Hi.
Im very new to Blynk but loving it so far. In a very short time my projects have come on leaps and bounds.
I have created a relay controller and temperature monitor on an ESP8266 - NodeMCU.
Here is the code, I have commented it as best I can:
/**************************************************************
* Blynk is a platform with iOS and Android apps to control
* Arduino, Raspberry Pi and the likes over the Internet.
* You can easily build graphic interfaces for all your
* projects by simply dragging and dropping widgets.
*
* Downloads, docs, tutorials: http://www.blynk.cc
* Blynk community: http://community.blynk.cc
* Social networks: http://www.fb.com/blynkapp
* http://twitter.com/blynk_app
*
* Blynk library is licensed under MIT license
* This example code is in public domain.
*
**************************************************************
* This example runs directly on ESP8266 chip.
*
* Note: This requires ESP8266 support package:
* https://github.com/esp8266/Arduino
*
* Please be sure to select the right ESP8266 module
* in the Tools -> Board menu!
*
* Change WiFi ssid, pass, and Blynk auth token to run :)
*
**************************************************************
* Hardware:
* NodeMCU Module with ESP8266-10E.
* TMP36 Temperature Sensor on Pin A0.
* 4 Channel Relay Board connected to Pins D0, D1, D2 & D5.
*
**************************************************************/
#define BLYNK_PRINT Serial // Define Blynk serial debugging.
#include <ESP8266WiFi.h> // Include library.
#include <BlynkSimpleEsp8266.h> // Include library.
#include <SimpleTimer.h> // Include library.
WidgetTerminal terminal(V9); // Create instance of Terminal Widget.
#define D0 16 // Define the the GPIO pin to a Digital pin.
#define D1 5 // I2C Bus SCL (clock) // Define the the GPIO pin to a Digital pin.
#define D2 4 // I2C Bus SDA (data) // Define the the GPIO pin to a Digital pin.
#define D5 14 // SPI Bus SCK (clock) // Define the the GPIO pin to a Digital pin.
#define RELAY1_PIN D0 // D0 // Define the relay pin.
#define RELAY2_PIN D1 // D1 // Define the relay pin.
#define RELAY3_PIN D2 // D0 // Define the relay pin.
#define RELAY4_PIN D5 // D1 // Define the relay pin.
char auth[] = "ff1ccbb2e1444ea5b53b92d8a860c0a5"; // Blynk authorisation code.
bool isFirstConnect = true; // Keep this flag not to re-sync on every reconnection.
BLYNK_CONNECTED() { // This function will run every time Blynk connection is established.
if (isFirstConnect) { // Check if first connection.
Blynk.syncAll(); // Request Blynk server to re-send latest values for all pins.
isFirstConnect = false; // Store first connect value as low.
} // End of if statement.
} // End of Blynk Connected.
char ssid[] = "NetworkX7"; // Name of WiFi network.
char pass[] = "colaboy74"; // WiFi netork password.
SimpleTimer timer; // Create an instance of the simple timer.
BLYNK_WRITE(1) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY1_PIN, HIGH); // Drive relay pin high.
} // End of if statement.
else { // Else statement to check incomming data.
digitalWrite(RELAY1_PIN, LOW); // Drive relay pin low.
} // End of else statement.
} // End of Blynk Write.
BLYNK_WRITE(2) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY2_PIN, HIGH); // Drive relay pin high.
} // End of if statement.
else { // Else statement to check incomming data.
digitalWrite(RELAY2_PIN, LOW); // Drive relay pin low.
} // End of else statement.
} // End of Blynk Write.
BLYNK_WRITE(3) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY3_PIN, HIGH); // Drive relay pin high.
} // End of if statement.
else { // Else statement to check incomming data.
digitalWrite(RELAY3_PIN, LOW); // Drive relay pin low.
} // End of else statement.
} // End of Blynk Write.
BLYNK_WRITE(4) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY4_PIN, HIGH); // Drive relay pin high.
} // End of if statement.
else { // Else statement to check incomming data.
digitalWrite(RELAY4_PIN, LOW); // Drive relay pin low.
} // End of else statement.
} // End of Blynk Write.
BLYNK_WRITE(5) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY1_PIN, HIGH); // Drive relay pin high.
digitalWrite(RELAY2_PIN, HIGH); // Drive relay pin high.
digitalWrite(RELAY3_PIN, HIGH); // Drive relay pin high.
digitalWrite(RELAY4_PIN, HIGH); // Drive relay pin high.
} // End of if statement.
} // End of Blynk Write.
BLYNK_WRITE(6) { // Receive data from app.
if (param.asInt()) { // If statement to check incomming data.
digitalWrite(RELAY1_PIN, LOW); // Drive relay pin low.
digitalWrite(RELAY2_PIN, LOW); // Drive relay pin low.
digitalWrite(RELAY3_PIN, LOW); // Drive relay pin low.
digitalWrite(RELAY4_PIN, LOW); // Drive relay pin low.
