sensehat

Raspberry Python SenseHat code Just some simple programs to play around with Raspberry Pi SenseHat Board.

'kaleidoscope.py'

Just draws pretty symmetrical patterns.

'smallhex.py'

Defines small (3x5) pixel characters to display two digit number on the SenseHat LEDs; to avoid scrolling text.

Hex + Decimal digits defined.

'sensor_client.py'

Publishes SenseHat data (temperature, humidity, pressure) to an 'mqtt' broker. Allows other clients (by sending a '?' (question-mark) to the appropriate topic) to recieve the information from the SenseHat.

Other devices can then be used to request and display the information from the SenseHat.

See: https://pypi.python.org/pypi/paho-mqtt for required library.

Needs an 'mqtt' broker: you can install 'mosquitto' on the Pi with:

sudo apt-get install mosquitto

Note: the broker and the client can be run on different machines or the same machine.

Screenshot: showing an iOS client (https://itunes.apple.com/us/app/zmqtt-utility/id737370079?mt=8) sending out MQTT messages and displaying the output.

The UI is very responsive , (probably) due to the lightweight nature of MQTT.

'mqtt_lights.py'

Simple subscriber (does not publish anything itself) that listens for messages and switches SenseHat LEDs on/off.

'log_sensors_to_csv.py'

Writes date+sensor data to a 'CSV' file in a loop. Loop will run for a fixed number of readings, pausing for a fixed number of secondsbetween readings.

'ledpaint.py'

A 'painting' tool - runs a GUI (Tkinter) that lets you 'paint' in realtime onto the SenseHat LED matrix.

Here's a screenshot showing a rudimentary representation of a smiling human face. And then a photo showing the result of the SenseHat itself

New ! Multi-coloured support - simply press SPACE to cycle through 7 fantastic colours ! Also: you can hold down the mouse button to paint - as well as clicking individual pixels !

'morse_sense.py'

Just blinks morse code on the SenseHat. For a small novelty you can blink the actual letters on the sense hat ('flash_letter'=True on the constructor). Additionally: it is the only program I have written where I have had to pleasure of being able to name a method 'do_dah' and for the name to be meaningful ! :-)

I don't speak Morse, so I can't say whether the output it is actually discernable to anybody - although "SOS" looked about right ! Gets the definitions from a text file (default 'morse.txt', included)