Read a potentiometer using the on-chip comparator (P3.6 and P1.1) to adjust duty cycle.
void send_string(char *s) while(*s) SBUF = *s++; while(!TI); TI = 0; at89c2051 projects
Introduction: Why the AT89C2051 Still Matters In the modern era of ARM Cortex, ESP32, and Raspberry Pi, it’s easy to overlook the humble 8-bit microcontroller. However, the AT89C2051 from Atmel (now Microchip) remains a beloved IC for hobbyists, students, and educators. Why? Because it is simple, cheap, robust, and comes in a 20-pin DIP package that is breadboard-friendly. Read a potentiometer using the on-chip comparator (P3
void main() // Configure Timer0 in mode 1 TMOD The system waits a random delay (1-5 seconds)
void main() while(1) P1_0 = 0; // LED ON (assuming common cathode) delay_ms(500); P1_0 = 1; // LED OFF delay_ms(500);
Test your reaction speed. The system waits a random delay (1-5 seconds) after pressing "start", then lights an LED and starts a timer. The player presses "response" as quickly as possible; the timer stops and the reaction time is displayed (via serial or LEDs). Use P3.0 (RXD) and P3.1 (TXD) to send data to a PC terminal (9600 baud).