Weather and Security Station with Blynk
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This commented project is an introduction to the different elements provided by Blynk in a real application
Blynk has launched a new version of their service. The version this project relies on is no longer available, except with a local server. The project includes a LaunchPad CC3200, a Grove BoosterPack, and the following Grove modules: a BMP180 barometer and thermometer, a DHT hygrometer and thermometer, a PIR sensor and a relay.
On the Blynk application, I've defined 6 virtual pins and one digital output pin, listed below:
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Prepare the Hardware
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The hardware includes a LaunchPad CC3200 and a Grove BoosterPack with 4 elements:
The Grove system makes connections very easy. Just plug and play! |
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Create a New Project
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Create a new project, select the board as Generic Board and name it.
E-mail the authorisation string and copy-paste it on the project. |
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Add the Displays for Temperature, Pressure and Relative Humidity
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For each element, select it from the list.
A new pane appears. Name the element (here oC). |
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Associate the element to a pin (here V0 for virtual 0), set the minimum and maximum (here 40), set the frequency (here every 10 seconds) and choose the option (here Line).
Finally, press OK to add it to the project. |
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Do the same for the pressure with virtual pin V1.
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On the sketch, the code uses the BLYNK_READ() function.
The function is called by the application on the iPhone, reads the data from the BMP180 sensor, and sends the two values, temperature to virtual 0 and pressure to virtual 1. |
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Add the Alarm LED and the Reset Push Button
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The LED turns red and stays on when the alarm is detected by the PIR sensor.
Select the LED element and associate it to the V4 virtual pin. |
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The PIR sensor is checked every second. If an intrusion is detected, the red LED on the board is turned on and the alarm flag raised accordingly.
The value of the alarm flag is sent to virtual pin 4. |
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The RESET button is a push button and sends a message to virtual pin 5.
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On the sketch, the code uses the BLYNK_WRITE() function.
The function is called by the application on the iPhone and reads the state of the button from virtual 5, then clears the alarm flag if true. |
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Add the A/C Switch
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The A/C button is a switch button associated with digital pin 23. The signal on pin 23 drives the relay. Select blue as colour of the button.
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This application can also run on a local server, for example a BeagleBone. Check out the Private IoT with Blynk on Local Server.
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Download
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