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Capacimetro con arduino

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tramite adafruit industries blog di johngineer il 15/09/10


LenP17 built a capacitor meter using the new Adafruit Arduino enclosure and LCD. The cap in question is placed in the sweet spot of a 555 circuit, and the resulting frequency is measured, correlated to a particular capacitance, and then displayed by the Arduino.
More info in the forums.
Nice work, Len!


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Termometro con PIC

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tramite Electronics-Lab.com Blog di admin il 02/11/10

This project is digital thermometer based on PIC16F628 microcontroller. The temperature sensor is DS1820 and communicates with the mcu via 1-Wire interface. View schematic and source code on the link below.
PIC Digital Thermometer - [Link]

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5 Tones, 1 Arduino

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Because the Arduino is in such high demand for producing multiple musical tones at the same time; [Jeremy Blum] has successfully figured out the math and other necessaries that will take your once previously single tone producing MCU and turn it into a 5 tone producing machine. unsurprisingly its really just some creative use of PWM control but it all works out in the end anyway and helps prevent you from purchasing additional sound generating chips. This truly does open up some new doors, as [Jeremy] shows with his still in production thingamakit like project: ReacXion.

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TwitBalloon

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Last weekend, Marcus of interactive-matter and I, gave a small introduction into internet of things and ambient devices at the Good School. The idea was to have two devices that show the current volume of two terms on twitter, e.g. love against hate. The demo should show how easy it is to connect the physical world to the internets. Marcus did the software part, so if you are interested in that, visit interactive-matter. I did the hardware part, if you want see that, just read on.

Parts

TwitBalloon
So what is needed to build something like that?
  • Arduino Board with ATmega328
  • Ethernet Shield
  • Breadboard
  • RC Servo
  • Cardboard
  • Hot glue (a lot)
  • Photoresistor, LED and two resistors, 10 kOhm and 100 Ohm
  • Protoboard, small

Build it

Servo with continuous rotation hack
First you have to hack your servo for continuous rotation. A standard servo rotates only from 0 to 180 degrees. You have to hack it so that it rotates continuously forward and backwards. There are many different servos out there and as many instructions how to do that. Just use google. For me it was enough to separate the potentiometer from the servo arm. Important is, that you can still control it like a servo afterwards. That means you still have the red (+), brown (-) and orange (pulse) cable to control the servo. You should also write a small Arduino sketch to check where the motor stands still.
Servo with continuous rotation hack
Now cut a servo holder out of the cardboard and glue the servo onto it.

Glue the holder to some cardboard as basement. Then build a barrel out of coasters and cardboard tube. Cut small holes in one of the coaster. These holes are part of the light barrier to count the rotations. I cut only two holes. Less precision and less work.
Then glue the barrel on the servo.
TwitBalloon Light barrier
Next we need the light barrier. It consists of a light dependent resistor (LDR) or photoresistor and a LED. Both need a an additional resistor in series. The one for the LED is for limiting the current. It is around 100-200 Ohm, depending on your LED. The other one is to form a voltage divider with the LDR. My LDR has a resistance between 2 k and 50 kOhm. I chose 10 kOhm. The connect the voltage divider to an analog port of the Arduino. Place the light barrier beneath the barrel, so that the LED shines through the holes onto the LDR.
Mount the barrel
Next, I wrote a small sketch to test the light barrier. It made the servo turn and tried to detect the light flashes of the light barrier. And it worked!
TwitBalloon
After integrating the software part with Marcus, this is how it looked at our tiny booth.

Conclusion

TwitBalloon
After all it worked very well and showed, what we wanted to show.
Connecting things to the internet is easy.
Although, there is always room for improvements. After a couple of hours, one of the servo motors began to turn, even if it shouldn't. And as there is no longer any direct feedback, only through the light barrier, it turned half, noticed that and turned back. I had to re-run the test sketch to find the new settings for it's zero point. Next time, I would use a) stepper motors or b) a better light barrier, which could detect rotation direction and more holes.

Links

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Equinox Clock

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 Mg 3234

Equinox Clock via HaD. Bram writes -
Ever since my Remote Context Communicator project I'd been walking around with the idea to make a clock in the same style. I just never had the time. Last summer I did and designed and built the thing. And this is the result!

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Ricevitore GPS con arduino

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With SparkFun GPS shield and Nuelectronics LCD keypad shield this project become possible and fairly easy to build as you don't have to take care of hardware and focus on software. So this Arduino GPS receiver is able to do lots of things including: current location display, heading, speed (average and max), distance, bearing, ETA for a way point and date-time.
Project uses a TinyGPS library for easier GPS shield access. So device can be used as normal GPS tracking device the only con is that all information is displayed in text format.

