PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75






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.

PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75 - 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.
PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75 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.
PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75
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?
Reebok D谩msk谩 obuv Esoterra DMX Lite Track Uhl铆 / 膶ern谩 / Guava Punch / B铆l谩 , D谩msk茅 boty NIKE Metcon 4 B铆l谩 / st艡铆brn谩 metal铆za NIKE Roshe Ld-1000 p谩nsk茅 b臎啪eck茅 tren茅ry 844266 boty na tenisky 膶ern媒 t媒m Orange Sail Black 008 adidas P谩nsk谩 Crazy Power Rk Cross Tren茅r Hi-res Modr谩 / Hi-res Orange / Collegiate Royal Puma Women s Tazon 6 WN s Cross-Trainer Shoe Puma White / Fuchsia Purple / Puma st艡铆brn谩 K-拧v媒carsk茅 d谩msk茅 trubky Infinity CMF Fashion-Sneakers Skryt谩 zelen谩 / b铆l谩 , Converse Chuck Taylor V拧echny hv臎zdn茅 sez贸nn铆 barvy Ahoj burgundsk茅 Reebok Work Men s Zprint Work Athletic Oxford Tmav臎 拧ed谩 / 膷ern谩 , NIKE Romaleos 3 p谩nsk茅 852933-101 B铆l媒 膷ern媒 , Nov茅 balancovan茅 d谩msk茅 kalhoty FuelCore Nergize V1 Fuel Core Cross Tren茅r 艩ed谩 , Inov-8 D谩msk谩 vlajka All Train 215 Cross-Trainer Shoe 膶ern谩 / Navy / Neon 沤lut谩 , Nov媒 balan膷n铆 d谩msk媒 77V2 s铆钮ov媒 trena啪茅r 膶ern谩 / st艡铆brn谩 , New Balance mu啪暖 627v2 pracovn铆 v媒cvikov茅 boty Hn臎d媒 , Diesel P谩nsk茅 Riotness White tenisky B铆l媒 , PUMA p谩nsk茅 Tazon 6 Fracture FM Cross-Trainer Shoe Puma Black Pod Armor Women s Charged Push Chicago Blue / Blue Drift / Metalick茅 st艡铆bro LALO P谩nsk谩 Bloodbird Athletic Training Shoe Blk Ops , PUMA p谩nsk茅 Tazon 6 Fracture FM Cross-Trainer Shoe Puma Black-puma 膶ern谩 ASICS D谩msk谩 Gel-Craze TR 4 Cross-Trainer Shoe 膶ern谩 / matn谩 r暖啪e , MT-onemix D谩msk茅 mu啪i Awesome 3-v-1 lehk茅 atletick茅 boty Rome Sneaker Burgundsko / B铆l媒 I. , Adidas p谩nsk茅 Freak X Carbon Mid Cross tren茅r Modr谩 / kovov谩 zlat谩 / b铆l谩 , adidas Originals p谩nsk茅 superstar p艡铆le啪itostn茅 tenisky Kr茅m / b铆l谩 , P谩nsk媒 ekvaliz茅r 2.0 Skechers je na cest臎 Navy / Gray / Silver , Nike P谩nsk茅 Air Zoom Pegasus 33 Modr媒 , Adidas Originals D谩msk谩 atletika B W Cross Tren茅r Mystery Ruby / no膷n铆 metalick谩 / 膷erven谩 noc ASICS d谩msk谩 ko啪en谩 trena啪茅ra FuzeX TR B铆l谩 / Diva r暖啪ov谩 / st艡edn铆 拧ed谩 NIKE P谩nsk谩 vlakov谩 rychlost 4 b臎啪eck谩 obuv 膶ist谩 platina / 膷ern谩 / chladn谩 拧ed谩 Reebok P谩nsk谩 tenisov谩 obuv se sourozenci Black / White_bla , P谩nsk茅 tren茅rky Nike Reax 9 TR 膶ern谩 / b铆l谩 / tmav臎 拧ed谩
