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Description
SparkFun Thermocouple Breakout - MAX31855KSEN 13266 The SparkFun MAX31855K Thermocouple Breakout is a simple 14 bit resolution, SPI compatible, serial interface thermocouple digitizer that makes reading a wide range of temperatures possible. A thermocouple works by taking two wires made of dissimilar metals, connecting them at the two ends, and making a temperature gradient between one end and the other (a hot end and a cold one). Once this is achieved, a voltage potential is formed and
SEN-13266
The SparkFun MAX31855K Thermocouple Breakout is a simple 14-bit resolution, SPI-compatible, serial interface thermocouple digitizer that makes reading a wide range of temperatures possible. A thermocouple works by taking two wires made of dissimilar metals, connecting them at the two ends, and making a temperature gradient between one end and the other (a ‘hot’ end and a ‘cold’ one). Once this is achieved, a voltage potential is formed and current flows. The SparkFun Thermocouple Breakout takes a standard Type-K thermocouple in one end, digitizes the temperature measured and sends that data out the other end via a SPI interface, thereby interpreting the data and translating it for you to read!
With the SparkFun Thermocouple Breakout, the thermocouple’s hot junction can be read from -200°C to +700°C with an accuracy of ±2°C while the cold junction, inside the MAX31855K, can only range from -20°C to +85°C while maintaining ±2°C accuracy. The MAX31855K constantly measures the temperature of the cold junction using an internal temperature-sensing diode. The MAX31855K requires a power source from +3.0V to +3.6V (+3.0V nominal) and only draws 1.5mA maximum.
The Thermocouple Breakout is designed to accept a standard thermocouple connector, for convenience and compatibility with probes you may already own. These connectors aren’t necessary, and you could solder a thermocouple directly into the through holes labeled ‘+’ and ‘-’. If you decide to solder the thermocouple directly to the breakout board, it is recommended that the thermocouple be mounted for strain relief to avoid breaking the thin wires. Notches for a zip-tie or wire wrapping have been provided in the PCB opposite the header for this purpose.
Features
- 14-bit Resolution
- SPI-Compatible, Serial Interface
- -200°C to +700°C Temperature Reading with ±2°C Accuracy
- 3.0V to 3.6V (+3.0V nominal) Required
- Accepts Type-K Thermocouple
Documents
- Schematic
- Eagle Files
- Hookup Guide
- Datasheet (MAX31855K)
- GitHub (Design Files)
- GitHub (Library & Example Code)
Shipping Notes
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Exchange/Return Notes
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4.1 ★★★★★
Based on 5 reviews
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Product Reviews
★★★★★ 4
Nice shoes for about a year and a half
Size: 13 Wide, Color: Brown, Size: 13 Wide, Color: Brown
I bought these shoes about a year and a half ago and they are comfortable and look much more expensive than they actually are. Today, I noticed them starting to tear a little bit, but if I can replace them every 18 months for this price, it is probably still a better value than high end shoes. The grip is good for dress shoes and has held up well, and they are a good fit that does not cause blisters from excessive rubbing. I might not choose these if I need to wear them every day because of their lifespan, but for a once or twice a week pair of dress shoes, they are a good value.
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Reviewed in the United States on May 25, 2025
★★★★★ 5
Runs big but great shoe!
Size: 12 Wide, Color: Black
Great looking shoe at a very good price! Runs big, I had to get the next size down for my son.
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Reviewed in the United States on May 17, 2026
★★★★★ 5
Fantastic Shoe for the Price
Size: 9.5 Wide, Color: Wingtip Black
Okay, I’m used to spending big bucks on men’s dress shoes. I’m talking $300 plus for American made shoes. They are recraftable (resole-able) for another $100 each time.
But since Covid, I don’t go to the office as often. One of my black dress shoes needs to be re-soled, and it will be. Just not now.
So I ran into these shoes on Amazon. It’s hard to argue with the price. Literally 10% of what I have been paying. So, are these shoes 90% lower in quality?