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Calcolare il valore delle resistenze per i LED

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This LED calculator will calculate the current limiting resistor value and rounds the resistance to closest standard 5% resistor value. To use this software you need to enable Javascript in your browser.
LED Calculator – [Link]

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Suonare con arduino

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Playing one tone with Arduino is easy as there is a ready arduino tone library. But there Arduino has enough resources to do much more than one tone. So what about five? So Jeremy Blum decided to tweak Arduino program in order to play five tones simultaneously. For this he used timer and software interrupts to play five notes from pentatonic scale.
As tones are played mostly on hardware level – there is still enough resources to do other tasks that occupy microcontroller like LED matrix control. So, this one project pushes forward Arduino knowledge to new areas.

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Analizzatore di spettro

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Andrei Mehiläinen build this audio spectrum analyzer based on PIC32 proto board. It uses a 320x240px colour LCD and an unamplified audio source can be directly connected like PC's sound card or mp3 player.
Audio spectrum analyzer - [Link]

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Amicus: Arduino con PIC

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Amicus is a PIC microcontroller development system inspired by the popular Arduino board and it is using a PIC mcu instead of an ATMEL.  The Amicus hardware is open meaning schematic and design files are free to download. Also Amicus software and IDE (integrated development environment) is free of charge. Check details on the link below.
Amicus: PIC microcontroller development system - [Link]

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Stampante per muri...

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txtBOMBER via 2020.
The txtBOMBER is a one-hand-guerillia-tool – a machine not much bigger than a pressing iron – that generates political statements on the fly and immidiately prints them on any flat surface. If you feel you are part of our modern viewless generation, the txtBOMBER is the perfect tool for you! Just switch it on, it's powered by a strong battery. And move it along a wall. It's that easy to show your?its?someones? opinion of something?someone?! Hell! You should reconsider if you are keen enough to use it! The txtBOMBER has seven build-in pens to "print" the letters and a micro-controller-brain (Arduino), no need for a computer or any other brain. Oh and it speaks german at the moment ;-)

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Zenta Strike Again! Archer the Biped!

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If you've read this blog at all over the past few years, you'll know we're big fans of Kåre Halvorsen's (aka Zenta) work. Father of the very popular Phoenix Hexapod Kit, A-Pod the ant bot, and more recently the T-Hex Hexapod (available soon in kit form), it's very obvious that our Norwegian friend has an incredible grasp of Kinematics. Some might even call him a Kinematics Kung Fu Master. It's only natural that he would blow us away with his insane math-kinematics skills when he decided to take a shot at a biped walker. Well folks, he did not fail to impress. Utilizing the new Arc-32 board from Basic Micro, armed with only standard hobby servos and an inhumanly good grasp of math, Zenta has created a new biped named Archer.

Okay, so bipeds have been done before, what makes this special? Not only does it have some of the most impressive Inverse Kinematics I've seen on a non-professional level, it utilizes a pretty innovative COG-Shifter mechanism that can slide the battery and onboard controller from side to side to assist in walking. Want to see it in action? Look no further!

Also, if you can't get enough of Kåre and his awesome Norwegian accent, check out this 'behind the scenes' video where you'll be treated to his very impressive workshop and a demo of how he controls his various robots:

Help Spread The Word: TwitThis Facebook Digg MySpace Google E-mail this story to a friend! LinkedIn StumbleUpon Technorati

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Computer per scooter con Arduino

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Kurt Schulz build a Scooterputer which is a scooter computer based on Arduino platform a custom sensor shield and Liquidware touchscreen OLED display. Main features are: [via]
* Battery voltage indicator
* Time and date
* Temperature
* Lean gauge with resettable max L-R indicators
* Current speed
* Resettable max speed indicator
* Odometer
* 2 resettable trip meters
* Latitude and longitude readouts
* Compass heading readout
* GSM/GPRS quad-band cellular module
Arduino-based scooter computer - [Link]

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Sfera a led rotante

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tramite Hacked Gadgets - DIY Tech Blog di Alan Parekh il 20/04/10

spinning-rgb-led-ball_1



Our friend Carl who has been featured here many times in the past for his laser projects has made an improvement to his Spinning LED creation. Have a look at the new Spinning RGB LED Ball.
"Unlike it's predecessor this one has three axes. It was very challenging to build, with a total of 9 slip-contacts, not including the motors. I made it from scrap I had laying around and it took about a week to build. I use standard DC-motors controlled with pulse width modulation, the LEDs are controlled with a modified bike light with adjustable frequency."












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Mark1.5 Coilgun

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mv-coilmaster-mark15-upgrade_2



Our friend Daniel Eindhoven from Megavolts has been hard at work improving on the coil gun that we featured here before. The new circuit modifications allows the gun to fire every second now. The new halogen charge resistors look much cooler also.
"At the moment the only limiting factor for fire rate is the charge time, this is the time the capacitor bank takes to get fully charged. This time can be influenced by the charging resistor, a lower value charge resistor will reduce the charge time but increase the charge current.
The first version of the CoilMaster has a 150W bulb as charge resistor, at the time I was pretty fond of the (relatively) short charge time. But I recently realized that it could be improved by a LOT. This upgrade takes charge time to the next level. In stead of one 150W bulb now  2×1000W halogen tubes are used, the entire charge circuit had to be upgraded to handle the peak currents."






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