Blynk mobile development for Arduino - Updated for Blynk 2

Learn to build a demo blink app with two ESP32 devices, OTA updates, and cloud and mobile dashboards, widgets, and templates to visualize and control remote data.

Create a new Blynk account using the mobile app or cloud console, sign up with your email, and complete verification via the Blink app on Android or iOS or website.

Manage Blink templates and devices, enable developer mode, and configure data streams with virtual pins to map to gpio, ensuring cloud and smartphone app synchronization.

Program an ESP32 using the Blink library in Arduino IDE, linking a virtual pin zero to GPIO 23 to control a device from a mobile dashboard.

Create an actual state data stream with an LCD widget on the dashboard and send the state via virtual pin v1, updating the label color from white to red.

Add a random number datastream in Blynk for Arduino using the library timer to generate numbers between zero and 300 every second, and push them to mobile and web dashboards.

Add a second led control widget in Blynk 2 by creating a new data stream (v3) for GPIO 22 and wiring a corresponding switch on the web and mobile dashboards.

Learn to add a logger by creating a new Blink log event, sending a name and optional value to the cloud. View events in the device timeline and enable notifications.

Enable over-the-air firmware updates for ESP32 using the edge lit library and provisioning, migrating to the agent library for secure OTA with an Arduino sketch.

Convert the demo app to firmware over the air by cloning a cloud template and adapting the device template for the hospitality device, enabling OTA updates.

Upload the new Edgent firmware to the device and configure its wifi credentials via the Arduino IDE. Demonstrate over-the-air updates, onboard via a temporary wifi hotspot, and dashboard setup.

Demonstrates over-the-air firmware updates with blink cloud, incrementing firmware version, exporting a bin, shipping updates to devices via the blink console, and observing random data every two seconds.

Learn to use the public Blynk server with a Nano 33 IoT and an ESP32, control led and brightness with widgets, and migrate between devices without reflashing.

Discover the Arduino Nano 33 IoT's compact form, accelerometer, and wifi via the UpLink Nina W102 module; install Blinkx libraries and set up the board in the Arduino IDE.

Install the Blink app from the App Store or Google Play, create your account, and learn that your apps are stored on the server for easy migration between devices.

Create a new blank Blynk app project, link your account, and use the emailed authentication token to connect an Arduino via wifi to the blink cloud.

Learn to use virtual pins in Blynk to send values from the mobile app to an Arduino sketch, using a slider to control an 8-bit analog write on pin 2.

Replace the Arduino Nano 33 IoT with an ESP32 by rewiring, adjusting pins, and updating the sketch and libraries to preserve Blink app functionality.

Explore a dual-device Blynk project by integrating the Arduino Nano 33 IoT and ESP32 into a single app, demonstrating multi-device control across two app tabs.

Set up a new Blynk project to control two devices, configure wifi and authentication token, and map a button and a slider to digital pins 13 and 2.

Retrieve the new authentication tokens from application emails for two devices, paste them into their sketches, select the correct boards and ports, upload the sketches, and run a quick test.

Demonstrate dual-device setup in a Blynk 2 project by connecting two devices and testing virtual pins. Explore energy balance, widgets, and the advantages of a private server for lower latency.

Compare the legacy and new blink platforms, noting that widgets and virtual pins work similarly, while differences are mainly behind the scenes; authentication tokens, wifi, and api remain consistent.

Discover how Blynk basic vs pro widgets differ, highlighting free tier limitations, basic widgets available, and pro widgets in the plus plan, with free tier suitable for most examples.

Conduct a series of Blynk experiments on a single link widget using an Arduino Nano 33 IoT and digital pin 2, reusing application token to connect to phone app.

Explore how virtual pins extend the Blynk platform beyond analog and digital pins, using display widgets to show values and transfer data between the app and hardware via virtual pin zero.

Master Blynk 2 by implementing normal and styled buttons for Arduino projects, exploring push button and switch behavior, customization options like size, shape, color, and mapping to digital pins.

Explore how a hardware button drives a Blynk widget on an Arduino project, using a virtual pin, internal pull-up, and in-between states via a P value.

