" header | ESP8266-EVB is Evaluation board for ESP8266 with relay, button, UEXT, all GPIOs available on 0.1" header | ||
- | [[https://www.olimex.com/Products/Modules/Ethernet/ESP8266-EVB/open-source-hardware]] | + | [[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.]] |