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    Hi, everyonr!
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    Hello I need help on C Program compiler : keil mcu: P89V51R1D2 I am seeing following error Build target 'Target 1' compiling LED.c... LED.c(1): warning C318: can't open file 'regx51.h' ...
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    i want to interface GSM modem with 8051 microcontroller with yhe use of RS232 so plese give me connection diagram and discription of this inter facing. also discription of AT command set is required...
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    for beginners 89c51 is not advisable. better to use very easy 89v51xx chips which have ISP through UART means you need only a max232 ic between the microcontroller and the computer. for more about this...
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    #define A 100 void main() { int b=0; int c=30; while(1) { b++; if(b>1000) b=0; if(abs(b-c)>10) { #ifdef A #undef A #define A 200 #endif print("A1= %d",A); } else { #ifdef A #undef A...