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What is PWM? | Working of PWM

on August 22, 2018

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lcd interface with 8051 microcontroller in tamil | How to fix LCD positi...

code:- LCD.h sbit rs = P0^0; sbit rw = P0^1; sbit en = P0^2; void delay(unsigned int dela) { unsigned int l,mm; for(mm=0;mm<100;mm++) for(l=0;l<dela;l++); } void lcdcmd(unsigned char cmd) { P2 = cmd; rs = 0; rw = 0; en = 1; delay(15); en = 0; delay(150); } void datawrt_lcd(unsigned char datas) { P2 = datas; rs = 1; rw = 0; en = 1; delay(15); en = 0; delay(150); } void display_lcd(unsigned int row, unsigned int colum, unsigned char *lcdstr) { if(row==1) { lcdcmd(0x80 + colum); } else if(row==2) { lcdcmd(0xc0 + colum); } while (*lcdstr !='\0') { datawrt_lcd(*lcdstr); lcdstr++; } } void lcd_init() { lcdcmd(0x38); lcdcmd(0x0C); lcdcmd(0x01); lcdcmd(0x80); } ////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////////// main.c /////////////////////////////////////////////////////////

Gas leakage detector using Arduino with SMS alert | Gas Detecting Alarm ...

Code:- #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x3F, 16, 2); int temp=0,i,pos ; String stringVal = ""; const char offMessage[] = "Alarm off"; const char activeMessage[][16] = {"Gas Detected", "Please evacuate"}; const int piezo = 10; const int gasSensor = A0; int gas; void setup(){ pinMode(piezo, OUTPUT); pinMode(A0,INPUT); Serial.begin(9600); lcd.begin(); lcd.backlight(); lcd.print("Gas Leakage DTctr"); lcd.setCursor(0,1); lcd.print(" with SMS Alert "); // lcd.scrollDisplayLeft(); //scrolls display left by two positions delay(4000); gsm_init(); lcd.clear(); Serial.println("AT+CNMI=2,2,0,0,0"); delay(300); lcd.print("System Ready"); temp=0; } void loop() { int gas_level=readSensors(); lcd.clear(); if(gas_level>60) { setActive(); init_sms(); send_sms(); lcd_status(); } else

Bidirectional Visitor Counter using IR sensors and Arduino

code:- #include <Wire.h> #include <LiquidCrystal_I2C.h> LiquidCrystal_I2C lcd(0x27, 16, 2); const int Sensora = 2; const int sensorB = 3; const int output = 13; int count = 0; boolean sensorATriggered = false; unsigned long sensorATime; byte currStateA; byte prevStateA = HIGH; boolean sensorBTriggered = false; unsigned long sensorBTime; byte currStateB ; byte prevStateB = HIGH; void setup () { lcd.begin(); lcd.backlight(); Serial.begin (9600); pinMode (Sensora, INPUT); pinMode (sensorB, INPUT); pinMode (output, OUTPUT); lcd.print(" No of visitors "); } void loop () { lcd.setCursor(8,1); currStateA = digitalRead (Sensora); if (currStateA != prevStateA) { if (currStateA == LOW) { sensorATriggered = true; sensorATime = millis (); } } // prevStateA = currStateA; currStateB = digitalRead (sensorB); if (currStateB != prevStateB) { if (currStateB == LOW) { sensorBTriggered

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What is PWM? | Working of PWM

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