diff --git a/LCD_Keypad_Shield_with_PH_Meter.ino b/LCD_Keypad_Shield_with_PH_Meter.ino new file mode 100644 index 0000000..8471b61 --- /dev/null +++ b/LCD_Keypad_Shield_with_PH_Meter.ino @@ -0,0 +1,391 @@ + +/************************************************************************************* + + Kevin Lo, March 2015 + + This program will show PH , Room Temperature and Water Temperature on the LCD panel. + Also support serial communication. + + Connection: + 1) Plug the LCD Keypad to the UNO + 2) Connect D2 to DS18B20 + 3) Connect A1 to LM35 + 4) Connect A2 to PH + + Require Library : + LiquidCrystal : http://arduino.cc/en/Reference/LiquidCrystal + OneWire : http://milesburton.com/Dallas_Temperature_Control_Library + DallasTemperature : http://milesburton.com/Dallas_Temperature_Control_Library + + Serial Communication : + Send command in HEX format . + AA 01 01 BB , Enquiry DS18B20 temperature + AA 01 02 BB , Enquiry LM35 temperature + AA 01 03 BB , Enquiry PH reading + AA 01 04 BB , Enqyiry DS18B20 , LM35 and Ph + + Version : + v0.1 5/3/2015 First Version + +**************************************************************************************/ + +#include +#include +#include + +LiquidCrystal lcd(8, 9, 4, 5, 6, 7); // select the pins used on the LCD panel +#define ONE_WIRE_BUS 2 // DS18B20 connect to Pin 2 + +OneWire oneWire(ONE_WIRE_BUS); +DallasTemperature sensors(&oneWire); + +#define STX 0xAA // define STX for serial communication +#define ETX 0XBB // define ETX for serial communication + +byte RxCmd [4] = {0,0,0,0}; + +// define some values used by the panel and buttons +int lcd_key = -1; +int adc_key_in = 0; +int adc_key_prev = -1; +int CurrentMode = 0; // 0 = Normal Display , 1 = Debug1 , 2 = Debug2 +int CalSelect = 0; // 0 = PH4 Calibration Select , 1 = PH7 Calibration Select + +const int NumReadings = 10; // number of reading for LM35 +int Index = 0; // index +int TempReadings[NumReadings]; // array for store LM35 readings +int TempTotal = 0; // LM35 running total +int TempAverage = 0; // LM35 average reading +double TempValue = 0; // LM35 Temperature Data in Human Reading Format after calculation + +int PhReadings[NumReadings]; // array for store PH readings +int PhTotal = 0; // PH running total +int PhAverage = 0; // PH average reading + +double Ph7Buffer = 6.86; // For PH7 buffer solution's PH value , 7 or 6.86 +double Ph4Buffer = 4.01; // For PH4 buffer solution's PH value , 4 or 4.01 + +double Ph7Reading = 528; // PH7 Buffer Solution Reading. +double Ph4Reading = 655; // PH4 Buffer Solution Reading. + +double PhRatio = 0; // PH Step +double PhValue = 0; // Ph Value in Human Reading Format after calculation + +#define btnRIGHT 0 +#define btnUP 1 +#define btnDOWN 2 +#define btnLEFT 3 +#define btnSELECT 4 +#define btnNONE 5 + +int read_LCD_buttons(){ // read the buttons + adc_key_in = analogRead(0); // read the value from the sensor + delay(10); // switch debounce delay. Increase this delay if incorrect switch selections are returned. + int k = (analogRead(0) - adc_key_in); // gives the button a slight range to allow for a little contact resistance noise + 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. + //lcd.print(adc_key_in); // read button value and print for calibrate + + // my buttons when read are centered at these valies: 0, 144, 329, 504, 741 + // we add approx 50 to those values and check to see if we are close + // We make this the 1st option for speed reasons since it will be the most likely result + + if (adc_key_in > 1000) return btnNONE; + if (adc_key_in < 50) return btnRIGHT; + if (adc_key_in < 150) return btnUP; + if (adc_key_in < 350) return btnDOWN; + if (adc_key_in < 550) return btnLEFT; + if (adc_key_in < 750) return btnSELECT; + return btnNONE; // when all others fail, return this. +} + +int reading(){ // Reading LM35 and PH Data + // Samplin LM35 and PH Value + TempTotal= TempTotal - TempReadings[Index]; // subtract the last reading: + PhTotal= PhTotal - PhReadings[Index]; // subtract the last reading: + TempReadings[Index] = analogRead(1); // read from the sensor : LM35 + PhReadings[Index] = analogRead(2); // read from the sensor : PH + TempTotal= TempTotal + TempReadings[Index]; // add the reading to the temperature total: + PhTotal= PhTotal + PhReadings[Index]; // add the reading to the ph total: + Index = Index + 1; // advance to the next position in the array: + + if (Index >= NumReadings){ // if we're at the end of the array... + Index = 0; // ...wrap around to the beginning: + TempAverage = TempTotal / NumReadings; // calculate the average: + PhAverage = PhTotal / NumReadings; // calculate the average: + } + TempValue = (double) TempAverage / 3.4 * (5/10.24); // LM35 connect to CA3140 for amplify 3 time + PhValue = (Ph7Reading - PhAverage) / PhRatio + Ph7Buffer; // Calculate PH + +} + +void setup(){ + lcd.begin(16, 2); // start LCD library + + for (int TempThisReading = 0; TempThisReading < NumReadings; TempThisReading++) // initialize all the LM35 readings to 0: + TempReadings[TempThisReading] = 0; + + for (int PhThisReading = 0; PhThisReading < NumReadings; PhThisReading++) // initialize all the Ph readings to 0: + PhReadings[PhThisReading] = 0; + + PhRatio = (Ph4Reading - Ph7Reading) / (Ph7Buffer - Ph4Buffer); // Calculate Ph Ratio + + Serial.begin(9600); + while(Serial.available()) Serial.read(); // empty RX buffer + Serial.println("Starting"); +} + +void loop(){ + + if (Serial.available()) { + delay(2); + RxCmd[0] = Serial.read(); + if (RxCmd[0] == STX) { + int i =1; + while(Serial.available()) { + delay(1); + RxCmd[i] = Serial.read(); + //if (RxCmd[i]>127 || i>7) break; //Communication error + if (RxCmd[i]==ETX) { + break; //Read all data + } + i++; + } + } + } + +if ( RxCmd[1] == 1 ){ + lcd.setCursor(9,1); + switch (RxCmd[2]) { + case 1:{ + //Serial.print("Command 1 Received "); // Enquiry Water Temperature (DS18B20) + Serial.println(sensors.getTempCByIndex(0),2); // Return DS18B20 Data + break; + } + case 2:{ + //Serial.print("Command 2 Received "); // Enquiry Room Temperature (LM35) + Serial.println(TempValue,2); // Return LM35 Data + break; + } + case 3:{ + //Serial.print("Command 3 Received "); // Enquiry PH Data + Serial.println(PhValue,2); // Return PH Data + break; + } + case 4:{ + //Serial.println("Command 4 Received "); // Enquiry Water Temp. & Room Temp. & PH + Serial.println(sensors.getTempCByIndex(0),2); // Return DS18B20 Data + Serial.println(TempValue,2); // Return LM35 Data + Serial.println(PhValue,2); // Return PH Data + break; + } + } +} + + for (int i = 0 ; i < 5 ; i++) { + RxCmd[i] = 0; + } + +if (CurrentMode == 0) // Nomral Display Mode +{ + reading(); // Reading LM35 and PH Data for display + lcd.setCursor(13,0); + lcd.print("PH "); + lcd.setCursor(0,0); // set the LCD cursor position + lcd.print("Room"); + lcd.setCursor(0,1); + lcd.print("Water"); + lcd.setCursor(6,0); + lcd.print(TempValue); // display room temperature value (LM35) + delay(1); // delay in between reads for stability + + // Display 18B20 Temperature + lcd.setCursor(6,1); // move cursor to second line "1" and 6 spaces over + sensors.requestTemperatures(); // Read DS18B20 data + lcd.print(sensors.getTempCByIndex(0)); // Display DS18B20 Data + + // Display PH Data + lcd.setCursor(13,0); + lcd.print("PH"); + lcd.setCursor(12,1); + lcd.print(PhValue); // display PH value + delay(1); // delay in between reads for stability + +} + +if (CurrentMode == 1){ + reading(); + lcd.setCursor(0,0); + lcd.print("LM35 R"); + lcd.setCursor(10,0); + lcd.print("T"); + lcd.setCursor(0,1); + lcd.print("PH R"); + lcd.setCursor(10,1); + lcd.print("P"); + + lcd.setCursor(6,0); + lcd.print(TempAverage); + lcd.setCursor(12,0); + lcd.print(TempValue); + + lcd.setCursor(6,1); + lcd.print(PhAverage); + lcd.setCursor(11,1); + lcd.print(PhValue); +} + +if (CurrentMode == 2){ + reading(); + double PhVoltage; + PhVoltage = (double)PhAverage * (5/10.24); + + lcd.setCursor(0,0); + lcd.print("R:"); + lcd.setCursor(3,0); + lcd.print(PhAverage); + + + lcd.setCursor(7,0); + lcd.print("Ratio:"); + lcd.setCursor(13,0); + lcd.print(PhRatio); + + lcd.setCursor(0,1); + lcd.print("PH:"); + lcd.setCursor(3,1); + lcd.print(PhValue); +} + +if (CurrentMode == 3){ // Calibration Mode Selection Page + lcd.setCursor(0,0); + lcd.print("PH4 Cal "); + lcd.setCursor(0,1); + lcd.print("PH7 Cal "); + if (CalSelect == 0) { + lcd.setCursor(8,0); + lcd.print(">>"); + } + if (CalSelect == 1) { + lcd.setCursor(8,1); + lcd.print(">>"); + } +} + +if (CurrentMode == 4){ // PH4 Calibration Mode + reading(); + lcd.setCursor(0,0); + lcd.print("PH4 Cal. Mode"); + lcd.setCursor(0,1); + lcd.print("C:"); + lcd.setCursor(2,1); + lcd.print(Ph4Reading); + lcd.setCursor(9,1); + lcd.print("R:"); + lcd.setCursor(11,1); + lcd.print(PhAverage); +} + +if (CurrentMode == 5){ // PH7 Calibration Mode + reading(); + lcd.setCursor(0,0); + lcd.print("PH7 Cal. Mode"); + lcd.setCursor(0,1); + lcd.print("C:"); + lcd.setCursor(2,1); + lcd.print(Ph7Reading); + lcd.setCursor(9,1); + lcd.print("R:"); + lcd.setCursor(11,1); + lcd.print(PhAverage); +} + + + lcd.setCursor(0,1); // move to the begining of the second line + adc_key_prev = lcd_key ; // Looking for changes + + lcd_key = read_LCD_buttons(); // read the buttons + + if (adc_key_prev != lcd_key) + { + //Serial.println("Key Press Change Detected"); + switch (lcd_key){ // depending on which button was pushed, we perform an action + case btnRIGHT:{ // push button "RIGHT" and show the word on the screen + //lcd.print("RIGHT"); + if ( CurrentMode == 0 ){ + lcd.clear(); + CurrentMode = 2; + } + if ( CurrentMode == 3){ + lcd.clear(); + if ( CalSelect == 0 ){ + CurrentMode = 4; + } + if ( CalSelect == 1){ + CurrentMode = 5; + } + } + break; + } + case btnLEFT:{ + //lcd.print("LEFT "); // push button "LEFT" and show the word on the screen + if ( CurrentMode == 2 ){ + lcd.clear(); + CurrentMode = 0; + } + if ( CurrentMode == 3 ){ + lcd.clear(); + CurrentMode = 0; + } + if ( CurrentMode == 4 || CurrentMode == 5 ){ + lcd.clear(); + CurrentMode = 3; + } + + break; + } + case btnUP:{ + //lcd.print("UP "); // push button "UP" and show the word on the screen + if ( CurrentMode == 0 ){ + lcd.clear(); + CurrentMode = 1; + } + if ( CurrentMode == 3 ){ + lcd.clear(); + CalSelect = 0; + } + break; + } + case btnDOWN:{ + //lcd.print("DOWN "); // push button "DOWN" and show the word on the screen + if ( CurrentMode == 1){ + lcd.clear(); + CurrentMode = 0; + } + if ( CurrentMode == 3 ){ + lcd.clear(); + CalSelect = 1; + } + break; + } + case btnSELECT:{ + //lcd.print("SEL. "); // push button "SELECT" and show the word on the screen + if ( CurrentMode == 0 ){ + lcd.clear(); + CurrentMode = 3; + break; + } + if ( CurrentMode == 3 ){ + lcd.clear(); + CurrentMode = 0; + break; + } + break; + + } + case btnNONE:{ + //lcd.print("NONE "); // No action will show "None" on the screen + break; + } + } + } +}