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1  Using Arduino / Sensors / Re: Analog light sensor outputs are strange? on: April 07, 2014, 01:31:28 pm
The photo shows an Electronic Brick with two outputs, one Analog, one Digital and 4 pins.

Which output pin are you connecting to??
2  Using Arduino / Sensors / Re: Overpowering a Doppler Radar unit. on: April 07, 2014, 11:07:54 am
Hi John,

Interesting work!

Can you point to the supplier of the units you are using, and also some details / photo of how you built your units?

3  Using Arduino / Sensors / Re: Temp sensor DS18B20 - Serial output not an integer on: April 07, 2014, 11:05:50 am
Several different ways to use these sensors HERE:
4  Using Arduino / Project Guidance / Re: Finding NMEA device connection fault on: April 07, 2014, 11:00:15 am
Find out *why* it needs to be reset and fix it at the source.

What is the wiring to the sensor like? How long?  Check grounding, maybe add capacitor(s) from power to ground AT the sensor.
5  Using Arduino / Motors, Mechanics, and Power / Re: IR Remote codes change when changing speed using Arduino Motor Shield. on: April 07, 2014, 10:57:52 am
So the codes received "change".. are they random, changing values?

Sounds like electrical interference from the PWM switching..  Maybe.

Try shielding the wiring to the IR receiver and separating it from the motor wiring. Try adding a capacitor (maybe .1uF) across the Vcc and Gnd pins right at the IR receiver. 

See the IR info on the ArduinoInfo.Info WIKI HERE:

Let us know what happens; I'd like to add info to the WIKI if possible.
6  Using Arduino / Sensors / Re: How do I use the KY-039 sensor? on: April 07, 2014, 10:28:04 am
I have a couple of these and have never been able to get them to work.

I sell a lot of the Keyes Electronic Bricks and they are good and good value, but I decided to NOT sell this one! If anyone gets it to work, PLEASE tell us how.

Some perspective on the Brick Stuff HERE:

DISCLAIMER: Mentioned stuff from my own shop..!
7  Using Arduino / General Electronics / Re: Arduino program won't stay on when connected to a 12v battery on: April 07, 2014, 10:05:35 am
This sounds like a grounding and possibly EMI (ElectroMotive Interference) problem.

If you disconnect the motor relay does the rest of it work? 

If you ground the Arduino/System to a local ground does it work?

See some about EMI etc. on the ArduinoInfo.Info WIKI HERE:
8  Using Arduino / Project Guidance / Re: New to arduino, automobile application. on: April 07, 2014, 09:57:02 am
Discussion here:
9  Using Arduino / Project Guidance / Re: Arduino Uno running in a car on: April 07, 2014, 09:55:33 am
This has been discussed quite a bit.  Best to use a regulator designed for the Automobile environment; saves a lot of work!


Let us know how it goes..
10  Using Arduino / Project Guidance / Re: Aquaponic Help on: April 07, 2014, 09:51:26 am
There is a LOT of Arduino activity in Aquaponics.

See: for some temperature measurement stuff I worked on with them.
Temperature measurement on the ArduinoInfo.Info WIKI HERE:

Rik Kretzinger's blog:

Also see:

Let us know how it goes...
11  Using Arduino / Project Guidance / Re: SD Card reader module on: April 07, 2014, 09:35:31 am
Rocky has this on his WIKI about this product:

But I don't understand it either! How could it do this??
---------------------( COPY )---------------------
Break out board for standard SD card and Micro SD (TF) card
Contains a switch to select the flash card slot
Sits directly on a Arduino
-----------------( END COPY )----------------------
Ask them at:
Or email Rocky Himself at:

I used to live close to these guys in Nanshan.
12  Development / Other Software Development / Re: Opinion against Arduino platform and some way to improve on: April 02, 2014, 12:23:57 pm
Hi John,

Thanks for the detailed perspective on this.  I too wish library writers (who are usually those who understand the detail better than most)  would comment with more details of the WHY and HOW of what they do with 'lower level' constructs.

IS there any overview anyone has written about the ATmel chips that is somewhere between the spec. sheets and Arduino documents??  I have some fairly high-level stuff here:
(Any suggestions/critique/adders for that welcomed!)

but I'd love to add something with more details for those who wish to go further.
13  Using Arduino / Project Guidance / Re: Linear Actuator Position Control on: April 01, 2014, 12:54:12 pm
I also suspect the red, black, and yellow wires are connected to an internal pot.
I think the KAT may be right. I saw a reference to a "Pot" for the "Controller" they want you to buy to run the actuator.
14  Using Arduino / Sensors / Re: Handheld Low-cost Ultrasonic Sensor with Audio Output on: April 01, 2014, 10:39:25 am
by measuring the clapping frequency and distance to the wall we got a surprisingly accurate estimate of the speed of sound.

I'll suggest that to teachers I work with!
15  Using Arduino / Sensors / Re: Will multiple infrared remotes conflict? /affordable wireless options on: March 31, 2014, 09:52:24 pm
Yes you would expect interference between multiple IR remotes.  If you used Arduinos to build the remote controls as well as the Robots, you could assign different codes for each robot and the others would ignore others. But you still have real-time interference when multiple remotes transmitted at once.


The lowest-cost RF remotes are nRTF24L01. See:

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