ManganLabs > Projects > Arduino Unplugged – Wireless Sensors

Arduino Unplugged – Wireless Sensors

This weekend I started playing around with the nRF24L01 RF modules.  These things are a fantastic low-cost option for creating wireless communications between two Arduino micro-controllers.

nRF24L01+ 2.4GHz Wireless Modules

nRF24L01+ 2.4GHz Wireless Modules

These are multi-node modules where many modules can transmit back to the same “master” node.  You can also find long distance versions of the same module online that claim to achieve 800-1K meters (2624 – 3280 ft)  in distance!

This example shows a simple LED being controlled wirelessly.  You can get about 300ft of distance between the two devices. Possibly more in clear view.  I was able to walk around my entire house and still trigger the LED remotely. The options are endless for what you could do with this when it comes to wireless sensors and remote monitoring.

My next step – Shrink the transmitting side down to a ATTiny85 version of the Arduino, bringing the cost of each transmitter down to about $5.

attiny85

ATTiny85 – At about $1 each, these are perfect for dedicating to a project in place of an Arduino

Stay tuned for more details and an update on the project as it gets closer to completion.

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  • Mitchell P

    Someone’s already got the nrf24l01 controllers working with the ATTiny85. I’ve been looking to setting a heap of these up as sensors in a mesh network with a master node. My biggest issue is going to be the battery life on them.

    http://nerdralph.blogspot.ca/2014/01/nrf24l01-control-with-3-attiny85-pins.html

    • manganlabs

      Thanks! I had found that site as well and that is exactly the method I plan to use. Appreciate the feedback. I’m curious on battery life as well. I may build a battery monitor into mine with simple buzzer so they “chirp” when the battery voltage drops below a specific level.

      • Mitchell P

        That’s a really good idea. I was planning on making mine send both data on the sensor (a switch) and battery information when it sent data over the air.

  • http://dan-russell.com danruss

    Sweet!

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