Posts with «arduino» label

Debunking Moon Landing Denial with an Arduino and Science

It’s sad that nearly half a century after the achievements of the Apollo program we’re still arguing with a certain subset of people who insist it never happened. Poring through the historical record looking for evidence that proves the missions couldn’t possibly have occurred has become a sad little cottage industry, and debunking the deniers is a distasteful but necessary ongoing effort.

One particularly desperate denier theory holds that fully spacesuited astronauts could never have exited the tiny hatch of the Lunar Excursion Module (LEM). [AstronomyLive] fought back at this tendentious claim in a clever way — with a DIY LIDAR scanner to measure Apollo artifacts in museums. The hardware is straightforward, with a Garmin LIDAR-Lite V3 scanner mounted on a couple of servos to make a quick pan-tilt head. The rig has a decidedly compliant look to it, with the sensor flopping around a bit as the servos move. But for the purpose, it seems perfectly fine.

[AstronomyLive] took the scanner to two separate museum exhibits, one to scan a LEM hatch and one to scan the suit Gene Cernan, the last man to stand on the Moon so far, wore while training for Apollo 17. With the LEM flying from the rafters, the scanner was somewhat stretching its abilities, so the point clouds he captured were a little on the low-res side. But in the end, a virtual Cernan was able to transition through the virtual LEM hatch, as expected.

Sadly, such evidence will only ever be convincing to those who need no convincing; the willfully ignorant will always find ways to justify their position. So let’s just celebrate the achievements of Apollo.

An Affordable Phone Controlled Rover

A while back Jason made a phone controlled rover using the MotorAir. He wanted to revisit the basic idea but using cheaper, more widely available parts. Also since this is Arduino based, it is a great springboard for more than just a rover that drives around. You could add sensors, servos, etc. to really drive this project in any direction you want.

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Let's Make Robots 19 Feb 22:38

This 3D Printed Arduino-Based Hexapod Robot Can Bust a Move!

Check out the sick moves on this open-source, 3D-printable hexapod robot.

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The post This 3D Printed Arduino-Based Hexapod Robot Can Bust a Move! appeared first on Make: DIY Projects and Ideas for Makers.

Levitate water drops with RGB LEDs and Arduino

Water normally falls from the sky to the ground, the time fountain from hacker isaac879 appears to work much differently. As shown in the video below, water droplets somehow levitate from a circular orange apparatus to a blue one on top.

The trick here is that the water isn’t actually falling up, but appears that way by carefully controlling the flashing of RGB lights using an Arduino Uno. If the lights flash at the same rate as the water drops, they appear to stand still, while if the light is flashed more slowly, they appear to rise.

This is the prototype RGB LED Time Fountain I designed and built. It uses RGB LED strip lights to strobe a stream of water drops to make them appear as if they are levitating. By strobing the different colors out of phase with each other some incredible effects can be created.

An Arduino Uno controls the timing of the RGB strobe and the PWM of the pump. Bluetooth communication was achieved using an HC-05 Bluetooth module and the “Arduino bluetooth controller” app by “Giumig Apps.”

Be sure to check out the video to see it in action, especially the bit around 3:40 where drops appear to rise out of a cup while it’s getting filled with water.

Handheld GPS Tracks All The Things

With a GPS on every smartphone, one would be forgiven for forgetting that handheld GPS units still exist. Seeking to keep accurate data on a few upcoming trips, [_Traveler] took on a custom-build that resulted in this GPS data logger.

Keeping tabs on [_Traveler] is a Ublox M8N GPS which is on full-time, logging data every 30 seconds, for up  to 2.5 days. All data is saved to an SD card, with an ESP32 to act as a brain and make downloading the info more accessible via WiFi . While tracking the obvious — like position, speed, and time — this data logger also displays temperature, elevation, dawn and dusk, on an ePaper screen which is a great choice for conserving battery.

The prototyping process is neat on this one. The first complete build used point-to-point soldering on a protoboard to link several breakout modules together. After that, a PCB design embraces the same modules, with a footprint for the ESP’s castellated edges and header footprints for USB charing board, SD card board, ePaper, etc. All of this finds a hope in a 3D printed enclosure. After a fair chunk of time coding in the Arduino IDE the logger is ready for [_Traveler]’s next excursion!

As far as power consumption in the field, [_Traveler] says the GPS takes a few moments to get a proper location — with the ESP chewing through battery life all the while — and plans to tinker with it in shorter order.

Not all GPS trackers are created equal: sometimes all you need is a stripped-down tracker for your jog, or to know exactly where every pothole is along your route.

[Via /r/electronics]

Hack a Day 19 Feb 19:31
arduino  esp32  gps  gps hacks  handheld  travel  

Play Striker Air Hockey on a capacitive touch surface

After discovering capacitive touch interactions with a Makey Makey device and an Arduino Leonardo, Jason Eldred realized it could also be used to control the Unity game engine. After a night of hacking, he had a basic interface that could change the scale of a virtual circle. From there, he teamed up with Alex L. Bennett to produce an art installation called Bee that invited users to interact with it by physically touching a panel to change graphics on the panel itself and a screen in front of them.

While not meant as a game per se, after more experimentation including work by Gabe Miller and Dustin Williams, this interactive display method was finally turned into a virtual air hockey table via a giant crisscrossing grid of copper tape and wires.

In the game, two players push a virtual puck projected onto a horizontal surface for colorful AR interactions at a very low cost. You can see it in action below, and read more about the project on DigiPen’s website and in Gamasutra’s recent article.

Turning A Car Into A Computer Mouse

[William Osman] and [Simone Giertz] have graced our pages before, both with weird, wacky and wonderful hacks so it’s no surprise that when they got together they did so to turn Simone’s car into a computer mouse. It’s trickier than you might think.

