I recently got an Arduino Uno and an Arduino Nano and started experimenting.
Soon I also bought a transmitter /receiver pair for 433 MHz— actually three of each because they’re very cheap (about €10 for everything).
This is the transmitter:
And this is the receiver:
The goal of my weekend project was to send a “Hello World!” string from the Nano to the Uno.
First, I wired everything up virtually in Fritzing:
Then I borrowed some code from this blog post, removed most of it and made a few changes.
The transmitter sends the message “Hello String!” every second. To indicate activity, an LED blinks on transmission.
{% gist a9a3a1080f9fc6306e5b transmitter.ino %}
The receiver code is below. There is also an LED in this setup; it blinks whenever the message “Hello World!” is received.
{% gist a9a3a1080f9fc6306e5b receiver.ino %}
The full setup looks like this and worked without any problems:
I left it running all weekend— no issues. The LEDs kept blinking until I unplugged everything.
Done for today!