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Ligne 331 :
Ligne 331 : − + Ligne 346 :
Ligne 346 : + + Ligne 352 :
Ligne 354 : − led.on() # Led ON while sending data+ − print( msg )+ − # Send a packet without ACK - Send it, don't care if it is received or not+ − rfm.send(bytes(msg , "utf-8") )+ − led.off()+ + + + + + + +
ENG-CANSAT-PICO-MISSION1-CAPTURE (voir la source)
Version du 6 mars 2022 à 19:57
, 6 mars 2022 à 19:57→Main Loop execution
## Turn of the LED
## Turn of the LED
{{underline|'''Reading sensor data:'''}}}
{{underline|'''Reading sensor data:'''}}
Reading the BMP280 sensor data relies on the {{fname|bme280.py} library previously detailled.
Reading the BMP280 sensor data relies on the {{fname|bme280.py} library previously detailled.
Next the mainloop do prepare the string message (variable {{fname|msg}} by using the powerful Python string formatting feature.
Next the mainloop do prepare the string message (variable {{fname|msg}} by using the powerful Python string formatting feature.
{{underline|'''Formatting data:'''}}
This can be done with one single line. Notice the expression {{fname|time.time()-ctime}} calculating the elapse time (in second) since the mainloop started.
This can be done with one single line. Notice the expression {{fname|time.time()-ctime}} calculating the elapse time (in second) since the mainloop started.
</syntaxhighlight>
</syntaxhighlight>
{{underline|'''Sending data:'''}}
The onboard LED is switched on during data transmission (and print). This makes the LED flashing briefly while data us transmitted.
The data packet are sent without ACK, this would avoids unnecessary latency by waiting for ACK. Indeed, the Cansat will not modifies its behaviours if the data are not received on the ground station.
<syntaxhighlight lang="python">led.on() # Led ON while sending data
print( msg )
# Send a packet without ACK - Send it, don't care if it is received or not
rfm.send(bytes(msg , "utf-8") )
led.off()
</syntaxhighlight>
== Fault tolerant design ==
== Fault tolerant design ==