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1  Using Arduino / Project Guidance / Re: Thermistor on: March 22, 2011, 02:54:16 pm
Dear Georgina

Thank u 4 ur response (short enough :-).

You are hilarious. And I dont mean that in a bad way.

Well so let me answer your question:

1. I bought this  sensor kit:

In there is this sensor:

If you click on Datenbatt (Datasheet in German) you get the pdf I posted here.
I would be happy to know myself which one is mine.

Do Thermistor have the same colorcode as regular resistors?
If so from top to bottom (gold-orange-red)

I thought the whole concept is that the resistance changes with temperature.

2. Code: As mentioned above. Simple Code from the page I indicated. But here it is.
I commented out Celsius to Fahrenheit:

#include <math.h>

double Thermister(int RawADC) {
 double Temp;
 Temp = log(((10240000/RawADC) - 10000));
 Temp = 1 / (0.001129148 + (0.000234125 + (0.0000000876741 * Temp * Temp ))* Temp );
 Temp = Temp - 273.15;            // Convert Kelvin to Celcius
// Temp = (Temp * 9.0)/ 5.0 + 32.0; // Convert Celcius to Fahrenheit
 return Temp;

void setup() {

void loop() {
 Serial.println(int(Thermister(analogRead(0))));  // display Celsius

3. "Do long cables behave differently in these circumstances?"

Dont know. You tell me.

4. "As someone said in another thread-- a glass of water with ice gives you 0 deg. C or 32F deg. -- then you can calibrate your readings as you see fit."

How does the calibration work. After I stick the sensor in a glass of icewater it gets "reset" to zero and then works.
Or is this to know what I am measuring. I am sure that my room did not have 5 degrees.

Thanks a little :-)

2  Using Arduino / Project Guidance / Re: Thermistor on: March 22, 2011, 09:48:16 am
Attached a image of my setup.

Black goes to 5V
Blue goes to GND
Yellow to Anlog Pin 0

Dallas 1-wire seems nice, but I would like to get something going soon.

Any suggestions why my setup does not work?

3  Using Arduino / Project Guidance / Re: Thermistor on: March 22, 2011, 06:08:43 am
Cool. Thanks for that link.
Does this 1 wire digital thermosensor work with arduino?
Do you have a simple working code example for this sensor?

Thanks again!
4  Using Arduino / Project Guidance / Thermistor on: March 22, 2011, 04:30:38 am

I am using this Thermistor:

With this code:

(Simple Code).

I am quit sure that the Temperature I get is wrong.

However the Temperture changed with where I put the resistor.

So if AnalogPin0 and the 10K resistor is near to each other I get 5 Celsius/41 Fahrenheit.

If I put a little breadboard cable in between them I get 334 Fahrenheit.

Both of these values are unlikely.

I am in room with about 15-20 C

Somewhere I read that changing the resistor to a smaller resistance (from 10K to 1K).

Also stating that the temperature range I want to measure should be adapted to the resistor.

I want to measure 0-50 Celsius.
And if outside -50-50 Celsius (Just to be sure)

Is that true?

Thanks for the time.


5  Using Arduino / General Electronics / Re: OptoMOS or PhotoMOS-Relay on: March 11, 2011, 02:59:32 pm
Thanks for the response. I knew I was looking for that. But I got lost finding an actual product that has my specifications. Is there one anyone can recommend. A link to a product?

6  Using Arduino / General Electronics / OptoMOS or PhotoMOS-Relay on: March 10, 2011, 04:41:23 pm
I am looking for help regarding relays.
So I want to be able to output from an Arduino Pin (40mA) a trigger that than makes an OptoMOS or PhotoMOS-Relay switch and than closes a circuit that needs up to 4A and between 3-24 V.
This is for controlling/switching on/off via Arduino a motor.
It would be fantastic if anybody could tell me a product that would be capable to do this.
Thanks for the time!
7  Using Arduino / Motors, Mechanics, and Power / External Power Supply on: February 21, 2011, 02:12:01 pm

I am trying to solve this problem:

Basically what I would like to know is how to hook up an external power supply that supports stepper motors with 5-12 or 12 V.

8  Using Arduino / Motors, Mechanics, and Power / Re: Arduino Uno Motor on: February 09, 2011, 07:30:54 am
This is what I bought:

I dont think I need that power.

What I would like to have is a foolsproof tutorial where every step is explained with the exact components that I have and get one stepper running.

I also bought this here:

Waiting for that to arrive.


