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Parts: 1.Arduino Nano (Amazon / eBay) 2.P-MOSFET ( Amazon / IRF 9540 x2 ) 3.Power diode ( Amazon / MBR 2045 for 10A and IN5402 for 2A) 4.Buck Converter ( Amazon / eBay) or Voltage Regulator (LM7805) 5.Temperature Sensor( Amazon / LM35) 6.Current Sensor ( Amazon / ACS712) 7.TVS diode ( Amazon / P6KE36CA) 8.Transistors ( 2N3904 or 2N2222) 9.Resistors( 100k x 2, 20k x 2,10k x 2,1k x 2, 330ohm x 5) 10.Ceramic Capacitors (0.1uF x 2) 11.Electrolytic Capacitors ( 100uF and 10uF) 12. 20x4 I2C LCD ( Amazon / eBay) 13.RGB LED ( Amazon / ebay) 14.Bi Color LED ( Amazon ) 15.Jumper Wires/Wires(eBay) 16.Header Pins (Male,Female and right angle) 17.Heat Sink ( Amazon / eBay) 18.Fuse Holder and fuses ( Amazon / eBay) 19.Push Button ( Amazon ) 20.Perforated Board (Amazon / eBay) 21.Project Enclosure 22.Screw terminals ( 3x 2pin and 1x6 pin) 23.Nuts/Screws/Bolts 24.Plastic Base Tools : 1.Soldering Iron ( Amazon ) 2.Wire Cutter and Stripper ( Amazon ) 3.Screw Driver ( Amazon ) 4.Cordless Drill ( Amazon ) 5.Dremel ( Amazon )

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RS-232 Laser Transceiver Published in Electronics Australia Oct. 1997 pp.56-61 Laser based projects used to be expensive, until the development of solid state lasers. This project is designed for the entry level laser experimenter. The circuit allows any two computers with serial (RS-232) communication capability to communicate over 200 meters using a laser beam. A low cost transmitter only circuit is also presented here for use in one way communication and other laser based projects. Introduction DIY thermoelectric device charges hiker's smartphone ( —Whether you're in a city café hunting down a spare outlet or camping and worrying about losing outside contact, the problem is the same, a smartphone about to lose power just when you need it the most. What to do? A problem-solver who is into hiking and backpacking has an answer. He shows, step to step, how to construct a portable thermoelectric emergency generator. David Johansson, who used the project-sharing site Instructables for his step by step instructions, explained how he arrived at the idea, construction, and results. Spending several days hiking in the wild at times, he would rely on his smartphone with GPS, along with spare batteries and solar chargers.

EcoRenovator - View Single Post - DIY ventilation heat exchanger Thanks Ryland A small air-air heat pump (like an old A/C unit) could be hooked up after the heat exchanger, increasing the amount of heat transfered, or reducing the temp difference on both sides of the AC, depending on how you look at it. In fact, there will already be a heat pump in the system we are planning, it will transfer heat from waste air to the hot water tank.

6V Solar Battery Charger Circuit - Electronic Circuit Projects In this post we discuss a simple 6V solar battery charger circuit with an automatic cut-off feature using 4 way LED indication, and an overcurrent protection. The system can be operated through a solar panel or via an AC/DC mans adapter unit. The idea was requested by Mr. Bhushan Trivedi.The RequestDear Swagatam, Greetings, I trust you are well. I am Bhushan, and I am working on a hobby project currently. Rusk County Amateur Radio Club: Op Tools This page contains information from a variety of sites including DX operation, propagation and more. If you have any suggestions for information to be listed here please contact us! QSL Bureau Search Check the 5-Area Incoming QSL Bureau - See what your sorter has on file for you. Line-of-sight ProfilerFollow this link below (or click on the image), then click on the map for your first location followed by a click on your second location. The site will then display a projected line-of-sight profile between the two points.

Hacked Gadgets – DIY Tech Blog deba168 from India designed and built this Arduino Solar Charge Controller to provide electrical power in areas where the grid can’t always provide power when needed. Code and schematics are provided so you can get some inspiration from the design. ”At first the charge controller will check the solar panel voltage and compare it with battery voltage ,If it is greater then the Arduino will starts sending pulse width modulation(PWM) signals to the mosfet(Q1) in order to charge the battery .When the solar panel voltage was below the battery voltage ,this pwm signals will not send by Arduino . Then next the micro controller will check the battery voltage ,if the battery voltage was below 6.96 v volts then the battery will be charged in boost mode ,that mean the battery will be charged with maximum amperage ,this boost mode of charging will be done by sending pulse width modulation signals with 95% duty cycle .

These Satellite Images of Earth "Breathing" Are Freaking Me Out It freaks me out that tiny atoms and huge solar systems consist of things rotating around each other in a similar way. It's also weird to see time-lapse footage of human beings building things (like that super-fast hotel build in China) and realize how insectoid our activities look when sped up. And above you see the latest strange big/small connection: The planet Earth resembling a beating heart or a breathing being. A guy named John Nelson runs the UX Blog, which covers user experience, mapping and data visualization for parent software company IDV Solutions. Nelson pulled twelve rare, unobscured-by-clouds images of our planet off of NASA's Visible Earth catalog taken at different times of the year. Stitching them together into an animation, he made the visually stunning discovery you see here: As the seasons change, the ebb and flow of snow and greenery makes our little rock look like it's breathing.

C2000 Solar MPPT tutorial covering the electronics & C code In this second part of the C2000 Solar MPPT Tutorial, the hardware and circuit design will be looked at in greater depth. The schematic for the system is posted again below for reference, which can be enlarged by simply clicking on it. Buck Converter Design REUSE YOUR OLD LAPTOP BATTERY TO MAKE A POWER BANK Few months ago my Dell laptop battery did not work.Whenever I unplug it from main AC supply,the laptop switched off immediately.After few days of frustration, I replaced the battery and kept the dead one (as per my laptop message) for tinkering.I was curious what I would find inside it.Then I go through several blogs and forum to get some ideas.I got lot of things from Then I took apart the battery and charged them by using a good charger.By luck I found 4 batteries are in good condition. I used this battery to make a descent power bank.It really works fine for me.I thought I'd share the info to all.So that any one reuse it without throwing it in to the dust bin. In this tutorial I will show you, how to harvest the 18650 battery from any of the old laptop battery pack you might have. Most of the time, laptop battery packs go bad when just one or few cells in the pack are dead.

Float charging lithium ion cells Apart from making better door stops, what advantage do lead-acid batteries have over lithium ion (Li-ion) batteries? The answer is that they are easier to charge. Apply 13.8V to any nominally 12V lead-acid battery and it will take just the current needed to keep itself in tip top condition, and it will be ready to deliver its full capacity instantly. Applying a constant potential is called ‘float charging’ and lead-acid batteries are almost perfectly suited to it. While more expensive per Watt-hour, lithium-ion cells are far lighter, smaller and contain fewer toxic chemicals than most other commonly available battery types.

untitled The Compact Door has been designed to incorporate the advantages of both Roller Shutter and Overhead Sectional Doors and to overcome their inherent disadvantages. What makes the Compact door different from all other Industrial doors is its unique patented rail system. On opening the door panels fold upwards into a compact space above the door similar to a roller shutter. However, unlike a roller shutter the Compact Door panels are insulated and can also be fully glazed. A wicket door can be built into the door panels if required. The smooth and quiet movement of the panels uses little energy this guarantees a longer life cycle and lower maintenance costs.