Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f






Robot Building for Beginners

A beginner’s book on how to build a robot, from the author of Robot Room. Contains tricks, tips, and advice on getting started creating your own robots from scratch. THIRD EDITION!

Intermediate Robot Building

Learn how to make a robot power supply, compare motor driver circuits, create an infrared obstacle / wall / opponent sensor, play music, and much more. SECOND EDITION!


What’s New? (Follow @RobotRoom on Twitter)
New Articles on Patreon
There are at least 30 new Robot Room articles available for patrons. Click here to check them out:



Goodbye Google Adsense!
I've removed Google Ads from Robot Room. Why?


5V Regulator Cap for 9V Battery
For quick portable projects and temporary hacks, it is often faster to reuse a simple 5V regulator circuit than to integrate a power supply into the device design. My toolbox has an LED tester and magnifier light, so why not add a convenient 5V regulator cap to the collection? There are nicer ones on the market that have surface mount components, but half the fun of an electronics hobby is creating something basic in your own style. This double-decker board with flashing LED power indicator allowed me to experiment with flush battery snaps and board interconnects.


Mercury Battery Replacement Regulator
Several decades ago, mercuric oxide button cells were common consumer power sources. Mercury was phased out due to environmental concerns, leaving behind vintage photographic equipment and watches that were incompatible with alkaline's wide voltage change or silver-oxide's slightly higher nominal voltage. Tinkerers have come up with a variety of solutions for many devices. Perhaps modern technology can address a few more with an itty-bitty 1.35V low-dropout linear regulator.
3D Printed Spool and Wire Soldering Holder
Buying new wire begs the question of what type of insulation to choose. PTFE is selected since it doesn't tend to melt back as common PVC wire insulation does. The new wire arrives without a spool, which necessitates printing a spool on a three-dimensional printer. The spool is easy enough to model but consumes the day with a six-hour print time. Soldering the newly acquired wire to another wire is frustrating with the classic misaligned 'helping' hands tool. Thus, old-fashioned wooden clothes pin attached to a base become the project being worked on rather than whatever I needed that wire for in the first place.
Generating Waveforms with Paper Discs
In a pinch, you can generate square, sawtooth, sinusoidal, triangular, and noisy/static waveforms by playing a patterned disc on a record player or spare motor using a light sensor. An LED illuminates the paper disc, which reflects varying amounts of light into the light sensor as the disc rotates on the turntable (see the video for a demonstration.) The circuitry is fairly simple and uses commonly found parts. Can you guess the waveform generated by the thumbnail image?
Resistor Forming Tool
Who hasn't looked at a classic red resistor lead forming tool and exclaimed "I could 3D print this!" I took a shot at designing and printing a few variations. The end result is a functional tool with a couple of improvements, but not as crisp, due to the limitations of home fused-filament resolutions.
Upgrading Magnifying Desk Lamp to LEDs
Circular T9 LED bulbs are available to replace fluorescent bulbs in desk lamps. LEDs provide a broader spectrum of light, which is particularly important if you are shooting macro photographs, but is also easier on your eyes if you're soldering or inspecting boards. Unfortunately, the commercial LED bulb I received was defective and had a flickering power supply. Hacking in six additional smoothing capacitors and replacing a missing LED solved the problem.

Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f - ganbaruzoi.club

Identifying Bad Capacitors
If your consumer electronic device is failing, it is often caused by old, overheated, or defective capacitors. If you open up the case and inspect the capacitors, you may find some that are bulging, crusty, or are lifting off the PCB. Here are some photographs of damaged CapXon brand aluminum-electrolytic capacitors found inside failing Samsung LCD monitors. Also included is a photo of a good capacitor that has beneficial goop surrounding it.
How *Not* to Cast and Machine Bismuth
Bismuth is a high-density non-toxic metal that forms beautiful crystals. Well, supposedly it forms beautiful crystals, just not for me. See examples of clay casting failures and chipped surfaces as I muddle my way through trying to make anything out of bismuth.

