[vc_row][vc_column width=”1/1″][vc_column_text]Introduction
2010 the latest LCD1602 keypad shield v2.0 for Arduino collect all the advantages of many shields at home and abroad. PCB with immersion gold process, mainboard adopt new high-quality 2 lines16 characters LCD, not only has the contrast adjustment knob, the backlight selector switch, 4 direction keys, 1 select keys and a reset button, four sensor analog interfaces , RB URF v1.1 ultrasonic sensor interface, bluetooth module interface, APC220 wireless digital communication interface, easy-to-use for independent expansion. For beginners of Arduino, the 1602 LCD Keypad Shield v2.0 in the true sense will simplify the circuit. Inserting it into Arduino-compatible Duemilanove controller directly , a 3p sensor connecting line to connect, the sensor data records will be displayed easily.
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[/vc_column_text][/vc_tab][vc_tab title=” Arduino code routine” tab_id=”1393492695-2-35″][vc_column_text]
/* LiquidCrystal Library - Hello World Demonstrates the use a 16x2 LCD display. The LiquidCrystal library works with all LCD displays that are compatible with the Hitachi HD44780 driver. There are many of them out there, and you can usually tell them by the 16-pin interface. This sketch prints "Hello World!" to the LCD and shows the time. The circuit: * LCD RS pin to digital pin 12 * LCD Enable pin to digital pin 11 * LCD D4 pin to digital pin 5 * LCD D5 pin to digital pin 4 * LCD D6 pin to digital pin 3 * LCD D7 pin to digital pin 2 * LCD R/W pin to ground * 10K resistor: * ends to +5V and ground * wiper to LCD VO pin (pin 3) Library originally added 18 Apr 2008 by David A. Mellis library modified 5 Jul 2009 by Limor Fried (http://www.ladyada.net) example added 9 Jul 2009 by Tom Igoe modified 22 Nov 2010 by Tom Igoe This example code is in the public domain. */#define Rbase ((unsigned long)47)#define Rup ((unsigned long)75) #define Rdown ((unsigned long)62) #define Rleft ((unsigned long)47) #define Rright ((unsigned long)39) #define Rselect ((unsigned long)28) // include the library code:#include <LiquidCrystal.h>// initialize the library with the numbers of the interface pinsLiquidCrystal lcd(8, 9, 4, 5, 6, 7);int sensorValue ;int KeyTable[31];void GenerateKeyTable(int vcc,int* array){ float resistor;//////////////1key////////////////////// resistor = ((float)Rup)/(Rbase + Rup); *array++ = resistor*vcc; resistor = ((float)Rdown)/(Rbase + Rdown); *array++ = resistor*vcc; resistor = ((float)Rleft)/(Rbase + Rleft); *array++ = resistor*vcc; resistor = ((float)Rright)/(Rbase + Rright); *array++ = resistor*vcc; resistor = ((float)Rselect)/(Rbase + Rselect); *array++ = resistor*vcc;//////////////2 key///////////////////////// resistor = ((float)Rup)*Rdown/(Rup+Rdown); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup)*Rright/(Rup+Rright); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup)*Rleft/(Rup+Rleft); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup)*Rselect/(Rup+Rselect); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rdown)*Rleft/(Rdown+Rleft); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rdown)*Rright/(Rdown+Rright); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rdown)*Rselect/(Rdown+Rselect); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rright)*Rleft/(Rright+Rleft); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rright)*Rselect/(Rright+Rselect); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft)*Rselect/(Rleft+Rselect); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; ///////////////3 key////////////////////// resistor = ((float)Rup*Rdown*Rright/(Rup*Rright + Rdown*Rright + Rup*Rdown)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup*Rdown*Rleft/(Rup*Rleft + Rdown*Rleft + Rup*Rdown)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup*Rdown*Rselect/(Rup*Rselect + Rdown*Rselect + Rup*Rdown)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft*Rdown*Rright/(Rleft*Rright + Rdown*Rright + Rleft*Rdown)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft*Rdown*Rselect/(Rleft*Rselect + Rdown*Rselect + Rleft*Rdown)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft*Rup*Rright/(Rleft*Rright + Rup*Rright + Rleft*Rup)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft*Rup*Rselect/(Rleft*Rselect + Rup*Rselect + Rleft*Rup)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup*Rright*Rselect/(Rup*Rright + Rright*Rselect + Rup*Rselect)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rdown*Rright*Rselect/(Rdown*Rright + Rright*Rselect + Rdown*Rselect)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rleft*Rright*Rselect/(Rleft*Rright + Rright*Rselect + Rleft*Rselect)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; ////////////////4 key/////////////////////////// resistor = ((float)Rup*Rdown*Rleft*Rright/(Rdown*Rleft*Rright + Rup*Rleft*Rright + Rup*Rdown*Rright + Rup*Rdown*Rleft)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup*Rdown*Rleft*Rselect/(Rdown*Rleft*Rselect + Rup*Rleft*Rselect + Rup*Rdown*Rselect + Rup*Rdown*Rleft)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rup*Rselect*Rleft*Rright/(Rselect*Rleft*Rright + Rup*Rleft*Rright + Rup*Rselect*Rright + Rup*Rselect*Rleft)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rselect*Rdown*Rleft*Rright/(Rdown*Rleft*Rright + Rselect*Rleft*Rright + Rselect*Rdown*Rright + Rselect*Rdown*Rleft)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; resistor = ((float)Rselect*Rdown*Rup*Rright/(Rdown*Rup*Rright + Rselect*Rup*Rright + Rselect*Rdown*Rright + Rselect*Rdown*Rup)); resistor = resistor/(resistor+Rbase); *array++ = resistor*vcc; /////////////////5 key////////////////////////// resistor = ((float)Rup*Rdown*Rleft*Rright*Rselect/(Rdown*Rleft*Rright*Rselect + Rup*Rleft*Rright*Rselect + Rup*Rdown*Rright*Rselect + Rup*Rdown*Rleft*Rselect + Rup*Rdown*Rleft*Rright)); resistor = resistor/(resistor+Rbase); *array = resistor*vcc;}unsigned char GetKey(int value){ char tmpChar; unsigned int Rst; tmpChar = 0; do{ if(value > KeyTable[tmpChar]) Rst = value - KeyTable[tmpChar]; else Rst = KeyTable[tmpChar] - value; tmpChar ++; }while(Rst > 1); return tmpChar--;}void setup() { int tmpInt; // set up the LCD's number of columns and rows: lcd.begin(16, 2); // Print a message to the LCD. lcd.print("hello, world!"); sensorValue = 1023; Serial.begin(9600); GenerateKeyTable(analogRead(A0),KeyTable); for(tmpInt = 0;tmpInt <31;tmpInt++) { Serial.println(KeyTable[tmpInt]); }}void loop() { unsigned char key; if(sensorValue != analogRead(A0)) { sensorValue = analogRead(A0); lcd.setCursor(0, 1); lcd.print(sensorValue); key = GetKey(sensorValue); if(key < 31) { lcd.print("---"); lcd.print(key); lcd.print(' '); } else lcd.print(" "); }}[/vc_column_text][/vc_tab][vc_tab title=”Run renderings” tab_id=”1393493320495-2-6″][vc_gallery type=”flexslider_fade” interval=”3″ images=”3749,3753,3754,3755,3756″ onclick=”link_image” custom_links_target=”_self”][/vc_tab][/vc_tour][/vc_column][/vc_row]
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