How to create a Wireless RF circuit activated by an ultrasonic sensor for interesting project?

Projects General Guidance
2

Just set up separate sketches, one for ultrasonic detection that you think might detect a bird. Another one to transmit a message. Troubleshoot both and then combine them in one sketch with this logic:

repeat {
check US
if (US bird criteria met) {
  send 433MHz message
  }
}

If you have trouble combining the sketches, post them here.

Both the RadioHead library and the Ultrasonic library have documentation and example sketches to get you started.

Do yourself a big favour and learn to work without depending on YT etc. for help. The average quality of information on there is very poor.

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