Sun Tracker Failed Project
Sometimes you gotta know when to walk away -- which was eight years ago. I dug up this robot that was supposed to emulate a sunflower tracking the sun. Due to a design flaw in an overly complicated analog sensor bus, and general ugliness, this project got literally shelved. Now it sees the light of day, if only to be a lesson to others.
Mounting an iPad for Desk-Based YouTube Videos
For many hobbies, an overhead shot of your desk or workbench is the ideal view for your videos. This is unwieldy for tripods, but suitable for a desk swing arm. Similar to a desk-mounted magnifier light, the camera can be quickly positioned at various distances, and can be swung away when not in use. The single arm does not tend to block room lighting. Take a look at my tablet-mount setup, and see how the arms were extended to fit a larger form factor.
Macro Photo vs Microscope
Fifteen years ago, I proudly photographed a PCB using an Intel QX3 toy microscope. How well does that old microscope compete against a modern 16 megapixel camera with macro lens, extension tubes, tripod, linear table, linear slide, remote shutter, 28 LED ring light, and stacked photography software? Can such a photo setup match the microscope's 200x magnification? In fact, exactly small of details can we clearly see with a modern rig? Would you believe 10 µm?
3D Printed Trimpot Thumb Dial
Create your own colorful finger-friendly dials for common trimmer potentiometers. With a little slot that press-fits into the screwdriver slot, and a dab of emblem adhesive, these home printed dials will make your projects much easier to adjust.
LED Tester with Display
Throw away your multimeter and spreadsheets, here is a self-contained current-limited LED tester that displays LED voltage drop, current, and recommended resistor. With about $10 in parts and a 9V battery, this indispensible tool is tailored for the everyday tasks of the electronics enthusiast.
Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f The TGIMBOEJ Curse
Remember that thing you were going to get to? Well, it took me seven years to ship a package. No kidding. What's inside? Are there more like that? (Yes, 144) Come closer to hear the tale of The Great Internet Migratory Box Of Electronics Junk.
Replacing Broken Tip of IC Hook Probe
Arg! The multimeter measurements are wrong because the probe detached from the circuit because the IC hook tip broke, again! I go through far too many broken IC hooks to keep throwing them away. Is it possible to 3D print a replacement tip? Is this an opportunity to improve the tip to be more robust?

Leveling A 3D Printer
How to accurately set the extruder nozzle height above the print bed when leveling a 3D printer. Use a thickness gauge, magnet, and a multimeter in continuity mode to beep when the print head makes contact. Includes a trick to clean the tip of the nozzle by scraping it with the zinc interior of a penny.

Printed Circuit Board Survey
What features do hobbyists, students, and small shops look for in a PCB manufacturer? Do people care about lead free? What about board shape and internal cutouts? Is board color important enough to offer as an option? Find out the results of the PCB survey...

PCB Motor Mount
If you don't have a home machine shop or 3D printer, you can make a motor mounting bracket from a PCB. Printed circuit boards are strong, lightweight, precise, and are easily manufactured. The PCB bracket can then be attached to your project using screws, straight solder, right-angle headers, or dual-row headers. The video in the article shows you the process step-by-step, including how to make the board non-rectangular and how to place screw holes at angles.

Better Etching of Homemade PCBs
You consistently create homemade PCBs with traces as fine as 6 mil traces, using common household objects, such as sandpaper, cleanser, aluminum foil, and a clothes iron. I test various chemicals, temperatures, and pressures to determine how to make circuits with minimal voids, distortion, and fills.
PCB Hole Sizing
How big of a hole do you need drilled in a printed circuit board to fit a part? Don't just measure the part with calipers and use that for the hole size! You must make the hole larger to account for the tolerances of the part and the circuit board manufacturer. Of course, that brings up the question of how much can you trust the size of the holes the manufacturer is drilling. Let's see what pin gages say about some of the boards laying around the robot room.
Hamming ECC
Error correcting code (ECC) is superior to ordinary checksums, in that is can both detect and correct errors in data storage and transmission. Learn how Hamming codes work. Fully working C library included.

Thermal Imaging
Infrared pictures and images can reveal energy waste, health issues, security codes, animal behavior, and circuit board flaws. It is also a great way to cheat at hide-and-go-seek. Take look at a gallery of fascinating thermal images taken with the Flir E4 infrared camera. Additionally, there is a video of a power-supply heating up, as well as desoldering wires.

Rocket Ignition System
The problem with most model rocket launch controllers is that the battery is located with the operator, far away from the launch pad. This requires thick cables and wastes significant energy. By locating the battery near the rocket engine and using a remotely-controlled relay, the improved launch system is more efficient but can still be built at home. Includes complete schematics, the pcb layout, and source/object code.
Back And Forth Mark II
The single motor drive train on the original Back And Forth robot was unique but a failure. To overcompensate, the next generation is four wheel drive and six switches just to move forward and move back, repeatedly. There are some nice mating parts that may be useful in your next project. And, you'll be surprised to see what's inside the half-height batteries.

