Good evening,
I’m looking for some help with a project I’m building for an automated dog watering bowl. The set up I have is as follows,
Ardunio Uno R3 board
2 x water tanks one for supply with fresh water and one which I'm classing as the dog bowl and is topped up from the supply tank.
Both tanks are fitted with temperature monitoring and level monitoring, the levels are HC-SR04 ultrasonic detectors which are calculating the water level in each tank.
In both tanks are 12v submersible water pumps, the one in the supply tank is called PUMP_TANK and is connected to pin 10 and set as output. This pump is meant to fill the bowl from the supply tank. the second pump is in the bowl and is called PUMP_BOWL and is connected to pin 11 and set to output.
The code I have below is working as described but I'm trying to add pump logic to do the following, when the water level in the bowl drops below 3cm for > 3seconds I want the PUMP_TANK to run and keep running until the level in the bowl is > 10cm then stop and return to monitoring mode. Also after 1 hour timer had elapsed I want a re-fill sequence to run which does the following, runs PUMP_BOWL for 15 seconds to drain the bowl, then run PUMP_TANK for 15 seconds to refill the bowl with fresh water.
I have tried all sorts of logic code but I just can't get the pump to switch off when it hits the >10cm trigger. I've not got to the re-fill sequence bit yet as I can't even get the pump to come on at <3cm and go off at >10cm, it seems to just run the PUMP_TANK continuously regardless of the setpoint I put in.
I have ran some basic code such as pushbutton on/off to activate the two pump output pins and this works fine so I know my wiring is all ok in relation to the pumps and their outputs.
I'm thinking it's maybe something with the variable its using for the level and the setpoint I'm providing. I can't understand why a simple if (levelBowl <3cm) {digitalWrite (PUMP_BOWL_PIN, HIGH)} isn't working.
Any help would be greatly appreciated.
```cpp
#include "Wire.h"
#include "OneWire.h"
#include "DallasTemperature.h"
#include "U8x8lib.h"
#define TEMP_SENSOR_TANK_PIN 8
#define TRIG_PIN_TANK 6
#define ECHO_PIN_TANK 7
#define TANK_HEIGHT 179
#define PUMP_TANK_PIN 10
#define TEMP_SENSOR_BOWL_PIN 9
#define TRIG_PIN_BOWL 3
#define ECHO_PIN_BOWL 4
#define BOWL_HEIGHT 135
#define PUMP_BOWL_PIN 11
OneWire oneWireTank(TEMP_SENSOR_TANK_PIN);
DallasTemperature sensorsTank(&oneWireTank);
U8X8_SH1106_128X64_NONAME_HW_I2C u8x8(/* reset=*/ U8X8_PIN_NONE);
OneWire oneWireBowl(TEMP_SENSOR_BOWL_PIN);
DallasTemperature sensorsBowl(&oneWireBowl);
// Function declarations
float getWaterTemperature(String sensorType);
int getWaterDistance(String sensorType);
void setup() {
Serial.begin(9600);
Wire.begin();
u8x8.begin();
u8x8.setFont(u8x8_font_chroma48medium8_r);
sensorsTank.begin();
sensorsBowl.begin();
pinMode(TRIG_PIN_TANK, OUTPUT);
pinMode(ECHO_PIN_TANK, INPUT);
pinMode(PUMP_TANK_PIN, OUTPUT);
pinMode(TRIG_PIN_BOWL, OUTPUT);
pinMode(ECHO_PIN_BOWL, INPUT);
pinMode(PUMP_BOWL_PIN, OUTPUT);
}
void loop() {
// Tank Data
float tempTank = getWaterTemperature("Tank");
int levelTankSensor = getWaterDistance("Tank");
int levelTank = TANK_HEIGHT - levelTankSensor; // Calculate true level
// Bowl Data
float tempBowl = getWaterTemperature("Bowl");
int levelBowlSensor = getWaterDistance("Bowl");
int levelBowl = BOWL_HEIGHT - levelBowlSensor; // Calculate true level
// Print live data to Serial Monitor
Serial.println("Tank Level: " + String(levelTank) + "mm");
Serial.println("Tank Temperature: " + String(tempTank, 1) + "C");
Serial.println("Bowl Level: " + String(levelBowl) + "mm");
Serial.println("Bowl Temperature: " + String(tempBowl, 1) + "C");
// Clear OLED display
u8x8.clearDisplay();
// Display temperature and level on OLED
u8x8.setCursor(1, 0);
u8x8.print("TankLev: ");
u8x8.print(levelTank);
u8x8.print("mm");
u8x8.setCursor(1, 2);
u8x8.print("TankTemp: ");
u8x8.print(tempTank, 1);
u8x8.print("C");
u8x8.setCursor(1, 4);
u8x8.print("BowlLev: ");
u8x8.print(levelBowl);
u8x8.print("mm");
u8x8.setCursor(1, 6);
u8x8.print("BowlTemp: ");
u8x8.print(tempBowl, 1);
u8x8.print("C");
// Monitor Tank
if (levelTank < 10 || tempTank > 25) {
// Halt the system and display error message
u8x8.clearDisplay();
u8x8.setCursor(4, 2);
u8x8.print("Tank");
u8x8.setCursor(3, 4);
u8x8.print("out of spec");
u8x8.setCursor(2, 6);
u8x8.print("Attention needed");
}
}
else {
// Check if conditions are back within the setpoint range to resume normal operation
float tempTank = getWaterTemperature("Tank");
/*int levelTank = getWaterDistance("Tank");*/
int LevelTank;
if (levelTank >= 10 && tempTank <= 18) {
}
}
delay(5000); // Refresh every 5 seconds
}
float getWaterTemperature(String sensorType) {
if (sensorType == "Tank") {
sensorsTank.requestTemperatures();
return sensorsTank.getTempCByIndex(0);
} else if (sensorType == "Bowl") {
sensorsBowl.requestTemperatures();
return sensorsBowl.getTempCByIndex(0);
}
}
int getWaterDistance(String sensorType) {
int trigPin, echoPin;
if (sensorType == "Tank") {
trigPin = TRIG_PIN_TANK;
echoPin = ECHO_PIN_TANK;
} else if (sensorType == "Bowl") {
trigPin = TRIG_PIN_BOWL;
echoPin = ECHO_PIN_BOWL;
}
// Trigger ultrasonic sensor
digitalWrite(trigPin, LOW);
delayMicroseconds(2);
digitalWrite(trigPin, HIGH);
delayMicroseconds(10);
digitalWrite(trigPin, LOW);
// Read echo pulse duration
long duration = pulseIn(echoPin, HIGH);
// Calculate distance in mm
int distance = duration * 0.343 / 2;
return distance;
}
