Hi everyone, first time posting here, I have been tinkering with Arduino for a few months, in order to develop some tools that helps me at my job at the brewery. We recently acquired a flowmeter ( IFM 6004) that works with 4-20 ma input. The flowmeter only show on screen the Flowrate - L/M) and I wanted to develop an Arduino Add-on that allows me to 1) Read the flow rate on a bigger screen 2 ) Show the TOTAL amount of liter over time 3) allow me to set a target value that would activate a solenoid valve through a relay.
So far I have tackled successfully 1) , the 4-20 ma signal comes through 250 Ohms resistors and the formula gives me a pretty accurate reading. I balanced the spotiness of the ADC reading, making an average of 50 readings and taking the average reading. I am using an arduino Nano and a st 7789 screen
The readings get stable when there is actual flow going through the sensor. But, when the device is turned on, it takes a bit to stabilize, that the reading I included a line that only start counting total liter if the flow is minimum to 0.5 L/m which is a reasonable threshold in my experience
Atm im stucked at a pretty basic issue : The code I wrote for 2) isn't working. Its not adding the values correctly and the increment is not proportional to the readings. Also, I put a single push button that allows me to reset the counter, but its not working either. That makes me suspect the loop I wrote is not correct and I was hoping someone could direct me or help me to solve this issue before I get to 3)
Thank you in advance,
here is my code
#include <Adafruit_ST7789.h>
#include <SPI.h>
#include <Adafruit_GFX.h>
#define TFT_MOSI 11 // SDA Pin on ESP32
#define TFT_SCLK 13 // SCL Pin on ESP32
#define TFT_CS 10 // Chip select control pin
#define TFT_DC 9 // Data Command control pin
#define TFT_RST 8 // Reset pin (could connect to RST pin)
#define BUTTON_PIN 6 // reset counter
Adafruit_ST7789 tft = Adafruit_ST7789(TFT_CS, TFT_DC, TFT_RST);
const int flowPin = A0; // Analog pin for flow sensor
const float conversionFactor = 5.01; // Conversion factor for voltage to flow rate
const float minimumFlow = 0.5; // Minimum flow rate to consider
const int tempPin = A1; //analog pin for temperature
float sensorValue =0;
float sensorValue2 =0;
float voltage =0;
float voltage2 =0;
float Temperature;
float totalFlow = 0.0; // Total accumulated flow in liters
float SetValue = 0.0;
float PotValue =0.0;
void setup() {
Serial.begin(9600); // Initialize serial communication
pinMode(BUTTON_PIN, INPUT_PULLUP);
tft.init(240, 320, SPI_MODE2); // Init ST7789 display 135x240 pixel
tft.setRotation(1);
tft.fillScreen(ST77XX_BLACK);
TftSetup();
}
void loop() {
ReadADC();
ReadADC2();
float Temperature = ((voltage2/1000)*24.73)-42.38;
float flowRate = ((voltage/1000)*6.173)-6.285; // Convert voltage to flow rate
float PotValue = analogRead(A4);
float SetValue = map(PotValue,0,1023,0,500);
Serial.print("Sensor Value : ");
Serial.print(sensorValue);
Serial.print(" Voltage: ");
Serial.print(voltage);
Serial.print("Flow Rate: ");
Serial.print(flowRate);
Serial.print("Temperature : ");
Serial.print(Temperature);
Serial.print(" L/min\t");
Serial.print("Total Flow: ");
Serial.print(totalFlow);
Serial.println(" Liters");
if (flowRate > minimumFlow) {
float deltaTime = 1.0; // Time interval in seconds (assuming 1 second)
float flowIncrement = flowRate * deltaTime / 60.0; // Convert flow rate to flow increment in liters
totalFlow += flowIncrement; // Accumulate the flow
byte buttonState = digitalRead(BUTTON_PIN);
if (buttonState == LOW) {
totalFlow = 0;
}
else {
}
// Print the current flow rate and total flow
Serial.print("Voltage: ");
Serial.print(voltage);
Serial.print("Flow Rate: ");
Serial.print(flowRate);
Serial.print(" L/min\t");
Serial.print("Total Flow: ");
Serial.print(totalFlow);
Serial.println(" Liters");
}
// Delay for 1 second before the next reading
tft.setCursor(0, 0);
tft.fillRect(5, 5, 150,90,ST77XX_BLACK);
tft.setCursor(25, 25);
tft.setTextColor(ST77XX_ORANGE);
tft.setTextSize(5);
tft.print(flowRate, 1);
//
tft.fillRect(165, 5, 150,90,ST77XX_BLACK);
tft.setCursor(185, 25);
tft.setTextColor(ST77XX_BLUE);
tft.setTextSize(5);
tft.print(SetValue, 0);
//temperature
tft.fillRect(5, 125, 150,90,ST77XX_BLACK);
tft.setCursor(25, 145);
tft.setTextColor(ST77XX_RED);
tft.setTextSize(5);
tft.print(Temperature, 0);
//Total flow
tft.fillRect(165, 125, 150,90,ST77XX_BLACK);
tft.setCursor(185, 145);
tft.setTextColor(ST77XX_GREEN);
tft.setTextSize(5);
tft.print(totalFlow, 1);
delay(1000);
}
void ReadADC()
{
sensorValue= 0.0;
for (int i = 0; i < 50; i++) //Do 100 readings
{
sensorValue += analogRead(flowPin);
delay(5);
}
voltage = (float)(sensorValue/50)* (5010/ 1023.0);
}
void ReadADC2()
{
sensorValue2= 0.0;
for (int i = 0; i < 100; i++) //Do 100 readings
{
sensorValue2 += analogRead(tempPin);
delay(5);
}
voltage2 = (float)(sensorValue2/100)* (5010 / 1023.0);
}
void TftSetup()
{
tft.setTextWrap(false);
tft.setCursor(0, 0);
tft.fillRect(0, 0, 160,120,ST77XX_ORANGE);
tft.fillRect(3, 3, 154,114,ST77XX_BLACK);
tft.fillRect(160, 0, 160,120,ST77XX_BLUE);
tft.fillRect(163, 3, 154,114,ST77XX_BLACK);
tft.fillRect(0, 120, 160,120,ST77XX_RED);
tft.fillRect(3, 123, 154,114,ST77XX_BLACK);
tft.fillRect(160, 120, 160,120,ST77XX_GREEN);
tft.fillRect(163, 123, 154,114,ST77XX_BLACK);
tft.setCursor(100, 92);
tft.setTextColor(ST77XX_ORANGE);
tft.setTextSize(3);
tft.println("L/m");
tft.setCursor(105, 217);
tft.setTextColor(ST77XX_RED);
tft.setTextSize(2);
tft.println("Temp");
tft.setCursor(214, 98);
tft.setTextColor(ST77XX_BLUE);
tft.println("Set Flow");
tft.setCursor(195, 217);
tft.setTextColor(ST77XX_GREEN);
tft.setTextSize(2);
tft.println("Total Flow");
}
