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Night Light Saver V3.2 using PIC12C508

Efficiently save energy with Night Light Saver V3.2 using PIC12C508. Illuminate your space smartly and sustainably!

Tags: #night-light#pic12c508
Ibrar Ayyub By Ibrar Ayyub
Published
Updated

At a glance

CategoryHome Automation & Security
PIC modelPIC12C508
Reading time~3 min

Summary of Night Light Saver V3.2 using PIC12C508

The SAVER V3.2 is a night-light controller built around a PIC12C508 microcontroller and a small triac (MAC97A6). It uses a transformerless capacitive dropper power supply, a 5.1V zener regulator, a 32 kHz crystal, a momentary button to set time, and an LED indicator. The firmware (SAVER.hex) sets on/off schedule (19:00–22:00) and can set time to 8:00 via S1; source C files can be recompiled with the PCW PIC C Compiler.

Parts used in the SAVER V3.2:

  • PIC12C508 8-pin microcontroller
  • MAC97A6 triac
  • 0.22 uF capacitor (Xc) for capacitive dropper
  • Diodes for rectification
  • 100 uF filtering capacitor
  • 5.1V zener diode
  • 32 kHz crystal (X-tal)
  • Momentary push button (S1)
  • Small dot LED
  • PCB or wiring and supporting passive components (resistors as implied)

Introduction

It's time for 8-pin microcontroller Microchip PIC12C508, the SAVER V3.2, my latest design of a device that turns a night light on and off everyday. The circuit uses only a PIC12C508 8-pin CMOS micontroller and a small triac, MAC97A6. The Saver V3.2 also demonstrates the use PCW PIC C Compiler.

Night Light Saver

Circuit Description

The schematic of the SAVER V3.2 is depicted in Figure 1.A transformerless power supply uses Xc of a 0.22uF capacitor to limit current providing about 10mA current source. The diodes rectifies ac current to dc current which in turns charged to filtering capacitor, 100uF. A 5.1V zener diode provides dc supply ~5V to the PIC12C508. The microcontroller circuit runs with low power 32kHz X-tal. GP2 connects a momentary button for setting time to 8:00. GP1 drives small dot LED that blink every 5 s for normal running. GP0 directly drives with source current to a small triac MAC97A6.

Software
Saver.hex is HEX file suitable for writing the code to the PIC12C508 chip. This file sets time to 8:00 when press S1 once. Time on and off is set to 19:00 to 22:00 everyday.

The original source program SAVER.C and SAVER.H was written in 'C' language. User may change set time when press S1 and change time on/off.

To recompile the source file you need a PCW PIC C Compiler from CCS.

 

For more detail: Night Light Saver V3.2 using PIC12C508

  • What does the SAVER V3.2 do?
    It turns a night light on and off every day according to programmed times.
  • Which microcontroller is used in the SAVER V3.2?
    The circuit uses a PIC12C508 8-pin CMOS microcontroller.
  • How is the power supply implemented?
    A transformerless capacitive dropper using a 0.22 uF capacitor limits current, followed by rectifier diodes, a 100 uF filter capacitor, and a 5.1V zener regulator.
  • What component controls the mains load?
    A small triac MAC97A6 is used to drive the load.
  • How do you set the time to 8:00?
    Press the momentary button S1 once to set the time to 8:00.
  • What are the default on and off times?
    The device is set to turn on at 19:00 and off at 22:00 every day.
  • What indicates normal operation?
    A small dot LED driven by GP1 blinks every 5 seconds in normal running.
  • Can the firmware be changed?
    Yes; the original source SAVER.C and SAVER.H can be modified and recompiled with the PCW PIC C Compiler.
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Ibrar Ayyub

Ibrar Ayyub

I am an experienced technical writer holding a Master's degree in computer science from BZU Multan, Pakistan University. With a background spanning various industries, particularly in home automation and engineering, I have honed my skills in crafting clear and concise content. Proficient in leveraging infographics and diagrams, I strive to simplify complex concepts for readers. My strength lies in thorough...