DIY flexible keyboard

For the making of a Flexible keyboard, we need an ordinary USB or a wireless keyboard, in my case I use a rigid USB keyboard.



STEP 1:

Find the screws to open the keyboard, its usually at the bottom of the keyboard.

STEP 2:

Find the control board and the flexible circuit layout.

STEP 3:

Cut and remove the control board along with the mounting holes in the keyboard frame.

STEP 3:

Make sure everything works.

Interfacing ADC 0804 with 8051 micro controller

Source Code:

#include<reg51.h>

#define adc P2

sbit load = P1^6;

////0804_adc_pin_details/////

sbit soc = P1^0;//HIGH to LOW gets data from internal registe to pins in adc
sbit rd = P1^1;// LOW to HIGH pulse is given for start of conversion
sbit intr = P1^2;// pin turn LOW when conversion is done

void intserial();
void sendserial(unsigned char dat);
void delay(unsigned int count);
unsigned char get_adc_data();
unsigned char mydata;


/////////////////////////////////////////

void sendserial(unsigned char dat)
{
TI = 0;
SBUF = dat;
while(TI == 0);
}

//////////////////////////////////////////

void intserial()
{
TMOD = 0x21;// timer 1 and 2 @ auto reload mode
TL1 = 253; //9600 baud rate
  TH1 = 253; //9600 baud rate
SCON = 0X50; // 8 bit serial communication
TR1 = 1;
}

////////////////////////////////////////////

unsigned char get_adc_data()
{
rd = 0;
soc = 1;
//delay(10);
rd = 1;
//waits untill adc conversion is over
soc = 0;
//mydata = adc;//copies adc data to mydata
return P2;
}

//////////////////////////////////////////////

void delay(unsigned int count) 
{
int i,j;
for(i=0;i<count;i++)
  for(j=0;j<1000;j++);
}

////////////////////////////////////////////////

void main()
{
intserial();
while(1) // repeats infinite
{
mydata=get_adc_data();
sendserial(mydata);
    if(mydata>51)
       load=0;
  else
load=1;
}
}
///////////////////////////////////////////////