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I am currently doing a mini-project on temperature sensor using 8051 micro-controller. The 8051 micro-controller will receive 8bit temperature data from Analogue-to-Digital Converter which is connected to a temperature sensor(eg. LM35) I have a problem in translating the 8bit data from ADC to a temperature reading (eg. 38 celcius)in keil. I hope to understand the structure or the procedure in carrying out this step. Thank you!
"which port would i acquire the 8bit data because the AT89C52 have 4 port?" You choose!
Below is the C prog. I notice that the problem is lies with "OPORT = instr;" because it suppose to move what is in instr into OPORT which is in Xdata at location 0000h but it did not. #include <reg51.h> void delay5ms(void); void delay1ms(void); void lcdWriteInstrReg(char instr); void lcdInit(void); void lcdClrScr(void); char xdata OPORT _at_ 0x0000; sbit pinRW = P3^3; sbit pinRS = P3^4; sbit pinE = P3^5; void main(void) { lcdInit(); while(1); }//end main void lcdWriteInstrReg(char instr) { OPORT = instr; //o/p to D0-D7 pinRW = 0; //write pinRS = 0; //RS=0 for instr Reg pinE = 0; pinE = 1; pinE = 0; } void lcdInit(void) { delay5ms(); delay5ms(); delay5ms(); delay5ms(); lcdWriteInstrReg(0x38); delayms(); lcdWriteInstrReg(0x38); delay1ms(); lcdWriteInstrReg(0x38); delay1ms(); lcdWriteInstrReg(0x06); delay1ms(); lcdWriteInstrReg(0x0f); delay1ms(); lcdClrScr(); } void lcdClrScr(void) { lcdWriteInstrReg(0x01); delay1ms(); delay1ms(); }
Make OPORT volatile. Stefan
void main(void) { char ebit,ans; ebit = 0x01; ans = ebit*(100/256); } how can i display the value in ans on LCD ? void lcdPutStr (char *string) { char i; i=0; while(string[i]) { lcdPutCh (string[i++]); } } this is the program segment for putting the characters into LCD.