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.
Hledan茅 boty D谩msk茅 Forge Bootie Op谩len铆 Ivanka Trump D谩msk谩 l谩herov谩 jezdeck谩 obuv 膶ern谩 Carolbar d谩msk谩 spona 拧pi膷at谩 拧pi膷ka sexy no膷n铆 klub vysok谩 patka p艡es kolena 膶ern谩 , adidas Originals p谩nsk茅 superstar p艡铆le啪itostn茅 tenisky 膶ern谩 / 膷ern谩 / b铆l谩 Converse Chuck Taylor V拧echny Star Core Hi 膶erven茅 Nine West Women s Wiseplay syntetick茅 koleno vysok茅 boty 膶ern谩 syntetick谩 Polo Ralph Lauren P谩nsk谩 ko拧ile zna膷ky Radbourne Tmav臎 hn臎d谩 Rieker Womens Z9580 Liz bo膷n铆 zip Jezero Cristallino / Pazifik Samtcalf / Marine Virage Sexy2 p艡es koleno 拧umiv茅 drahokam Stud Stiletto heel skryt茅 plo拧inov茅 boty Slvglt_immerse , Easy Street Women Kila Byt Brown Shimmer , Skechers Sport D谩msk谩 EZ Flex Flighty Majesty Slip-on Flat B铆l媒 D谩msk媒 sand谩l zna膷ky Crocs Swiftwater Wave Elektrick谩 modr谩 Gold toe Women s Lois 拧aty kv臎tinov茅 Vy拧铆van媒 balet Ploch茅 膷erpadlo bez paty 艩pi膷at谩 拧pi膷ka Na obuvi Comfort Kv臎tinov谩 1 Liz Loafer 啪en谩m Tyrkysov媒 , Brinley Co Womens Thirza Blok Pata Ztr谩ta Loafer Mules Hn臎d媒 , El Naturalista 啪ensk谩 N096 Clog Hn臎d媒 , Steve Madden D谩msk茅 sand谩le Carnabi 艩ed谩 nubuk 50 odst铆n暖 Tan Danceov谩 obuv: Komfort Ve膷ern铆 拧aty svatebn铆 膶erpadla, Tane膷n铆 s谩l Obuv pro latinu, Tango, Salsa, Swing, Theather Um臎n铆 od 50 odst铆n暖 (2,5 \ & 3 \ Rocket Dog d谩msk茅 Jumpin Orchard bavln臎n媒 m贸dn铆 tenisky Modr谩 Stella Adidas Originals p谩nsk茅 boty Seeley Trace Khaki / 膷ern谩 / b铆l谩 , Show Shine D谩msk谩 m贸da Chunky Heel n谩m臎st铆 Toe Oxfords boty 膶ern谩 Ozna膷it Nason Angeles Women s Buckner M贸dn铆 tenisky burgundsk茅 , Abby A29 Womens Sexy ve膷e艡e vysok谩 Kruhov媒 no膷n铆 klub Party Cross obl茅k谩n铆 P艡edn铆 strana US9-18 Otev艡en媒 k艡铆啪 Poutko na kotn铆k PU Sand谩ly US Polo Assn. Blush / B铆l谩 ZYZF d谩msk茅 膷铆nsk茅 vy拧铆v谩n铆 kv臎tinov茅 cestov谩n铆 sportovn铆 ch暖ze boty byty Oxford boty B茅啪ov媒 Merrell d谩msk媒 Terran Strap II Sandal 膶ern谩 Dolce Vita D谩msk茅 sand谩le Celaya Slide Jade Fringe , McRae p谩nsk谩 Coyote suede / nylon Terassault svobodn茅 vojensk茅 boty Kojot , Wave - Mens Aqua Shoe 膶ern谩 b铆l谩 , Dal拧铆 letn铆 p谩nsk茅 vodn铆 s铆钮ky letn铆 boty Sport b臎啪eck茅 boty Modr媒 ,
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.

PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75 - 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. PUMA P谩nsk茅 zapalova膷e P谩nsk茅 Evoknit Lo Pavement Cross-Trainer Peacoat Shoe Shoe Ovesn谩 ka拧e/ Vintage Khaki/ Peacoat 9554a75
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