Security keypad with programmable PIN

This module uses an AVR microcontroller to interface a cheap numeric keypad. The PIN code is set by the user and stored in EEPROM. If entered correctly; a one second pulse is sent on either output 1 or 2, depending on the selected mode. A tamper pin will be shorted to 0V when the module is connected. This keypad module is not itself meant to control anything, but it provides trigger signals for other control modules to act upon. It has three LEDs (green, red and alarm) which can be used to convey messages from that other control module. Powered by: 5V.

Read more...

Sound alarm control unit

This simple unit controls three sound signals; beep, siren and buzzer. Each sound signal will only be given once when a new alarm is triggered, the input must remain clear for at least four seconds for that signal to rearm. A beep is given every six minutes if an alarm is active, as a reminder. The sound LED flashes when a sound alarm is active; once for signal 1 (beep), twice for signal 2 (siren) and three times for signal 3 (buzzer), this flashing pattern is repeated.

Read more...

Home power consumption measuring unit

In Norway we have a LED in our home fuse boxes that flashes a defined number of times per kW, this unit measures the home power consumption by counting those pulses. This is calculated into kW and can be read from a computer over the serial interface. In addition to this unit you will need a sensor to read the LED, that is not covered in this project. It is important that this sensor is accurate to get precise values.

Read more...

Alarm disabling unit for production equipment

This module was built for a production equipment at my previous workplace, it made it possible for an operator to silence an alarm without resolving it. Fixing an error could take some time and having the alarm horn sound during that period was very annoying, so many operators removed the alarm relay. This was unfortunate because it was not always put back, so the next alarm situation could go unnoticed. This module would silence the alarm, but still reactive it once the situation had been resolved. Eliminating the need to remove the alarm relay. Powered by: 9-24V.

Read more...

Alarm disabling unit for production equipment with long stop warning

This module was built for a production equipment at my previous workplace, it made it possible for an operator to silence an alarm without resolving it. Fixing an error could take some time and having the alarm horn sound during that period was very annoying, so many operators removed the alarm relay. This was unfortunate because it was not always put back, so the next alarm situation could go unnoticed. This module would silence the alarm, but still reactive it once the situation had been resolved. Eliminating the need to remove the alarm relay. This production equipment was a temperature tester, keeping it running was vital for the temperature to be stable. Powered by: 9-24V.

Read more...

Warning strobe light controller

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 project. Can be used to drive the Warning lights with 10mm LEDs project. Powered by: 9-24V.

Read more...

Emergency strobe light

The emergency strobe light consists of 33 high intensive 5 mm LEDs and control circuit. It has four sequences, and can be set on a single sequence or to cycle through every fifth second. When selecting a sequence manually it is stored in EEPROM and continues on power-up. If an external controlling unit is plugged in; the internal sequences will stop and the external unit is in control. This makes it possible to synchronize multiple units. LEDs are driven by a PWM output, module is powered by 9-24V.

Read more...