They started by replacing the lens of an optical mouse with a lens normally used for a security camera. Surprisingly, when mounted to the car’s front bumper it worked! But it wasn’t ideal. The problem lies in that to move a mouse cursor sideways you have to move the mouse sideways. However, cars don’t move sideways, they turn by going in an arc. Move your mouse in an arc right now without giving it any sideways motion and see what happens. The mouse cursor on the screen moves vertically up or down the screen, but not left or right. So how to tell if the car is turning? For that, they added a magnetometer. The mouse then gives the distance the car moved and the magnetometer gives the heading, or angle. With some simple trigonometry, they calculate the car’s coordinates.

The mouse click is done using the car’s horn, but details are vague there.

And yes, using the carmouse is as fun as it sounds, though we still don’t recommend texting while driving using this technique. Watch them in the videos below as they write an email and drive a self-portrait of the car.

A perhaps safer but equally fun approach is to turn your car into a game controller by tapping into the car’s CAN bus and converting the steering wheel, peddle and other messages into joystick commands.

Hack a Day 19 Feb 03:00

Underwater Logging for Science

Logging data with an Arduino is old-hat for most Hackaday readers. However, [Patricia Beddows] and [Edward Mallon] had some pretty daunting requirements. Their sensors were going underground and underwater as part of an effort to study conditions underwater and in caves. They needed to be accessible, yet rugged. They didn’t want to use batteries that would be difficult to take on airplanes, but also wanted more than a year of run time. You can buy all that, of course, if you are willing to pay the price.

Instead, they used off-the-shelf Arduino boards connected together inside PVC housings. Three alkaline AA batteries are compact and give them more than a year of run time. They wrote a journal paper to help other scientists use the same techniques for the Sensors journal published by the Multidisciplinary Digital Publishing Institute.

If you regularly read Hackaday, you probably won’t find the electronic part of the build remarkable. However, that’s kind of the point, as this is all off-the-shelf and inexpensive. They do however modify the boards in some cases to allow the controller to power them down, for example.

In fact, they put a lot of thought into reducing power requirements. Since your eye is more sensitive to green, for example, they use green LEDs with very low currents as indicators. They also speed up the serial bus going to sensors because they found that the increased power required was more than offset by finishing the transaction faster (and, thus, going back to sleep sooner).

The PVC enclosures are also interesting. The paper shows some practical deployments in some very harsh conditions. If you want more practical details, the Cave Pearl project has been blogging about their development of these loggers for a while. They have a good “how to” page, as well.

If an Arduino seems too last-year for you, we’ve seen long-duration logging done with ESP8266s and ESP32s. However, they did use lithium-ion cells. Spoiler alert: The ESP8266 lasts longer than the ESP32. If you want to minimize power when sending things out over a network connection, consider MQTT.

Arduino Keyboard is Gorgeous Inside and Out

While the vast majority of us are content to plod along with the squishy chiclet keyboards on our laptops, or the cheapest USB membrane keyboard we could find on Amazon, there’s a special breed out there who demand something more. To them, nothing beats a good old-fashioned mechanical keyboard, where each key-press sounds like a footfall of Zeus himself. They are truly the “Chad” of the input device world.

But what if even the most high end of mechanical keyboards doesn’t quench your thirst for spring-loaded perfection? In that case, the only thing left to do is design and build your own. [Matthew Cordier] recently unveiled the custom mechanical keyboard he’s been working on, and to say it’s an elegant piece of engineering is something of an understatement. It may even better inside than it does on the outside.

The keyboard, which he is calling z.48, is based around the Arduino Pro Micro running a firmware generated on, and features some absolutely fantastic hand-wiring. No PCBs here, just a rainbow assortment of wire and the patience of a Buddhist monk. The particularly attentive reader may notice that [Matthew] used his soldering iron to melt away the insulation on his wires where they meet up with the keys, giving the final wiring job a very clean look.

Speaking of the keys, they are Gateron switches with DSA Hana caps. If none of those words mean anything to you, don’t worry. We’re through the Looking Glass and into the world of the keyboard aficionado now.

Finally, the case itself is printed on a CR-10 with a 0.3 mm nozzle and 0.2 mm layers giving it a very fine finish. At 70% infill, we imagine it’s got a good deal of heft as well. [Matthew] mentions that a production case and a PCB are in the cards for the future as he hopes to do a small commercial run of these boards. In the meantime we can all bask in the glory of what passes for a prototype in his world.

We’ve seen some exceptionally impressive mechanical keyboards over the years, including the occasional oddity like the fully 3D printed one and even one that inexplicably moves around. But this build by [Matthew] has to be one of the most elegant we’ve ever come across.

[Thanks to DarkSim905 for the tip]

Water speakers enhanced with an Arduino Mega

Maker “cool austin” is a fan of water speakers, which pulse jets of water inside plastic enclosures to the beat of your music, but thought they could be improved.

What he came up with is a multi-tower setup that not only dances with light and water to the beat of the music playing, but splits up the pulses into frequencies a la a VU meter.

The project uses an Arduino Mega—chosen because it has sufficient PWM outputs to control the water and lights in five of these enclosures via MOSFETs—to output signals to the water units for an excellent audio-visual display.

Water speakers from the store are great to watch, but I felt they could do more. So many years ago I had modified a set to show the frequency of music playing. At the time I used the Color Organ Triple Deluxe II, combined with a set of photocells potentiometers and transistors I was able to get a set of 3 speakers to function.

I then a few years ago had heard about the IC MSGEQ7 which has the ability to separate audio into 7 data values for an Arduino to read. I utilize an Arduino mega 2560 in this project because it has the required number of PWM pins to drive five water towers.

You can find more details on the water speaker equalizer here, and see it in action below!