Parallax P2 Eval LED Matrix Add-On Board

Description Parallax P2 Eval LED Matrix Add-On Board Equipped with 56 Charlieplexed green LEDs Requires only 8 I/O pins for full LED control Features a pass-through socket for easy stacking Assembled and tested in Rocklin, California The Parallax P2 Eval LED Matrix Add-On Board is equipped with an 8 x 7 grid of Charlieplexed green LEDs. This board is designed to be used with Propeller 2 multicore microcontroller projects, enabling the display of text or graphics across 56 LEDs using a mere 8 I/O pins. The board utilizes Charlieplexing, a technique that controls a larger number of LEDs with fewer I/O pins. This is achieved by leveraging the one-way current flow properties of diodes, including Light Emitting Diodes, in conjunction with the tri-state properties of the Propeller 2 I/O pins. The board does not light multiple LEDs simultaneously but rather switches them on and off rapidly enough to create the illusion of simultaneous illumination to the human eye. This is achieved when the Propeller 2 code switches each LED on and off at least 50 times per second (50 Hz), resulting in a flicker-free appearance and the illusion of the LEDs being permanently on. The Propeller 2 is capable of switching at speeds faster than 180 MHz, providing ample time to activate every LED if necessary. The Parallax P2 Eval LED Matrix Add-On Board also includes a pass-through socket that stacks on top of a 2x6 accessory header on the Propeller 2 Evaluation Board. Additionally, it is compatible with a P2 Edge Module Breadboard or a P2 Edge Mini Breakout Board with a P2 Edge Module installed. View more What's Included 1x Parallax P2 Eval LED Matrix Add-On Board Dimensions 1.6 x 0.8 inch / 4.1 x 2 cm Links PDF Files Parallax P2 Eval LED Matrix Add-On Board - Guide Parallax P2 Eval LED Matrix Add-On Board - Schematics Website P2 Eval LED Matrix Add-on Board - Propeller 2 Repository Specifications 56 LEDs in an 8 x 7 grid Only requires 8 Propeller 2 I/O pins for full LED control Total current consumption is 4 mA, thanks to Charlieplexing See the Product Guide download for I/O pin assignments and lookup table showing the I/O pin states for controlling each LED Product guide, RoHS CE and UKCA Declarations of Conformity are available under the Downloads tab PCBs assembled, tested, and completed in Rocklin, California