The short, simple answer is, surprisingly, no. Just the opposite.
Upon receipt, I inspected them carefully and they looked pretty darned decent. I was looking for any excuse to plop them back in the box and return them. I couldn’t find anything.
I appreciate that the leather upper is smooth and mildly shiny. This is a wing tip style shoe, so I’m impressed that the extensive stitching was evenly spaced. The leather detailing that I expect on a wing tip is also all there.
Inside the shoe, it is lined from the toes all the way to the heel box… nice! And that leather feels surprisingly supple. That is something I would expect on a much more expensive shoe. But definitely not at this price point.
Hmm.
I even liked the wax laces they chose. They are a little thicker and have more than adequate length. The shoe’s eyelets have interior facing metal grommets to protect against stretching and tear out of the leather and helps protect the laces against friction wear, as they are tightened and loosened over time. Now having that detail, at this price point, has raised both of my eyebrows.
Double hmm. Now I am really impressed.
The only thing that I didn’t like was that the stitching—that joins the uppers to the sole—is white. I needed to polish these shoes anyway, so I figured I’d see what would happen if I put black polish on the stitching.
I’m happy to say that the uppers shine up very nicely, to a high gloss. This was done with just a little bit of buffing, using a traditional horse hair bristled brush. And followed by a buffing cloth. Although I didn’t do it, the leather is smooth enough that I probably could have spit shined them.
And those pesky white stitches on the top side of the soles? Well I’m happy to report that they are now definitely black.
Turning the shoe over, I can visually see a lump where the shank is supposed to be. That’s a good thing. Not all shoes have a shank. It helps to support the arch. That’s another nice detail. I am expecting the shank to be plastic at this price point. So I am utterly shocked to report to you that a magnet sticks to the bottom of the shoe. That shank is steel! Now I am amazed! We’re talking mind blown, Purple smoke everywhere.
Speaking of details, I was very surprised to see the nicely done wing tip detailing, from on top of the shoe, carried over to the bottom of the sole. Wow. I have never seen that before. That’s surprising.
Now it is important to point out that the sole is some man made material. Definitely not leather. But that’s okay. Especially in the wet, leather wears out quickly, if you don’t wear rubber over shoes. One less thing to fuss about.
The heel itself has a band/layer of rust brown material sandwiched between black layers. I wonder if that is a cork or bamboo material? Having walked in these shoes, on concrete and tile floors, last week, there is a noticeable level of cush, or give. They will definitely not to be confused with sneakers. But for dress shoes, this is a pleasant and surprising experience.
The first day, I wore them at home, over the weekend and I’m glad I did that. They needed time to adjust to my feet. Any dress shoe that I have ever worn needs that.
But after that, these shoes have been pleasant enough to walk around in at work.
I’d have to say that these shoes give me at least 90% of what I would expect from my $300+ shoes for around 10% of the cost.
In my estimation, at their current price point, they constitute an excellent deal.
And especially if you are just breaking into the business world and need a good pair of interview shoes, these are definitely respectable… just be sure to put black polish on the white stitches.
Oh, BTW, I have wider feet and I ordered the shoe wide. After the initial stretching, they fit nicely.
So, in the final analysis, what do I think? I have to say, yes, these shoes definitely get my recommendation. Especially if price is a huge factor, then these shoes constitute an excellent deal.
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Reviewed in the United States on March 20, 2023
★★★★★ 5
Great dress shoe
Size: 10.5 Wide, Color: Black
Wow. Very impressed with these.
Would purchase again.
Comfortable enough for my teenage son, my husband and I very impressed with their look. Great for any special occasion.
Ours appear to be all leather. Even the sole. These will last a lifetime if cared for.
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Reviewed in the United States on May 20, 2026
★★★★★ 5
Great buy!!!
Size: 11, Color: Dark Brown
Very happy with shoes, color was good. Size was perfect. Comfort was great!!!
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Reviewed in the United States on April 21, 2026
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