README.md
UartWiFiBoard


The UartWiFiBoard is designed as asynchronous serial communication via WiFi.
This board is based on ESP-WROOM-02(esp8266) chip and will be mainly used for the transparent WiFi-serial bridge.
For running standalone, the board has a voltage regulator and some user-interfaces.
The UartWiFiBoard is an easy way to connect your board wirelessly to the Internet.
If you flash Sample software on this repository, the board works as the transparent WiFi-serial bridge.
I made video that is <![CDATA[]]>how to use UartWiFiBoard<![CDATA[]]>. You can watch it on Youtube.

Some highlights of the UartWiFiBoard:


Main core: ESP-WROOM-02(ESP8266).
Voltage regulator(3.3V) with control pin.
Opto-isolated UART interface(Uart interface circuit accepts 3.3V and 5.0V).
On board WiFi-microcontroller can use following functions.


LED1 connected to "IO0" H:OFF L:ON(the sample software indicate WiFi status)
LED2 connected to "IO2" H:OFF L:ON(the sample software indicate UART activity)
Control voltage regulator's control pin connected to "IO14" H:Enable L:Disabale(normally)
Voltage detection circuit(for CN1) connected to "TOUT" with forced low switch(SW2)


The sample software use this feature due to prevent battery over-discharge and the switch(SW2) behaves like power-off function.


Measures 40mm x 50mm x 10mm


Repository Contents


/Hardware - All Eagle design files (.brd, .sch)
/Software - Software files for this hardware


Description(Pin Interfaces)



CN1(Primarily) Pin Descriptions:

This connector is the supply voltage and input for the voltage detector.
- VBAT: Up to 12.0VDC convert to 3.3VDC.
- GND: GND.

CN3(Primarily) Pin Descriptions:

This connector is for Flashing a program to WiFi-microcontroller.
If you change BOOT MODE, To be selected BOOT MODE before supply voltage.
- VCC: Restrictly 3.3VDC.
- TX: UART TX.
- RX: UART RX.
- GND: GND.
- BOOT MODE: Connected to "IO0" H:Flash boot(normally) L:UART download

If you are interested in more useful uart module, please see the <![CDATA[]]>General Serial Communication Board<![CDATA[]]>.

CN2(Secondary) Pin Descriptions:

This connector is for your target boart UART-interface.
- VIN: This is the power supply pin with a voltage range of 2.7 to 5.5VDC.
- TX: UART TX(Open collector output).
- RX: UART RX.
- GND: GND.

How to upload program

See this page

License

The repository is released under <![CDATA[]]>Creative Commons ShareAlike 4.0 International<![CDATA[]]>.

Distributed as-is; no warranty is given.