Archives for June, 2013
The SPI or Serial Peripheral Interface is a synchronous serial communication and allows multiple devices to communicate with a micocontroller(s). There are many devices that support the SPI protocol and can easily communicate with a microcontroller via SPI: A/D converters, D/A converters, SD Cards, DS1306 Real Time Clocks, MAX7219 serial display drivers, 25LC256 Serial EEPROM, etc. The devices don't have to be identical as long as they support SPI protocol. In this article we are going to configure the SPI Peripheral with MPLAB Code Configurator and PIC18F Peripheral Library.
The MPX4115A is an atmospheric pressure sensor powered by 5V and delivers and output from ~0.25V to ~4.75V based on the pressure detected at room temperature (25°C). The device provides a linear output based on pressure. It can measure pressures between 15kPa and 115kPa. Note that 1 atmosphere of pressure at sea level is equal to 101,325 Pa or 101 kPa. This sensor is ideal for microcontroller based barometer, altimeter, data logger or weather station applications. In this article, we're gonna create a simple Digital Barometer using MPLAB XC8 compiler.