How can I make a wireless transmitter using arduino without FCC licence?

Using Arduino Project Guidance
1

I want to make a wireless transmitter so I can send wireless messages to my brother at night. But I want to do it legaly. I have no idea what to do. Can someone tell me what I need or point me in the right direction?

2

LORA. Perfectly legal. Check out the 'swiss guy' on YT.

3

If your brother is in the room next to yours, then there are lots of radio modules that could do this in the license free ISM bands.

4

He is in the room next to me so he is less than 50 feet away

5

Can I use a HiLetgo 315Mhz RF Transmitter and Receiver Module link kit for Arduino?

Screenshot 2024-07-18 11.26.14 AM
Screenshot 2024-07-18 11.26.14 AM1365×645 287 KB

6

How would your brother know that you sent him a message? Will you pound on the wall to tell him?

7

A quiet buzzer

8

You need to explain you project a bit more. How will the quiet buzzer know you sent a message?

9

So I want to make a project that I can type into the serial monitor:
lcd.print("Hello!");
and it will display Hello! on the lcd in his room and set off a buzzer

10

In what country do you live?

11

The United States of America

12

Yes, that is possible and legal.

13

Can I use a HiLetgo 315Mhz RF Transmitter and Receiver Module link kit for Arduino:

Screenshot 2024-07-18 11.26.14 AM
Screenshot 2024-07-18 11.26.14 AM1365×645 287 KB

14

See post #12.

15

Thank you! :slightly_smiling_face:

19

Only 915Mhz and 2.4Ghz are legal in the US

2 Likes
20

Thanks

21

You are welcome

22

Then you are needing to make and complete two projects using Arduinos. One transmitter and one receiver.

23

Actually a microwatt is all that is needed this project. Just enough to pass through a wall. ANY frequency would be usable. No one would notice and all would be legal.