Stack lights and horn controller

This page is kept for historical interest. It may document projects or methods that are obsolete and/or no longer relevant. The information here is not kept up-to-date.

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

A control module for a green, yellow and red stack light, and signalling horn.

Details

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.

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

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

Gallery

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  Complete

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  Complete inside

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  Testing with Simulation 6 I/O

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  Box

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  Stack lights

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  Yellow and red strobe

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  LTCU installed in the Rack box

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  External power transistors

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Schematic drawing