} // End of if statement.
} // End of Blynk Write.
BLYNK_WRITE(9) { // Receive data from app.
if (String("help") == param.asStr()) { // If statement to check incomming data.
terminal.println("Commands Available:"); // Terminal print.
terminal.println("Hardware"); // Terminal print.
terminal.println("Network"); // Terminal print.
terminal.println("status"); // Terminal print.
terminal.println("Uptime"); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
if (String("hardware") == param.asStr()) { // If statement to check incomming data.
terminal.println("Hardware:"); // Terminal print.
terminal.println("NodeMCU - ESP8266-10F"); // Terminal print.
terminal.println("TMP36 Temperature Sensor (A0)"); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
if (String("network") == param.asStr()) { // If statement to check incomming data.
terminal.print("WiFi Netork: "); // Terminal print.
terminal.println(WiFi.SSID()); // Terminal print.
terminal.print("Local IP Address: "); // Terminal print.
terminal.println(WiFi.localIP()); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
if (String("status") == param.asStr()) { // If statement to check incomming data.
terminal.print("Relay 1: "); // Terminal print.
terminal.println(digitalRead(RELAY1_PIN)); // Terminal print.
terminal.print("Relay 2: "); // Terminal print.
terminal.println(digitalRead(RELAY2_PIN)); // Terminal print.
terminal.print("Relay 3: "); // Terminal print.
terminal.println(digitalRead(RELAY3_PIN)); // Terminal print.
terminal.print("Relay 4: "); // Terminal print.
terminal.println(digitalRead(RELAY4_PIN)); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
if (String("uptime") == param.asStr()) { // If statement to check incomming data.
terminal.print("Uptime: "); // Terminal print.
terminal.print(millis() / 60000); // Terminal print.
terminal.println(" Minutes"); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
} // End of Blynk Write.
void sendSensorFive() { // Start of sendSensorFive Void.
int sensorValue = analogRead(A0); // Read analog pin.
float volt = (sensorValue / 1024.0) * 3.3; // Temperature conversion.
int tempC = (volt - 0.5) * 100; // Temperature conversion.
Blynk.virtualWrite(V0, tempC); // Write temperature data to the app.
} // End of sendSensorFive Void.
void sendSensorThirty() { // Start of sendSensorThirty Void.
int sensorValue = analogRead(A0); // Read analog pin.
float volt = (sensorValue / 1024.0) * 3.3; // Temperature conversion.
int tempC = (volt - 0.5) * 100; // Temperature conversion.
Blynk.virtualWrite(V7, tempC); // Write temperature data to the app.
} // End of sendSensorThirty Void.
void sendSensorSixty() { // Start of sendSensorSixty Void.
int mins = millis() / 60000; // Convert millis to minutes.
Blynk.virtualWrite(V8, mins); // Write minutes to the app.
} // End of sendSensorSixty Void.
void setup() { // Start of Setup Void.
Serial.begin(9600); // Start the serial protocol.
Blynk.begin(auth, ssid, pass); // Begin the Blynk protocol.
timer.setInterval(5000L, sendSensorFive); // Timer to trigger a void.
timer.setInterval(30000L, sendSensorThirty); // Timer to trigger a void.
timer.setInterval(30000L, sendSensorSixty); // Timer to trigger a void.
pinMode(RELAY1_PIN,OUTPUT); // Setup the pin as an output.
pinMode(RELAY2_PIN,OUTPUT); // Setup the pin as an output.
pinMode(RELAY3_PIN,OUTPUT); // Setup the pin as an output.
pinMode(RELAY4_PIN,OUTPUT); // Setup the pin as an output.
digitalWrite(RELAY1_PIN, LOW); // Drive the pin low.
digitalWrite(RELAY2_PIN, LOW); // Drive the pin low.
digitalWrite(RELAY3_PIN, LOW); // Drive the pin low.
digitalWrite(RELAY4_PIN, LOW); // Drive the pin low.
} // End of Setup Void.
void loop() { // Start of the Loop Void.
Blynk.run(); // Run the Blynk library code.
timer.run(); // Run the Timer library code.
} // End of the Loop Void.
The code works great and very nearly does everything I want it to.
I just have a small question though.
In the code snippet below, I can input something in the Terminal Widget which will then return some data.
BLYNK_WRITE(9) { // Receive data from app.
if (String("help") == param.asStr()) { // If statement to check incomming data.
terminal.println("Commands Available:"); // Terminal print.
terminal.println("Hardware"); // Terminal print.
terminal.println("Network"); // Terminal print.
terminal.println("status"); // Terminal print.
terminal.println("Uptime"); // Terminal print.
terminal.flush(); // Ensure terminal print has completed.
} // End of if statement.
}
The code is searching for a specific string so it has to be case sensitive. Is there any way that I could make it search for either “help” or “Help”?
Thanks in advance for any help.
Colaboy.