Kevin Lo
392 lines
13 KiB
Arduino
392 lines
13 KiB
Arduino
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/*************************************************************************************
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Kevin Lo, March 2015
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This program will show PH , Room Temperature and Water Temperature on the LCD panel.
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Also support serial communication.
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Connection:
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1) Plug the LCD Keypad to the UNO
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2) Connect D2 to DS18B20
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3) Connect A1 to LM35
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4) Connect A2 to PH
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Require Library :
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LiquidCrystal : http://arduino.cc/en/Reference/LiquidCrystal
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OneWire : http://milesburton.com/Dallas_Temperature_Control_Library
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DallasTemperature : http://milesburton.com/Dallas_Temperature_Control_Library
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Serial Communication :
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Send command in HEX format .
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AA 01 01 BB , Enquiry DS18B20 temperature
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AA 01 02 BB , Enquiry LM35 temperature
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AA 01 03 BB , Enquiry PH reading
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AA 01 04 BB , Enqyiry DS18B20 , LM35 and Ph
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Version :
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v0.1 5/3/2015 First Version
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**************************************************************************************/
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#include <LiquidCrystal.h>
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#include <OneWire.h>
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#include <DallasTemperature.h>
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LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // select the pins used on the LCD panel
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#define ONE_WIRE_BUS 2 // DS18B20 connect to Pin 2
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OneWire oneWire(ONE_WIRE_BUS);
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DallasTemperature sensors(&oneWire);
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#define STX 0xAA // define STX for serial communication
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#define ETX 0XBB // define ETX for serial communication
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byte RxCmd [4] = {0,0,0,0};
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// define some values used by the panel and buttons
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int lcd_key = -1;
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int adc_key_in = 0;
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int adc_key_prev = -1;
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int CurrentMode = 0; // 0 = Normal Display , 1 = Debug1 , 2 = Debug2
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int CalSelect = 0; // 0 = PH4 Calibration Select , 1 = PH7 Calibration Select
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const int NumReadings = 10; // number of reading for LM35
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int Index = 0; // index
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int TempReadings[NumReadings]; // array for store LM35 readings
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int TempTotal = 0; // LM35 running total
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int TempAverage = 0; // LM35 average reading
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double TempValue = 0; // LM35 Temperature Data in Human Reading Format after calculation
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int PhReadings[NumReadings]; // array for store PH readings
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int PhTotal = 0; // PH running total
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int PhAverage = 0; // PH average reading
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double Ph7Buffer = 6.86; // For PH7 buffer solution's PH value , 7 or 6.86
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double Ph4Buffer = 4.01; // For PH4 buffer solution's PH value , 4 or 4.01
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double Ph7Reading = 528; // PH7 Buffer Solution Reading.
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double Ph4Reading = 655; // PH4 Buffer Solution Reading.
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double PhRatio = 0; // PH Step
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double PhValue = 0; // Ph Value in Human Reading Format after calculation
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#define btnRIGHT 0
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#define btnUP 1
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#define btnDOWN 2
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#define btnLEFT 3
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#define btnSELECT 4
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#define btnNONE 5
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int read_LCD_buttons(){ // read the buttons
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adc_key_in = analogRead(0); // read the value from the sensor
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delay(10); // switch debounce delay. Increase this delay if incorrect switch selections are returned.
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int k = (analogRead(0) - adc_key_in); // gives the button a slight range to allow for a little contact resistance noise
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if (5 < abs(k)) return btnNONE; // double checks the keypress. If the two readings are not equal +/-k value after debounce delay, it tries again.
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//lcd.print(adc_key_in); // read button value and print for calibrate
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// my buttons when read are centered at these valies: 0, 144, 329, 504, 741
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// we add approx 50 to those values and check to see if we are close
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// We make this the 1st option for speed reasons since it will be the most likely result
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if (adc_key_in > 1000) return btnNONE;
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if (adc_key_in < 50) return btnRIGHT;
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if (adc_key_in < 150) return btnUP;
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if (adc_key_in < 350) return btnDOWN;
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if (adc_key_in < 550) return btnLEFT;
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if (adc_key_in < 750) return btnSELECT;
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return btnNONE; // when all others fail, return this.
