Stack lights and horn controller

From CaveLab
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This module was part of the rack box project — which was terminated when I moved out of my first apartment.
LTCU installed in the Rack box

This is the Rack box alarm handling unit. It controls the stack light, strobes and horn. Six different signals can be displayed, according to alarm situation. If mute is active no signals is given. The power transistors for the stack light used to be located inside the module, hence the heat-sink. They have been moved to a separate power transistor unit.

Video

Signals

Nr Situation Green Yellow Red Strobe Horn Horn w/muted
1 Flashing 0.1 s
2 Rack temp Steady Flashing Yellow 1 s
3 SIOS alarm Flashing Yellow 1 s
4 Serial offline Flashing Steady Yellow 1 s 0.1 s
5 Module offline Steady Flashing Red 1 s 0.1 s
6 Supply error Flashing Red 1 s 0.1 s

I/O

Inputs

  1. Signal 1
  2. Signal 2
  3. Signal 3
  4. Signal 4
  5. Signal 5
  6. Signal 6
  7. Mute

Outputs

  1. Stack light green
  2. Stack light yellow
  3. Stack light red
  4. Strobe yellow
  5. Strobe red
  6. Horn
  7. Lifesignal (to Module stability monitoring unit 2)
  8. Lifelight

D-Sub 25-pin

  1. +5V
  2. 0V
  3. Strobe yellow
  4. Strobe red
  5. Horn
  6. Lifesignal
  7. Signal 1
  8. Signal 2
  9. Signal 3
  10. Signal 4
  11. Signal 5
  12. Signal 6
  13. Mute signal
  14. Stack light green
  15. Stack light yellow
  16. Stack light red

Source code

Git-alt-brands.svg
Bascom-AVR source is available in a git repository:
https://github.com/thomasjsn/AVR-Stack-lights-controller

Gallery

Schematic drawing

Stack-lights-and-horn-controller-circuit-49lve4.png

Parts used

Qty. Part
1 × AVR ATtiny2313-20PU, DIL-20, 20 MHz, 18 I/Os
1 × Capacitor, aluminium electrolytic, 10 µF, 25V
2 × Capacitor, ceramic, 22 pF, 100V
1 × Capacitor, ceramic, 1 nF, 100V
1 × D-sub soldering cups, 25 pin male
1 × DIL socket, 20-pin, 7.62mm
1 × Enclosure, plastic (1591 FL), 120x65x40mm, flange
1 × Fuse 5x20 mm, 400 mA, fast-acting
1 × Fuse holder, open, PCB, 5x20mm
1 × Fuse holder, open, PCB, Protective cover
1 × Heatsink, 6K/W @ 10W, 37.5mm 49g
1 × LED 5mm coloured clear, Green, 2.1V, 20mA, 30mcd, 10°
1 × LED 5mm, Green, 2.0V, 10mA
1 × LED 5mm, Orange, 2.0V, 20mA
1 × LED 5mm, Red, 2.0V, 20mA
1 × LED holder 5mm, RTC51, black plastic
96 cm2 PCB, stripboard, 100x160mm, 160cm2
1 × Quartz crystal oscillator, 4 MHz
11 × Resistor, carbon film, 0.25W, 330 Ω, 5%
8 × Resistor, carbon film, 0.25W, 4.7 kΩ, 5%
7 × Resistor, carbon film, 0.25W, 10 kΩ, 5%
7 × Transistor, NPN, 100 mA, 45V, 0.5W, BC547B