Serial-out Color Sensor. Overview. Features

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Visit us @ www.thearyatechnologies.com Email: aryaprotech@gmail.

com Contact us@ 0253-2512131 Serial-out Color Sensor Overview Color sensor

The detected color is identified as amount of three primary color values namely

Any color can be separated or combined into three primary colors Red, Green,

1 Visit aryaprotech@gmail.com / info@thearyatechnologies.com Contact us@ Serial-out Color Sensor Overview Color sensor identifies primary colors (Red, Green, Blue) and gives serial output of RGB value. It can identify 16.7 million color shades giving RGB contents of detected color. The detected color is identified as amount of three primary color values namely Red, Green and Blue with 8 bit accuracy for each primary color. Any color can be separated or combined into three primary colors Red, Green, and Blue using RGB values. Features Individual RGB Color Detected. Supports Baud rate of 9600 bps. Serial Data Out for RGB values. Works on 5V DC supply. Standard UART Interface. Directly interfaced with any MCU or USB to TTL convertor. 1

2 Applications Object color sensing Robotics for distinguishing/identifying colors Industrial Process Control Ambient light sensing Color Detection & sorting application Specifications Parameter Value Units Remark Working Voltage 5 DC Volts Regulated DC Voltage Current 20 ma - Color Detection Capacity 16.7 millions Output UART baud rate 9600 bps Color Measuring range Nm Response Time 500 ms R=8bit (2^8=256 levels) G=8bit (2^8=256 levels) G=8bit (2^8=256 levels) 256x256x256=16.7 millions shades detection. 8 bit data, no parity, 1 stop bit 2

3 Pin Diagram Pin Pin Name Pin Name +5V Power Supply Regulated 5V supply input TX Transmit Output Output serial data of TTL logic level Gnd Ground Ground level of power supply Principle of Operation The Sensor switches each primary color RGB, one by one and checks intensity of color reflected by the surface of detection. This intensity is converted to 8 bit value. Green surface will strongly reflect green color, while Magenta surface will reflect red & blue color. As the sensor outs all three primary colors, one can easily detect color of object under detection. 3

4 Output Data Format Data containing intensity of primary color will be serially out with baud rate of 9600 bps. It contains 19 bytes. Intensity will be from 0 to 255. For example when blue color is detected, data out is R015G010B185 Here intensity of Blue is 185, while intensity of Red is 15 & intensity of Green is 010. Detail data format is given in table below Byte No Value (ASCII) Description 1 \r Hex value=0x0d Carriage Return Character (Start of packet) 2 R Always R character for Red Color 3 = Always = character Intensity of Red Color out of 255 (here 15) Always Space character 8 G Always G for Green Color 9 = Always = character Intensity of Green Color out of 255 (here 10) Always Space character 14 B Always B for Blue Color 15 = Always = character Intensity of Blue Color out of 255 (here 185) \ n Hex value=0x0a New Line Character (End of packet) 4

h> #define cmdport P2 #define dataport P0 char rcvstr[19]; unsigned char current_byte; char rcvch; unsigned

5 Interfacing with 8051 Microcontroller Code LCD will display intensity of RGB color. Here baud rate setting is Download source code from link #include<reg51.h> #include <string.h> #define cmdport P2 #define dataport P0 char rcvstr[19]; unsigned char current_byte; char rcvch; unsigned int Ri,Gi,Bi; int num[10]; sbit rs = cmdport^6; //register select pin //sbit rw = cmdport^1; // read write pin sbit e = cmdport^7; //enable pin 5

6 void ser_init(void); void Delay250us (void); void MsDelay (int n); void read_clr(void); void lcdcmd(unsigned char item); void lcddata(unsigned char item); void lcdstr(unsigned char *s); void lcdinit(void); void Delay250us (void) int j ; for(j = 0 ; j < 100 ; j ++) void MsDelay (int n) int j ; for(j = 0 ; j < n ; j ++) Delay250us() ; Delay250us() ; Delay250us() ; Delay250us() ; void ser_init(void) current_byte=0; TMOD=0x20; //Timer 1 Mode 2 TH1=-3; // Bouad Rate-9600 SCON=0x52; // 8 bit,1 stop bit TR1=1; // start timer char getclrinfo(void) char c; while(!ri); RI=0; c=sbuf; return SBUF; //Function to 3 Digit display number on LCD void lcdno3d(unsigned int i) int p; unsigned char c; int k=0; while(i>0) 6

7 num[k]=i%10; i=i/10; k++; if (k==0) num[k]=0; k++; num[k]=0; k++; num[k]=0; k++; if (k==1) num[k]=0; k++; num[k]=0; k++; if (k==2) num[k]=0; k++; k--; for (p=k;p>=0;p--) c=num[p]+48; dataport = c; // rw = 0; rs = 1; e = 1; e = 0; return; // Function to read & extract RGB componant void read_clr(void) do rcvch=getclrinfo(); if(rcvch==0x0a) current_byte=0; Ri=((rcvstr[3]-'0')*100)+((rcvstr[4]-'0')*10)+(rcvstr[5]-'0'); Gi=((rcvstr[9]-'0')*100)+((rcvstr[10]-'0')*10)+(rcvstr[11]-'0'); Bi=((rcvstr[15]-'0')*100)+((rcvstr[16]-'0')*10)+(rcvstr[17]-'0'); 7