Maximum Sampling in Software
When sampling at the maximum software rate, the signal itself may affect the software, resulting in inaccurate readings. Here is an example of how I debugged an issue and doubled the rate.
Yummy Candy Tin Robot
Yummy is a line-following robot made from an m&m's candy tin, in homage of Sweet. Yummy features a light sensor for detecting when the candy tin has been closed, to delay starting the motors as long as necessary. The rear tail lights use 10 mm red LEDs with Fresnel lenses.
Cleaning a Mouse Scroll Wheel
The scroll wheel on the Microsoft Wireless Mouse 5000 can stop working over time. As you'll see, the scroll wheel is a classic interrupter encoder wheel that can be fixed by cleaning. The difficult part was figuring out how to open this mouse, which ended up being held together with four T6 torx screws hiding underneath the glide strips.
Removing Solder from PCB Holes
Excess solder can clog circuit board holes due to overzealous soldering or when desoldering to remove a part. It can be annoying to try to get the solder out of the hole, but these methods and tools can help. Article also describes how to make your own Teflon desoldering tips.
Sturdy Attachment of a Lego Wheel to a Gearmotor
Nothing is more pathetic than a robot that has lost a wheel. Couplings based on the standard mating cross axle have a habit of sliding off. But, the peg holes present in larger wheels provide opportunities to securely attach the hub with screws. Using a lathe, milling machine, digital readout, magnets, PVC plastic, and a carefully-drafted layout can produce a rugged Lego coupler. Ah, an article on math and machining; what could be more universally appealing?
Replacement Battery Pack from AAA Cells
When a consumer device stops working because of a proprietary battery pack, you may be able to repair it by replacing the batteries with off-the-shelf rechargeables. If necessary, it is possible to solder together your own battery pack so long as you wear safety equipment, have a solder gun, and clean the terminals. Of course, this assumes you can find cells that match in size, voltage, and chemistry.
Afterthought Cake Robot
A pleasant robot that doesn’t do much consists of a collection of interesting parts assembled together because they didn’t fit any other robots. The robot is a successful experiment in making couplers shorter, employing escap rectangular motors, detecting distance moved with an interrupter infrared encoder, and a cube of multiple smaller PCBs. Powered by a single 180 mAh lithium polymer cell without a voltage regulator. Motors driven using low-voltage high-current Zetex bipolar transistors. Includes lots of big pictures and a descriptive demonstration movie.
Replacement for PNA4602M
The Panasonic PNA4602M 38-kHz infrared detector was a very popular electronic part for obstacle and wall detection. Unfortunately, the PNA4602M is discontinued and similar modules can’t handle continuous signals. Good news! The new Vishay TSOP4038 is an excellent substitute. Tests compare detection distance, false pulses, and detection time. Also included is the relevant source code to variable-frequency duty-cycle measurement.
Serial Communication
A very popular method of sending and receiving data between devices and computers is good old asynchronous serial communication. See traces of characters being transmitted. Learn how far timing can be off before introducing errors. Includes a table of popular crystal frequencies and baud rates, as well as machining information and a source code snippet for an automatic bps detection tool.
Digital Indicator
Reuse is a good thing. In this case, a unique surplus item that appears to be a digital caliper is actually a digital indicator based on the caliper body and circuitry. The data port pinouts, mounting screw sizes, and example output analysis are posted, along with a cheap way of powering the tool from a 'AA' cell.
Repairing a Model Rocket
A rocket found in a tree had loose and missing fins, a broken parachute, and a lifeless shock cord. Replacement fins can be made from balsa wood, using a pen and a hobby knife. After sanding, they can be reattached with two kinds of glue. Simple repairs and replacements make the rocket flight capable again. After all that work, an overzealous choice of a rocket motor sealed the rocket’s fate. Where do you think the rocket (and “Lego Major Tom”) ended up?