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}
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int reading(){ // Reading LM35 and PH Data
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// Samplin LM35 and PH Value
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TempTotal= TempTotal - TempReadings[Index]; // subtract the last reading:
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PhTotal= PhTotal - PhReadings[Index]; // subtract the last reading:
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TempReadings[Index] = analogRead(1); // read from the sensor : LM35
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PhReadings[Index] = analogRead(2); // read from the sensor : PH
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TempTotal= TempTotal + TempReadings[Index]; // add the reading to the temperature total:
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PhTotal= PhTotal + PhReadings[Index]; // add the reading to the ph total:
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Index = Index + 1; // advance to the next position in the array:
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if (Index >= NumReadings){ // if we're at the end of the array...
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Index = 0; // ...wrap around to the beginning:
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TempAverage = TempTotal / NumReadings; // calculate the average:
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PhAverage = PhTotal / NumReadings; // calculate the average:
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}
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TempValue = (double) TempAverage / 3.4 * (5/10.24); // LM35 connect to CA3140 for amplify 3 time
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PhValue = (Ph7Reading - PhAverage) / PhRatio + Ph7Buffer; // Calculate PH
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}
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void setup(){
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lcd.begin(16, 2); // start LCD library
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for (int TempThisReading = 0; TempThisReading < NumReadings; TempThisReading++) // initialize all the LM35 readings to 0:
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TempReadings[TempThisReading] = 0;
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for (int PhThisReading = 0; PhThisReading < NumReadings; PhThisReading++) // initialize all the Ph readings to 0:
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PhReadings[PhThisReading] = 0;
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PhRatio = (Ph4Reading - Ph7Reading) / (Ph7Buffer - Ph4Buffer); // Calculate Ph Ratio
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Serial.begin(9600);
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while(Serial.available()) Serial.read(); // empty RX buffer
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Serial.println("Starting");
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}
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void loop(){
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if (Serial.available()) {
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delay(2);
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RxCmd[0] = Serial.read();
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if (RxCmd[0] == STX) {
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int i =1;
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while(Serial.available()) {
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delay(1);
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RxCmd[i] = Serial.read();
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//if (RxCmd[i]>127 || i>7) break; //Communication error
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if (RxCmd[i]==ETX) {
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break; //Read all data
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}
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i++;
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}
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}
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}
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if ( RxCmd[1] == 1 ){
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lcd.setCursor(9,1);
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switch (RxCmd[2]) {
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case 1:{
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//Serial.print("Command 1 Received "); // Enquiry Water Temperature (DS18B20)
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Serial.println(sensors.getTempCByIndex(0),2); // Return DS18B20 Data
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break;
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}
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case 2:{
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//Serial.print("Command 2 Received "); // Enquiry Room Temperature (LM35)
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Serial.println(TempValue,2); // Return LM35 Data
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break;
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}
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case 3:{
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//Serial.print("Command 3 Received "); // Enquiry PH Data
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Serial.println(PhValue,2); // Return PH Data
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break;
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}
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case 4:{
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//Serial.println("Command 4 Received "); // Enquiry Water Temp. & Room Temp. & PH
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Serial.println(sensors.getTempCByIndex(0),2); // Return DS18B20 Data
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Serial.println(TempValue,2); // Return LM35 Data
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Serial.println(PhValue,2); // Return PH Data
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break;
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}
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}
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}
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for (int i = 0 ; i < 5 ; i++) {
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RxCmd[i] = 0;
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}
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if (CurrentMode == 0) // Nomral Display Mode
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{
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reading(); // Reading LM35 and PH Data for display
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lcd.setCursor(13,0);
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lcd.print("PH ");
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lcd.setCursor(0,0); // set the LCD cursor position
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lcd.print("Room");
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lcd.setCursor(0,1);
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lcd.print("Water");
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lcd.setCursor(6,0);
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lcd.print(TempValue); // display room temperature value (LM35)
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delay(1); // delay in between reads for stability
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// Display 18B20 Temperature
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lcd.setCursor(6,1); // move cursor to second line "1" and 6 spaces over
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sensors.requestTemperatures(); // Read DS18B20 data
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lcd.print(sensors.getTempCByIndex(0)); // Display DS18B20 Data
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// Display PH Data
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lcd.setCursor(13,0);
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lcd.print("PH");
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lcd.setCursor(12,1);
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lcd.print(PhValue); // display PH value
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delay(1); // delay in between reads for stability
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}
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if (CurrentMode == 1){
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reading();
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lcd.setCursor(0,0);
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lcd.print("LM35 R");
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lcd.setCursor(10,0);
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lcd.print("T");
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lcd.setCursor(0,1);
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lcd.print("PH R");
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lcd.setCursor(10,1);
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lcd.print("P");
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lcd.setCursor(6,0);
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lcd.print(TempAverage);
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lcd.setCursor(12,0);
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lcd.print(TempValue);
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lcd.setCursor(6,1);
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lcd.print(PhAverage);
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lcd.setCursor(11,1);
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lcd.print(PhValue);
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}
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if (CurrentMode == 2){
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reading();
