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Warning strobe light controller, dual channel

From CaveLab
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 sold, many years ago.
WALU25 with four LED warning lights.

Two channel strobe light controller, using the AVR ATtiny2313 microcontroller. Five flashing patterns that can be selected manually or cycled through. PWM output.

Details

The warning lights controller has two PWM driven outputs, that each can handle a load of 3 amps. It has five sequences, and can be set on a single sequence or to cycle through. When selecting a sequence manually it is stored in EEPROM and continues on power-up. Much of the hardware and software is based on the Emergency strobe light with 33 LEDs project. Can be used to drive Warning lights with 10mm LEDs. Powered by: 9-24V.

Sequences

  1. Flashing with fade
  2. 3 x strobe, pause
  3. Delayed flash
  4. Random pause strobe
  5. Strobe

I/O

Inputs

  1. PD0 Select program
  2. PD1 Run all programs

Outputs

  1. PB3 Channel 1 (PWM)
  2. PB4 Channel 2 (PWM)

LEDs

Pluggable-led-connector-g25oxg.png

Source code

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

Gallery

Schematic drawing

Warning-strobe-light-controller-circuit-pgoj9q.png

Parts list

Qty. Part
1 × AVR ATtiny2313-20PU, DIL-20, 20 MHz, 18 I/Os
1 × Capacitor, aluminium electrolytic, 10 µF, 25V
2 × Capacitor, aluminium electrolytic, 47 µF, 25V
1 × Capacitor, ceramic, 1 nF, 100V
1 × Capacitor, metallized polyester foil, 10 nF, (0.01 µF)
1 × DIL socket, 20-pin, 7.62mm
1 × Enclosure, plastic (1591 FL), 120x65x40mm, flange
1 × Fuse 5x20 mm, 2 A, fast-acting
1 × Fuse holder, open, PCB, 5x20mm
2 × Heatsink, 27.3K/W, 19mm, attachable, TO220
1 × LED 5mm, Red/Green, 2.0 2.1V, 10mA, 100 63mcd, 30°
1 × LED holder 5mm, Black plastic
32 cm2 PCB, stripboard, 100x160mm, 160cm2
1 × Power jack, panel, 2.1mm, plastic housing
2 × Resistor, carbon film, 0.25W, 330 Ω, 5%
3 × Resistor, carbon film, 0.25W, 4.7 kΩ, 5%
2 × Resistor, carbon film, 0.25W, 10 kΩ, 5%
4 × Resistor, metal film, 0.6W, 1 kΩ, 1%
1 × Spacer, round unthreaded, 3mm, Ø6mm, Delrin
3 × Straight pin header, female, Dual row, 2.54mm
8 × Straight pin header, female, Single row, 2.54mm
3 × Straight pin header, male, Dual row, 2.54mm
8 × Straight pin header, male, Single row, 2.54mm
1 × Switch, toggle, 1-pole, micro, on-off-(on)
1 × Switch, toggle, 1-pole, micro, on-on
1 × Terminal block, pluggable, 3.5 mm, 2-pin screw female
5 × Terminal block, pluggable, 3.5 mm, 2-pin vertical male
2 × Transistor, NPN, 100 mA, 45V, 0.5W, BC547B
2 × Transistor, PNP, 3 A, 100V, 40W, BD242C
1 × Voltage regulator +5V, 2 A, L78S05CV
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