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Unread 31-07-2013, 22:03
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jwallace15 jwallace15 is offline
What am I going to do with my life?
AKA: Wally
FRC #0068 (Truck Town Thunder)
Team Role: College Student
 
Join Date: Aug 2012
Rookie Year: 2013
Location: Michigan
Posts: 435
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Re: Arduino + Ethernet Shield Help

Quote:
Originally Posted by techhelpbb View Post
So you need to put something between your Arduino and that board if those numbers are even close to correct.
What sort of thing are you talking about? Resistor? Transistor? 1000µf capacitor?

(ok the capacitor was a joke but still, do you mean a transistor?)

I did notice when I first started using it that strange things would happen.. Such as when I'd try to close the circuit for all 8 relays that the LED's would dim and only 4 relays would click. I also had trouble with the digital input pins (I have emergency stop buttons on the control panels, and was trying to get it so that if the buttons were pressed it would turn on a relay that closed the circuit for a very bright red LED matrix to simulate a warning light) when the relay was activated.

I got my R3 from a kit off of Sparkfun and it included a toy motor to switched on by a transistor (but run off of the Arduino +5v output). It also had a temperature sensor. One day I was trying to simulate a thermostat by entering in a selected temperature into the Serial Monitor, and then if the current temperature was above the entered temperature it would turn on the motor. I'm not sure what happened but the temperature sensor started giving me bogus readings of 500+ degrees (it was not a programming error as I tested it with a code I had written before that worked fine). I think possibly I burnt out the sensor?

/tangent

Anyways, are you suggesting adding a transistor between the Arduino and the relay?

(and by the way for any of you wondering, "In that picture.. Is that an air pressure gauge on the left? And pneumatic tubing in the background?" well yes. I have pnuematics on my train set. Problem? )
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J Wallace IV
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Last edited by jwallace15 : 31-07-2013 at 22:09.