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In most countries these modules are legal for use providing the following conditions are met: You can check out this Wikipedia list to find the regulatory body in your country. In the UK the Office of Communications or OFCOM takes care of the allocation of radio bandwidth. The CRTC or Canadian Radio and Television Commision sets the laws in Canada. The Federal Communications Commision or FCC is the governing body in the United States and its possessions. It is imperative that you are aware of the laws concerning using these modules in your country! Failing to abide by these rules can land you in a lot of trouble.Įvery country has a regulatory body responsible for radio communications.
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These regulations will differ depending upon what area of the world you live in. Staying Legalīecause we are experimenting with devices that transmit radio waves we need to be aware of the regulations regarding unlicensed radio transmitters. We’ll discuss antennas in a moment but before we do it’s vital that we talk about the legalities of using these (and other ) radio modules in our projects. The modules both have a connection for an external antenna. The modules are also very tiny, allowing you to incorporate a wireless interface into virtually any project. The remaining connection is for data in on the transmitter and data out on the receiver.
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The modules are extremely easy to use, each module has only three connections (the receiver has 4 pins but two are internally tied together) and two of those connections are for power. They are manufactured by the millions and this keeps their cost to an absolute minimum. One of the reason for their low cost is that these modules are used in many electronic toys, games and also in key fobs for automobiles. They can often be obtained for less than two dollars for the pair, making them one of the most inexpensive data communication options that you can get. These modules are available on eBay, Amazon and a myriad of other places. They are easy to use and won’t break the budget. The solution we will discuss here involves the use of super inexpensive (i.e cheap) wireless modules that can provide one-way communications capabilities over a reasonable distance. Still they are an excellent choice and we will indeed visit this option – but that’s for another article. They can also cause interference with routers and cordless phones if you aren’t careful. And they can communicate over a considerable distance with the right antennas.īut the nRF24L01 can be a bit tricky to implement and if you don’t need 2-way communications they are a bit excessive. In many ways they are the ideal solution to many wireless design problems. The nRF24L01 modules are popular choices, they don’t cost a lot and can provide reliable 2-way communications between two Arduinos. And of course it will only work if you actually have an existing WiFi network. For an IoT (Internet of Things) device it is the perfect choice.īut WiFi can be an overkill if you only have basic requirements, it can cost a bit of money and also needs to be authenticated onto your network properly or it can become a security risk. WiFi is another good choice, using WiFi will allow your project to interact with all of the devices on your existing network. You’ll also need to pair it with your device, although that isn’t particularly difficult. It also requires you to build an app which may be more than you want to take upon yourself.
Arduino virtual wire library Bluetooth#
You can create a custom app to give your project a real professional look, equivalent to anything you can buy commercially.īut Bluetooth can also be an overkill if you just want to send a bit of data from a sensor or keypad. It is popular and will allow your Arduino project to be controlled with the aid of your phone, tablet or computer. Each of them has its own advantage and disadvantage and as adding wireless communications will add to the cost of your product you need to think carefully before implementing anything.īluetooth is often the first choice that comes to mind. There are many methods a designer can employ to add wireless capability to their creations. Learn how inexpensive 433MHz modules may be all you need to cut the cord on your next Arduino design. Today we will examine a low-cost method of sending wireless data between two Arduinos without using wifi or bluetooth.