# RTD 8 channel hat with Raspberry Pi 4 (Need help to read temperature from PT100)

**URL:** <https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272>\
**Category:** General\
**Created:** [27 August 2021 11:28 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272 "2021-08-27T11:28:11Z")\
**Posts on this page:** 10\
**Page:** 1

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**Author:** ![cjnavi](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@cjnavi](https://discourse.nodered.org/u/cjnavi)\
**Post date:** [27 August 2021 11:28 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/1 "2021-08-27T11:28:11Z")

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Hi All,  
I am new for node red and using 8 channel RTD HAT with Raspberry Pi4. could you lease help me to configure RTD sensors like PT-100 with given board? with help of Node-red or Python script. Thanks in advance.... 🙂

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**Author:** ![SonoraTechnical](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sonoratechnical/32/20033_2.png) [@SonoraTechnical](https://discourse.nodered.org/u/SonoraTechnical)\
**Post date:** [27 August 2021 19:49 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/2 "2021-08-27T19:49:15Z")

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Can you share the Make and Model of the Board?  
What interfaces are available to the board? (serial, i2c, etc).  
Can you attach links to a user guide, manual or specification sheet?

Raspberry Pi4 has no analog input gpio capabilities, so the values collected from each of those channels is communicated to the pi via something other than simple GPIO pins.

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**Author:** ![Gunner](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gunner/32/43582_2.png) [@Gunner](https://discourse.nodered.org/u/Gunner)\
**Post date:** [27 August 2021 21:36 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/3 "2021-08-27T21:36:58Z")

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@cjnavi perhaps look at the support page for (what I am guessing is) your hardware

> **[8-Channel RTD Data Acquisition 8-Layer Stackable for Raspberry Pi](https://sequentmicrosystems.com/products/rtd-data-acquisition-card-for-rpi)**
>
> Two ADS1248 24 bit delta-sigma converters; Factory accuracy: 0.1%; Max. accuracy (through calibration): 0.01%; Pluggable Connectors 30-16 AWG wires; On-board hardware watchdog, 3A resettable fuse; 8-Level Stackable; Command line, Python library,...

There is a link in there for node-red

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**Author:** ![SonoraTechnical](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/sonoratechnical/32/20033_2.png) [@SonoraTechnical](https://discourse.nodered.org/u/SonoraTechnical)\
**Post date:** [28 August 2021 03:25 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/4 "2021-08-28T03:25:43Z")

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If it's that board, there is even a node-red NODE available for it that communicates over i2c. Interesting stuff.

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**Author:** ![cjnavi](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@cjnavi](https://discourse.nodered.org/u/cjnavi)\
**Post date:** [28 August 2021 04:36 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/5 "2021-08-28T04:36:38Z")

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Thanks for your response....  
I am using Sequent RTD 8 Channel hat for raspberry Pi4..  
[8-Channel RTD Data Acquisition 8-Layer Stackable for Raspberry Pi – Sequent Microsystems](https://sequentmicrosystems.com/collections/industrial-automation/products/rtd-data-acquisition-card-for-rpi) and they have given some process but not in full manner..could you please explain how we can get data from RTD sensor and store the data in a file. we nee 5 samples for second.  
Thanks  
Naveen

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<div class="post-metadata">

**Author:** ![cjnavi](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@cjnavi](https://discourse.nodered.org/u/cjnavi)\
**Post date:** [28 August 2021 04:39 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/6 "2021-08-28T04:39:32Z")

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Yes your guess is correct. The have given node red link for installation only, but i need process for how to read the data from sensor using node red .  
Thanks  
Naveen

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<div class="post-metadata">

**Author:** ![cjnavi](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@cjnavi](https://discourse.nodered.org/u/cjnavi)\
**Post date:** [28 August 2021 04:42 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/7 "2021-08-28T04:42:18Z")

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I am very new for Node red. could you please help me how can use that particular NODE.  
Thanks  
Naveen

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**Author:** ![Gunner](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/gunner/32/43582_2.png) [@Gunner](https://discourse.nodered.org/u/Gunner)\
**Post date:** [28 August 2021 07:05 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/8 "2021-08-28T07:05:39Z")

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> [@cjnavi](#):
>
> The have given node red link for installation only, but i need process for how to read the data from sensor using node red .

No. It is not just for library installation. There is also an [example flow](https://github.com/SequentMicrosystems/rtd-rpi/tree/master/node-red) to read from the (library you must install) to Node-Red.

You just have to spend some time looking at their directions. Otherwise how can we assist when you have the hardware?

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/0/3/03f4ebe4412c5d78784bdceef7ca6a1fd7587037.png) ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/a/1/a122f0d868c34e19d2cc3b0812c658636ad82b7e.png)

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<div class="post-metadata">

**Author:** ![cjnavi](https://avatars.discourse-cdn.com/v4/letter/c/e47c2d/32.png) [@cjnavi](https://discourse.nodered.org/u/cjnavi)\
**Post date:** [31 August 2021 12:19 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/9 "2021-08-31T12:19:13Z")

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Hi,  
Thanks for your support and help, I got the solution after spent lot of time....

 ![image](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/3X/f/6/f65046a2e2a6ca51582661d0e7e1e68375a478a7.png)

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**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [30 October 2021 12:19 UTC](https://discourse.nodered.org/t/rtd-8-channel-hat-with-raspberry-pi-4-need-help-to-read-temperature-from-pt100/50272/10 "2021-10-30T12:19:21Z")

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