# Basic fault finding guide

**URL:** https://discourse.nodered.org/t/basic-fault-finding-guide/16411
**Category:** Share Your Projects
**Created:** [7 October 2019 08:17 UTC](https://discourse.nodered.org/t/basic-fault-finding-guide/16411 "2019-10-07T08:17:12Z")
**Posts on this page:** 1
**Page:** 1

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### Author: ![dynamicdave](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/dynamicdave/32/96_2.png) [@dynamicdave](https://discourse.nodered.org/u/dynamicdave)
#### Post date: [7 October 2019 08:17 UTC](https://discourse.nodered.org/t/basic-fault-finding-guide/16411/1 "2019-10-07T08:17:12Z")

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It's the start of a new academic year and I have a new group of students attending my IoT Club.

To help them get their very first node to work I recently wrote this tutorial guide.

I was amazed how many things can be overlooked or wired-up incorrectly on a very simple circuit.

As with most of my projects, a Wemos D1 Mini is used to provide the control/sensing interface (rather than risking the GPIO pins on a Raspberry Pi) so the guide also covers getting the MQTT settings to match those on the RPi.

[Tutorial guide](http://resources-area.co.uk/node-red-flows/basic_fault_finding.pdf)