RobertHeller – Robert Heller

Articles posted by RobertHeller

Sir Top'm Hat gets a new hat and starts
work at Raspberry Pi Junction at Mile Post 314

RobertHeller June 3, 2017 June 3, 2017Model Railroad, Railroad, What's on the bench 0

The hardware I have designed an add on circuit board for the Raspberry Pi to control stall motor turnout motors. This board uses a quad op-amp circuit to drive a quad output transistor to drive the motors. It also features a 74AHCT00 Quad 2-input Nand Gate IC, wired as a…

Model RR signals with an
Arduino, Programming the Arduino

RobertHeller March 1, 2015 December 26, 2018Model Railroad, Railroad, What's on the bench 0

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…

Model RR signals with an
Arduino, Assembling signal targets

RobertHeller March 1, 2015 March 1, 2015Model Railroad, Railroad, What's on the bench 0

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…

Model RR signals with an
Arduino, Signal Driver board cables

RobertHeller February 24, 2015 March 1, 2015Model Railroad, Railroad, What's on the bench 0

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…

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

RobertHeller February 24, 2015 February 24, 2015Model Railroad, Railroad, What's on the bench 0

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…

Model RR signals with an
Arduino, Signal Driver board

RobertHeller February 24, 2015 February 24, 2015Model Railroad, Railroad, What's on the bench 0

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…

Model RR signals with an
Arduino, Introduction

RobertHeller February 24, 2015 February 24, 2015Model Railroad, Railroad, What's on the bench 0

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,…

Amherst Railway Show Last Weekend

RobertHeller January 27, 2014 January 27, 2014Model Railroad, Railroad 0

This gallery contains 15 photos.

I addended the Amherst Railway Show last Saturday. Here are some of the pictures and videos I took.

For Sale: Small Trailer

RobertHeller July 18, 2013 May 29, 2014For Sale, Human Powered Vehicle

For Sale: Small Bicycle or Tricycle trailer I’m selling my homemade trailer (I have ordered a new one from BikesAtWork.com, arrived yesterday). This trailer comes with its own hitch, which is meant to clamp to the rear fork of a recumbent tadpole trike (specifically my TerraTrike Cruiser), but it should…

For Sale: 3 Knobby BMX type cycle tires, 20×1.75

RobertHeller April 9, 2013 May 29, 2014For Sale, Human Powered Vehicle

It is spring and just how are the tires on your BMX rig? Flat? Have they gone off and acquired a religious vocation? If so, I have three only slightly worn tires that should get you up to speed and getting big air in no time. I have three Knobby…

Author: RobertHeller

Sir Top'm Hat gets a new hat and starts
work at Raspberry Pi Junction at Mile Post 314

Model RR signals with an
Arduino, Programming the Arduino

Model RR signals with an
Arduino, Assembling signal targets

Model RR signals with an
Arduino, Signal Driver board cables

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

Model RR signals with an
Arduino, Signal Driver board

Model RR signals with an
Arduino, Introduction

Amherst Railway Show Last Weekend

For Sale: Small Trailer

For Sale: 3 Knobby BMX type cycle tires, 20×1.75

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