![]() ![]() const int Button = 2 //Button is on Digital pin 2 volatile boolean Toggle //Introduce the controlling switch. ![]() int potpin = 0 // analog pin used to connect the Joystick int val // variable to read the value from the analog pin const int grnLEDpin = 12 //green LED is on Digital pin 12 const int redLEDpin = 13 //red LED is on Digital pin 13. LEDs are used to indicate theĬonst int address = 4 //The address for communications note that // this is one of the dedicated I2C connections. New uploads seeing as it is using Serial and I2C communication that This is included so that the sketch can be stopped to allow This sketch also includes an interrupt button to enable and disable The slave Arduino will take that information and This one is the master and will read a single channel fromĪnalogue pin 0, and send the data to a slave Arduino via the I2CĬommunication. Also, I don't know whether the device address is correct or not, since when I tried an I 2C scanner it didn't discover any device.Īlso, I hope that there is a similar method to have two-way UART communication between the Arduino and ESP as I found none since I need both chips to send data to each other.This sketch is one of two for sending information between twoĪrduinos. I connected pin 21 to A4 and 22 to A5 directly. ![]() function that executes whenever data is requested from master Serial.print(c) /* print the character */ Int c = Wire.read() /* receive byte as a character */ function that executes whenever data is received from master Serial.begin(9600) /* start serial for debug */ Wire.onRequest(requestEvent) /* register request event */ Wire.onReceive(receiveEvent) /* register receive event */ Wire.begin(8) /* join i2c bus with address 8 */ Wire.requestFrom(8, 18) /* request & read data of size 13 from slave */ Wire.endTransmission() /* stop transmitting */ Practically, you're never gonna reach 128 devices before other limitations kick in. The controller will send out information through the I2C bus to a 7-bit address, meaning that the technical limit of I2C devices on a single line is 128. Wire.begin(21, 22) /* join i2c bus with SDA=D1 and SCL=D2 of NodeMCU */ I2C lets you connect multiple I2C-compatible devices in series using only two pins. ![]() I want to send data between an ESP-32 (NODEMCU-32S) and an Arduino Uno but I haven't found any source on how to do that, so I tried this code: ![]()
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