Setting up a BMP180 with the ClusterDuck Protocol | by Taraqur Rahman | Project OWL | Apr, 2021 – Medium


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The BMP180

The BMP180 has four pin holes: VIN, GND, SDA, SLA. The VIN is the input voltage. This is where the power source goes into. GND is the ground. SDA stands for Serial DAta and SCL stands for Serial CLock. These are special pins used to transfer data. We can solder these BMP180s to both the Heltec ESP32 and TTGO T-Beams.

Soldering to the Heltec ESP32

The ESP32 board has many pins but only two of them correspond to the SDA and SCL. So we have to make sure we solder in the right places.

Uploading the Firmware

The next step is to upload the firmware from the ClusterDuck Protocol. (If you haven’t cloned the repo, check out our wiki on how to do that. [LINK]) We can get the BMP180 example by opening Arduino then File -> Examples -> ClusterDuck -> examples -> 3. Sensor-Examples -> BMP180Example.

That should open up the BMP180 example. Two things I like to change for preferences is the name of the Duck and the frequency we send the data. To change the name of the Duck, we go to line 37:

std::string deviceId(“MAMA0001”);

Replace MAMA0001 with a name of preference. The name has to be 8 characters long and inside quotes.

To change the frequency we send the data, we have to go to line 30:

const int INTERVAL_MS = 60000;

And replace the 60000 value with another value of preference. This value is in milliseconds, so right now it is sending data every 60 seconds. If we only need to take measurements every hour, we have to convert 1 hour into milliseconds (1 hr = 3600000 milliseconds).

Collecting the Data

There are two ways to get the data. One way is to register for the Duck Management System (DMS) or if you would like a local solution, you can make a DMS-lite.

So now we finished the set-up, we can deploy the Ducks and watch the data flow!

User Case

I have already deployed three Ducks named Gotham00, Central0, Mtrpolis, with BMP180s around my house. Each duck sent temperature and pressure reading every 30 minutes and I collected the data for about a week. These are the some data graphs I have created:

Temperature Data for three of the Ducks deployed

Temperature Data for three of the Ducks deployed

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