The Adafruit Eagle Library What be in the Adafruit Eagle library hells yes its my very own mixtape of package footprints. Dont forget you can also grab parts out of any adafruit project's .brd file by running exp-project-lbr.ulp . However, since its nice to be tidy, I'll be merging everything into ONE FILE called the Ye Olde Adafruit Eagle Librarie, available at github How to repair IBM thinkpad 240 batteries (02K6608,02K6606) Back to resources How to repair IBM thinkpad 240 batteries (02K6608,02K6606) Caution Li-ion cells are dangerous be very careful when disassembling your battery pack - only do this if you know what you're doing this page is meant as an educational guide not a how to. Direct Power! Why not just connect your battery straight to the LED? It seems so simple! What's the problem? Can I ever do it? The problem is reliability, consistency & robustness.
Light Emitting Diodes (LEDs) Colour | Sizes and shapes | Resistor value | LEDs in series | LED data | Flashing | Displays Also see: Lamps Example LED: Circuit symbol: Function LEDs emit light when an electric current passes through them. Electronics and Electrical Engineering Tools Calculate the required trace width for a specified current Inputs Trace Width Unit Trace Thickness Charging Lithium-Ion Batteries – Battery University Find out how to prolong battery life by using correct charge methods. Charging and discharging batteries is a chemical reaction, but Li-ion is claimed to be the exception. Battery scientists talk about energies flowing in and out of the battery as part of ion movement between anode and cathode. This claim carries merits but if the scientists were totally right, the battery would live forever. Scientists blame capacity fade on ions getting trapped, but as with all battery systems, internal corrosion still plays a role. The Li ion charger is a voltage-limiting device that is similar to the lead acid system.
Arduino mood light I recently saw the cool mood lamp by Philips and I liked it. What I did not like was the price. I set myself to discover what the industry has to offer in terms of high-power LEDs. It turns out that since the old 20mA red LEDs the market has evolved in such a way that it seems the light appliances of the future might be completely LED-powered. Now there are 3W and 10W LEDs available. ANSI PCB Track Width Calculator This is the NEW version of my calculator. The original version is HERE. New features in this version include: use of metric or imperial units for all major fields the ability to change units for any applicable field on the fly minor enhancements to some of the calculations - IPC-2221(A) changes the curve fit saving of all parameters in a cookie to keep your preferences between visits This page calculates approximations to the ANSI / IPC-2221/IPC-2221A design standards for PCB trace width - this is the replacement for IPC-D-275.
18650 battery test 2011 18650 battery test 2011 A 2012 test can be found here In this test I have measured many different 18650 batteries and collected the data in bar graphs and curves. The above picture shows most of the cells I have tested. Capacity: Measured capacity at 0.2 ampere discharge rate (This is the average from the two tested cells). Blog Archive » Arduino-controlled IKEA Lamp Posted by adminon September 07, 2009Arduino, Projects This is a project I have been working on for the past 2-3 weeks. I wanted to create a night light which had to be very simple to use and with no parts that can be consumed by babies! I used 20 RGB LEDs (which I got from www.oomlout.co.uk), an old Eriksson phone charger and, of course an arduino board (actually I used an old SparkFun clone). And a push button… And an Ikea lamp (”Lampan”, currently priced at £2.59 in the UK, around $5 in the States, This is a very cheap lamp, very hackable and safe for kids too (as all the components are safely hidden away).
Measuring State-of-charge - Battery University Comments On September 21, 2011 at 12:51pm Joe Accetta wrote: Schematic of 8x8 Led Dot Matrix Clock using PIC16F627A The above schematic is 8x8 Led Dot Matrix clock using PIC16F627A (or PIC16F628 which is more expensive but larger memory) and a shift register 74HC595. The PIC is running with 4MHz internal oscillator so pin 15 (RA6) and 16 (RA7) are free. Therefore, the PIC16F627a can drive the 8x8 Led Drive matrix with these 2 free pins (RA6, RA7) and RB0-5, .
LEDs, 555s, PWM, Flashers, and Light Chasers Index LEDs, 555s, PWM, Flashers, and Light Chasers by Bill Marsden, courtesy of I'm moving this article to blog format to allow me greater flexability in editing. Please, do not comment in the blog, if you do I will delete it. If you want to leave a comment do it here. If you want to copy this for any use feel free, but please leave my name and the forum attached.
LittleBits Hue Lighting Controller Animated GIF showing me using the LittleBits Hue Controller to cycle the brightness and color of my lights In case it wasn’t clear from my recent cameo on some RadioShack fliers, I’ve been having a bunch of fun with LittleBits‘, more sophisticated modules recently. A few months ago, I posted a project showing how to use the CloudBit to connect your umbrella stand to the internet.