Bluetooth Relay on the Elektor-Labs Prototype Board ELPB-NG (150180)

I came up with this project because a colleague of mine wanted an easy way to control his three garage ports, so I thought it would be nice to control it with an Android app via Bluetooth.

I came up with this project because a colleague of mine wanted an easy way to control his three garage ports, so I thought it would be nice to control it with an Android app via Bluetooth.

I started by building a prototype on a breadboard. I used an HC-06 Bluetooth module for the connection with an Android device. Because I didn't need that many pins, I used an ATtiny85 to control everything. The Bluetooth module uses two pins on the attiny so I have three pins left as outputs. These three outputs are used to drive relays. Everything is powered with 3.3 V because the bluetooth module only works with 3.3 V.

To control the relays I made an app in Android Studio. With this app you can pulse or toggle the outputs. When pulsing the outputs, the pulse duration can be set from 0.1s to 5s in steps of 0.1s.

Now I'm going to put everything on the Elektor-Labs Prototype Board ELPB-NG.

The project is built on the Elektor-Labs Prototype board. For the relays I used UA2-5NU signal relays.

Because we liked the project, we also made a special PCB for it. This PCB and the programmed controller is available in our Elektor shop.

Project Elements

bluetooth-relay-2.jpg (JPG, 870.94 KB)

img-20151222-095337.jpg (JPG, 903.33 KB)

bluetooth-relay.png (PNG, 12.75 KB)

bluetooth relay.zip (ZIP)

In this zip file is the code for the attiny85 and the code for the android app

Discussie (3 opmerking(en))

Batiste Janvier 9 jaar geleden

Hello raarts, thank you very much for this project.

I wanted to get into the programming of android applications and I can do it easily with this application which will be my base for a home automation application (opening shutters, extinguishing ignition light and electrical outlet etc etc) .

Best regards.

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hoteloskar 9 jaar geleden

Does the phone automatically connect to the HC06 when the car with the phone comes near the garage?

Can you share the Andoid software?

Regards, Hans

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hoteloskar 8 jaar geleden

Meanwhile I have discovered that there is a good reason for using BLE (not only BL600) because BLE will be supported by iOS (iPhone) without joining Apples developer program. This not the case for "normal" Bluetooth.

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hoteloskar 9 jaar geleden

That sounds good. :-) Because my garage opener has an unsecure radio link (433MHz and no roling code), I think I will build your project as soon as possible. Thanks for the atiny85 and the android code. @Clemens There is no need to use a low energy device such as BL600, because in a garage you have enough power. Also the HC06 is much cheaper than the BL600. Regards Hans

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raarts 9 jaar geleden

The phone now automatically connects to the module when you open the app (if bluetooth is enabled). I added the attiny85 code and the android code to the project.

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raarts 9 jaar geleden

The phone doesn't automatically connect. For that you have to open the app and select the device you want to connect with. I'm still working on the android app, so I'll share it when it's done.

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ClemensValens 9 jaar geleden

Why did you choose the HC06 Bluetooth module instead of the BL600?

Regards,
Clemens

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raarts 9 jaar geleden

Because the bl600 uses bluetooth low energy which is supported in android version 4.3 and higher. The phone of my colleague has a lower android version so it doesn't support bluetooth low energy. So with the hc-06, also older devices can control the board.

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