32 908
modifications
Modifications
Sauter à la navigation
Sauter à la recherche
Ligne 244 :
Ligne 244 : + + + + + + + + + + + + + + + + + + − First, the script will includes all the needed libraries.+ + + + + + + + + + + + + + + + + + + + +
ENG-CANSAT-PICO-MISSION1-CAPTURE (voir la source)
Version du 6 mars 2022 à 17:44
, 6 mars 2022 à 17:44→The code explained
* Send it over the USB-serial connection
* Send it over the USB-serial connection
* Send it over the radio link
* Send it over the radio link
First, the script will includes all the needed libraries.
<syntaxhighlight lang="python">
from machine import SPI, I2C, Pin, ADC
from rfm69 import RFM69
from bme280 import BME280, BMP280_I2CADDR
import time
</syntaxhighlight>
This section is immediately followed by the various CONSTANT declaration.
<syntaxhighlight lang="python">
FREQ = 433.1
ENCRYPTION_KEY = b"\x01\x02\x03\x04\x05\x06\x07\x08\x01\x02\x03\x04\x05\x06\x07\x08"
NODE_ID = 120 # ID of this node
BASESTATION_ID = 100 # ID of the node (base station) to be contacted
</syntaxhighlight>
{{dbox-orange|Don't forget to update the radio frequency '''FREQ''' and the '''ENCRYPTION_KEY''' encryption key. }}
{{dbox-orange|Don't forget to update the radio frequency '''FREQ''' and the '''ENCRYPTION_KEY''' encryption key. }}
Then we create the needed buses resources to access the various sensor.
<syntaxhighlight lang="python">
spi = SPI(0, baudrate=50000, polarity=0, phase=0, firstbit=SPI.MSB)
nss = Pin( 5, Pin.OUT, value=True )
rst = Pin( 3, Pin.OUT, value=False )
i2c = I2C(0)
</syntaxhighlight>
Next we create the RFM69 radio object (named {{fname|rfm}}) and the BMP280 radio object (named {{fname|bmp}}).
<syntaxhighlight lang="python">
# RFM Module
rfm = RFM69( spi=spi, nss=nss, reset=rst )
rfm.frequency_mhz = FREQ
rfm.encryption_key = ( ENCRYPTION_KEY )
rfm.node = NODE_ID # This instance is the node 120
rfm.destination = BASESTATION_ID # Send to specific node 100
# BMP280 (uses the BME280)
bmp = BME280( i2c=i2c, address=BMP280_I2CADDR )
</syntaxhighlight>
== Fault tolerant design ==
== Fault tolerant design ==