Embedded PIC Module GPC_8A

By: Pmb  06-Dec-2011

LED Flasher Module

This is a specific LED flasher function using the GPC_8A general purpose controller module.

It provides six inputs and directly drives two LEDs which are controlled by the inputs and flashed at two different rates.


  • small size

  • operates from 12V DC
  • six inputs control LED flashing
  • two LED driver outputs (resistors are on-board)
  • LED-A flashes at a rate of 2 pulses per second (0.25 seconds on/off)
  • LED-A flashes at a rate of 1 pulse per second (0.5 seconds on/off)

Connect one or two LEDs and a 12V power source. The normally-open connections, if not used will have to be connected to a 0V common terminal (deactivated).

Switching one of the normally-open terminals to 0V common will start the appropriate LED flashing.

Input 5 is a normally open input that will start both LEDs flashing.

Input 6 is a normally open input that will inhibit (stop) both LEDs. This can be use as a master on/off control and takes priority over all other inputs.

Both N.O. and N.C. inputs and Input 5 must be inactive to stop an LED flashing.

You can wire inputs together to switch them from the same source. The LED - connections can also be connected together for additional effects.


Terminal connections; input end:

    +12V power supply
    0V common for power supply
    Input 1 = normally open, flash LED A at 2 pulses per second
    Input 2 = normally closed, flash LED A at 2 pulses per second
    Input 3 = normally open, flash LED A at 1 pulse per second
    Input 4 = normally closed, flash LED A at 1 pulse per second
    Input 5 = normally open, flash LEDs A and B at their defined rates
    Input 6 = normally open, inhibit both LEDs. (prevents flashing)

Terminal connections; output end:

    not used
    not used
    0V common
    LED B (-)
    LED B (+)
    LED A (+)
    LED A (-)
    0V common


  1. No resistors are required with the LEDs (resistors are on-board).

  2. Inputs are switched to 0V common to activate.
  3. Normally closed inputs must be connected to 0V common to de-activate (prevent flashing).

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