Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

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orbitcoms
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Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#1 Post by orbitcoms » 04 Apr 2017, 11:08

I was wondering if there is a plug-in for EasyESP to take readings form MAX31865?

I need a wide range version of temperature node that reads either thermcouple or RTD. The MAX31865 has SPI interface for reading RTD and the MAX31856 has SPI interface for reading Thermocouple.

My project needs temperature to -90 Degrees C.

Alternately, would it be difficult to write a plugin to do this?

Thanks

Regards

Dave

paxi
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Re: Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#2 Post by paxi » 04 Apr 2017, 22:41

Hope you did consider that ESP8266 is only spec'ed down to -40°C. ;)

orbitcoms
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Re: Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#3 Post by orbitcoms » 04 Apr 2017, 23:24

I am not putting the ESP into the freezer, only the thermocouple or RTD probe.

I see the playground plugin has a thermocouple plugin but this does not show up in the list available on my device.

What do I need to do to include the thermocouple plugin for my devices?

Thanks

barnie
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Re: Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#4 Post by barnie » 06 Sep 2017, 12:28

Hi,

are there any news?

I've a PT100 and a MAX31865. How could I configure/implement this sensor in espeasy???

Thanks RUDI

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toffel969
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Re: Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#5 Post by toffel969 » 07 Sep 2017, 21:25

barnie wrote:
06 Sep 2017, 12:28
Hi,

are there any news?

I've a PT100 and a MAX31865. How could I configure/implement this sensor in espeasy???

Thanks RUDI
The pt100 should work as analog
Domoticz on Raspi 2 -- 14 ESP units (hacked Sonoff,NodeMCUs, Wemos, self-built units) running with RC140- Mega 2.0.0 dev8

orbitcoms
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Re: Plug-in for MAX31865 RTD or MAX31856 Thermocouple IC?

#6 Post by orbitcoms » 07 Sep 2017, 23:18

The Analog input cannot be used on its own for PT100 reading. You would also require an excitation current and algorithm for linearisation.

The MAX3185 provides the appropriate interface to the PT100 and allows reading the temperature via SPI. In the end my node needed to do some other stuff so I did not use ESPEasy.

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