Seven segment LED displays are brighter, more attractive, and provide a far viewing distance as well as a wider viewing angle compared to LCD displays. This project describes a serial seven segment LED display shield for chipKIT Uno32 or compatible boards. The shield consists of eight 0.56″ seven segment displays that are driven by one MAX7219 chip. The shield also features a light dependent resistor (LDR) to implement adaptive brightness control to the LED displays. The chipKIT Uno32 board can sense the surrounding illumination level by reading the LDR output through A0 or A1 analog input channel, and use that information to adjust the brightness of the LED displays. A demo code and Eagle CAD files are also provided.
BME280 is a fully integrated environmental unit from Bosch that combines sensors for pressure, humidity, and temperature into a single tiny 8-pin metal-lid LGA package. Because of its compact size, ease of use (BME280 supports standard I2C and SPI interfaces), and availability of supporting open-source Arduino libraries, BME280 is very popular among hobbyists and weather enthusiasts.
This project describes how to read barometric pressure, relative humidity, and temperature measurements from BME280 using a chipKIT Uno32 to make a standalone weather station. The sensor readings are acquired over an I2C bus and are displayed on a Nokia 5110 LCD display.
I have just finished writing up a new tutorial on using the Nokia 5110 graphical LCD with the chipKIT platform. Nokia 5110 LCD was used in Nokia’s popular 5110 and 3310 model cell phones and is a very popular display among the Arduino community because of its low cost (~$3 on eBay). It is a 48×84 pixels matrix LCD driven by the low-power PCD8544 controller chip. It is powered by 3.3V and includes on-chip generation of LCD supply and bias voltages, thus requiring minimum external components for its operation. This tutorial explores the PCD8544 serial bus interface and its connection with chipKIT Uno32 board for displaying text, graphics, and bitmap.