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• Hardware model + communication type. For example: Arduino UNO with Ethernet Shield
• Smartphone OS (iOS or Android) + version
• Blynk server or local server
• Blynk Library version
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void loop()
My query is for a simple plant watering system automation using ESP32 micro-controller, I’m trying to use Lcd display, relay, water pump, and soil moisture sensor. In Lcd display I can able to see the moisture value but the same is not reflecting on mobile and web dashboard of Blynk IOT app. I tried to connect everything under same Wi-fi network, still not able to notice any variation in mobile app. what could be the problem?
Impossible to say without at the very least seeing your sketch. Info about datastreams, widgets used, whether your device appears online etch etc would also be useful.
Don’t forget to follow the instructions that you didn’t delete when making your first post about code formatting.
@Loga Please edit your post, using the pencil icon at the bottom, and add triple backticks at the beginning and end of your code so that it displays correctly.
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Any reason why you left your u formatted code in place and added a new post with it correctly formatted, instead of editing your earlier post?
The screenshot you posted shows the Template view, which is simply a preview of the web dashboard with dummy data,
You need to go to the Device view (magnifying glass at the top left) to see the real dashboard.
You need to remove these two lines from your void loop…
and use a BlynkTimer to call your soilMoisture function, but I suspect that doing this every 200ms is a bit of an overkill.
#define BLYNK_TEMPLATE_ID "****"
#define BLYNK_TEMPLATE_NAME "****"
#define BLYNK_AUTH_TOKEN "*****"
//Include the library files
#include <LiquidCrystal_I2C.h>
#include <SimpleTimer.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>
#define sensor 33
#define relay 4
//Initialize the LCD display
LiquidCrystal_I2C lcd(0x27, 16, 2);
BlynkTimer timer;
// Enter your Auth token
char auth[] = "******";
//Enter your WIFI SSID and password
char ssid[] = "****";
char pass[] = "*****";
void measureSoilMoisture() {
soilMoisture(); // Call your soilMoisture function here
}
void setup() {
// Debug console
Serial.begin(115200);
Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);
lcd.init();
lcd.backlight();
pinMode(relay, OUTPUT);
digitalWrite(relay, HIGH);
timer.setInterval(5000, measureSoilMoisture);
lcd.setCursor(1, 0);
lcd.print("System Loading");
for (int a = 0; a <= 15; a++) {
lcd.setCursor(a, 1);
lcd.print(".");
delay(200);
}
lcd.clear();
}
//Get the soilMoisture sensor values
void soilMoisture() {
int value = analogRead(sensor);
value = map(value, 4095,0,100,0);
value = (value - 74) * 1;
if (value<0)
{
value=-value;
}
Blynk.virtualWrite(V0, value);
Serial.println(value);
lcd.setCursor(0, 0);
lcd.print("Moisture :");
lcd.print(value);
lcd.print(" ");
}
//Get the button value
BLYNK_WRITE(V1) {
bool Relay = param.asInt();
if (Relay == 1) {
digitalWrite(relay, LOW);
lcd.setCursor(0, 1);
lcd.print("Motor is ON ");
} else {
digitalWrite(relay, HIGH);
lcd.setCursor(0, 1);
lcd.print("Motor is OFF");
}
}
void loop() {
Blynk.run();//Run the Blynk library
timer.run();
}
Actually by mistake instead of editing earlier post I just posted a new reply , My bad, pardon me. Is this code okay now as it’s showing no error in arduino ide??
But if I do call soilMoisture inside void setup() function, like this
timer.setInterval(5000, soilMoisture);
It’ll spit an error right because I defined void soilMoisture() in another subsequent scope. so, it’ll say soilMoisture was not declared in the scope. Even if I define the void soilMoisture() above the void setup() as we know it is defined locally not globally.
WARNING: library LiquidCrystal I2C claims to run on avr architecture(s) and may be incompatible with your current board which runs on esp32 architecture(s).
C:\Users\lyoga\AppData\Local\Temp\.arduinoIDE-unsaved202378-15212-uaz42o.gtu0s\sketch_aug8a\sketch_aug8a.ino: In function 'void setup()':
C:\Users\lyoga\AppData\Local\Temp\.arduinoIDE-unsaved202378-15212-uaz42o.gtu0s\sketch_aug8a\sketch_aug8a.ino:54:27: error: 'SoilMoisture' was not declared in this scope
timer.setInterval(5000, SoilMoisture)
^~~~~~~~~~~~
C:\Users\lyoga\AppData\Local\Temp\.arduinoIDE-unsaved202378-15212-uaz42o.gtu0s\sketch_aug8a\sketch_aug8a.ino:54:27: note: suggested alternative: 'soilMoisture'
timer.setInterval(5000, SoilMoisture)
^~~~~~~~~~~~
soilMoisture
exit status 1
Compilation error: 'SoilMoisture' was not declared in this scope
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