Machining Magnesium for Elemental Density Comparison
To demonstrate the massive difference in densities of naturally-occurring elemental metals, a large magnesium ingot is machined down to a precise cylinder using a hacksaw, milling machine, and lathe.
Long Exposure Photography
LEDs create beautiful and informative light trails when a robot is photographed in a dark place with the shutter open. This approach captures the exact movements and behavior in a single photo, as opposed to replaying a movie over and over. Use a tripod, remote control, and experiment with lighting conditions for best results.
Capacitor Leakage
When power is disconnected from a circuit, the capacitors on the board are discharged by the electronic components until no voltage remains. That’s fine. But, did you know that if you charge a capacitor on its own, it will slowly discharge through itself? More surprisingly, some capacitors become leakier with time, but can be healed through usage. I was shocked to discover how difficult self-discharge is to measure.
Industry-Standard LCD Modules
A blowout price on a 2x8 LCD module without specs leads to a bargain on industry-standard 14-pin alphanumeric LCDs. Demonstrates simple techniques for determining connector pins. Ultimately, the datasheet is found, and the contrast and backlighting pins are covered as well. Includes an example of writing custom bitmap characters.
Color Printed Circuit Boards
Green is so boring! Finally, your electronic devices can have beautiful red, black, and blue color circuit boards. The example shows an exposed-PCB Sandwich robot that starts with colored copper clad boards. The PCBs are etched at home with a peristaltic pump, after including an image of my dog and dealing with government-coded dots. The project is rounded out with a clear DIP socket and a shrouded battery cap.
Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f
Trimpots
A visual guide to breadboard-friendly trimpots (small variable resistors) that appear in nearly every hobbyist electronic project. The article features comparison pictures and part numbers of 3/8-inch and 1/4-inch square single-turn and multi-turn trimmers. Even more interesting is the cutaway close-up photographs of the inside gears and brushes of these tiny potentiometers.
Back-And-Forth Robot
A robot that drives forward to a wall and returns is a popular contest and student project. Surprisingly, this robot can be made with an off-the-shelf 8-pin motor chip, a couple of resistors, and a couple of chips. The article provides a complete walkthrough of the schematics, along with an animation of the changing states and a video.
Minifigure Multimeter
Have you ever had a pile of assorted resistors that you wish to quickly organize?
Pod Armour Women s Street P艡esn茅 skluzu na barv臎 zablokovan茅 艩ed媒 vlk (031) / 膷ern媒 , Adidas Originals D谩msk茅 Crazytrain Pro W Cross Tren茅r Noble Ink / Cyber 鈥嬧€婫old / Super Purple , Reebok p谩nsk茅 Crossfit Sprint TR tr茅ninkov谩 obuv 膶ern谩 / Vysok谩 Viz Zelen谩 / B铆l谩 沤ena Flextra Training Shoe zna膷ky Ryka 膶ern谩 / detoxika膷n铆 modr谩 / Athena r暖啪ov谩 / kovov谩 拧ed谩 , Reebok P谩nsk茅 crossfit Speed 鈥嬧€婽R 2.0 D Cross-Trainer boty 膶ern谩 / 膷ern谩 reflexn铆 / b铆l谩 / gumov谩 / 拧ed谩 拧ed谩 , adidas Originals p谩nsk茅 superstar p艡铆le啪itostn茅 tenisky B臎啪铆c铆 B铆l谩 Ftw / J谩dro 膶ern谩 Adidas Performance d谩msk谩 Yvori Cross-Trainer Shoe Pop Fialov谩 / Super 沤lut谩 / B铆l谩 p谩ra LALO Women s Bloodbird funk膷n铆 fitness tr茅ninkov谩 obuv Blk Ops New Balance Women Wx713gm 膶ern谩 / b臎len谩 r暖啪ov谩 , Nike P谩nsk茅 Air Zoom Pegasus 33 Tmav臎 拧ed谩 / 膷ern谩 - b铆l谩 , GUESS D谩msk媒 Gill Ballet Flat Modr媒 , NIKE P谩nsk茅 Zoom Hypercross TR2 Cross Training Shoes Wolf 拧ed谩 / kovov谩 st艡铆brn臎 b铆l谩 Volt K-SWISS 沤eny X Court Athleisure Cross-Trainer Shoe Deep Periwinkle / Grey Dawn Pod Armor Women s Threadborne Push Zata啪eno 拧ed茅 (102) / Tropick茅 r暖啪ov茅 Pod snehul铆kem C1n Tr Lux Downtown Green (300) / Nori Green , NIKE Big Kids Air Max 90 k暖啪e B臎啪eck茅 boty, Lehk谩, pohodln谩 a odoln媒 pln媒 zrn a syntetick茅 k暖啪e Cool 拧ed谩 / t臎locvi膷na 膷erven谩 / antracit NIKE P谩nsk谩 vlakov谩 rychlost 4 b臎啪eck谩 