HI Drew, I have not used a thermocouple on the beaglebone it's self. I have however used a SPI interface MAX31855, and they ramp up fairly quickly, and are reasonably accurate. We used this for a convection oven to reflow oven conversion. In testing, it seemed to work really well, but we never actually used that oven to flow boards. Instead we decided to change to an IR oven.
As far as placement, I think you would want to place the cable end directly onto the processor die, with a bit of heat sink grease between both. Another option would be to use a 1-wire temperature sensor. I have one here connected to a beaglebone at this moment, but I could not tell you offhand what the part number is . . . So it's my understanding that these 1wire sensors in not as accurate as a thermocouple. However I think I could work well enough. As far as placement of these . . . well I'm not sure about that. A datasheet would need to be referenced. But perhaps directly on the processor it's self as well with a bit of thermo grease between the two ? Not sure. They're a similar package to a small transistor. Additionally, these are rather slow in response. I think the best 1-wire query "speed" is 750ms between reads. But I think if you need to read temperatures faster than this for this particular application . .something else is "wrong" ;) -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CALHSORpAO-0p6EykSnmsUvGXNK4q_AYTRvAOJ1yQFbTS0NvZaA%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.
