Blynk Joystick Access

Once you have the basic robot working, you can scale up your projects.

The Blynk Joystick is a UI widget in the Blynk IoT platform (Legacy app) that allows users to control 2-axis movement (X and Y) from a smartphone. It is commonly used to remotely control robots, camera gimbals, pan-tilt servos, or any device requiring directional input.

Platform Note: This report primarily covers Blynk Legacy (Blynk v0.6.1) , as the new Blynk 2.0 (IoT platform) has a different widget set. A modern alternative in Blynk 2.0 is the "Analog Joystick" or "Control Pad".

Here is the complete code to map the Blynk joystick to a differential drive robot (tank steering).

#define BLYNK_TEMPLATE_ID "YourTemplateID"
#define BLYNK_DEVICE_NAME "YourDeviceName"
#define BLYNK_AUTH_TOKEN "YourAuthToken"
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
// WiFi Credentials
char ssid[] = "YourWiFiSSID";
char pass[] = "YourWiFiPassword"; blynk joystick
// Motor A (Left Side)
int motorA_en = D1;   // Enable pin (PWM Speed)
int motorA_in1 = D2;
int motorA_in2 = D3;
// Motor B (Right Side)
int motorB_en = D4;   // Enable pin (PWM Speed)
int motorB_in1 = D5;
int motorB_in2 = D6;
int xValue = 512; // Center default
int yValue = 512;
// This function runs whenever the app sends new joystick data
BLYNK_WRITE(V0)  // X Axis
xValue = param.asInt();

BLYNK_WRITE(V1)  // Y Axis
yValue = param.asInt();
 Once you have the basic robot working, you
void setup() 
Serial.begin(115200);
// Set motor pins as outputs
pinMode(motorA_en, OUTPUT);
pinMode(motorA_in1, OUTPUT);
pinMode(motorA_in2, OUTPUT);
pinMode(motorB_en, OUTPUT);
pinMode(motorB_in1, OUTPUT);
pinMode(motorB_in2, OUTPUT);
Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

void loop() 
Blynk.run();
controlRobot();

void controlRobot() 
// Map joystick (0-1023) to motor speed (-255 to 255)
// Center (512) = Stop
int mappedX = map(xValue, 0, 1023, -255, 255);
int mappedY = map(yValue, 0, 1023, -255, 255); BLYNK_WRITE(V1)  // Y Axis
yValue = param
int leftSpeed, rightSpeed;
// Differential Drive Logic
leftSpeed = mappedY + mappedX;
rightSpeed = mappedY - mappedX;
// Constrain values to PWM range
leftSpeed = constrain(leftSpeed, -255, 255);
rightSpeed = constrain(rightSpeed, -255, 255);
// Apply to Left Motor
setMotor(motorA_in1, motorA_in2, motorA_en, leftSpeed);
// Apply to Right Motor
setMotor(motorB_in1, motorB_in2, motorB_en, rightSpeed);

void setMotor(int in1, int in2, int en, int speed) 
if (speed >= 0) 
// Forward
digitalWrite(in1, HIGH);
digitalWrite(in2, LOW);
analogWrite(en, speed);
 else 
// Backward
digitalWrite(in1, LOW);
digitalWrite(in2, HIGH);
analogWrite(en, -speed);