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in reply to: Ramp Soak and stuff #3749

Is the profile stored as a lot of setpoints at some small increment of time, or as a slope between time points (or otherwise)?

Having the option to specify a ramp rate and a ramp duration (i.e. as distint from a setpoint temperature and ramp duration) would be a nice to have.

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in reply to: Ramp Soak and stuff #3746

The current firmware has ramp/soak functionality.

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in reply to: SSR Output Switching Rate #3943

Hi Rhys,

Actually that sounds like it might be worth looking into. In my current configuration, 0% output from the PID is quite some way off 0% output from the heating element (outlet air temp is around 45C above ambient on 0% output) – I’m quite sure this is not residual heat, due to the cooling profile (see image).

I’m not sure if this is a configuration issue with the osPID firmware, a problem with the front end (I’ve had a couple of issues), or just the limitations of the SSR (leaking current?).

I’m also considering a second temperature input device (only for tracking, not for control purposes); how are you acheiving this with your dual PID?

Cheers,

Troy

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in reply to: SSR Output Switching Rate #3941

Successfully edited the parameter, thanks Rhys!

Below is a profile from my successfully modded popcorn popper (used for roasting coffee), with a 0.25s switching period. Still seems to be some tuning to do, but happy with the performance in general.

The latter part of the profile shows the popper running out of juice in the “cold” weather.

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in reply to: Bluetooth #3948

Thanks for that Rhys. Probably beyond my skills at this point. Would their be any way to use the usb socket itself for access to the tx/rx? I’m guessing it’s not powered though.

I was looking at something like this http://www.ecrater.com.au/p/12261343/arduino-bluetooth-module-slave-wireless?gps=1

And this

http://www.chetanpatil.info/1/post/2011/10/11th-post-testing-bluetooth-module-with-arduino-mega-2560.html

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in reply to: SSR Output Switching Rate #3939

Many thanks Rhys. That is the exact behaviour I’ve experienced (resets to 0.5s when I try to send to the osPID).

I thought I had read something about it (maybe in Brett blog) but can no longer find it!

I’ll give it a crack.

Cheers, Troy

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