📖 Overview This program demonstrates how a PIC microcontroller communicates with an external ADC (Analog-to-Digital Converter) using the SPI protocol. The PIC acts as the SPI Master, sending commands to the ADC and receiving converted digital data.
🔹 Working Principle The analog signal (e.g., from a sensor like temperature, potentiometer, etc.) is applied to the ADC input. The PIC (Master) generates SPI clock (SCK) and sends control bits/commands to the ADC via MOSI. The ADC converts the analog input into a digital value (e.g., 10-bit). The ADC sends the digital data back to the PIC via MISO. The PIC processes this data and can: Display it on an LCD
SPI Pins in PIC MOSI (SDO) → Sends command/data to ADC MISO (SDI) → Receives converted data from ADC SCK → Clock generated by PIC (Master) CS/SS → Selects the ADC device
⚙️ Applications Sensor data acquisition (temperature, pressure, light, etc.) Digital control systems Data logging with PIC Interfacing external high-resolution ADCs (when PIC’s internal ADC is insufficient)