// Forward/Backward value mapping int motorSpeedA = 0; int motorSpeedB = 0;
Some users report that joystick values are only received once instead of continuously. This typically occurs when the joystick widget isn’t configured to send continuous updates. In the joystick widget settings, ensure that the “Send On Release” option is disabled if you want continuous real-time updates.
For beginners learning real-time device control concepts, Blynk is the ideal starting point because results are immediately visible on a smartphone. For purely monitoring sensor data (e.g., temperature trends), ThingSpeak might be a better fit. For commercial multi-user applications, Firebase offers more robust user authentication.
: Represents vertical movement (forward to backward).
For advanced robotics enthusiasts, the joystick can be mapped to control a mecanum wheel robot—allowing diagonal movement, strafing, and rotation all from a single joystick interface.
A crucial note for developers: There are two versions of Blynk.
Let’s walk through setting up a complete joystick-controlled project using an ESP32 or NodeMCU board.
The Blynk Joystick is a virtual, 2-axis analog controller available within the Blynk IoT app (Legacy or Blynk 2.0). Unlike simple "Forward/Stop/Back" buttons, the joystick provides variable control. It mimics the behavior of a PlayStation or RC transmitter joystick, sending a range of values (typically from 0 to 255 or -100 to 100) for both the (horizontal) and the Y-axis (vertical).
Sending data continuously on every pixel movement can flood your microcontroller or hit Blynk rate limits. In the mobile app widget settings, switch the data sending mode from PWM / Continuous to a timed interval (such as 100ms ) if you encounter packet loss.
The joystick can be configured in several ways:
To process the "long piece" of data coming from the joystick, you use the BLYNK_WRITE function in your Arduino/ESP32 code. // Example for a Joystick on Virtual Pin V1 BLYNK_WRITE(V1) x = param[ ].asInt(); // Get X-axis value y = param[ ].asInt(); // Get Y-axis value // Example: Control motors based on X and Y Serial.print( ); Serial.print(x); Serial.print( ); Serial.println(y); Use code with caution. Copied to clipboard Essential Hardware & Resources ESP8266 Blynk Joystick Controlled Car IOT 9 Aug 2020 —
Represents horizontal movement (left to right).
#include <ESP8266WiFi.h> #include <BlynkSimpleEsp8266.h>