9  Using Arduino / Motors, Mechanics, and Power / Arduino Uno Motor on: February 09, 2011, 06:10:08 am
Hello Everybody

I am trying to get a stepper motor running with Arduino.

I read this tutorial:
And I think that could work fine for me.

I bought a 12V stepper motor, which seems to much current the arduino can give.

So I will get an old floppy and try it with the one mentioned.

But since I am really starting to understand all the Voltage and Ampere and Millliampere situation. I would like not to ruin anything.
Therefore can anybody tell me the exact pieces I have to order to make this work.

I have the Potentiometer, I have an Arduino Uno, I have all the wires.
What I miss is the long black thing in the middle of the breadboard. What is that and what exactly is the name to order it.

Also the wiring is made for the duemilanove I believe. Is there a wiring photo for the Uno?

What I ultimativley like to achieve is that this stepper motor powers a plastic feeder that turns after a pressure sensor is pressed.



10  Forum 2005-2010 (read only) / Troubleshooting / Re: Uno recognized as Network interface on: January 20, 2011, 04:01:40 am
Fantastic! Works! Thanks!
11  Forum 2005-2010 (read only) / Troubleshooting / Uno recognized as Network interface on: January 19, 2011, 09:54:21 am
Hi Everybody

I just started the Arduino UNO on a MacBookPro, the lights all turn up and blink BUT my Mac recognizes the Arduino UNO as a network interface/usbmodem.

I uninstalled the software of my wireless modem, because it popped up every time, I connected the UNO. But still the same behavior.

What can I do?
Do I have to install anything else, than the Arduino software?
I also installed the drivers, which are for previous boards.
But it seems that is not relevant for this board.

In serial ports I get this options when I hook up the UNO:


Any help would be great!

Thanks for the time and attention!!

12  Forum 2005-2010 (read only) / Frequently-Asked Questions / Arduino pump on: January 15, 2011, 02:12:26 pm
Dear Everybody

One other project I would like to start involves pumps.
I wanted to have the thinnest pump possible (e.g. Thumb sized) and the equivalent small tubes. This would be controlled by the arduino and after certain time unit with pressure spray out water.

If possible run with a battery.

I couldnt find a lot on this online.
Only really big clumsy pumps.

Since the tubes are so small, they will not need a lot of power I hope and can be run by a battery.



13  Forum 2005-2010 (read only) / Frequently-Asked Questions / Re: Buying decision on: January 15, 2011, 01:52:13 pm
Thanks to everybody, who responded!!
Very interesting answers.
I will read all the things you suggested.

I am trying to power a stepper motor, that moves a certain amount of degrees every unit of time. Ideally I could do that without a computer being connected to the arduino, but rather program the arduino to do that and then let it run by itself.

If that works, I would like to add other sensors to it. Like an infrared reviever and sensor that when I interrupt the infrared beam trigger the motor to move a degree position further.

What I want to avoid is that the arduino or the motor or even worse the macintosh via the usb will take any damage, because I get the power, voltage, current whatsoever wrong.

If there are example tutorials for that I would be happy to know about them.

And one more thing i fear is that the motors might be to weak for that construction.

So the idea to control any motor, is fantastic.
But where can I get more info on how to control a powerful motor.
And even more a powerful motor that might has the appropriate libraries to control.

Thanks again..

Really great feedback

14  Forum 2005-2010 (read only) / Frequently-Asked Questions / Buying decision on: January 14, 2011, 08:42:19 am
Hello Everybody

I am looking to buy a whole set of Arduino components and am total newbie and am therefore quite confused about what to get. And I am in Europe.

What I want to buy:

Arduino, Motor Shield, Motors, LEDs, cable etc (e.g. Servos)


1. What Arduino would be best for this:


2. I wanted to get a kit with motors, motorshield that would work with that Arduino.

I found one at adafruit (cant post the link), but it is called:

Motor party add-on pack for Arduino

Unfortunately from the US. I know they ship to Europe, but it looks like it could last longer.

Is there any European supplier for this kit or a similar version that anybody knows off.

The main reason I want the kit is because I know little about voltages and what motor works with what shield voltagewise.

If anybody knows a simple motor shield combination that works, I would be happy to know about that.

3. If I get a Uno, is there going to be less examples, tutorials because it is so new?

4. If i want to add more sensors?

utrasound, infrared

Do all the shields work with that?
Is it just about the amount of connection, that differs?

Thanks for the attention and sorry if these questions are stupid, but i am just starting off.



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