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 1 Using Arduino / Programming Questions / Re: More than one OR statement? on: January 21, 2013, 12:22:40 pm Ah thats where I was going wrong.  I too was only using one '=' not twoThanks for your help
 2 Using Arduino / Programming Questions / More than one OR statement? on: January 21, 2013, 12:13:47 pm How do I add more than one OR statement?I currently have;Code:if(dT > 0.2 || dT < -0.2) {how do I add another OR statement to it?I want to add x=360
 3 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: November 12, 2012, 01:22:48 pm Quote from: dhenry on November 12, 2012, 10:58:33 amYou can create gain by inserting a resistor between the two 100k resistors and the output.So if I put a 100k resistor in where you said that would give me a gain of 2.What does the 100k resistor thats currently located between the output and ground?I know the circuit I found does not allow for any conditioning of the PWM.  I assume I will need some sort of low pass filter on the op-amp input.
 4 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: November 12, 2012, 10:41:28 am Quote from: Runaway Pancake on November 12, 2012, 10:38:20 amQuote from: StuntMonkeh on November 12, 2012, 09:36:18 amI found this circuit which is a 0-10v output. I'm pretty sure the triangle is an op-amp (LM358M) but what are the transistors doing?You don't like the circuit that I referenced?Oh no, not that... I have an old HVAC controller and found the circuit in some of the documentation so I was trying to understand what was going on.
 5 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: November 12, 2012, 10:39:26 am Quote from: dhenry on November 12, 2012, 10:18:11 amOne to buffer the output and another to limit its current.That circuit requires a 0-10v input.So the transistor with the collector connected to the 24v is to isolate the input signal from the output and the other one is to limit the current.Maybe I was wrong about the triangle being the op-amp.... Might be more to it than that.I'm sure you are right about it needing a 0-10v input but can you explain.
 6 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: November 12, 2012, 09:36:18 am I found this circuit which is a 0-10v output.I'm pretty sure the triangle is an op-amp (LM358M) but what are the transistors doing?
 7 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: November 03, 2012, 05:00:49 am So I could use something like this?http://uk.rs-online.com/web/p/general-purpose-dacs/0402881/
 8 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: October 31, 2012, 09:34:02 am I think I may have left a vital piece of information out.The valve is 24vAC powered.  The 0-10v is just a signal, I don't think the current draw is very high...The 0-10v input expects to see a DC input not a DC PWM.  So I can't just give it a 0-10v PWM signal.
 9 Using Arduino / Project Guidance / Re: Driving a 0-10vDC signal control valve on: October 30, 2012, 11:48:33 am Had a bit more of a search using a variety of terms, unfortunately the search function doesn't like the term '0-10v'.Is this the kind of thing most people are using?http://ruggedcircuits.com/html/circuit__20.html
 10 Using Arduino / Project Guidance / Driving a 0-10vDC signal control valve on: October 29, 2012, 09:29:54 am I have a control valve actuator that accepts a 0-10vDC control signal to dictate the position of the valve.Is there a circuit that someone has used to do this to drive it from an Arduino PWM?I assume the 0-5v PWM needs to be turned into an analog signal and then boosted to 0-10v.Can someone point me in the right direction.
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