At89c2051 Projects !exclusive!

15 programmable pins split between Port 1 and Port 3. Timers: Two 16-bit timers/counters.

Advanced frameworks optimize processing speeds while fully leveraging special hardware modules like internal analog comparators and dedicated UART interfaces. at89c2051 projects

Microcontroller I/O pins cannot source enough current to activate relay coils directly. Connect pin P1.3 and pin P1.4 to the base terminals of two discrete 1N4007 flyback diode-protected ULN2003 driver arrays or independent 2N2222 NPN switching transistors. These switch 12V external power safely through the coils of the output relays. Complete Control Firmware Code (Embedded C) 15 programmable pins split between Port 1 and Port 3