Arduino Software Serial Esp8266
I want to interface Arduino Uno and ESP8266 for IoT project where i have to control the device from webpage,but before that i wanted to check the above code for Arduino to ESP8266 by Serial Communication.So interfaced Arduino Uno with ESP8266 and powered ESP8266 with External adapter with 3.3V, ESP8266 baud rate is 115200 and in the code i. The open-source Arduino Software (IDE) makes it easy to write code and upload it to the board. It runs on Windows, Mac OS X, and Linux. The environment is written in Java and based on Processing and other open-source software. The SoftwareSerial library has been developed to allow serial communication on other digital pins of the Arduino, using software to replicate the functionality (hence the name 'SoftwareSerial '). It is possible to have multiple software serial ports with speeds up to 115200 bps.
I'm using Arduino Nano and ESP8266.
When I setup like the picture and connect Arduino Nano to PC by USB:
The ESP8266 properly works. (Arduino Nano is just used as a bridge)
I print and read from serial with a C# program, it correctly works.
What I send from C# program:
The message from ESP:
But, when I change the setup as follows:
- Green wire (green wire on picture) to Arduino Digital2 pin
- Red wire (red wire on picture) to Arduino Digital3 pin
- Use Arduino code to read/write serial, instead of C# program
- Create a software serial from code (esp8266 = SoftwareSerial(2, 3))
What I send from SoftwareSerial:
The message from ESP:
Do you have any ideas? Why isn't the result on SoftwareSerial identical to Serial?
Software Serial Keys
$endgroup$1 Answer
$begingroup$This is the info taken from arduino website:
The library has the following known limitations:
1) If using multiple software serial ports, only one can receive data at a time.
2) Not all pins on the Leonardo and Micro support change interrupts, so only the following can be used for RX: 8, 9, 10, 11, 14 (MISO), 15 (SCK), 16 (MOSI).
This has not explicitly mentioned the board you are using, but I think these limitations are on hardware level. Changing the software serial pins should most likely take care of this issue.
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