Using Inexpensive 433 MHz RF Modules with Arduino

Learn how to build projects with those cheap 433 MHz RF modules. Everything you need to know!

There are a number of options for adding wireless communications to your Arduino projects, each of which has its advantages and disadvantages.

Bluetooth is a popular option for controlling an Arduino project with your phone, tablet, or a nearby computer. WiFi is ideal if you are building an Internet of Things (IoT) device that you want to integrate into your home network. And the popular nRF24L01 modules are ideal for two-way communications between Arduinos.

But if all you need is a simple one-way wireless link between two Arduinos then there is a simple solution that will cost about the same as a nice cup of coffee.

Inexpensive 433 MHz modules can provide low-speed data communications between Arduinos. Aside from being dirt cheap, they are easy to use. They are perfect for getting data from remote sensors or building a simple RF remote control.

In this video, I’ll explain how these modules work and how you can use them to send data between two Arduinos. We will also build a wireless temperature and humidity sensor using these cheap RF modules and a DHT22 sensor.

Here is what is covered in the video.

00:00 - Introduction
01:56 - Communications Regulations
03:55 - 433 MHz Modules
05:16 - Antenna Considerations
06:42 - Amplitude Shift Keying
10:58 - Demo 1 - Sending & Receiving Data
19:37 - Demo 2 - Remote Temperature & Humidity Sensor

Hopefully, this will inspire you to use these modules in your own projects.

And if you enjoyed this video please like it and subscribe to the DroneBot Workshop YouTube channel!

[TinFoot]

Video quality as well as crisp graphics are to die for. I particularly like the way you display hooking up wires. The colored line that starts from one point then seems to run across the screen until it terminates is very clever. Thank you for taking the time to create each project. I know it is time consuming.

[mrmatias]

I wish I could spend my summer internship with you mentor. Indeed, you’re gifted teacher. 🎖🎖🎖All the best from Angola 🇦🇴

[alibayati]

Bill ... you and your workshop are fantastic.
One of the best educational channel for Arduino, on youtube!
Keep going dude ! :-)

[randydrennen]

Exceptional! Yours is the first channel I have ever subscribed to. And I am a technician/engineer with almost 40 years experience. It is that good.

[carlossolorzano]

This video literally saved my life right now... This channel is amazing, very clean video, very well explained, thank you so much

[ThomasWassa]

I really enjoy Dronebot Workshop videos! Great job!

[jdga]

Thank you so much for making this. This information will really help me with my EE capstone project!!!

[jimweatherhead]

Excellent. Just what I was hoping to achieve with my temperature, pressure and humidity weather station as the British weather can be a little unpredictable. I may even expand it to include wind speed. Thank you very much for a detailed and well explained video. Keep up the good work.

[sumedhburbure]

Your explainations are on point. Thank you for sharing your knowlegde with the electronics community. It helps specially for the beginners like me. Love from India :)

[toms]

Very helpful. Clear and easy to understand

[PakiNewsNetwork]

I've learned a lot from you. Thank you, Sir.

[codebeat]

Very well explained, the antenna length of 17, 3 cm is a great advise. You said something like there is no split function, maybe it is a good idea to stimulate to create one, a function, and put into your toolbox (a library - toolbox.h|toolbox.cpp) so you don't have to invent the wheel next time you need such function. In the arduino community I dicovered people repeat similar steps over and over again, they using libraries of others however don't create libraries themselfs.

As result, you will notice large sketch files with just a few changes (copy-paste) and horrible to maintain. People must start/must learn to create functions to split the problem into reusable parts/snippets, especially when project starts small and extend over time (it usually does).

Supporting this method of developing a solution will be a great addition to your channel and the very clear explained content. Keep up the good work ;-)

[mikekendig]

I really like all of your videos. Your method of teaching is great. Keep up the great work.

[aaandis]

Thank you so much for yet another very useful video.

[ehvway]

I really love your video's sir!

I really love the neatness of your workshop! A real feast for the eyes and mind!

[arnieuk]

You should have an award for the most tidy workshop in existance! I can't even pull out a matching pair of socks from my sock drawer 😮‍💨 Or are you green screened in front of that workshop in the background ? Nothing appears to have moved in all your videos.

[ehsanrezaei]

amazing project and perfect presenting. I love your work desk!

[salimsaddaquzzaman]

Happy little transmitter has a friend named receiver. Great. Subscribed

[abd-elrahmanmohamed]

You are great in explaining things in awesome style

[httn]

This is really great! Very, very detailed and thorough tutorial.