Arduino automatic model train (2)

original article 1 and article 2

   I updated the schematic and sketch (software/program) for automatic model train. 

Schematic is

and program wrote by me is controlled_model_train_3a.ino (base sketch was presented in previous article + adjust part from Doz's article Arduino Astronomical Clock (or Arduino Pond Pump Controller!)).

   Using menu, we can change:

- language (english/romanian language), but each can put local language instead romanian, my native language.

- succession of read the sensors, to activate sensor in movement direction

- maximum speed (PWM: 200..255)

- minimum speed (PWM: 25..150), usual 105 i minimum for real motor, 25 is best for leds

- step for speed (PWM: 2..20)

   After system is powered, after welcome messages, you will see STOP! and red led flashing

until is push button from encoder:

- short push: enter in normal mode, in pause

- long push, until a star appear, enter in adjusting menu:

    Steps in menu mode (adjust by encoder rotation+ enter value by pushing value, menu jump to next level):

- language selection, values: 0 - english, 1 - romanian language

- direction ( adjust as display direction to be as in reality):

- order of proximity sensor activation (must be same as direction... if locomotive go forward, sensor from front of locomotive must be activate, etc), value is 0 - normal or 1 - inverse (schematic use just 2 sensors)

- maximum speed (PWM), from 200 to 255 (because maximum PWM at usual Arduino is 255)

- minimum speed (PWM), from 25 to 150, for DC motor typical is 105

- step for speed (PWM), from 2 to 20

After pushing the burton, system enter in normal function, so on display is STOP!

After a short push of button, on display is PAUSE (value changed previousin menu).

Speed increase 

until maximum

proximity sensor from front is actuated and speed decrease

until zero... a little pause

speed increase in backward direction

until maximum

When locomotive in backward movement actuate sensor from back side, speed decrease

untill 0.. pause.. speed increase to forward movement, etc....

    If on display movement is to forward and locomotive goes to backward (upper white leds indicate the direction, also bicolor led: red for backward and white for forward direction)

it need to change the direction ( if is 0 change to 1, if is 1 change to 0)

   After that, it need to check order of proximity sensors... if locomotive goes forward, sensor from front must be actuated... so, you remove locomotive from rail, put finger in front of correct sensor and if BRAKE message apear on display, sensors are correctly choose, if NOT enter in menu and change value for position sensor, if was 0 change to 1 and was 1 change to 0.

    I uploaded Arduino automatic model train (5) video with steps described upper:

Also you can watch  Arduino automatic model train (4) video 

and Arduino automatic model train (3) video

Automatic white/red light for analog locomotive (DC)

 original article

   Most of the simple analog locomotive use DC voltage with normal or reverse polarity, normal polarity go locomotive forward and reverse voltage go locomotive backward.

   I used for test on breadboard a 5mm bicolour led (red/white) LTW30EEDYJA but for 3mm can be used OSRWPA3132A.

   I designed a simple schematic with additional 3 pieces: 2 diodes (1N4007) and a resistor (680Ω..1kΩ):

   For normal polarity for power supply of the analog locomotive white led is on

and for reverse polarity red led is on

   I make movie named automatic white/red light for loco with a 3 pins led: