A cheap external character display for a Raspberry Pi or an old PC without a serial LCD.
Pin P3.2 is mapped to control the ADC's Write (WR) trigger, and P3.3 monitors the ADC's Interrupt (INTR) line to detect completed conversion cycles. at89c2051 projects
A project using infrared (IR) sensors to control fan speed or ON/OFF status. A cheap external character display for a Raspberry