In the typical configuration, the 8-bit ATMega2560 CPU operates at 16mhz and serves as the primary CPU. On this particular Arduino board, there are two CPUs. This is for convenience in editing the webserver code. The project also contains a C# utility program to convert an HTML file to a C style string. Both must be uploaded to the board because both work together. This project contains the Arduino IDE project ino files for both the ESP8266 demo code and the ATMega2560 demo code. With this article, I aim to show you how to tap the more powerful CPU and delegate to the less powerful CPU for I/O. It's so much more capable in fact, that even while handling the TCP/IP stack, it still has enough cycles left over to outperform the Mega. In that article, I alluded to the fact that the onboard WiFi has its own CPU and that this CPU is significantly more powerful than the main ATMega2560 CPU on the Arduino board. Recently, I published a brief article here on getting started with the Arduino Mega 2560+WiFi R3. I've also read, but have not verified that there's a very limited number of times you can flash some of the more cheaply made ESP-01s so there is some risk but I don't think that's necessarily true for these Arduino and derivative boards. Once you overwrite, it is possible, but not easy to put back to factory, and the default library for communicating with this module "WiFiEsp" will no longer work with it. The development was based on a clone of the CYT1076 which is green in color.Disclaimer: This process will overwrite the default firmware that ships with the WiFi module on this board. RXD to Level Converter's LV4 (white wire)Ī word abut the Fritzing symbol of level converter: Sparkfun BOB-12009 was used in preparing for the breadboard diagram.TXD to Level Converter's LV3 (blue wire).Ground to Ground power strip (black wire).LV to Mega2560's +3.3V power strip(orange wire).HV to Mega2560's +5V power strip(red wire).Ground to Ground power strip(black wire).Cylewet CYT1076 compatible Logic Level Converter (or Sparkfun BOB-12009). RX1 (19) to Level Converter's HV3 (white wire).TX1 (18) to Level Converter's HV4 (blue wire).+3.3V to breadboard lower power strip (orange wire).+5V to breadboard upper power strip (red wire).Connect Ground to breadboard upper and lower Ground power strips (black wires recommended).Please follow the breadboard diagram for circuit connection: Thanks to my dear parents (may them rest in peace) for giving me all the support, love, and freedom throughout the years. Martyn Currey, for sharing his vast knowledge on the HC-06 and more. for bringing the HC-06 to the world to Mr. Special thank goes to Guangzhou IT Information Technology Co., Ltd. Thanks also go to authors everywhere who unselfishly shared their experience and wisdom. Thanks to members of Instructables and Arduino community, your participation are always greatly appreciated. A table of supported AT commands, plus the expected response from the HC-06.Various screen displays the Mega 256 provides for interactive operation, and.It will help identify the set baud rate and parity of the HC-06, brand-new or used.It is a Mega2560 based sketch offering interactive operating environment.One of the easiest ones is a Windows app from the originator of HC-06. These parameters can be modified by sending various "AT" commands to the HC-06, manually or automatically. The HC-06 is an inexpensive Bluetooth slave module. So, please make sure that the red LED near the 4 pin jumper stays flashing. (230400 was listed as an choice under Arduino IDE's Serial Monitor, but it was not an reliable baud rate to work with HC-06)Ĭritical Reminder: The HC-06 must NOT connect to any master device. 2 AT command set.Īlthough the baud rate of HC-06 could go up to 1382400, this sketch only supports up to 115200 due to the limitation on Arduino IDE. This sketch is designed to work with HC-06 modules which support the official Rev. In addition, you must feel comfortable placing components and wires on a breadboard. To complete this project, you must feel comfortable downloading the sketch, opening it within the Arduino IDE, compiling and uploading code to your Arduino Mega 2560, then communicating with the sketch via the Serial Monitor.
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