The driver for the RGB LED Matrix drives two rows of RGB LEDs at a time.
WiFi dongles and adapters are cheap, but when you add it to the cost of the Raspberry Pi you might as well buy the RPiW. Why use a $35.00 Pi when a $10.00 Pi will do the job? If you do not use an RPiW then you will need to add a USB WiFi dongle and possibly an adapter to convert it to micro USB. You may have to leave out the unused GPIO headers or swap them for right angle headers. However, if used with a Raspberry Pi other than an RPiW there may be interference issues. My Hub75 interface board will work with any Raspberry Pi with a 40 pin GPIO header. Except for the matrix driver library, all the coding was done using Python. An optional 3.3V regulator can be added if you need more power for peripherals. The I2C and Console (Serial) ports are also broken out. My board has all of the GPIO pins not used to drive the matrix broken out to headers. I chose to design my own board to mate with a Raspberry Pi Zero W (RPiW). I chose to limit it to one display with a maximum of 32 rows.Īdafruit sells a HAT for the Raspberry Pi for controlling a Hub75 RGB LED matrix. The driver library used can handle longer displays (more columns or fewer columns) and can drive up to three displays. This type of matrix can be purchased from Adafruit or on Ebay. The matrix has 32 rows with 64 columns of RGB LEDs. I used a 32圆4 pixel matrix with 4mm density (P4-64x32-16S). The Hub75 interface defines the connector used, the signals used and the wiring. For this project you will need an RGB LED matrix with a Hub75 (the most common) interface. If you are too close then your eye will not blend the pixels properly. The lower the 'P' number, the closer you can view the display. P4 refers to a display with 4mm spacing between the RGB LEDs. The pixel density of a display is stated by a 'Pn' designation. Pixel density refers to how close the RGB LEDs are to each other. Pixel size refers to the number of rows and columns of RGB LEDs.
RGB LED matrices come in a variety of pixel sizes, pixel densities and interface configurations. Everything else is obtained from various web sites. xml files that you can edit to add the birthdays, holidays and greetings of your choice. The birthday and holiday greetings are read from two. A BME280 environmental sensor array is used to obtain temperature, humidity and barometric pressure information. The lower row shows jokes, quote of the day, weather information, environment information, headlines, birthday greetings and holiday greetings. The upper row shows current time and date. The sign scrolls information on two rows. This project is for a Raspberry Pi controlled scrolling sign using a 32圆4 matrix of RGB LEDs.
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