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Model RR signals with an
Arduino, Programming the Arduino

The code to download to the Arduino is in available for download as SignalDriverMax72xx_Ardunio.zip. It uses the LedControl library, so the code starts by including the header file: #include <LedControl.h> Then since it is using scanf() and various string function, it includes stdio.h and string.h: #include <stdio.h> #include <string.h> Then it allocates a LedControl object: […]

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Model RR signals with an
Arduino, Assembling signal targets

The next step is to assemble the signal targets. I used 2mm x 1.25mm chip LEDs, made by Osram and sold by Mouser (part numbers Green: 720-LGR971-KN-1, Yellow: 720-LYR976-PS-36, and Super Red: 720-LSR976-NR-1). These are $.10 each in single quantities and the price goes down to about five and a half cents each in quantities […]

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Model RR signals with an
Arduino, Signal Driver board cables

Nine conductor ribbon cables (DigiKey part number MC09G-25-ND) is used to connect between the Signal Driver Board and the signals. One end gets a 9-pin header plug and the other end gets a small circuit board with small screw terminals. The actual LEDs in the signals are connected to wire wrap wire, but wire wrap […]

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Model RR signals with an
Arduino, Connecting the Signal Driver Board

The Signal Driver board is connected with a home made connector cable. The cable is a six conductor ribbon cable (DigiKey part number MC06G-25-ND). One end of the cable is attached to a 6-pin .1 inch (2.54mm) IDC header plug and the other end connected to a "plug" made from a small piece of strip-board […]

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Model RR signals with an
Arduino, Signal Driver board

The Signal Driver board is assembled on a piece of "strip board", specifically a 3.5 inch by 2.5 inch piece cut from a BusBoard Prototype Systems BPS-MAR-ST6U-001 (included in the Mouser project). After cutting this piece from the board some of the copper foil needs to be carefully removed. This is done with a sharp […]

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Model RR signals with an
Arduino, Introduction

I will be building an interlocking plant module with 5 two-headed signals. To drive all of these signals I will be using an Arduino and a Max72XX Led driver (see http://playground.arduino.cc/Main/MAX72XXHardware for more information about general uses for the Arduino and the Max72XX chips). This article describes the hardware involved, the firmware (software on the […]

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PHP and WordPress Plugins

I have recently been writing some WordPress plugins. It has been an interesting experience. Not terribly hard. I’ve now written three plugins. One implements a database table for Google Affiliate Network advertisements and implements "sidebar" widgets to display them. Another implements a pair of database tables that implement the season schedule and open mic schedule […]

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