Slaves Mac Addresses that will receive data from the Master the gpios array total size, everything will be calculated automatically so we don't need to change this variable everytime we change In the setup function we'll calculate the gpio count and put in this variable, It's important that the Slave source code has this same array Gpios that we are going to read (digitalRead) and send to the Slaves We still work with the MAC Address of the slaves to which we will send the reading. In the Setup part, we will calculate the number of pins and put in this variable, so we won’t need to change every time we change the number of pins. It is important to highlight that the source code of Slaves has this same array with the same GPIOs. Let's define the channel for connection and the pins that will be read, as well as the data that will be sent to Slaves. Here, we will work with the libraries ESP_NOW.h and WiFi.h. In the serial print of Setup, both the sending and the receiving code contain the MAC address values of each of the chips involved. In this scheme, it is still possible to see that we practically don’t have Boot time, because when the ESP is switched off and reconnected, the operation resumes immediately. I copied the code that sends to the Master, and this one also sends the Broadcast to the others. In this example, I compiled the same receiver for all microcontrollers. Why does this occur? Because the moment the Master sends the information to the station, it is sending a MAC address of Broadcast, which means that everyone on the network receives the data at the same time. When this button is pressed, a LED lights up in this microcontroller, and all four other ESPs32 instantly restart the action. However, to facilitate the identification, I point to this first ESP as Master, in which I set up a button in the GPIO02. It is important to remember that there is no Master device, and that they all function as Stations. Void Serialprintln(const char* input.) Ĭase 's': Serial.print(va_arg(args, char*)) break Ĭase 'd': Serial.print(va_arg(args, int), DEC) break Ĭase 'b': Serial.print(va_arg(args, int), BIN) break Ĭase 'o': Serial.print(va_arg(args, int), OCT) break Ĭase 'x': Serial.print(va_arg(args, int), HEX) break Ĭase 'f': Serial.In our assembly, we have an ESP32 isolated, which is configured as Master. You can use stdarg.h to create one-liner with Serial.prints: #include Option 1 is most effective, since it directly prints arguments to the output char by char (see Arduino Print class) and traverses the arguments only once. Option 2 creates object from string, then applies + operator to create a new string, then prints it - it is comfortable with short strings, but least efficient (depends on the compiler optimalizations). The other problem is that first you build the string, then you print the output, the program traverses the string twice. The wrong thig with option 3 is the buffer length, you should use snprintf instead. Other classes in the library are BufferedPrint and ChunkedPrint. Sb.print("this text doesn't fit in the remaining space in the buffer") It is available in StreamLib in library manager. It enables to build the c-string with printf and with Print functions, which can print float or IPAddress. I created a simple CStringBuilder class to combine the first and third approach mentioned in your question.
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