## Sense HAT prakticky
#### najpopulárnejšie rozšírenie pre Raspberry Pi
[Miroslav "mirek" Biňas](https://bletvaska.github.io)
/ [**Namakaný webinár**](http://www.namakanyden.sk)
## Čo je to Sense HAT?
## HAT
(Hardware Attached on Top)
Notes:
* https://radu-matei.com/blog/rpi-sensehat-telemetry/
* https://projects.raspberrypi.org/en/projects/getting-started-with-the-sense-hat/2
Sense HAT je rozširujúca doska pre Raspberry Pi vytvorená špeciálne pre súťaž [Astro Pi](https://astro-pi.org).
## Komponenty Sense HAT-u
* senzory: teplotný, vlhkosti, tlakový
* IMU (Inertial Measurement Unit)
* gyroskop
* akcelerometer
* magnetometer
* joystick
* 8x8 RGB LED matrix
notes:
* A gyroscope (for detecting which way up the board is)
* An accelerometer (for detecting movement)
* A magnetometer (for detecting magnetic fields)
## Koľko Sense HAT stojí?
* [RPishop.cz](https://rpishop.cz/hat/126-raspberry-pi-sense-hat.html?SubmitCurrency=1&id_currency=2) - 37,89 €
* [RLX.sk](https://rlx.sk/sk/raspberry-pi/4546-raspberrypi-sensehat-2483095-orientation-pressure-humidity-temperature-sensors-.html) - 35,28 €
## (Ani) Sense HAT nemám :-(
* Desktop Sense HAT emulátor
* Online Sense HAT emulátor
## [Sense HAT Emulator](https://sense-emu.readthedocs.io/)
* dá sa nainštalovať aj na ["bežný" OS](https://sense-emu.readthedocs.io/en/v1.1/install.html)
## [Code the Sense HAT in Your Browser!](https://trinket.io/sense-hat)
New from Trinket and the Raspberry Pi Foundation: Explore Your World with Sensors and Python
## Sense HAT prakticky
* Hello world!
* senzory teploty, vlhkosti a tlaku
* kompas
## Hello world!
```python
from sense_hat import SenseHat
# from sense_emu import SenseHat
sense = SenseHat()
sense.show_message('Hello world!')
```
## Nastavenie jedného pixla
```python
from sense_hat import SenseHat
sense = SenseHat()
sense.set_pixel(2, 2, (0, 0, 255))
sense.set_pixel(4, 2, (0, 0, 255))
sense.set_pixel(3, 4, (100, 0, 0))
sense.set_pixel(1, 5, (255, 0, 0))
sense.set_pixel(2, 6, (255, 0, 0))
sense.set_pixel(3, 6, (255, 0, 0))
sense.set_pixel(4, 6, (255, 0, 0))
sense.set_pixel(5, 5, (255, 0, 0))
```
## Snímanie prostredia
```python
from time import sleep
from sense_emu import SenseHat
sense = SenseHat()
sense.clear()
while True:
pressure = sense.get_pressure()
temp = sense.get_temperature()
humidity = sense.get_humidity()
print(f"{temp:.2f}°C {humidity:.2f}% {pressure:.2f}hPa")
sleep(1)
```
## Pitch, Roll and Yaw
```python
from sense_emu import SenseHat
sense = SenseHat()
sense.clear()
o = sense.get_orientation()
pitch = o["pitch"]
roll = o["roll"]
yaw = o["yaw"]
print(f"pitch {pitch} roll {roll} yaw {yaw}")
```
notes:
* azimut? elevace? náklon?
## Zrýchlenie
```python
from sense_hat import SenseHat
sense = SenseHat()
red = (255, 0, 0)
while True:
acceleration = sense.get_accelerometer_raw()
x = acceleration['x']
y = acceleration['y']
z = acceleration['z']
x = abs(x)
y = abs(y)
z = abs(z)
if x > 1 or y > 1 or z > 1:
sense.show_letter("!", red)
else:
sense.clear()
```
## Použitie veselej paličky
```python
from sense_hat import SenseHat
def pushed_up(event):
print(event)
sense = SenseHat()
sense.stick.direction_up = pushed_up
while True:
for event in sense.stick.get_events():
print(event.direction, event.action)
```
## Sense HAT ako kompas
```python
from sense_hat import SenseHat
sense = SenseHat()
while True:
heading = sense.get_compass()
if heading < 45 or heading > 315:
sense.show_letter('N')
elif heading < 135:
sense.show_letter('N')
elif heading < 225:
sense.show_letter('S')
else:
sense.show_letter('W')
```
## Sense HAT a Node-RED
* [node-red-node-pi-sense-hat](https://flows.nodered.org/node/node-red-node-pi-sense-hat)
* [node-red-node-pi-sense-hat-simulator](https://flows.nodered.org/node/node-red-node-pi-sense-hat-simulator)
* [node-red-contrib-sense-hat-scroll-message](https://flows.nodered.org/node/node-red-contrib-sense-hat-scroll-message)
## Zdroje
* [Sense HAT](https://pythonhosted.org/sense-hat/) - modul pre jazyk Python na ovládanie Sense HAT-u
* [Sense HAT Emulator](https://sense-emu.readthedocs.io/) - softvérový emulátor pre Sense HAT
* [Code the Sense HAT in Your Browser!](https://trinket.io/sense-hat)
* [Raspberry Pi Projekty](https://projects.raspberrypi.org/en/projects?hardware%5B%5D=sense-hat) - projekty pre Sense HAT
* [Getting started with the Sense HAT](https://projects.raspberrypi.org/en/projects/getting-started-with-the-sense-hat)
(**https://bit.ly/3gxVern**)