- On board LM1117-3.3 voltage regulator to power it from 5V (USB or other BUS);
- On board RS-485 Interface and place for ADM3072 or ADM485 in SOIC-8 (easy integrate to IoT or automotive devices);
- All pins out to 2.54mm and support breadboard (exclude GPIO16, what need for Deep-Sleep mode. For RTC Power you can just connect to it Battery 1.1V and internal RTC memory will work correctly.);
- On board Antenna selector (internal ceramic AN9520 or external via XW1 connector);
- On board "Power Led" and "User Led" (connected to GPIO5);
- Supporting Deep Sleep mode - RESET Pin connected to GPIO16 via resistor.
- Added all needed capacitors at VCC ESP8266 pins;
- Added resistors to SDIO bus (reducing EMI and current supply);
- Improved PCB routing (in compare with ESP-01, ESP-07 and etc.);
- Support auto-flash, just need conect UART to XP2 contacts and GPIO0 and Reset will automatically tougle when you will flash board.
Soldering ADM3072 or ADM485 :
- If soldered ADM485, you need install jumper JP1 (+5V power) and R8, R9 install like it wroted in BOM:
- If soldered ADM3072, you need install jumper JP3 (+3.3V power) and R8 install = 0 ohm, R9 = Do Not Install.
Pins RE and DE of RS-485 driver DD1 to VCC (GPIO4 is floating, when ESP8266 in flashing mode) and when ESP8266 flashing, driver will be work as transmitter, but receiver will be OFF (GPIO3 is left).
In attach - full project of PCB in Altium Designer + Generated Output Files in directory "_Outputs":
- File "3D Model.step" - 3D Model of PCB to use in SolidWorks or other CAD.
- File "BOM.xls" - Full BOM for soldering PCB with parctial Functional Analogs.
- File "Gerbers.zip" - just gerber-files.
- File "PCB 3D.PDF" - 3D Model in PDF! Open in Adobe Acrobat 10+ and you can view it like in Altium Designer!
- File "PCB.PDF" - 2D view of PCB with traces.
- File "Schematic.PDF" - just schematic.
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