8 else rcvstr[current_byte]=rcvch; current_byte++; while(rcvch!=0x0a); TR1=0; //value of Ri,Gi,Bi will be between //write logic as per your requirement lcdcmd(0xc0); lcdno3d(ri); lcdcmd(0xc5); lcdno3d(gi); lcdcmd(0xcb); lcdno3d(bi); //Function to send command to LCD void lcdcmd(unsigned char item) dataport = item; rs= 0; //rw=0; e=1; e=0; //Function to send data to LCD void lcddata(unsigned char item) dataport = item; rs= 1; //rw=0; e=1; e=0; //Function to display string void lcdstr(unsigned char *s) unsigned char l,i; l = strlen(s); // get the length of string for(i=1;i<=l;i++) lcddata(*s); // write every char one by one s++; 8

9 //Function to initialise LCD void lcdinit(void) lcdcmd(0x38); // for using 8-bit 2 row mode of LCD MsDelay(10); lcdcmd(0x0e); // turn display ON for cursor blinking MsDelay(10); lcdcmd(0x01); //clear screen MsDelay(10); lcdcmd(0x06); //display ON MsDelay(10); void main() current_byte=0; strcpy(rcvstr,""); lcdinit(); MsDelay(10); lcdcmd(0x80); MsDelay(10); lcdstr("color Sensor"); lcdcmd(0xc0); MsDelay(10); lcdstr("interface"); MsDelay(100); lcdcmd(0x01); lcdcmd(0x80); lcdstr("r G B"); while(1) ser_init(); read_clr(); 9

10 Interfacing with PC To interface with PC voltage level convertor Max232 is required. 10

11 Code Code is written invb.net 2010 for reading data from color sensor & extract primary colors RGB. Here baud rate setting is 9600 bps. Download source code from link 11

12 Public Class RGB Private _msg As String Dim R As String Dim G As String Dim B As String Dim ir As String Dim ig As String Dim ib As String Private indata As String Dim IsConnected As Boolean Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load For Each str As String In IO.Ports.SerialPort.GetPortNames() Ports.Items.Add(str) Next If (Ports.Items.Count > 0) Then Ports.SelectedIndex = 0 End If IsConnected = False Status.Text = "Disconnected" Status.BackColor = Color.LightPink Button1.Enabled = True Button2.Enabled = False Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click If (SerialPort1.IsOpen()) Then Try SerialPort1.Close() Catch ex As Exception MsgBox(ex.Message) End Try IsConnected = False Status.Text = "Disconnected" Status.BackColor = Color.LightPink Button1.Enabled = True Button2.Enabled = False End If Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click If (SerialPort1.IsOpen = False) Then SerialPort1.PortName = Ports.SelectedItem SerialPort1.Open() IsConnected = True Status.Text = "Connected" Status.BackColor = Color.LightGreen Button1.Enabled = False 12

13 Button2.Enabled = True End If Private Sub SerialPort1_DataReceived(ByVal sender As System.Object, ByVal e As System.IO.Ports.SerialDataReceivedEventArgs) Handles SerialPort1.DataReceived Try Dim msg As String = SerialPort1.ReadExisting() indata = indata + msg Dim where As Integer = InStr(indata, "R=") If (indata.length > where + 18) Then R = indata.substring(where + 1, 3) G = indata.substring(where + 7, 3) B = indata.substring(where + 13, 3) indata = "" End If 'display the data to the user _msg = msg _msg = _msg.replace(controlchars.cr, "") : DisplayData(msg) Catch ex As Exception End Try #Region "DisplayData" ''' <summary> ''' Method to display the data to and ''' from the port on the screen ''' </summary> ''' <remarks></remarks> <STAThread()> _ Private Sub DisplayData(ByVal msg As String) Display_Data.BeginInvoke(New EventHandler(AddressOf DoDisplay)) #End Region #Region "DoDisplay" Private Sub DoDisplay(ByVal sender As Object, ByVal e As EventArgs) Display_Data.AppendText(_msg) Display_Data.ScrollToCaret() #End Region 13

14 Private Sub Timer1_Tick(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Timer1.Tick RL.Text = R GL.Text = G BL.Text = B ir = CInt(R) ig = CInt(G) ib = CInt(B) Try Label6.BackColor = Color.FromArgb(CType(iR, Byte), CType(iG, Byte), CType(iB, Byte)) Catch ex As Exception End Try Private Sub cmdexit_click(byval sender As System.Object, ByVal e As System.EventArgs) Handles cmdexit.click Application.Exit() End Class 14

LABORATORY MANUAL EMBEDDED C LABORATORY. M. Tech I Year I Sem R13 DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGG.

LABORATORY MANUAL EMBEDDED C LABORATORY M. Tech I Year I Sem R13 DEPARTMENT OF ELECTRONICS & COMMUNICATION ENGG. BALAJI INSTITUTE OF TECHNOLOGY & SCIENCE Laknepally, Narsampet, Warangal 1 M.TECH. (EMBEDDED