Blynk Joystick

// 3. Define your hardware pins for the motor driver int enA = 5; // Enable pin for Motor A's speed (PWM) int in1 = 4; // Motor A direction control 1 int in2 = 0; // Motor A direction control 2 int enB = 14; // Enable pin for Motor B's speed (PWM) int in3 = 12; // Motor B direction control 1 int in4 = 13; // Motor B direction control 2

Configuring to mirror your smartphone controls. Share public link

ESP32 NodeMCU or ESP8266 for native Wi-Fi connectivity.

// WiFi Credentials char ssid[] = "YourWiFiSSID"; char pass[] = "YourWiFiPassword"; blynk joystick

. The hardware receives two values: the X-coordinate and the Y-coordinate. A programmer then uses these values to calculate motor speeds or servo angles. For example, in a differential drive robot, the Y-axis might determine forward/backward speed, while the X-axis dictates the turning radius. Versatility and Customization

void loop() Blynk.run();

It differs from physical joysticks by eliminating hardware wiring and allowing for remote control over the internet, not just locally. // WiFi Credentials char ssid[] = "YourWiFiSSID"; char

Use the widget setting if real-time tracking isn't necessary, or handle high data rates with a reliable ESP32 development board. Implement a Safety Failsafe

: Keeps joystick directions aligned with the smartphone's orientation (portrait or landscape).

Set your value boundaries. For standard motor PWM speed control, mapping the ranges from -255 to 255 (or 0 to 1023 depending on your microcontroller's resolution) saves you from writing complex mapping functions later in your firmware. 💻 Arduino Firmware Implementation For example, in a differential drive robot, the

When you configure the Joystick widget, you assign it to one or two Virtual Pins. For instance, the X-axis value could be sent to Virtual Pin V0, and the Y-axis to Virtual Pin V1. In your Arduino code, you then "listen" for data on these Virtual Pins using a special function called BLYNK_WRITE(Vx) .

// Constrain the final motor speeds to be between -255 and 255. motorSpeedA = constrain(motorSpeedA, -255, 255); motorSpeedB = constrain(motorSpeedB, -255, 255);