# Slab Hydronic heating monitoring

**URL:** <https://community.sparkfun.com/t/slab-hydronic-heating-monitoring/38915>\
**Category:** Projects\
**Created:** [February 14, 2020, 10:02pm UTC](https://community.sparkfun.com/t/slab-hydronic-heating-monitoring/38915 "2020-02-14T22:02:41Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![Cwby7](https://avatars.discourse-cdn.com/v4/letter/c/ed8c4c/32.png) [@Cwby7](https://community.sparkfun.com/u/Cwby7)\
**Post date:** [February 14, 2020, 10:02pm UTC](https://community.sparkfun.com/t/slab-hydronic-heating-monitoring/38915/1 "2020-02-14T22:02:41Z")

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I have installed a hydronic radiant heating system that’s embedded in concrete Alabama this includes a snow melt system on concrete stairs.

I have thermocouples already in place. These include incoming and outgoing temps at the heat exchanger and slab temps in different zones.

I want to set up a dedicated tablet that displays graphical data on the temp so I can see the heat times and latent heat capacity of the slabs. so I would need datalogging of 6 or 8 sensors.

So I was looking at the sparkfun blynk board and to use the blunk app to easily do the graphics. But I have no clue how to set this up from the hardware side. A bit out of my league with these kinds of boards. Of course there’s no example of multiple analogue inputs since this is a pretty specific task.

Can you please recommend which boards I would need and how to set it up the multiple temp sensors so I can run Blynk to graph them.

Thanks,

Jamie

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**Author:** ![TS-Chris](https://yyz1.discourse-cdn.com/sparkfun/user_avatar/community.sparkfun.com/ts-chris/32/6057_2.png) [@TS-Chris](https://community.sparkfun.com/u/TS-Chris)\
**Post date:** [February 17, 2020, 8:19pm UTC](https://community.sparkfun.com/t/slab-hydronic-heating-monitoring/38915/2 "2020-02-17T20:19:33Z")

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Hi Jamie.

I’m afraid I don’t carry anything that would work for your project directly with the Blynk board, but assuming you have K type thermocouples, you could use 6-8 of our [[MAX31855K thermocouple amplifiers](https://www.sparkfun.com/products/13266) connected to several [[ESP8266 Thing Dev](https://www.sparkfun.com/products/13711) boards. The Thing Dev is similar to the Blynk board but has some more I/O pins broken out. The Thing Dev also works with the Blynk app.

The MAX31855K boards have a SPI bus and several can share the same MOSI, MISO and SCK pins but you’d need a dedicated CS pin for each breakout.]([https://www.sparkfun.com/products/13711](https://www.sparkfun.com/products/13711))]([https://www.sparkfun.com/products/13266](https://www.sparkfun.com/products/13266))