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ENG-CANSAT-PICO-MISSION1-CAPTURE (voir la source)
Version du 6 mars 2022 à 18:29
, 6 mars 2022 à 18:29→Main Loop execution
## Send message
## Send message
## Turn of the LED
## Turn of the LED
{{underline|'''Reading sensor data:'''}}}
Reading the BMP280 sensor data relies on the {{fname|bme280.py} library previously detailled.
Reading the temperature from TMP36 relies on analog reading and some conversion calculation.
<syntaxhighlight lang="python"># read BMP280
t,hpa,rh = bmp.raw_values # Temp, press_hPa, humidity
# Read tmp36 (analog)
value = adc.read_u16()
mv = 3300.0 * value / 65535
temp = (mv-500)/10
</syntaxhighlight>
Next the mainloop do prepare the string message (variable {{fname|msg}} by using the powerful Python string formatting feature.
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 lang="python"># message: iteration_count,time_sec,pressure_hpa,tmp36_temp,bmp280_temp (coma separated)
msg = ":%i,%i,%6.2f,%5.2f,%5.2f;" % (counter,time.time()-ctime,hpa,temp,t)
</syntaxhighlight>
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()
== Fault tolerant design ==
== Fault tolerant design ==