With Instructables you can share what you make with the world, and tap into an ever-growing community of creative experts.
Imagine a paperweight that not only holds piles of paper in place, but perpetually blinks !
A solar cell, supercapacitor, and a new ultra low power 555 chip make it possible !
The heart of this novelty is the CSS555 timer integrated circuit. It is a micropower version of the venerable 555 and 7555 chips that the electronics ...
The basic circuit used here is the standard 555 astable setup. At the start of an ongoing cycle, the timing capacitor CT starts charging up through r...
The diagram shows how the voltage cycles at the output pin and the timing capacitor. After the initial energizing of the circuit, steady state operat...
The values of the components used in the original paperweight circuit are: RA = 10M RB = 47K CT = 0.22uF RL = 47 CS = 1.0F These values give a perio...
A Google search will reveal a host of suppliers of phenolic stripboard. The CSS555 Timer IC is available from Jameco . Be sure to find a superc...
Once the electronic components have been gathered, breadboard them together to make sure everything will work to your satisfaction. It is not a pleas...
The solar cell to use should be the thin film on glass type because these have good voltage under indirect or ordinary room lighting - even fluorescen...
We have a be nice comment policy. Please be positive and constructive.
We noticed you attached photosto your comment.
I made one cast in epoxy resin. It's been working for a month now. (yes, that's a big bubble on the solar cell.) I think I'll cast one in layers to eliminate bubbling.
Finished. I'm letting it cycle thru a couple of days of charging and discharging to see how it holds up. My paperweight is the 'deep' model (a bit over 1/2" of space). I also had to upsize the solar cell just a bit because the smaller one was backordered.
Thanks for the plans !!!!
Any idea how to prevent those tiny solar panel pads from popping off. They are quite easily pulled loose. I was thinking of adding a large blob of E6000 glue over my wiring connection to add some physical strength.
Are you referring to the "pads" on which the wire leads are soldered? If so, then glue on the wires is a prudent idea. I usually place a dollop of glue (epoxy or sometimes even Tacky Glue) on each wire coming off the cell as a "strain relief" so the pads themselves do not experience stress. And when a pad does come loose before being treated as above, I have found that a product called "Wire Glue" can be used to attach wire to the cell and restore the electrical connection, and when dry (and checked), then the strain relief glue can be added.
Fixed it. My breadboard wiring was messed up. With just a quick charge from a couple AA batteries, it is now blinking all night long.
I'm waiting on a small solar panel for my project. However, I have a battery charging the circuit, and the led is blinking ok. The capacitor I have is 1.5f at 5v. When I disconnect the battery, I don't get any further blinking of the led. I must have missed something.
I like this project !
It is good to have the blinking part of the circuit working! Check that the capacitor is taking and holding a charge from the battery with your voltmeter. If it takes and holds the battery voltage, and is connected OK, and doesn’t have excessive internal resistance, it should blink the circuit just as the battery does, right?
555 Timer In ASTABLE Mode - A Tutorial With Theory, Schematic, & Lab Sectionsby EngineeringShock
The Versatile 555 Timerby blinkyblinky
Blinking an LED with a 555 Timer Circuitby andrespineda
555 Timer In Monostable Mode - A Tutorial With Theory, Schematic, & Lab Sectionsby EngineeringShock
555 Timerby alilovic007
Know Your IC: 555 Timersby frenzy
Build a Tone Generator--Improve Your Snap Circuits by Adding a 555 Timer ICby KRA5H
learn about the 555by Jimmy Proton
Led 555 Timerby alilovic007
PWM Lamp Dimmer using NE555 Timerby Electronics Hub
Join 2 million + to receive instant inspiration in your inbox.
Download our apps!
© 2015 Autodesk, Inc.
By clicking "Create Account" you are indicating that you have read and agree to the Terms of service.
Already a member? Login »
Enter the email associated with your account and we will send you your username and a temporary password.
Not a member? Sign Up »
Want to go pro?
First step is to sign up.
By clicking "Sign me up!" you are indicating that you have read and agree to the Terms of service.