# How to connect Arduino Uno to Ignition SCADA

**URL:** <https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268>\
**Category:** Maker\
**Created:** [January 23, 2025, 4:38am UTC](https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268 "2025-01-23T04:38:50Z")\
**Posts on this page:** 4\
**Page:** 1

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**Author:** ![Kathit\_patel](https://avatars.discourse-cdn.com/v4/letter/k/dec6dc/32.png) [@Kathit\_patel](https://forum.inductiveautomation.com/u/Kathit_patel)\
**Post date:** [January 23, 2025, 4:38am UTC](https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268/1 "2025-01-23T04:38:50Z")

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I am trying to control the temperature of a system using Arduino uno(without wifi). I am using a ds18b20 temperature sensor and a dc fan as a final control element. I don't know how to use Arduino uno with ignition scada

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [January 23, 2025, 10:17am UTC](https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268/2 "2025-01-23T10:17:51Z")

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You could use a modbus library and then connect to the uno in ignition via a modbus. I've done this with another scada package before

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**Author:** ![MG3](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/mg3/32/84125_2.png) [@MG3](https://forum.inductiveautomation.com/u/MG3)\
**Post date:** [January 24, 2025, 11:27am UTC](https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268/3 "2025-01-24T11:27:21Z")

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I have done this with Ignition, works a charm. Also, works well on Raspi!

Eitherway @Kathit_patel, as @nminchin has said Modbus is likely the way to go.  
Especially, if you aren't that familiar with Industrial Automation as Modbus is a fairly easy protocol to get your head around and there are many good resources online!

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**Author:** ![nminchin](https://sea1.discourse-cdn.com/inductiveautomation/user_avatar/forum.inductiveautomation.com/nminchin/32/6911_2.png) [@nminchin](https://forum.inductiveautomation.com/u/nminchin)\
**Post date:** [January 24, 2025, 11:52pm UTC](https://forum.inductiveautomation.com/t/how-to-connect-arduino-uno-to-ignition-scada/101268/4 "2025-01-24T23:52:58Z")

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For RPi's I'd use NodeRed. Travis Cox wrote a NodeRed module for Ignition