"Hi everyone ,Week 11 output devices begin.As i planned to work on my project related thing in output week followed by input week.I hope i will get the things properly.I am thinking about my final project where i have decided to used LCD display on sever side board .So in this week i am hopeing to interfaced my Server board along with LCD display with LM 35.My major goal of this week is to work on my output board having LCD display and LED's and test the code using ardiono IDE .So lets start working on output devices.
An output device is used to send data out of the system.Output device is any piece of computer hardware equipment which converts information into human-readable form. It can be text, graphics, tactile, audio, and video.Some of the output devices are Visual Display Units (VDU) i.e. a Monitor, Printer.So in short all we need an output device to display the information in the form of text ,graphics.
So as part of my output device which i am going to used in my final project is Text display.For that i referred Neil's document of output devices week.Where i found three display.LCD,OLED & TFT.
About LCD Display:
What is LCD 16 * 2?
An liquid-crystal display (LCD) is an electronic display module which uses liquid crystal to produce a visible image. The 16×2 LCD display is a very basic module commonly used in DIYs and circuits. The 16×2 translates o a display 16 characters per line in 2 such lines. In this LCD each character is displayed in a 5×7 pixel matrix.(electronicsforu)
(Note:Please go through the following things in detailed.Dont jump to another topic.I also skip this part which cause unnecessary problem.So to avod this read the following thing carefully.)
What is the cost of LCD display?
The LCD I am going to used is of $9.65.For more information visit website
In our FAB inventory we have LCM-S01602DTR/M 16 X 2 LCD display .The 16 X 2 LCM-S01602DTR/M pin out is shown below.
Pin1 VSS :This is a GND pin of display, used to connect the GND terminal of the microcontroller unit or power source.
Pin2 VDD: This is the voltage supply pin of the display, used to connect the supply pin of the power source.
Pin3 V0: This pin regulates the difference of the display, used to connect a changeable POT that can supply 0 to 5V.
Pin4 RS: This pin toggles among command or data register, used to connect a microcontroller unit pin and obtains either 0 or 1(0 = data mode, and 1 = command mode).
Pin5 R/W : This pin toggles the display among the read or writes operation, and it is connected to a microcontroller unit pin to get either 0 or 1 (0 = Write Operation, and 1 = Read Operation).
Pin6 E :This pin should be held high to execute Read/Write process, and it is connected to the microcontroller unit & constantly held high.
Pin7-14 DB0-DB7: These pins are used to send data to the display. These pins are connected in two-wire modes like 4-wire mode and 8-wire mode. In 4-wire mode, only four pins are connected to the microcontroller unit like 0 to 3, whereas in 8-wire mode, 8-pins are connected to microcontroller unit like 0 to 7.
( Remember: Pin15 & Pin16 are not connected pins.So you dont need to connect anything to it.So just interface the Pin 1-Pin 14 to backpack)
Manufacturer Lumex Opto/Components Inc.
Number of Characters 32
Display Format 16 x 2
Character Format 5 x 8 Dots
Display Type TN - Twisted Nematic
Voltage - Supply 5V
Operating Temperature 0°C ~ 50°C
Background Color Green
The commands of LCD 16X2 include the following.
For Hex Code-01, the LCD command will be the clear LCD screen
For Hex Code-02, the LCD command will be returning home
For Hex Code-04, the LCD command will be decrement cursor
For Hex Code-06, the LCD command will be Increment cursor
For Hex Code-05, the LCD command will be Shift display right
For Hex Code-07, the LCD command will be Shift display left
For Hex Code-08, the LCD command will be Display off, cursor off
For Hex Code-0A, the LCD command will be cursor on and display off
For Hex Code-0C, the LCD command will be cursor off, display on
For Hex Code-0E, the LCD command will be cursor blinking, Display on
For Hex Code-0F, the LCD command will be cursor blinking, Display on
For Hex Code-10, the LCD command will be Shift cursor position to left
For Hex Code-14, the LCD command will be Shift cursor position to the right
For Hex Code-18, the LCD command will be Shift the entire display to the left
For Hex Code-1C, the LCD command will be Shift the entire display to the right
For Hex Code-80, the LCD command will be Force cursor to the beginning ( 1st line)
For Hex Code-C0, the LCD command will be Force cursor to the beginning ( 2nd line)
For Hex Code-38, the LCD command will be 2 lines and 5×7 matrix
what is i2c. I2C (I-square-C i.e I2C) means inter-integrated communication protocol. This is usually used to communicate between one master and multiple slaves. One of the best things about using I2C is we can reduce the connections (wiring). If you use normal LCD display, you need a total number of connections are 12. If you use I2C LCD display, you need only just 4 connection. By seeing the above example you may know the advantage of I2C protocol. I2C protocol is also known as 2 line protocol.
If you properly have seen the picture above, you will see a black adapter. That black adapter uses the PCF8574T IC chip which converts I2C serial data to parallel data for the LCD display. The blue color component you have seen in the above picture is a potentiometer which is used to adjust the brightness of the display.
Interfaced I2C with 16X2 LCD(LCM-S01602DTR/M)
Remember:In above interfacing i used LCM-S01602DTR/M 16X2 LCD.
To start programming part that you wish to upload you need to follow 3 steps procedure which i mentioned below.
Step1. Write a scanner program
Why? As i used I2C module along with 16 X 2 LCD display first you need to find out address of I2C with 16 x 2 module.For that i used I2C scanner program to determine the address and also it is connected or not.So please refer the following code that scan the the I2C-bus for devices.If a device is found, it is reported to the Arduino serial monitor.Refer from https://playground.arduino.cc/Main/I2cScanner/
// This sketch tests the standard 7-bit addresses
// Devices with higher bit address might not be seen properly.
while (!Serial); // Leonardo: wait for serial monitor
byte error, address;
nDevices = 0;
for(address = 1; address < 127; address++ )
// The i2c_scanner uses the return value of
// the Write.endTransmisstion to see if
// a device did acknowledge to the address.
error = Wire.endTransmission();
if (error == 0)
Serial.print("I2C device found at address 0x");
else if (error==4)
Serial.print("Unknown error at address 0x");
if (nDevices == 0)
Serial.println("No I2C devices found\n");
delay(5000); // wait 5 seconds for next scan
Upload the above code into the your microcontroller board
The found address will be seen on serial monitor
I2C Device is found as address 0x27
Used this address in your LCD program
Step 2.Program to Display LM 35 sensor data to LCD display (This code will be diferent for you)
LiquidCrystal_I2C lcd(0x27,2,1,0,4,5,6,7); // 0x27 is the I2C bus address for an unmodified backpack
const int sensor=PC2; // Assigning analog pin A1 to variable 'sensor'
float tempc; //variable to store temperature in degree Celsius
float tempf; //variable to store temperature in Fahreinheit
float vout; //temporary variable to hold sensor reading
pinMode(sensor,INPUT); // Configuring pin A1 as input
tempc=vout; // Storing value in Degree Celsius
tempf=(vout*1.8)+32; // Converting to Fahrenheit
lcd.print("in DegreeC= ");
delay(1000); //Delay of 1 second for ease of viewing in serial monitor
As a part of group assignment week we need to calculate the power of output device.So i decided to explain about how to measure voltage and currnet.So i explain my co fab mate about the concept of voltage and currnet.
Safety tips for multimeter:
Choose the right meter
Check the meter before used
Examine the test probe
Know the CAT rating
After understanding how to measure the voltage and current i decided to measure the voltage and current on my board and then try to calculate power of LCD display