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in reply to: Ospid tc read problem, my input says error a lot #4076

I have had this issue a few times. Its always been because my TC was grounded.

Also, don’t use the power supply while you have the osPID connected to a pc via the usb.

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in reply to: Change To New User Permissions #4084

Cheers Brett!

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in reply to: Alternatives to proportional time control for output? #4083

Thanks for the response Brett!

Well, apart from coolness factor, there probably isn’t a reason 🙂

If I can figure out how to implement it, I might have a go just for kicks.

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in reply to: New User trying to control Heater #4081

There a still a few of us kicking around, although the spambots have run riot.

You say you are trying to ramp to 48°C. Is this for a sous vide or similar?

Not specifically addressing your question, but perhaps you want to step to 48°C instead?

Next question, what temperature is the thermocouple reading when the SSR stops turning on? What tuning parameters are you using?

The more detail you can provide about the system/problem, the easier to help. 🙂

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in reply to: front end setup #4066

I have had some issues also. The osPID frontend comes with a precompiled application (one for each operating system) – I have had more luck with this.

Good luck!

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in reply to: Thermocouple grounding #3980

Are you sure the thermocouple itself is grounded, and not just the shielding (which I suspect has no electrical connection to the shielding).

I use an unshielded k-type bead thermocouple. I get errors if it makes electrical contact with something grounded.

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in reply to: SSR Behaviour #3994

Sorted this problem. Turns out that the heater/fan arrangement in what I am controlling (a modified popcorn popper) uses a secondary heating circuit to step down from 240V to 24V for the fan. I had the SSR only switching the main heating circuit. I’ve now separated the fan power supply, and am switching both heating circuits. Working well!

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in reply to: Wierd Input error and hard to get no overshoot. #3965

Have you tried powering via dc adapter instead of USB?

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in reply to: SSR Output Switching Rate #3945

Definitely interested in the firmware mods for dual PID. I would also love a diagram or some information describing the function of the various parts of the code. I’m getting lost in it all.

Figured out the cause of my cooling problem. Turns out a secondary heating element was being used to drop the voltage to the fan, which was still powered even when the osPID output was 0!

Separate power supply sorted that out.

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in reply to: RTD sensor (pt100/pt1000) input card? #3837

Brilliant! Will we have to make our own firmware/front end software to use it?

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in reply to: PORTING OSPID FRONTEND TO ANDROID #4048

Could you provide any details of how you added bluetooth?

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in reply to: Tuning For Sous-Vide Control #3699

Is your sous vide stirred at all? I’m guessing not and I suspect that the heating you see after the output falls to zero is actually from the fluid temperature evening out (that is to say, the temperature you are measuring is not the mean temperature of the fluid), as opposed to the residual heat of the element.

Can you move the temperature sensor closer to the element? (Not too close though).

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in reply to: RTD sensor (pt100/pt1000) input card? #3835

Just wondering if there had been any progress on this? Apologies if this has been posted elsewhere, but the forum software wont let me search ‘RTD’.

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in reply to: Front end serial error #4031

How are you powering the device?

There has been some discussion about the front end and setting retention already.

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in reply to: Espresso application #4026

Have you tried doing 3 or 4 steps instead of ramping? Reducing the switching time?

Also, how is your thermocouple placement?

The other thing you could try is manually controlling the output, before switching to auto?

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