Hey guys.
Continuing from this thread, I'm using water level sensor for my project, basically when the water >2cm, the pump is on, and when the water is <2cm, pump is off. I'm using 5VDC water pump.
There are three problems:
- Emptying the water box. After pumping the water out, there's still water left.
- The sensor is too sensitive thus making the relay switching too often (see the video).
- When the pump is active for too long, the LCD is showing blank.
The code
#include <Wire.h>
#include <Blynk.h>
#include <LiquidCrystal_I2C.h>
#define BLYNK_PRINT Serial
#include <ESP8266WiFi.h>
#include <BlynkSimpleEsp8266.h>
//Initialize the LCD display
LiquidCrystal_I2C lcd(0x27, 16, 2);
char auth[] = "xxx";//Enter your Auth token
char ssid[] = "xxx";//Enter your WIFI name
char pass[] = "xxx";//Enter your WIFI password
BlynkTimer timer;
#define pinSensor A0 // mendefinisikan pin A0 sebagai pin yang berhubungan dengan sensor
#define PIN_RELAY_1 D3 // the Arduino pin, which connects to the IN1 pin of relay module
#define PIN_RELAY_2 D4 // the Arduino pin, which connects to the IN1 pin of relay module
const int startThreshold = 2; // pumping shall start at startThreshold [cm] and above
const int stopThreshold = 1; // pumping shall start at stopThreshold [cm] and below
int sensorValue = 0; // variable untuk menampung nilai baca dari sensor dalam bentuk integer
float tinggiAir = 0; // variabel untuk menampung ketinggian air
float sensorVoltage = 0; // untuk menampung nilai ketinggian air
int nilaiMax = 686; // nilai "sensorValue" saat sensor terendam penuh kedalam air, bisa dirubah sesuai sensor dan jenis air yang anda pakai
float panjangSensor = 4.0 ; // 4.0 cm, bisa dirubah, menyesuikan dengan panjang sensor yang kalian gunakan
enum StatusType {CHECKLEVEL, LEVELHIGH, PUMPING};
StatusType status = LEVELHIGH; // Let's start with LEVELHIGH to check level and set the display correctly
void setup() {
Serial.begin(115200);
lcd.begin();
Blynk.begin(auth, ssid, pass, "blynk.cloud", 80);
lcd.backlight();
pinMode(PIN_RELAY_1, OUTPUT);
pinMode(PIN_RELAY_2, OUTPUT);
digitalWrite(PIN_RELAY_1, LOW);
digitalWrite(PIN_RELAY_2, LOW);
lcd.setCursor(0, 0);
lcd.print("Water level");
lcd.setCursor(4, 1);
lcd.print("Monitoring");
delay(1000);
lcd.clear();
timer.setInterval(100L, wLevel);
}
void wLevel() {
sensorValue = analogRead(pinSensor); // membaca tengan dari sensor dalam bentuk integer
tinggiAir = sensorValue*panjangSensor/nilaiMax;
sensorVoltage = sensorValue*5.0/686;
}
void loop() {
Blynk.run();
timer.run();
handleStatus();
}
void handleStatus() {
switch (status) {
case CHECKLEVEL:
// Wait for level above threshold
if (tinggiAir >= startThreshold) { // if wlevel more than startThreshold [cm], then
status = LEVELHIGH;
Serial.println("LEVELHIGH");
}
break;
case LEVELHIGH:
levelIsHigh();
break;
case PUMPING:
if (tinggiAir < stopThreshold) { // if wlevel less than stopThreshold [cm] (use hysteresis!) then
levelIsLowAgain();
status = CHECKLEVEL;
Serial.println("CHECKLEVEL");
}
break;
}
displayValues();
}
void displayValues() {
static int oldSensorValue = -1; // variable untuk menampung nilai baca dari sensor dalam bentuk integer
float oldTinggiAir = -1; // variabel untuk menampung ketinggian air
float oldSensorVoltage = -1; // untuk menampung nilai ketinggian air
if (oldSensorValue != sensorValue ||
oldTinggiAir != tinggiAir ||
oldSensorVoltage != sensorVoltage) {
Serial.print("Sensor Value = ");
Serial.println(sensorValue);
Serial.print("Sensor Voltage = ");
Serial.println(sensorVoltage);
Serial.print("Tinggi Air = ");
Serial.println(tinggiAir);
Serial.println();
// Display ke LCD
lcd.setCursor(0, 0);
lcd.print("WLevel:");
lcd.print(tinggiAir);
lcd.setCursor(12, 0);
lcd.print("cm");
oldSensorValue = sensorValue;
oldTinggiAir = tinggiAir;
oldSensorVoltage = sensorVoltage;
Blynk.virtualWrite(V0, tinggiAir);
}
}
void levelIsHigh() {
digitalWrite(PIN_RELAY_1, HIGH);
digitalWrite(PIN_RELAY_2, LOW);
lcd.setCursor(0, 1);
lcd.print("F:OFF P:ON");
Blynk.logEvent("wlevel", "wLevel more than 2cm");
status = PUMPING;
Serial.println("PUMPING");
}
void levelIsLowAgain() {
digitalWrite(PIN_RELAY_1, LOW);
digitalWrite(PIN_RELAY_2, HIGH);
lcd.setCursor(0, 1);
lcd.print("F:ON P:OFF");
status = CHECKLEVEL;
Serial.println("CHECKLEVEL");
}
The sketch
What should I do to solve these problems?
Please help me.
