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ESP8266 Custom Board

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fossil:
I have been watching this wonderful forum for many years. I could say, this forum has given me courage to consider the following project.

I am looking forward to build a standalone custom ESP8266 board based on ESP-WROOM. This exercise is purely for academic purpose. I want to learn how to use a wireless chip instead of module. If you are wondering why ESP8266, I have been given few dozen ESP8266EX, purchased as samples from Espressif, by a friend of mine.

The spec I am considering

* 8MB Flash
* DC/DC Converter 3-14V Input 5V/1A Running at 2250MHz
* 3.3V LDO powering the ESP8266EX
* External antennaI want this board to work with any power source as long as voltage is less than 14V. I am aware of challenges of designing DC/DC converter. I intend to use the PCB design from TI WEBENCH. Further, I have read the ESP8266 hardware design guidelines document. The board will be 4 layers as suggested in hardware guidelines.

I have soldering station, hot-air, 50MHz oscilloscope. I am looking forward to build a toaster reflow oven soon.

I am wondering what problems are in store for me?

JoeO:
Go to youtube and search "reflow toaster oven".

There are many videos there that can give you the information that you want.

fossil:

--- Quote from: JoeO on January 19, 2019, 03:52:34 am ---Go to youtube and search "reflow toaster oven".

There are many videos there that can give you the information that you want.

--- End quote ---

I do have a controller board for toaster oven. I am planning to build next weekend.

I am looking for advice on building standalone esp8266 board.

128ITSH:
With what part of the board are you struggling? What you want to do is very achievable. Like you said the main challenge I see here is designing the power supply circuitry as efficient as possible. The 8MB flash probably has simple connections to the chip. A thing worth to consider is protecting the Wi-Fi Antenna traces from the switching noise of the power supply. Could be done by putting each on a different side of the board and even using metals to enclose the switching supply. Not so sure about this so look for it online.

fossil:

--- Quote from: 128ITSH on January 20, 2019, 04:38:58 pm ---With what part of the board are you struggling?

--- End quote ---
I can't say I am struggling. As of now, I am almost done with schematic. I am trying to find out if there any other things to watch out for.


--- Quote from: 128ITSH on January 20, 2019, 04:38:58 pm ---The 8MB flash probably has simple connections to the chip. A thing worth to consider is protecting the Wi-Fi Antenna traces from the switching noise of the power supply. Could be done by putting each on a different side of the board and even using metals to enclose the switching supply. Not so sure about this so look for it online.

--- End quote ---
I am considering to shield the power supply.  Probably, I will also try to shield the wireless chip and analog section as seen in other modules

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