{"id":11095,"date":"2016-04-05T22:22:10","date_gmt":"2016-04-06T02:22:10","guid":{"rendered":"http:\/\/embedded-lab.com\/blog\/?p=11095"},"modified":"2016-10-01T21:56:22","modified_gmt":"2016-10-02T01:56:22","slug":"wireless-communication-between-two-arduinos-using-low-cost-433mhz-ask-rf-modules","status":"publish","type":"post","link":"https:\/\/embedded-lab.com\/blog\/wireless-communication-between-two-arduinos-using-low-cost-433mhz-ask-rf-modules\/","title":{"rendered":"Wireless communication between two Arduinos using inexpensive RF modules"},"content":{"rendered":"

This article explores an easy wireless communication setup between two Arduinos using low-cost ASK RF transmitter and receiver modules that are readily available in the market. They are found in different shapes, but functionally they are all same. Both Tx and Rx modules contain a single data line for input and output and support a low-speed Amplitude Shift Keying modulation for data communication. You can get them with 315MHz or 433MHz carrier frequency. In this tutorial, I am using a 433MHz Tx\/Rx pair<\/a><\/strong> with two Arduino boards to illustrate how to construct a low-range wireless temperature and humidity monitor.<\/p>\n

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Wireless communication between two Arduinos using ASK RF modules<\/p><\/div>\n

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ASK Tx\/Rx modules<\/h5>\n

As I mentioned, you can buy varieties of ASK Tx\/Rx modules from both domestic and international markets (specially China). Some of them come with spring antennas, and some don’t. With the ones without antennas, you can connect ~20cm wire to their antenna pin on circuit board. The figure below shows some of the ASK RF modules you can buy on eBay and Amazon.<\/p>\n

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Different types of ASK tx\/rx modules<\/p><\/div>\n

The Tx\/Rx RF modules\u00a0I am using in this project are manufactured by NiceRF<\/a><\/strong>, a China-based company. You can also buy these modules directly from our Tindie store<\/a><\/strong>.\u00a0The nice things about these modules are they are very compact<\/strong>, breadboard and PCB friendly<\/strong>, made of high-quality PCB<\/strong>, come with copper spring antennas<\/strong> and have a reasonably good coverage area<\/strong>. With the spring antennas installed on both ends, I was able to achieve reliable communication between any two corners within my 2-story, 2000 sq. ft. house. Below is a picture of these Tx\/Rx modules.<\/p>\n

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ASK RF modules from NiceRF<\/p><\/div>\n

Things you will need<\/h5>\n

You will need the following items to build this project.<\/p>\n