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ENG-CANSAT-PICO-MISSION1-CAPTURE (voir la source)
Version du 6 mars 2022 à 15:41
, 6 mars 2022 à 15:41→Structuring the data
As the {{fname|rfm.send()}} only acept {{fname|bytes}}/binary data, the {{fname|msg}} is transformed into an array of bytes with {{fname|bytes()}} . {{fname|bytes()}} array can only contains ASCII bytes < 127, any other character/byte must be appropriately encoded! This is why the call to {{fname|bytes(msg , "utf-8")}} mentions the source string encoding (which is [https://fr.wikipedia.org/wiki/UTF-8 UTF-8] nowadays).
As the {{fname|rfm.send()}} only acept {{fname|bytes}}/binary data, the {{fname|msg}} is transformed into an array of bytes with {{fname|bytes()}} . {{fname|bytes()}} array can only contains ASCII bytes < 127, any other character/byte must be appropriately encoded! This is why the call to {{fname|bytes(msg , "utf-8")}} mentions the source string encoding (which is [https://fr.wikipedia.org/wiki/UTF-8 UTF-8] nowadays).
== LEDs and Error management ==
Being able to understand rapidly what's happening inside your object is essential to rapidly fix the issue.
The best is to figure out what's happening is to use LED, blink status, heartbeat.
By doing so, no need to attach an USB cable and opens a terminal over the USB-Serial to figure out the status of the object.
[[Fichier:ENG-CANSAT-PICO-MISSION1-CAPTURE-25.png|360px]]
The {{fname|cansat2.py}} script do re-enforce error controls with {{fname|try...except}} statements in the script and showing various onboard LED patterns in case of error.
{| class="wikitable" border="1"
|-
| align="center" | LED operation
| align="center" | Description
| align="center" | Fix the issue
|- style="font-size: 90%"
| align="left" | NeoPixel GREEN
| align="left" | The {{fname|setup()}} function did not complete initialization because of a crash.
| align="left" | Check the wiring of sensors. Test each sensor separately (with their tests code). If this not working, remove all sensors except the one you are testing.
|- style="font-size: 90%"
| align="left" | NeoPixel OFF
| align="left" | The {{fname|setup()}} did complete successfully. The main {{fname|loop()}} is not running.
| align="left" | ''Nothing to do here, just check the RADIO_LED for more informations''.
|- style="font-size: 90%"
| align="left" | RADIO LED = 1 pulse 50ms
| align="left" | The LED is pulsed for each successfully send message + getting ACK from the receiver. The code wait 500ms max for the ACK.
| align="left" | ''Nothing to do here''.
|- style="font-size: 90%"
| align="left" | RADIO LED = 2 pulse 50ms + pause 100ms
| align="left" | Message send but error while decoding the ACK response.
| align="left" | ''This is not critical, the most important is that the message was sent successfully''.
|- style="font-size: 90%"
| align="left" | RADIO LED = 3 pulse 50ms + pause 150ms
| align="left" | Not ACK message received within the 500ms after message was sent.<br />This can be interpreted as "Is there someone listening the message?" because there are not reply.
| align="left" | ''This is not critical, the most important is that the message was sent successfully''.
|}
{{ENG-CANSAT-PICO-TRAILER}}
{{ENG-CANSAT-PICO-TRAILER}}