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1  Using Arduino / Project Guidance / Re: Arduino automobile hacks on: April 10, 2014, 03:47:41 pm
Hi and welcome,

Your projects seem possible.

Relays...
If you don't want to use transistors, you will need  DC solid state relays.
With a magnetic/coil relay you'll need a transistor since they draw more current
as your arduino can handle.

With multiple coil relays an uln2803-chip may be nice since it has ttl-level inputs and can be connected directly to your arduino-pins. You'll need an flyback diode using coil relays, which is integrated in the chip as well.

Temperature sensor, I haven't worked with an X2, but I guess you could use most kinds of temperature sensors. Making 'm waterproof isn't hard and can be done with glue, epoxy or even 3-4 layers of paint.

RFID, 3 meters is quite a lot, a reader may be quite expensive. Using 2 bluetooth modules or an 433MHz transmitter+receiver is probably less expensive.

Compass, you can buy a single compass, but for a few bucks more you can buy a 9 or 10 DOF-module, housing compass, accelerometer and gyroscope. Besides direction you could record your driving style as well.If you live in the mountains, you can measure altitude as well.

 Automatic lights, it will probably require more... of your attention as usual. If it's still light when you park your car and the switch is still in automatic-mode, you may need to ask your neighbours to push-start the car next morning.....
2  Using Arduino / LEDs and Multiplexing / Re: LED lighting control for my PC lighting on: April 09, 2014, 04:36:04 am
Hi,

An arduino can work stand-alone if you adjust the code. If you like to and already are going to use it in your PC, you could control it with your PC as well.

Powering by USB may be possible, depending on the number of leds, current flowing and type of strip.
Since USB only provides for 5volt and 500 mA it probably isn't a good idea though. Each Led can draw up to 20 mA, there are 3 leds in a single RGB-led and your USB port will probably start to protest if you connect more as 8 RGB-leds.

If you're connecting your project using  a non-powered USB-hub, you'll need to take care other devices won't draw much current as well. Besides, you'll have to find a 5v strip while it probably is easier/cheaper to find a 12 volt one.

But why not use 12 volt ?

If you're using a desktop you already have a 12 volt power supply capable of working with much higher currents.
Personally I just cut off one of the older 4-wire Molex-connectors (Yellow=12v, black=GND, black=GND, Red=5 volt), normally used to power internal peripherals and use that to power projects.

There still will be a limit to the number of leds you can connect this way, each supply has its limits, but you probably can turn your PC into a Christmas tree and light a complete  room.

3  Community / Bar Sport / Re: Are microcontrollers considered to be kiddies toys in real world? on: April 08, 2014, 10:57:14 am
If he's that sure about micro controllers,  challenge him to not... use any system with micro-controller for  just 2 weeks.
My bet is that he'll adjust his opinion within 2 days  smiley-wink
4  Using Arduino / Project Guidance / Re: need help with judge dredd lawgiver lights and sound [IMAGES] on: April 06, 2014, 05:08:43 am
I'd keep the buttons and add a "deaf"-mode button, someone might record your voice and empty your gun smiley

To answer your question, I have no experience with voice recognition, but apparently an arduino can be used.

https://www.sparkfun.com/products/12656
http://www.veear.eu/


Ebay has several ads for this cheaper module as well.

http://www.ebay.com/itm/Voice-Recognition-Module-Arduino-Compatible-/261291298198?pt=LH_DefaultDomain_0&hash=item3cd62ccd96

5  Community / Gigs and Collaborations / Re: Code Help on: March 31, 2014, 04:20:55 pm
You're using the delay()-function with quite large numbers, It probably is best to study the "blink without delay" example.

Problem is that arduino  doesn't do anything except waiting until the delay()-function is finished.

By storing  the result of the millis()  function in a variable, you can check "how late it is" before you  set your servo in a position and continue the loop (do other things). By checking  millis() continuously in the loop as well, you can compare it with the first value and once it's 1000 milliseconds larger,  perform the next step in your servo-routine.

Instead of waiting at one function using delay(), using millis() your  arduino will continuously perform tasks in your loop until it's time for the next  step and you can  do other things while it's not time yet.
6  Using Arduino / Audio / Re: Arduino speakers[novice question] on: March 28, 2014, 07:18:03 am
You can sound tones on a speaker using an arduino + resistor(s), but it will be 8-bit music.
http://code.google.com/p/rogue-code/wiki/ToneLibraryDocumentation

To play music with a better quality, you will need an MP3/WAV-shield or something similar.

7  Using Arduino / Project Guidance / Re: Aquarium Auto Doser - Is this Voltage Regulator Needed? on: March 28, 2014, 05:52:20 am
It indeed seems to be an unnecessary component .

The DS1307 needs 4.5 - 5.5 volts to work, you can't use 12v.
But if your arduino has a 5v regulator or 5v-pin, you could use that as well.

The schematic used is not like it should be by the way.
It mentions GND on pump 1,2, 3 and an Arduino-GND while all are simply GND.
8  Using Arduino / Project Guidance / Re: Play Music fom MusicShield on: March 27, 2014, 05:29:41 pm
Hi and welcome to the forum,

Unfortunately I have no experience with music shields.

There are quite a lot of arduino shields available for all kinds of purposes including music.
Arduino is open source, it's quite popular, and tons of people develop shields.
Giving as much info as you can will there for make it easier to answer your question.

