Firmware Library

Arduino/C++ reference for the device-side library connected to a Plynx server.

Virtual Pins

Virtual pins are the main bridge between widgets and firmware. They do not map directly to physical GPIO and can carry numbers, strings, RGB triplets, table rows, and more.

// Read value from app widget on V0BLYNK_WRITE(V0) {  int value = param.asInt();  Serial.println(value);}

Timers

Avoid delay(). Use a cooperative timer so Blynk.run() keeps the connection responsive.

1234567891011BlynkTimer timer;void setup() {  Blynk.begin(PLYNX_AUTH_TOKEN, ssid, pass, "plynx.cc", 8080);  timer.setInterval(1000L, sendSensor);}void loop() {  Blynk.run();  timer.run();}

Server targets

Use the public host or the same exact firmware against a private edge instance.

// Public hostBlynk.begin(PLYNX_AUTH_TOKEN, ssid, pass, "plynx.cc", 8080);

RGB merge mode

zeRGBa can drive a 3-channel LED strip in a single widget.

123456789101112#define RED_PIN   D5#define GREEN_PIN D6#define BLUE_PIN  D7BLYNK_WRITE(V2) {  int r = param[0].asInt();  int g = param[1].asInt();  int b = param[2].asInt();  analogWrite(RED_PIN, r);  analogWrite(GREEN_PIN, g);  analogWrite(BLUE_PIN, b);}