Tag Archives: tinyBrd

Wireless temperature sensor programmed with Arduino IDE

tinyBrd is small development board, with ATtiny84 and NRF24L01+ connector. With software provided by us, You get easy to use board which can send data by radio to Raspberry Pi or Arduino UNO and run many days (our most recent tests show it will run at least 2-3 weeks in this scenario) on single CR2032 battery.

When in sleep mode whole board with NRF24L01 and DS18B20 takes as low as 5 µA!

Tools and materials

To build this example You will need:

Of course You will need tools like solder iron, wire cutter, etc.

To receive data we suggest use Raspberry Pi and our NRF-Hat – simple board to connect NRF24L01+ directly to RPi, without mess (no cables required).

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What new we have learned about NRF24L01

Nettigo tinyBrd i Raspberry Pi z NRF-Hat

Nettigo tinyBrd with RPi and NRF-Hat

In recent weeks we did a lot tests to our tinyBrd. This was due to new Nettigo tinyBrd Core (integration with Arduino IDE). With v1.1b release we have lowered current consumption even more.

Now, in sleep mode tinyBrd with NRF24L01+ and DS18B20 takes only 4-5 µA (vs 9-10 µA on previous software). During sending data it takes 15 mA (vs 18 mA before).

Our test case is sending data (temperature) read from DS18B20 to RPi every 30 seconds and tinyBrd is powered by singe coin battery (CR2032). How does it work?

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Using tinyBrd library on Arduino to connect via NRF24L01

Our tinyBrd has very simple and easy to use interface for NRF24L01 radio. This library was bundled with Nettigo tinyBrd Core, add-on for Arduino IDE to program tinyBrd. Now we have extracted it as standalone and can be used on Arduino UNO and other boards.

Changes are minor, since we need to remove name conflict with bundled Radio library. Arduino IDE library manager was taking our Radio library as library for FM chips. So let us introduce RadioNRF24 library. With library name change we have changed main object name so all old examples are valid, just use new object name:

  RadioNRF24.begin(address, 100);

There is no other changes. With UNO You have use different begin form:

  RadioNRF24.begin(address, 100, 8, 7);

On tinyBrd CSN i CE are fixed so there is no need to give them in initalizer. That is not true with UNO, so in former example 8 is CSN pin and 7 i CE pin. Exactly as it is shown on following diagram – how to connect NRF24L01 to Arduino.

Connecting nRF24L01 and Arduino

Connecting nRF24L01 and Arduino

Library is for now available only on GitHub: https://github.com/nettigo/RadioNRF24

We will prepare more easy to use form as .zip file. Also – there are some examples as  gists: https://gist.github.com/netmaniac/dfd7eb4f884d58346480. Remember – as for today library bundled in tinyBd Core is still using  Radio name, so all code on tinyBrd should use Radio.begin and similar. On UNO use RadioNRF24. In future, we will update tinyBrd Core to use RadioNRF24 name.