obuv 膶ern谩 / 膷ern谩 , NIKE D谩msk媒 Flex Supreme TR 4 Cross Trainer Cool Gray / Pure Platinum / White / Vol Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe 膶ern谩 / olov臎n谩 / b铆l谩 Inov-8 D谩msk谩 vlajka All Train 215 Cross-Trainer Shoe Tmav臎 拧ed谩 / r暖啪ov谩 / 膷ern谩 Reebok p谩nsk茅 Ex-o-fit Hi B铆l媒 , Superga D谩msk茅 2750 Cotu Canvas 拧kolitel茅 B铆l媒 , Skechers P谩nsk茅 Sketch Air 2.0 Rychl茅 b臎啪eck茅 boty Bkw Under Armour Men s Strive 6 Rhino 拧ed谩 / b铆l谩 / ultra modr谩 Reebok p谩nsk茅 kloktadlo HC Leather Sneaker Kachn铆 k谩men / K艡铆da Converse Chuck Taylor V拧echny hv臎zdn茅 sez贸nn铆 barvy Ahoj 膶ern谩 膷ernob铆l谩 , Tr茅ninkov谩 obuv New Balance MX517v1 pro mu啪e 艩ed谩 / n谩mo艡n铆 RYKA Dynamic 2 Women Cross-Training Shoe Cool Mist Grey / Detox Blue / Athena Pink / Chrome St艡铆brn谩 , Tr茅ninkov谩 obuv NIKE Women s Metcon 2 Modr谩 odst铆n / Squadron Blue / Blue Glow
Place each resistor in the hands of the electrified Lego minifigure to see and hear the nearest standard resistance. This practical meter includes both an ohmmeter for resistance measurement as well as a voltmeter for battery measurement.
BEARPAW Abby 啪en B铆l媒 o艡ech AllhqFashion D谩msk茅 PU N铆zkoprofilov茅 boty s n铆zkou podpate膷nost铆 R暖啪ov媒 , Dev臎t Z谩padn铆 啪eny Fran9x Suede Mid Calf Boot V铆no / 膶ern媒 semi拧 , FRYE D谩msk谩 Natalie Short Boot Engineer P铆sek Stetson 啪ensk茅 Cowgirl Tulip z谩padn铆 boty Vintage Brown G4U d茅拧钮 啪en V铆ce boot暖 Styly Barva St艡edn铆 Calf Wellies Buckle M贸dn铆 pry啪 Knee High Snow Obuv 膶erven谩 / 膷ern谩 kostka , 膶tvrtek Boot Company Prezident Men & 6s Lace-up Boot Grizzly Wheat Timberland d谩msk茅 teddy fleece sklopn茅-dolu vodot臎sn茅 boty 膶ern媒 nubuk Ukris p谩nsk茅 m贸dn铆 oka na knofl铆ky rychl茅 su拧en铆 vody F-modr谩 , Reebok p谩nsk茅 膷ern茅 ko啪en茅 boty na Metguardu SR 膶ern谩 FRYE D谩msk谩 Abigail Jezdeck谩 le拧t臎n谩 botka Black-76172 LifeStride 沤eny Xripley-Wc jezdeck茅 boty Tmav臎 hn臎d谩 , Klogs USA D谩msk茅 DUSTY Clog Leskl媒 膷ern媒 , adidas Originals d谩msk茅 Adizero Ubersonic 3 w tenisov谩 obuv B铆l谩 / j谩dra 膷ern谩 / b铆l谩 , Diadora X-Phantom Jr - p谩nsk茅 膶ern谩 / 膶erven谩 Fluo Fizik M3B Uomo BOA obuv 膶ern谩 Alegria d谩msk谩 paloma flat Hippie Chic Dottie , IDIFU D谩msk茅 vintage platformy vysok茅 podpatky Chunky Lace Up Oxfords N铆zk茅 Top boty B茅啪ov媒 , Qupid Paz 01 D谩msk茅 kovov茅 perforovan茅 krajky s tenisky Rose Gold , NIKE P谩nsk谩 SB Check Solar Skate Shoe 膶ern谩 b铆l谩 Miyoopark KL194 D谩msk媒 k艡铆啪ov媒 艡em铆nek p艡ezka Suede k暖啪e Latinsk谩 Salsa Tango svatebn铆 sand谩ly 閲囬泦 瀹屾垚 , Mona Flying Women s K暖啪e perforovan谩 Knofl铆ky Oxfords Obuv pro 啪eny Wingtip Multicolor Broukov茅 boty 艩ed谩 , Poh谩dkov茅 pl谩t臎n茅 pl谩tno boty Cosplay boty tenisky b铆l茅 B铆l谩 4 Vans Women s Sk8-Hi (Core) Core Classics R暖啪ov媒 DC p谩nsk谩 trasa TX Unisex Skate Shoe V谩penec , Camel Mens P谩nsk媒 ko啪en媒 sportovn铆 p谩sek Sportovn铆 p谩s P谩nsk茅 sand谩le a tlum铆c铆 n谩razy Camel / Brown Z谩padn铆 拧茅f p谩nsk茅 boty Work Shoe Triumph Romeo Adidas D谩msk茅 Adilette CF + Mono W Slide Sandal, 拧ed茅 t艡i / 拧ed茅 t艡i / 拧ed茅 t艡i, 7 M US 艩ed茅 t艡i / 拧ed茅 t艡i / 拧ed茅 t艡i IVAO Women Men Aqua pono啪ky Rychl茅 su拧en铆 Unisex Barefoot vodn铆 boty pro pl谩啪ov茅 plav谩n铆 Surfov谩n铆 j贸ga Graffiti Pono啪kov茅 vodn铆 pono啪ky, Unisex Water Skin Boty s n铆zk媒m horn铆m pot谩p臎n铆m 艩norchlov谩n铆 neoprenu Pl谩啪ov茅 pono啪ky pot谩p臎n铆 Pono艡te pono啪ky 拧norchl Volejbalov媒 fotbal Boty pro vodu Sportovn铆 j贸ga 膷ern媒 jelen
Weatherproof Project Box
Modifying a Pelican micro-case for a dustproof, waterproof, and bugproof outdoor electronics container. Tips on punching a rubber liner and connecting external wires through a PVC pipe, or hacking a seal with poster tack.
Safe Sync for External Flash
Digital cameras have a relatively low voltage limit on their sync hot shoe, compared to mechanical cameras. This makes modern cameras susceptible to damage from higher-voltage external flash units, which consumers and hobbyists may attempt to reuse from previous generations. The circuit described in this article is a classic solid-state level-shifter often used to interface DC circuits to AC appliances.
Electrolysis Rust Removal
There’s nothing more depressing than to see corrosion on your precision tools or antique hardware, particularly if the rust is in a hard to reach area. Fortunately, there’s an electrical technique to reverse oxidation without harming steel or iron the way abrasives or harsh chemicals can.

Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f - ganbaruzoi.club

Includes results of testing a graphite electrode for the anode.
How to Measure Low Resistances
Occasionally you'll run across electronics such as relays, cables, igniters, switches, or current-sense resistors that have resistances less than one ohm. Few multimeters accurately measure less than 1 Ω, but most have a millivolt mode that can be combined with a 5 V source, a fixed resistor, and some simple math to determine milliohm resistances.
PCB Layout Tricks and Tips
A few extra holes, wider pads, and copper fills can greatly increase the versatility, solderability, and ease of testing of the printed circuit boards you design.
Solar Recharging
A small solar panel or series of solar cells can power an electronic device during the day, as well as recharge NiMH batteries to power the device at night. This simple recharger uses diodes for reverse-power protection and so that the project can measure the power source voltages. Includes schematics and graphs. Reebok d谩msk谩 Crossfit Nano 7,0 Track Shoe Shoe Hunter Nano 沤ensk谩 k艡铆da/ Hunter Green aaed88f
Multimeter Reviews
A digital meter is an essential tool for all robot builders and electronic hobbyists. If you’re just starting out, can you buy the least expensive model and still get accurate results? How much do you need to spend to get a decent mid-range model? A dozen multimeters are tested and compared.

Previous articles are moved into the categories below. To be automatically alerted to new articles when they are posted, subscribe to the Robot Room RSS feed.

All Articles
Robots
All robots
Line-Following Robots
Including maze solving
Mini-Sumo Robots
Plus ring making and rules
Solar Robots
Fitness & Cross-Training BEAM and microcontroller
Motors
Mounts, couplers, H-bridge, PWM
Machining
Milling, drilling, and lathe
PCBs and Breadboards
Solderless and printed circuits
Tachometers
Also counters and encoders
Electronic Projects
And various electronic parts
0
1
2
3
4
5
6
7
8
Sensors
Infrared, photo, and distance
Inside Toys
Reverse-engineering
Calculators
Ohm’s law and resistor bands
Miscellaneous
Multimeters and more
Obsolete
Scrapyard of old articles