Instructables

Pocket-Sized Nightlight, Low Voltage with Timer

Picture of Pocket-Sized Nightlight, Low Voltage with Timer
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This little gadget is for the the little kids.
It creates an ever changing palet of colorful lights on the wall and ceiling.
It uses the ever popular 555 timer (gateway drug equivalent in electronics) to turn itself off in 15 (+ or - 3) minutes.
The voltage in low enough to be battery operated but works best with a wall AC to DC transformer. 9 volts is best, plus safe for the kids.

And now for a video:

I've been super busy taking part in Dallas Red Bull Flugtag. I am part of Team Dworks.
https://www.facebook.com/pages/The-Down-to-Earth-Dworks/454064038017699#!/pages/The-Down-to-Earth-Dworks/454064038017699
 
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Step 2: Parts and Tools

Here is the parts list:
  • 10 color changing LEDs. RGB Slow change or Slow fade. Avoid "Fast Blink" RGB LEDS - this is a sleeptime nightlight for the kids, not a disco light system.
  • 1 555 IC
  • 1 power transistor or MOSFET
  • 2 10 KOhm resistors
  • 1 0.01 uF capacitor
  • 1 36 Ohm resistor
  • 1 1.8 M Ohm resistor
  • 1 1 M Ohm resistor
  • 1 470 uF electrolitic capacitor
  • 1 NO momentary push button switch
  • 1 power jack
  • 1 small tin container with a clear lid
  • Some wires
  • Solder
  • Glue
  • a scrap piece of wood

Tools:
  • Soldering iron
  • wire cutters
  • wire strippers
  • dremel
  • drill press or hand drill
  • drill bits
ritzanab11 months ago
Sorry also, is the white on black schematic the same thing as the black on white schematic...
I am having great difficulty reading what the white on black one says.
MrTinkerer (author)  ritzanab10 months ago
I'm sorry. I thought both schematics where black on white background. In any case, the two schematics I have explain two different things, the first one explains how to wire up the 555 timer chip. the second schematic explains how to wire a MOSFET to the output (pin 3) of the 555 timer.
It's ok thanks for your help!
Do 4 pin LED rgb lights work for thi?
MrTinkerer (author)  aanderson-rolfes10 months ago
sorry, no. The circuit does not have controls for each individual color of an RGB LED. the circuit is there just to turn the night light off automatically after a set amount of time based on the RC Constant. I used LEDS that are RGB but change color on their own.
I'm very new to this stuff, but what does bridging the pins 6 and 7 mean?
MrTinkerer (author)  aanderson-rolfes10 months ago
solder the legs of pin 6 and 7 together. :)
ritzanab11 months ago
Thank you for ur help!!
ritzanab11 months ago
Also what is the casing?
MrTinkerer (author)  ritzanab11 months ago
a circular tin with a clear top.
MrTinkerer (author)  MrTinkerer11 months ago
i did an ebay search for "round tin clear top"
ritzanab11 months ago
Thanks!! Can you possibly send me a link to the resistors?
MrTinkerer (author)  ritzanab11 months ago
Here is the link when i did a search for "Resistor Assortment"
http://www.ebay.com/itm/77Values-metal-film-resistor-assortment-kit-1W-1-3850pcs-/390598832628?pt=LH_DefaultDomain_0&hash=item5af18131f4
Adarsh_tronix11 months ago
Why have you given separate bullets for 555 IC and 555 timer?I thought they were the same,or aren't they?
MrTinkerer (author)  Adarsh_tronix11 months ago
You are right. That was a typo. I have corrected it.
ritzanab11 months ago
Sorry, if possible a link for all resistors...THANKS!!!
MrTinkerer (author)  ritzanab11 months ago
Cost for the project is perhaps $10-$15. Less if your are really good at shopping. I purchased an assortment pack of resistors at ebay. I made sure the assortment contained the values I needed. you can always chain a series of resistors together to get the value your want too.
ritzanab11 months ago
Also, if possible can you send me a link on ebay for the 36 Ohm resistor? Thanks.
ritzanab11 months ago
How much is this project?
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