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ENG-CANSAT-PICO-MISSION1-RECEIVE (voir la source)
Version du 26 novembre 2022 à 14:23
, 26 novembre 2022 à 14:23→Wiring
== Wiring ==
== Wiring ==
Here how to wire the RFM69 module to the Raspberry-Pi Pico.
[[Fichier:ENG-CANSAT-PICO-RFM69HCW-to-Pico.jpg|640px]]
Here is the description of wiring between the Pico and the RFM69 module.
{| class="wikitable"
|- style="font-weight:bold;"
! RFM69HCW
! PICO
|-
| RST<br />
| GP3
|-
| CS
| GP5 (Slave Select)
|-
| MOSI
| GP7 (Mosi)
|-
| MISO
| GP4 (Miso)
|-
| SCK
| GP6 (Clock)
|-
| GND
| GND
|-
| VIN
| 3V3
|}
== Download the code ==
The code is available for download on the [https://github.com/mchobby/cansat-belgium-micropython GitHub associated to this wiki].
{{download-box|Téléchargez Mission1 Base Station Receiver script (basestation.py)|https://github.com/mchobby/cansat-belgium-micropython/blob/main/mission1/basestation.py}}
== About testing ==
Once the script {{fname|basestation.py}} renamed as {{fname|main.py}} and uploaded to the board, just restart the board to make it running.
{{ambox|text=It also possible to start the script from REPL with the instruction {{fname|import basestation}} }}
The data can be view onto the REPL/Shell session by using Thonny, Putty, MPRemote, cat (under Linux).
You should see the following messages appearing in the REPL.
Notes:
* onboard LED flashing when a data packet is received.
* a point '.' is displayed in the output when receiver get a timeout.
[[Fichier:ENG-CANSAT-PICO-MISSION1-RECEIVER-20.png]]
{{ambox-stop|text=The tmp36 values are not consistent because the sensor wasn't attached to the board!}}
Where we could see the received messages with additional information.
<nowiki>[DATA](len=<data_len>,RSSI=<radio_rssi>)<transmitted_data>
[MSG] <transmitted_message></nowiki>
* Each data received and send over the serial connection are prefixed with '''[DATA]''' .
* The prefix is followed by information enclosed between parenthesis '''()''', this concerns the ''received data''.<br />Entries are key=value pairs separated by coma.
* At the end, we retrieve the transmitted data (under their binary content).
* The binary data are decoded to utf8 strings and prefixed with '''[MSG]''' in the output.
In the informations:
* '''data_len''': length of the binary data stream received.
* '''RSSI''': indicated the [https://en.wikipedia.org/wiki/Received_signal_strength_indication strength of the signal] (-15 at best, -90 at worst).
* '''transmitted_data''': the data as transmitted by the emitter under the binary format.
* '''transmitted_message''': the binary data decoded back to a string. As designed in the emitter, it starts with ''':''' and ends with ''';'''
In the '''transmitted_data''', we can identify:
* The packet counter
* The time counter (seconds)
* The atmospheric pressure (from bmp280)
* The temperature (from tmp36, analog)
* The temperature2 (from bmp280)
== Extra ==
=== Use 'cat' utility ===
If by any changes you do have a '''Linux''' computer, a '''Raspberry-Pi''' or an '''Apple''' computer then you can easily capture the serial data with the {{fname|cat}} command line utility.
Before using {{fname|cat}}, we do need to identifies the computer device attached to the USB-Serial connection.
The {{fname|dmesg}} command line tools inspecting kernel messages can greatly helps to identify the device name.
In the following capture, it is possible to identify the newly plugged USB device as '''ttyACM1''' (so /dev/ttyACM1)
[[Fichier:ENG-CANSAT-PICO-MISSION1-RECEIVE-20.png]]
Now, we can use the following command line to capture the message on de device.
<nowiki>cat /dev/ttyACM1</nowiki>
and viewing the Base Station messages appearing on the screen.
[[Fichier:ENG-CANSAT-PICO-MISSION1-RECEIVE-21.png]]
=== Logging data to file ===
Linux operating system (and alike) allows the user to easily and quickly redirect output (like output of {{fname|cat /dev/ttyACM1}}) to a file.
Key-in the following command:
<nowiki>cat /dev/ttyACM1 > log.txt</nowiki>
will instantly redirect everything coming from {{fname|/dev/ttyACM1}} to the file {{fname|log.txt}} .
Press CTRL+C to stop 'cat' and the redirection. The file 'log.txt' is now fully available for data treatment.
A [https://github.com/mchobby/cansat-belgium-micropython/blob/main/mission1/cansat2.py log.txt sample] is available from the GitHub repository.
{{ENG-CANSAT-PICO-TRAILER}}
{{ENG-CANSAT-PICO-TRAILER}}