AndrewR wrote:I don't have a Arduino Mega/RAMPS with which to play with but there might be a way to combine the following to use an I2C connection. I'm all for the use of TCs due to their durability, ease of installation, and lack of calibrated look-up table. I've got a couple MAX6675 chips being delivered in the next few weeks, so I'll see what I can figure out with a basic Arduino and a Sanguino.
bdring wrote:I use a lot of temperature sensors at my day job. We use thermisters and thermocouples. Thermocouples are nice because they are cheap and easy to make, but they do have their issues. In my experience they tend to be a lot more noise sensitive. They work by two different materials generating a voltage proportional to temperature at the junction of those materials. The voltages are very, very low. Sometimes you can get an apparent step in temperature just by turning on a noisy circuit.
JeremyBP wrote:I would suggest using one of the aux ports on the bottom of the RAMPs board and changing the pin in firmware. I would also suggest using the marlin firmware, as it stably supports the max6675 out of the box.
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