December 17, 2025
Description
READ IT BEFORE YOU ASSEMBLE IT!
This is the first Whelen siren project that is truly functional and i make this for my 35 Followers special. I know that screws are needed, which is not normally the case with my small models, but this model would be too unstable, and I have listed all the screws below. But BEWARE! The Whelen Hornet sirens can rotate, but they do not rotate continuously; instead, they swing 360 degrees and then swing back. If you want this rotation, no collector rings are required. The rotator is powered by a stepper motor. It requires one speaker, and if you don't know how to install the speaker, you can look at the photos to see how the speaker is wired and installed. Later, you can use Arduino to configure a sound with which to build a control panel. You can find the instructions for the control below.
PARTS YOU NEED
Electrical hardware / Control Cabinet
You can control the sound yourself in many ways and, if you want, use a whelen sound yourself if you have one. The control system is operated entirely with Arduino. If you want the control system, you will need these items.
I am working on the Control Cabinet but i dont know how much time this cabinet take. If the Cabinet is finished i upload the files and the code.
How to Build
First, mount the horn bracket to the horn with the screws. Then tighten each screw firmly with the nuts. If you don't know how, look at the pictures. Now you can take the speaker bracket and glue the speaker into it. Don't forget to solder it and do a test at the end before you glue the cover on. Then pull the cable through the horn to the horn holder and also through the hole there. you can then screw on the speaker holder and tighten it firmly with the nuts. Now comes the axle. Important! Pull the cable through the axle and then glue it on. Now pull the cable through the motor rotator box and then through the rotator gear. Now glue the axle to the rotator gear and then the motor. Now comes a very important step! I made the mistake of not cutting the rotator box.
The motor goes into the holder but you have to push very hard. It's best to cut the model in the slice to make it easier! It is best to cut the model in the slicer so that the upper half still has the holes for the motor and the rotator rod to make it easier to install and glue the motor. The gear wheel that is on the motor can also be put on with some force. It is best to drill a bit to make the hole bigger. The motor must also be glued on. Finally, you can pull the cables through the hole, but with the stepper motor you have to extend the cable a little so that the signal from the Arduino reaches the driver and then the motor. If you want the perfect rotation you can download the code I have included. It might be a bit fast, so you can edit it yourself. The wiring might be a bit complicated. If you have any problems contact me and I will give you detailed instructions.
How to Rotate the Stepper Motor
It is important that you connect the stepper motor to the motor driver and then to the Arduino and an external power source. If you need help with the wiring, you can write it in the comments or look at the Arduino in the photos. You can find the code under Files > Code > wehelenhornet_rotating_code.ino.
I hope thats not too difficult :b but if you want a easier project then go to my profile and check my collection “My Siren Projects” with cool small siren projects. I hope you like this model, and if you have any ideas about which siren I should design next, please leave a comment.
Enjoy :D
License:
Creative Commons — Attribution — Noncommercial — NoDerivatives
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