Add info about pins usage and some tweak to try to debug 2d UART (to raspberry pi)

circuitpython/code/main.py

@@ -22,6 +22,19 @@ Use with:
  * Adafruit Ultimate GPS FeatherWing
  * Bosch BME280 sensor (air temperature, humidity, atmospheric pressure) on I2C
 
+Pins used:
+ * TX/RX : Ultimate GPS FeatherWing (data)
+ * A5 : Ultimate GPS FeatherWing EN (enabe/disable GPS power)
+ * I2C SDA/SCL : BME280 sensor
+ * D5 : RW / RO jumper
+ * D10, D11 : UART TX & RX to Raspberry pi (115200 baudrate)
+ * D9 : to EN pin on Raspberry Lipo SHIM
+ * D13 : onboard LED (as RW/RO indicator)
+
+Back pins diagramm:
+    D05 D10 D11 D09 NC_
+    GND GND SCL SDA 3V3
+
 Git repository :
 https://framagit.org/arofarn/Cameteo
 
@@ -293,7 +306,7 @@ if gps_enable:
 # Second UART to communicate with raspberry pi (throught GPIO)
 if send_json_data:
     rpi_uart = UART(board.D10, board.D11,
-                    baudrate=115200, timeout=2000)
+                    baudrate=9600, timeout=2000, parity=None)
 
 # Set onboard Neopixel : used as atmo data output
 #  brightness is fixed to 1 to spare some memory. Use neopixel_max_value instead
@@ -331,6 +344,7 @@ while True:
             data.show()
         if send_json_data:
             rpi_uart.write(data.json + '\n')
+            print(data.json + '\n')
         if backup_data:
             data.write_on_flash()
         if data_to_neopixel: