Automatic Railway Crossing system

original article

   `A schematic for an automatic railway crossing system:

I wrote a sketch for control 2 servos, warning ligts and sounds: doublebarriers_5.ino. As any Arduino fans knows, sounds and servo (using Tone and Servo libraries) not work simultanieous, but I used a trick, I activate servo when I want movements, deactivate the servo when I need sounds.

   When any IR sensor modules is actuated (LOW level) servos close the gates, red leds flash and speaker sound as in video double barriers with sound and lights (4)

or automatic barriers for diorama

    When railway is free gates are open, white led flashing.

   As I presened in previous post, Dragos (albasete) test sketch for real diorama, so:

  - barriers:

- warnings (sounds)

Railway Crossing system with manual control

original article

   I'm beginner as railways diorama, but I want to help the passionate peoples.

   First project with railway crossing system was for a manual control. 

   System control 2 servos with warning lights and sounds.

   Test schematic is

and program (sketch) is doublebarriers_3a7.ino.

    Real system created by my is on breadboard:

but Dragos (albasete) work more professional:

   I uploaded a short video named double barriers with sound and lights

0-30V/0-7A Power Supply Unit with LM723 and Arduino volt & ampermeter

original article (in romanian language)

   Dragos, known under albasete name from elforum (romanian electronic forum) made an useful power supply unit. Schemtic used by albasete is

   Original schemtic is from Reber electronic site (3A NAPAJALNIK NASTAVLJIV OD 1V DO 27V article). Also, I found same data in article 1V-27V 3A Variable DC Power Supply (http://powersupply33.com/).

  For measure voltage and current it use info from Arduino ca multimetru (3). It use existing resistor for measure current (R5) and add 2 resistor as divider resistor for measure voltage:

   Using original PCB board, I draw connexion to Arduino board:

   It use an Arduino nano board with i2c LCD1602 display, a active buzzer for indicate shortcircuit case. Also, I put DS18B20 temperature sensor and relay for power a cooler when tenmperature is bigger than a threshold level.

   For albasete version, I write psu_reber_ver3ro.ino sketch. In this sketch I put value for albasete case (R1 = 1k put between GND and A1 port, R2 = 39k put between +OUT and A1)

and value for threshold (temax) and hysteresis value (dete):

   Now, I put few photo pictures of realization progress:

   Dragos (albasete) send me a movie with PSU in tests: 0-30V/0-7A PSU with LM723 and Arduino volt & ampermeter