I gave some remarks on the code, which were processed.
If there is a feeling that adding the HeatIndex complicates the example, maybe this example should be a separate file, named "DhtHeatIndexSensor"?
Best posts made by Michiel van der Wulp
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    RE: how to post a new sensor sketch?posted in Development
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    RE: 💬 Sensebender Microposted in OpenHardware.ioOK, I understand. 
 My confusion was caused by the second sentence at https://www.mysensors.org/hardware/micro : "... it operates at 1Mhz ..."
 That's a mistake then?
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    RE: 💬 Code Contribution Guidelinesposted in AnnouncementsUnder "Signing CLA", the link to clahub.com is since long dead. 
 Maybe you can follow this example: https://github.com/chocolatey/choco/issues/2036
 and replace with https://cla-assistant.io/ ?
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    RE: A more convenient Arduino Unoposted in General DiscussionI also have a few of such Arduino Unos with a 3.3V selection switch from the shop "Open Smart" on Aliexpress. 
 See picture at: https://michiel.vanderwulp.be/domotica/Modules/ArduinoUno/#open-smart-3-3v-5v-switchable-uno-specification-1
 They work fine, also on 3.3V.But indeed, running it at 16MHz on 3.3V is out of spec... 
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    RE: A more convenient Arduino Unoposted in General DiscussionI even managed to solder a nRF24L01+ to the board so everything works on 3.3Volt, and this node works fine. 
 This took a lot of scratching copper from the board...