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I know everyone has done this before. RFID and arduino that is. But looking at the example code it looks like the antenna is always in receive mode. I am not sure how this affects the life of the chip / reader but I thought of adding a way to detect human presence before activating the receiver.
I found some little IR heat detector (here: www.allelectronics.com/make-a-store/item/IRD-10/INFRARED-... and tossed together some analog read code and viola. Now when the IR detector detects over a certain variable heat temp it activates the RFID reader.
I will post the code and write up on my blog.
I think I have some scaling thing setup wrong. I almost wish there were a few 'test shapes' in the software so I could hit 'draw a circle' and have it draw it out, so I could see if it's round, etc...
Part of my Polargraph re-build:
Arduino-based home made robot, wheels spinning thanks to a few lines of code! Picture by Tristan Nitot
this weekend i was forced to stay at home. but looking tv all the time is boring, so i made a small weekend project.
a magnetic charged pendulum wits a pov display.
top left = servo with magnet pusher
bottom right = coil which goes to the analog-in of the arduino to sense the pendulum via induktion and triggers the pisher and the animation.
on the pendulum = 7 leds pov display
there is much room for improvement, but for a qiuck and dirty 1st try, it is not so bad. ;-)
Arduino Micro with 2 Adafruit PIR motion sensors. The PermaProto board fits *almost* perfectly in the project box, a very slight amount of dremel tool work gets a perfect fit. The Micro is very low profile so it fits fine with the PIR unit.
Arduino with game controller buttons triggering MIDI shield and running output through an amplifier to old Apple speakers. 3D Printed faceplate for buttons and speaker jacks. Neopixel changes colors when a button is pressed.
Arduino. Reunión del grupo de hardware libre. Control de Motores paso a paso y aplicaciones en fotografía
13.11.2013 18:30h - 20:30h
Lugar: Cantina (planta baja/basement)
Seguimos trabajando y descubriendo las posibilidades de esta plataforma de electrónica abierta para la creación de prototipos basada en software y hardware flexibles y fáciles de usar. Se creó para artistas, diseñadores, aficionados y cualquiera interesado en crear entornos u objetos interactivos.
Este miércoles trataremos el control de motores paso a paso y sus aplicaciones en fotografía.
Connecting an Apple II keyboard to a computer with USB is surprisingly easy with a Teensy board. The Apple II uses an ASCII keyboard, which means that rather than returning scan codes, it returns a 7-bit ASCII value. This also means you can't read the state of modifier keys like shift or control independently. The Apple II keyboard in particular doesn't even support lower-case letters (though I've made a bit of a hack for this). They even re-use a couple alpha keys for other characters, so shift-P makes @ and shift-N makes ^. Other late 70s/early 80s home computers like the TRS-80 had a really simple layout like the Apple II's (though the TRS-80 had all four arrow keys but no Control key). I may have to try out adapting some other weird old home computers as USB keyboards -- the C-64 seems like it would be a good shape/size for that. (from afiler.com)
Arduino (Teensyduino) code is available at github.com/afiler/keyduino.
An arduino-based hangman prototype that uses a 16x2 LCD display, a potentiometer to scroll through the letters, button to select and speaker for sounds. Now to build a box!
So I got the sparkfun LSM303 breakout board working last night. Trouble is the I2C bus needs not higher than 1.8v logic levels to work properly.
The level shifter is capable of doing this, but it needs a 1.8v supply to operate, hence the white wire tapping it off the breakout board.
(The two yellow wires are due to the library pinout of the arduino nano board being bad)
Compass board:
www.sparkfun.com/products/9810
Level converter:
www.sparkfun.com/products/8745
Useful library for reading data:
Base board, without printed board layout. This is the pin set AFTER the chip has been bootloaded, otherwise you need pins running to the 3rd, 4th, and 5th pins up from the bottom right.
Arduino Academy, a 3-day summer programme for students in New Zealand, 7-9 July 2014. Catalyst IT was the organizer.
Elaborado sobre plástico flexible, este Arduino es un ejemplo de lo que se puede hacer siguiendo la técnica de David, autor del blog sewboard.cancamusa.net/
PCBs for a combined magnetometer and/or cloud detector.
Magnetic field measurements are taken from a Stefan-Mayer FLC100 sensor. Cloud detection is by measuring the 'sky' temperature. Low temperatures suggest clear skies and higher temperatures indicate the presence of cloud. A humidity sensor is also fitted to help predict the clear sky and cloudy sky temperatures. The Embedded Adventures lightning sensor module can also be fitted.
The sensor shield in intended to fit on my Calunium Arduino clone but it can also be used with an Arduino Mega2560. Design files, firmware and software are all open source (Creative Commons Attribution-ShareAlike 3.0 for hardware, GNU GPL v2 for software). github.com/stevemarple/AuroraWatchNet
the faint glow on the led is infra red light, invisible to the eye, but visible to the sensor in my camera.
Here I'm using the arduino to control the dvd player. I just need play/pause and the dv->out button.
Preliminary PCB layout for Calunium v2 Arduino clone using the ATmega1284P microcontroller.
Silk screen to be cleaned up after the component placement has been finalised.
For more information see blog.stevemarple.co.uk/.
Arduino clone with on-board DS1307 real-time clock. The layout is designed for easy assembly and maximum compatibility with the Arduino Uno, with additional functionality being compatible with the Arduino Mega2560. The auxiliary power connector and optional LM61 temperature sensor are not fitted on this board.
Eagle PCB design files available under Creative Commons Attribution-ShareAlike 3.0 Unported (CC BY-SA 3.0) licence, github.com/stevemarple/Calunium
Arudino ethernet shield, use Microchip's ENC28J60 SPI ethernet controller --
open-source Arduino ethernet library is available at www.nuelectronics.com