model railroad electronics

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  • Overview
    • Background
    • Toyama Light Rail, the prototype
    • Toyama Light Rail, the models
    • Track plan
  • Throttles
    • Background
    • Motor controller hardware
    • Motor controller software
  • Throttles — Implementation
    • Overview
      • Throttle System Units
        • Throttle Unit
        • Controller Unit
        • Power Monitor Unit
  • Switch Machine Controllers
    • Background
    • Switch machines
    • Hardware
      • Update
      • Another update
    • Schematics
    • Driver Module printed circuit boards
    • Software
    • Special note: I2C over servo wire
  • Block switching
    • Background
    • What about those turnouts?
    • Switching a single block
    • Switching multiple blocks
    • Hardware
      • Block addressing logic
      • Relay decoder/driver
      • Relay module
      • Connection to control processor
    • Software
    • Timing requirement for relays
  • Track Sensors
    • Background
    • Sensors
    • Controllers and nodes
      • Sensor nodes
      • Sensor controllers
    • Sensor network
    • Software
      • Sensor nodes
      • Sensor controller
  • Trackside Signals
    • Background
    • Color-Light Signals
    • Obstruction-Warning Signals
  • Notes on Interfaces
    • Daisy-chaining SPI devices
    • I2C over servo cable
    • UDP network communications
  • Railroad Turntable
    • Background
    • Modeling the turntable
    • Trackage
    • Drive mechanism
    • Position indexing
  • Turntable Calculations
    • Background
    • Calculations
    • Python code
  • Microstepping a stepper motor
  • Train Speedometer — Basics
    • Background
    • What you need
      • Scale factor
      • Units of speed
      • Sensors
      • Sensor separation
      • Elapsed time between sensor detections
    • Basics of operation
    • Calculating scale speed
  • Train Speedometer — Implementation
    • Background
    • Hardware
    • Setup
    • Operating the speedometer
      • Detect a train
      • Compute the train’s speed
      • Display the speed
    • Testing the speedometer
  • T-TRAK Module Wiring
  • (archive) Arduino Day 2017 in Rockville, Maryland
  • (archive) Switch Machine Controllers – version 1
  • (archive) Arduino Days 2025 event in Ashland, Virginia
  • mobile
  • Overview
    • Background
    • Toyama Light Rail, the prototype
    • Toyama Light Rail, the models
    • Track plan
  • Throttles
    • Background
    • Motor controller hardware
    • Motor controller software
  • Throttles — Implementation
    • Overview
      • Throttle System Units
        • Throttle Unit
        • Controller Unit
        • Power Monitor Unit
  • Switch Machine Controllers
    • Background
    • Switch machines
    • Hardware
      • Update
      • Another update
    • Schematics
    • Driver Module printed circuit boards
    • Software
    • Special note: I2C over servo wire
  • Block switching
    • Background
    • What about those turnouts?
    • Switching a single block
    • Switching multiple blocks
    • Hardware
      • Block addressing logic
      • Relay decoder/driver
      • Relay module
      • Connection to control processor
    • Software
    • Timing requirement for relays
  • Track Sensors
    • Background
    • Sensors
    • Controllers and nodes
      • Sensor nodes
      • Sensor controllers
    • Sensor network
    • Software
      • Sensor nodes
      • Sensor controller
  • Trackside Signals
    • Background
    • Color-Light Signals
    • Obstruction-Warning Signals
  • Notes on Interfaces
    • Daisy-chaining SPI devices
    • I2C over servo cable
    • UDP network communications
  • Railroad Turntable
    • Background
    • Modeling the turntable
    • Trackage
    • Drive mechanism
    • Position indexing
  • Turntable Calculations
    • Background
    • Calculations
    • Python code
  • Microstepping a stepper motor
  • Train Speedometer — Basics
    • Background
    • What you need
      • Scale factor
      • Units of speed
      • Sensors
      • Sensor separation
      • Elapsed time between sensor detections
    • Basics of operation
    • Calculating scale speed
  • Train Speedometer — Implementation
    • Background
    • Hardware
    • Setup
    • Operating the speedometer
      • Detect a train
      • Compute the train’s speed
      • Display the speed
    • Testing the speedometer
  • T-TRAK Module Wiring
  • (archive) Arduino Day 2017 in Rockville, Maryland
  • (archive) Switch Machine Controllers – version 1
  • (archive) Arduino Days 2025 event in Ashland, Virginia
  • mobile

model railroad electronics

Skip to content
  • Overview
    • Background
    • Toyama Light Rail, the prototype
    • Toyama Light Rail, the models
    • Track plan
  • Throttles
    • Background
    • Motor controller hardware
    • Motor controller software
  • Throttles — Implementation
    • Overview
      • Throttle System Units
        • Throttle Unit
        • Controller Unit
        • Power Monitor Unit
  • Switch Machine Controllers
    • Background
    • Switch machines
    • Hardware
      • Update
      • Another update
    • Schematics
    • Driver Module printed circuit boards
    • Software
    • Special note: I2C over servo wire
  • Block switching
    • Background
    • What about those turnouts?
    • Switching a single block
    • Switching multiple blocks
    • Hardware
      • Block addressing logic
      • Relay decoder/driver
      • Relay module
      • Connection to control processor
    • Software
    • Timing requirement for relays
  • Track Sensors
    • Background
    • Sensors
    • Controllers and nodes
      • Sensor nodes
      • Sensor controllers
    • Sensor network
    • Software
      • Sensor nodes
      • Sensor controller
  • Trackside Signals
    • Background
    • Color-Light Signals
    • Obstruction-Warning Signals
  • Notes on Interfaces
    • Daisy-chaining SPI devices
    • I2C over servo cable
    • UDP network communications
  • Railroad Turntable
    • Background
    • Modeling the turntable
    • Trackage
    • Drive mechanism
    • Position indexing
  • Turntable Calculations
    • Background
    • Calculations
    • Python code
  • Microstepping a stepper motor
  • Train Speedometer — Basics
    • Background
    • What you need
      • Scale factor
      • Units of speed
      • Sensors
      • Sensor separation
      • Elapsed time between sensor detections
    • Basics of operation
    • Calculating scale speed
  • Train Speedometer — Implementation
    • Background
    • Hardware
    • Setup
    • Operating the speedometer
      • Detect a train
      • Compute the train’s speed
      • Display the speed
    • Testing the speedometer
  • T-TRAK Module Wiring
  • (archive) Arduino Day 2017 in Rockville, Maryland
  • (archive) Switch Machine Controllers – version 1
  • (archive) Arduino Days 2025 event in Ashland, Virginia
  • mobile

Recent Posts

  • Added Microstepping page
  • Train Speedometer YouTube posted
  • Train Speedometer pages added
  • Updates to Turntable pages
  • UDP-with-echo updated

Archives

  • November 2023
  • October 2023
  • March 2023
  • January 2023
  • December 2022
  • November 2022
  • June 2022
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  • February 2022
  • October 2020
  • May 2020
  • March 2020
  • October 2019
  • January 2019
  • January 2018
  • August 2017
  • April 2017
  • March 2017
  • January 2017
  • August 2016
  • July 2016
  • June 2016
  • May 2016
  • April 2016
  • February 2016
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MODEL RAILROAD ELECTRONICS

(mobile device version)

Blog Posts

Main Menu

  • OVERVIEW
  • THROTTLES
  • THROTTLES – IMPLEMENTATION
  • SWITCH MACHINE CONTROLLERS
  • BLOCK SWITCHING
  • TRACK SENSORS
  • TRACKSIDE SIGNALS
  • NOTES ON INTERFACES
  • RAILROAD TURNTABLE
  • TURNTABLE CALCULATIONS
  • MICROSTEPPING A STEPPER MOTOR
  • TRAIN SPEEDOMETER – BASICS
  • TRAIN SPEEDOMETER – IMPLEMENTATION
  • T-TRAK MODULE WIRING

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