Learn to read a potentiometer value, scale it to a pwm range, and drive both a hardware led and a simulated widget in blink using an arduino nano.

Learn to use horizontal and vertical sliders in blink to control a digital pin, have widgets read each other's values, and update graphics in real time.

Explore vertical and horizontal step controls in Blynk for Arduino, configuring step size and a 0–255 range. Send steps or set values, customize icons, and observe brightness changes.

Control multiple servo motors with a joystick in Blynk 2 using split and merge modes, wiring servos to an Arduino Nano with external power and shared grounds.

Learn to use the zeRGBa color picker widget to send red, green, and blue values to an Arduino, exploring split mode and merge mode, wiring LEDs and updating sketches.

Learn to use the Blynk time widget to schedule Arduino digital pin control based on server time. Turn devices on or off at set moments and create alarms.

Learn to use the lcd widget in simple mode to display celsius and fahrenheit readings from the mcp9808 precision temperature sensor on an arduino, with a one-second update via blink.

Practice advanced lcd widget usage by linking to virtual pin zero, printing temperature in celsius and fahrenheit with precise coordinates, and updating display every 1000 milliseconds in an Arduino sketch.

Demonstrate displaying temperature data with Blynk using the regular value display and the labeled value display, format the label, and push updates from a virtual pin on Arduino.

Explore superchart in Blynk for Arduino, generating live line charts from sensor data and multiple streams, with historical views, time frames, and export options for analysis.

Learn to configure a gauge widget in Blynk 2 for Arduino, choosing between pull and push data via virtual pins, using analog read from a potentiometer.

Display data from the accelerometer in a three-gauge setup using virtual pins, showing IMU readings on a mobile app with push refresh for real-time visualization.

Visualize accelerometer data with Blynk 2 level widgets, using a vertical layout to display the z-axis on virtual pin 3; configure -2 to 2 g range and updates via push.

Learn to use the Blink terminal in receive mode to display device output and later send text back; connect to a virtual pin and stream sensor data every second.

Use the Blynk terminal and its input line to send commands like temp c or temp f to an arduino, then read celsius or fahrenheit temperatures wirelessly.

Explore sending email notifications from an Arduino with blink, constructing subject and body using variables, and triggering via a button or sensor for device monitoring.

Learn to send smartphone push notifications with Blynk by triggering them from a virtual pin and displaying the temperature from the MCP9808.

Install, configure, and use a private Blinkx server on a Raspberry Pi Zero W. Explore accessing the server from the internet, managing authentication tokens, and running a simple led project.

Flash the Raspberry Pi OS lite on a class 10 sd card with the Raspberry Pi Imager, enable SSH, and configure Wi-Fi for headless setup.

Boot the Raspberry Pi, locate its IP with a network scanner, SSH in as pi, fix the host key, and use raspi-config to change the hostname and expand the filesystem.

Reallocate memory to the Raspberry Pi OS CPU for the Raspberry Pi Zero (16 MB), use Zeren to disable swap and compress RAM, and disable HDMI for headless operation.

Install the Blynk server on Raspberry Pi by installing Java, downloading the jar, and running it with a data directory; first boot creates an admin user on port 9443.

Create a new Blynk project on a private server, obtain and transfer the authentication token to your sketch, and test connectivity with the private server.

Configure a private Blynk server and enable automatic startup on Raspberry Pi, email notifications, external access, and self-signed certificates, using server properties and templated config files.

Configure autostart for the blink private server on the Raspberry Pi using a startup script and reboot testing; verify the server runs, connects, and stays auto-started after reboot.

Configure the Blinkx server to send email notifications by adding a mail properties file, using a dedicated Gmail account, restarting the server, and verifying authentication tokens arrive via email.

Learn to create and configure self-signed certificates with OpenSSL, generate the server key and crt, and update the Blinkx private server settings for secure connections.

Set up your router to forward external port 9443 to your internal Raspberry Pi running the Blynk server, enabling internet access via the public IP and testing over mobile data.

Explore how to customize your Blinkx server by editing the server properties file, including port settings, data folder path, SSL certificates, logs level, and user message limits.