Modification To Thermistor based component.

[medelec35]

Would it possible to choose whether the thermistor is connected to VSS or VDD?
My circuit has a pull-down resistor, so would be handy if can select either.

Martin

[Benj]

Hi Martin,

Yes that's a good idea. I'll have a play and see how easy it would be.

[Benj]

Right here we go, I've added the change to the base component and exposed that on the next level up,

Thermistor_base.fcpx

(3.94 KiB) Downloaded 303 times

EBM003_Thermistor.fcpx

(83.96 KiB) Downloaded 339 times

Have a play and let me know how you get on.

[medelec35]

Thanks Ben,
Will try it out both ways and will let you know how I got on.
Thinking ahead will it work in V8 when released as well?

[Benj]

Yes I've already applied the mod to the v8 components so fingers crossed this will work well

I've done a lot of recent v7 mods (all of which have been propagated to v8) and so if this works ok then I'll try and do another zip file update so that all the recent v7 bug fixes and additions can be found in a single place.

[medelec35]

Hi Ben,
Mods appear to be working a treat!

Testing on hardware comparing with thermometer and K type thermocouple.

The only minor thing is I entered Min Temp as 0 and Max Temp of 100 as that's the limits cover by the data sheet.
however component still requires -25 and +125 which had to be based on a generic calculation using beta so may affect accuracy?

Martin

[LeighM]

Hi Martin,
That's OK, it will not affect accuracy between 0 and 100
Leigh

[medelec35]

Hi Leigh,
Thank you.
So values outside limits can be left at 0?
Reason for asking is people may not have even rough values to hand.
If OK to put 0, then could that information go in the Wiki help please?

[LeighM]

Hi Martin,
Ah, good point, no, 0 will not work, they would have to be "sensible" values,
i.e. if 0 deg C has the highest (resistance) value then -25 will need to be higher than that.
But the actual value will not matter, unless the temperature moves into that zone.
The component uses linear approximation between the sample points.