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double PhVoltage;
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PhVoltage = (double)PhAverage * (5/10.24);
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lcd.setCursor(0,0);
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lcd.print("R:");
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lcd.setCursor(3,0);
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lcd.print(PhAverage);
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lcd.setCursor(7,0);
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lcd.print("Ratio:");
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lcd.setCursor(13,0);
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lcd.print(PhRatio);
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lcd.setCursor(0,1);
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lcd.print("PH:");
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lcd.setCursor(3,1);
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lcd.print(PhValue);
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}
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if (CurrentMode == 3){ // Calibration Mode Selection Page
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lcd.setCursor(0,0);
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lcd.print("PH4 Cal ");
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lcd.setCursor(0,1);
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lcd.print("PH7 Cal ");
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if (CalSelect == 0) {
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lcd.setCursor(8,0);
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lcd.print(">>");
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}
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if (CalSelect == 1) {
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lcd.setCursor(8,1);
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lcd.print(">>");
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}
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}
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if (CurrentMode == 4){ // PH4 Calibration Mode
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reading();
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lcd.setCursor(0,0);
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lcd.print("PH4 Cal. Mode");
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lcd.setCursor(0,1);
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lcd.print("C:");
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lcd.setCursor(2,1);
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lcd.print(Ph4Reading);
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lcd.setCursor(9,1);
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lcd.print("R:");
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lcd.setCursor(11,1);
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lcd.print(PhAverage);
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}
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if (CurrentMode == 5){ // PH7 Calibration Mode
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reading();
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lcd.setCursor(0,0);
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lcd.print("PH7 Cal. Mode");
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lcd.setCursor(0,1);
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lcd.print("C:");
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lcd.setCursor(2,1);
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lcd.print(Ph7Reading);
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lcd.setCursor(9,1);
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lcd.print("R:");
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lcd.setCursor(11,1);
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lcd.print(PhAverage);
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}
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lcd.setCursor(0,1); // move to the begining of the second line
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adc_key_prev = lcd_key ; // Looking for changes
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lcd_key = read_LCD_buttons(); // read the buttons
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if (adc_key_prev != lcd_key)
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{
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//Serial.println("Key Press Change Detected");
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switch (lcd_key){ // depending on which button was pushed, we perform an action
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case btnRIGHT:{ // push button "RIGHT" and show the word on the screen
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//lcd.print("RIGHT");
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if ( CurrentMode == 0 ){
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lcd.clear();
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CurrentMode = 2;
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}
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if ( CurrentMode == 3){
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lcd.clear();
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if ( CalSelect == 0 ){
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CurrentMode = 4;
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}
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if ( CalSelect == 1){
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CurrentMode = 5;
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}
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}
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break;
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}
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case btnLEFT:{
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//lcd.print("LEFT "); // push button "LEFT" and show the word on the screen
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if ( CurrentMode == 2 ){
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lcd.clear();
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CurrentMode = 0;
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}
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if ( CurrentMode == 3 ){
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lcd.clear();
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CurrentMode = 0;
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}
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if ( CurrentMode == 4 || CurrentMode == 5 ){
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lcd.clear();
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CurrentMode = 3;
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}
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break;
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}
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case btnUP:{
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//lcd.print("UP "); // push button "UP" and show the word on the screen
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if ( CurrentMode == 0 ){
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lcd.clear();
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CurrentMode = 1;
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}
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if ( CurrentMode == 3 ){
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lcd.clear();
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CalSelect = 0;
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}
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break;
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}
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case btnDOWN:{
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//lcd.print("DOWN "); // push button "DOWN" and show the word on the screen
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if ( CurrentMode == 1){
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lcd.clear();
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CurrentMode = 0;
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}
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if ( CurrentMode == 3 ){
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lcd.clear();
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CalSelect = 1;
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}
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break;
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}
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case btnSELECT:{
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//lcd.print("SEL. "); // push button "SELECT" and show the word on the screen
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if ( CurrentMode == 0 ){
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lcd.clear();
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CurrentMode = 3;
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break;
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}
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if ( CurrentMode == 3 ){
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lcd.clear();
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CurrentMode = 0;
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break;
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}
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break;
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}
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case btnNONE:{
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//lcd.print("NONE "); // No action will show "None" on the screen
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break;
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}
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}
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}
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}
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