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Bruno Facca · 10-08-2002, 10:19 PM

I'd like your opinion on some temperature reading methods I will describe, I know none of them is very reliable but that's all I could think of, any new ideas are welcome.

I was looking into building a SMBUS interface using the maxim 6557 IC or similar but they're not available in the city where I live. I also couldn't find *any* digital thermometers other than those used to measure fever . So far I can only think of a few, not so good alternatives to the original mother board (socket) thermistor:

- If the thermal diode inside the palomino's core is similar to the one in the mobo I could just rewire the mother board so it reads from the internal diode, but I don't know the specs for the mother board diode and looks like that would be to easy to actually work, what you think?

- I didn't looked at it yet but most mother boards have an area in the inside of the socket that has no copper tracks, components or anything, if a reading from below the core (a temp sensor touching the bottom of the processor) is reliable I'll make a hole in the mother board for the wires and put a temp sensor in there there

- A thin (but wide) copper "bar" that goes below the water block, touching the core, having a temp sensor soldered in the other side (right below the water block) insulated from the water block with, well, something... My temp sensors don't fit between the block and the core.

- As suggested, just pointing a fan at the socket to improve heat convection (or is that irradiation? can't remember) from the CPU to the mother board thermal diode, after all they were designed to work with some air turbulence around them and they calculate the temp predicting air movement caused by a heatsink and not water cooling.

That thermometer I made for measuring water temp is fluctuating a bit (just like 1 degree), probably because of electrical noise so I'm re doing in, this time with better grounding in the PCB and all shielded cables, if anyone is interested in making one of these for yourself it's based on the IC 7107, just ask and I'll post a link to the schematics.

Thanks
Bruno Facca

10-08-2002, 10:19 PM	#87
Bruno Facca Cooling Neophyte Join Date: Jul 2002 Location: Brazil Posts: 70	I'd like your opinion on some temperature reading methods I will describe, I know none of them is very reliable but that's all I could think of, any new ideas are welcome. I was looking into building a SMBUS interface using the maxim 6557 IC or similar but they're not available in the city where I live. I also couldn't find any digital thermometers other than those used to measure fever . So far I can only think of a few, not so good alternatives to the original mother board (socket) thermistor: - If the thermal diode inside the palomino's core is similar to the one in the mobo I could just rewire the mother board so it reads from the internal diode, but I don't know the specs for the mother board diode and looks like that would be to easy to actually work, what you think? - I didn't looked at it yet but most mother boards have an area in the inside of the socket that has no copper tracks, components or anything, if a reading from below the core (a temp sensor touching the bottom of the processor) is reliable I'll make a hole in the mother board for the wires and put a temp sensor in there there - A thin (but wide) copper "bar" that goes below the water block, touching the core, having a temp sensor soldered in the other side (right below the water block) insulated from the water block with, well, something... My temp sensors don't fit between the block and the core. - As suggested, just pointing a fan at the socket to improve heat convection (or is that irradiation? can't remember) from the CPU to the mother board thermal diode, after all they were designed to work with some air turbulence around them and they calculate the temp predicting air movement caused by a heatsink and not water cooling. That thermometer I made for measuring water temp is fluctuating a bit (just like 1 degree), probably because of electrical noise so I'm re doing in, this time with better grounding in the PCB and all shielded cables, if anyone is interested in making one of these for yourself it's based on the IC 7107, just ask and I'll post a link to the schematics. Thanks Bruno Facca