An url where others can find the shield makes it easier to answer your question for example.
You can also post the code using the #-button (message-menu) as well.

To answer your question, you can adapt an example sketch. Your shield probably doesn't use all IO-pins, it should be possible to use unused pins for other functions.
9  Using Arduino / Project Guidance / Re: Plant Moisture Monitor on: March 27, 2014, 07:21:46 am
Hi,

Arduino controllers have an Analog to Digital Converter (ADC) with a resolution of 10 bits.
It gives you the possibility to read a voltage between 0 and 5 volts in 1024 steps (10 bits).

You can calculate the voltage  by  multiplying   (5 /1024) *  the number you get from an analog pin, 800 in this case translates to  about 3.9 volts.
10  Using Arduino / Project Guidance / Re: Camera + Projector + arduino on: March 23, 2014, 11:21:45 am
It may be possible to control movement of the camera and turn the projector on/off.

Handling the data of the camera itself isn't possible. Arduino has very little RAM and is quite slow.
There is a lot... you can do with an arduino, but if you compare an arduino with a PC,  you need an 20-24 year old PC.
(This comparison isn't exact, but it gives you an idea about the possibilities)

You could use a serial camera with an arduino, which may give you the possibility to send a single frame in x-seconds.
(x seconds, since I never used one...) Resolution is probably low.
11  International / Nederlands / Re: Verschil in HEX grootte on: March 22, 2014, 09:23:51 pm
Die ervaring heb ik ook.

Moet wel zeggen dat ik geen  uitgebreide identieke programma's in zowel  bascom als arduino geschreven heb en dus ook niet weet voor hoever de vergelijking dan nog opgaat. Als "afgekickte  Basic-verslaafde" ga ik wel voor C++, daar de ondersteuning talloze malen groter is. Google maar eens wat met Bascom erbij of met Arduino. Onder die laatste houd het aantal resultaten haast niet op.  

Gelukkig kan ik duits, daar is  redelijk wat te vinden voor Bascom-projectjes. In Oost-europesche landen en Rusland is ook het een en ander te vinden, maar  het doorspitten van vertaalde pagina's levert me teveel hoofdpijn op..

Wat ik serieus mis bij Arduino is het gemak waarmee je zo'n beetje elke...  8 bit AVR-controller kan gebruiken. Bij Bascom heb je geen gemekker met zoeken naar bootloaders en specifieke instellingen. Onder Bascom kan je zelfs 8051-controllers gebruiken en zo'n beetje alle instellingen zijn een fluitje van een cent.   Foutjes, waardoor de controller zonder HV-programmer niet meer te herstellen is,  zijn helaas ook sneller gemaakt.

Op zich heb ik nog een stapeltje 2313's en die... programmeer ik met Bascom.  Verder ben ik verknocht aan de Atmega8. Zo'n beetje de goedkoopste, net wat meer ruimte, net wat meer pootjes en standaard  onder Arduino te gebruiken.

12  Using Arduino / LEDs and Multiplexing / Re: Beginner Help on: March 22, 2014, 08:29:03 pm
It can indeed be difficult if you're beginning and it's not a stupid question. 

It is, on the other hand,  also difficult to answer your question since a lot of different addressable led strips exist. 
A similar question would be "I need a tyre",  which raises the question "which model car do you drive ?".

If you're using the same materials  as the facebook page you mention and tell which page it is, it probably is easier to  find/get an answer.
13  Community / Exhibition / Gallery / Re: How fast are you? on: March 22, 2014, 07:50:12 pm
It may.. be possible to handicap the duino, but I haven't checked whether it's possible to use  32.768 KHz crystal. smiley
14  Using Arduino / Project Guidance / Re: Experiment with the MPU-6050 on: February 11, 2014, 11:46:18 am
1.  the MPU-6050 uses I2C to talk with micro controllers. It should be possible to use every standard Arduino for that.  Check the datasheets/docs of your.... MPU-6050-board though, it does have a lot of pins for just I2C. If the second chip on your sensorboard is a small microcontroller, it might use another way of talking with the main board.
Do you have links with more info about both boards ?

2. Apparently the sensor can be configured to work with 3.3 and 5 volt devices. If... it uses I2C you would only need 2 pullup-resistors (5k-10Kohm) and wire.

3.  The boards are quite big by themselves, you can buy smaller sensor boards as well. Arduinos come in different sizes and  is open source, loads of clones exist  and for some it's a sport to build the tiniest boards.

You can design your own board as well, but building it may... be quite hard.  The tinier the components, the more skills are needed to solder them by hand.

Something you could do to test/improve skills is using an old PCB, heating it with a heatgun until the solder is liquid, wipe the components of the board and... placing 'm back using a solder iron. The PCB-probably won't function after that, but it will give you an idea how easy/hard it is to solder a board with tiny components using worthless stuff.

You can  also design a board and contract  a company to assemble it, but that can be quite expensive depending on the number of boards you need.

Using batteries shouldn't be a problem, but to have them last as long as possible you should read how to use the different  power modes of your arduino.
15  Using Arduino / LEDs and Multiplexing / Re: Powering 50 Watts of Leds with Arduino on: February 11, 2014, 06:34:23 am
One small thing I would like to advise you is to test your project before using it and to be very sure it works like you want.
Fish/plants are quite sensitive and they won't like it when a small error would cause non-24hrs days.
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