page-fault-in-nonpaged-area / pixel-print

A library to print letters and numbers onto 5x8 LED matrices. (LiteON LTP-2058AG and LTP14058AG)

pixel-print

A library to print letters and numbers onto 5x8 LED matrices. (LiteON LTP-2058AG and LTP14058AG)

Introduction

This library prints letters and numbers onto 5x8 matrix in sequential order.
With an Approx. 300 ms delay between each letter.

Requirements

1. Texas Instruments SN74LS145 BCD-To-Decimal Decoder
2. Texas Instruments SN7404N Inverter
3. Resistor Arrays for LED's

Process

Step 1: Build your circuit :: Row control

• Make sure outputs 0 to 7 from SN74LS145 are wired to SN7404N then into resistor array then into 5x8 matrix.
• We do this because we want only low outputs from the SN74LS145 IC.

• In order words we want to light up only the LED's we need

• Outputs 0 to 7 from SN74LS145 controls the rows of the 5x8

Step 2: Build your circuit :: Column control

• Wire the column control pins into resistor array then into your Raspberry Pi 2

• Column controls do not need inversion because it's easy to control using the Pi.

Step 3: Print!

• Initialize object using led = pixelprint.LEDMatrixControl()
• Print using led.matrixPrint("YOUR TEXT HERE")

--

Pixel-Print Pin Numbers

LiteON 5x8	Raspberry GPIO
Row 1	Pin 5
Row 2	Pin 6
Row 3	Pin 13
Row 4	Pin 19
Row 5	Pin 26
Column 1	Pin 21
Column 2	Pin 10
Column 3	Pin 16
Column 4	Pin 12

IC Datasheets

• SN74LS145 > http://www.ti.com/lit/ds/symlink/sn54ls145.pdf
• SN7404N > http://www.ti.com/lit/ds/symlink/sn74ls04.pdf

LICENSE MIT. See LICENSE file for full details.