Utilizing a switch or selector to change the probe resistance


 
C

CGill

New member
I just wanted to make a suggestion, I don't know if its possible or not, but since the different brands of probes require different resistance, maybe add to the board a switch or some way to select different resistances based on the probes you'll be using.

Is that possible?

I just finished building my HM and to use my existing Maverick 732 probes I now need to go back and unsolder/resolder in some new resistors.

I'm sure there's already an answer to this but just in case it hasn't been brought up before.

Thanks!
 
You could actually easily make a switch using the PROBE header and a SPDT switch. I wouldn't think that someone would be switching probe types ever so there's really no need to make a switch. It's one way or the other.

The ET-732 probes aren't great and you don't have to change the resistor from 10k to get them to work. They are really noisy and one bad reading can throw out the whole 1 second measurement period, however this dropout is reduced with the upcoming firmware (instead just giving you the noisy data). You could try the snapshot from the online repository and see if it is better for you. Changing the resistance doesn't make them unnoisy it just reduces the chance that they drop out due to hitting the limits.
 
What is the url to the snapshot repository?

And by snapshot do you mean overwriting the sdcard with a new image file?
 
No, just the AVR firmware. Go to AVR Firmware -> Online Repository and flash the one that has "snapshot" in the name. Switching back is just flash the "bundled" hm.hex.
 
Thanks Bryan for your suggestion, I'll try that, I also put some Thermoworks probes on order.

Its my first time using Heatermeter and I may make some for friends, so I wanna make sure I get all the right components together.
 
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