How to make wifi based version (Esp8266)

Michal edited this page Jul 24, 2018 · 7 revisions

1. Get/assemble the hardware. Check spacehuhn's wifi_ducky or Seytonic's video about it to see how to do that. Different boards/modules can be used for it, but the hardware must have:

A board with Atmega32U4 such as:

  • Arduino Pro Micro 5V (with external 3.3V regulator or two 3.6V zener diodes)
  • Arduino Pro Micro 3.3V (requires Sparkfun plugin)
  • CJMCU Beetle (with external 3.3V regulator or two 3.6V zener diodes)
  • SS Micro
  • Arduino Leonardo

A board with Esp8266 module such as:

  • Esp8266 12-F
  • NodeMCU (most of the steps listed below are not applying to it because it can be flashed much more easily, all you have to do with is to upload Esp8266.ino to it using Arduino IDE, there are many guides on how to do that)
  • Wemos D1 Mini (also can be programmed directly through its micro USB socket)

Both modules (Atmega32U4 + Esp8266) should be connected together as shown in the wifi_ducky project.

wiring image

The image below shows how two 3.6V zener diodes can be used instead of voltage regulator (they go from 5V pin of CJMCU into VCC of Esp that expects 3.3V).

Btw lack of isolation on the image below is bad practice (heatshrink tubes could be used). It also has 2 resistors that are not used in Seytonic's video but I added them because of wiring diagram found online (I guess CH_PD resistor allows to reset the board by connecting it to GND, without the resistor it would be also directly connected with VCC).

wiring image zener diodes

Make sure that the GPIO 0 pin of Esp8266 is connected to ground, it is necessary to flash Esp8266 with new code, after the flashing/programming process is done it should be disconnected.

gpio0 image

Possibly the following steps of this guide could work with WHID (as long as GPIO 0 is connected to ground) but I didn't test it so I'm not sure.

2. Upload the code below to your chosen Atmega32U4 board using Arduino IDE:

// taken from: https://gist.github.com/spacehuhn/b2b7d897550bc07b26da8464fa7f4b36

void setup()
{
  Serial1.begin(115200);
  Serial.begin(115200);
}

void loop()
{
  while(Serial1.available()){
    Serial.write((uint8_t)Serial1.read());
  }

  if(Serial.available()){
    while(Serial.available()){
      Serial1.write((uint8_t)Serial.read());
    }
  }
} 

Choose Tools -> Board -> Arduino Leonardo (for all boards except Arduino Pro Micro 3.3V which requires Sparkfun plugin)

3. Download Esp8266Flasher program (32-bit, 64-bit).

The code uploaded in step 2 will make sure that the Esp8266 code uploaded using this program will reach Esp8266 even that it's not directly connected to PC (it's connected through the board with Atmega32U4).

4. Open the Esp8266Flasher program, load this bin file and flash it.

Pick the COM port corresponding to the connected device.
Press Config and click on the cog icon to load the file, check the corresponding checkbox and uncheck others. Use 0x00000 offset.
Press Advanced and select 115200 Baudrate, 4MByte Flash size, 80MHz Flash speed and DIO SPI Mode.
Press Operation and finally press Flash(F)

5. Open the main supremeDuck code in Arduino IDE, uncomment line shown below and upload the code.

The line to uncomment is:

//#define WIFI_DUCKY_SETUP

It should look like this after uncommenting:

#define WIFI_DUCKY_SETUP

Pick Tools -> Boards -> Arduino Leonardo (exception for Arduino Pro Micro 3.3V)

6. Disconnect GPIO 0 (Esp8266) from ground.

The whole process is slightly complicated so I tried to keep it as simple as possible but there are few ways it could be done in more convenient way. For example:

  • a switch between GPIO 0 and ground could be used (like this but possibly with thinner cables)
  • as shown in the esp flasher code here digital output pins could be used to determine GPIO 0 state, this would require more wiring work but would save time attaching/detaching GPIO 0 to GND over and over again.

7. The device should be in working order now.

You could check this video to see how to use it instead of the initial bluetooth version. Please let me know on discord (michalmonday#3687) if you encounter any problems while following this guide.

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