![]() ![]() Tact switch of Arduino Uno is pressed (background) > Yellow LED of Arduino Nano is switched on. If everything has been executed correctly, an Arduino’s LED is switched on, if the tact switch of the other Arduino has been pressed. The source code has to be transferred to both Arduinos (= both Arduinos have the same very same code). Therefore, inverted status is sent to other Arduinoĭelay(250) // delay required to avoid flooding the other Arduino ("DoS attack") Sserial.write(!digitalRead(IN_TACT_SWITCH)) // Tact switch (used in the corresponding tutorial) is inverted. Sserial.begin(9600) // start serial connectionĭigitalWrite(OUT_LED, incomingByte) // switch LED on or off PinMode(OUT_LED, OUTPUT) // set the LED pin to output mode PinMode(IN_TACT_SWITCH, INPUT_PULLUP) // set the LED pin to input pullup mode SoftwareSerial sserial(10,11) // receive pin=10, transmit pin=11 * This program has to be transferred to both Arduinos in order to make the application work.Ĭonst int IN_TACT_SWITCH = 2 // input pin for tactile switchĬonst int OUT_LED = 3 // output pin for LED If the switch is pressed, an LED is turned on. * The status of a tact switch is sent to the other Arduino. ![]() * This program is part of a tutorial that shows how to communicate from an Arduino to another Arduino via a serial connection. At the end of the loop function, a delay of 250ms is added. ‘0’ is sent to the other Arduino, if the tact switch if not pressed. Next, the current status of the tact switch is sent. The digital output is set to the received byte: Either ‘0’/false to turn off the LED or ‘1’/true to turn it on. In the loop function, it is checked whether a byte was received from the serial connection. Nonetheless, it has been added to the wiring diagram for the sake of completeness.įirst, the pins for the tact switch (INPUT_PULLUP) and LED (OUTPUT) are set up. as both Arduinos probably share the same GND signal when powered from the same power supply. In order to make the serial connection work, the receive wire of one Arduino is connected to the transmit wire of the other Arduino. The transmit wire is connected to digital pin #11. The receive wire is connected to digital pin #10. The serial connection requires three wires: for GND, receive and transmit. The LED is wired to GND and the 1k resistor. The tact switch is wired to GND and two digital pin #2. ![]() Both Arduino setups have the basically the same wiring: a tact switch, an LED and a 1k resistor is added to a breaboard. ![]()
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