diff --git a/circuitpython/code/main.py b/circuitpython/code/main.py
index 9beb7a3..18d0822 100644
--- a/circuitpython/code/main.py
+++ b/circuitpython/code/main.py
@@ -53,6 +53,8 @@ backup_data = True       # Write data as CSV files on onboard SPI Flash ?
 data_to_neopixel = True  # Display atmospheric data as color on onboard neopixel ?
 gps_enable = True        # Use GPS module ?
 update_interval = const(10)   # Interval between data acquisition (in seconds)
+write_interval = const(60)      # Interval between data written on flash Memory
+send_interval = const(60)       # Interval between packet of data sent to Rpi
 datetime_format = "{:04}/{:02}/{:02}_{:02}:{:02}:{:02}"     # Date/time format
 neopixel_max_value =const(70) #max value instead of brightness to spare some mem
 
@@ -329,7 +331,7 @@ check_data_dir()
 data = Data()
 
 #Init timer
-last_update = time.monotonic()
+last_update = last_sent_packet = last_written_data =  time.monotonic()
 while True:
 
     if gps_enable:
@@ -342,14 +344,19 @@ while True:
         data.update()
         if print_data:
             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:
             pixel[0] = data.rgb
 
+    if send_json_data and current - last_sent_packet >= send_interval :
+        last_sent_packet = current
+        rpi_uart.write(data.json + '\n')
+        print(data.json + '\n')
+
+    if backup_data and current - last_written_data >= write_interval :
+        last_written_data = current
+        print("Backup data...")
+        data.write_on_flash()
+    
         gc.collect()
         # micropython.mem_info(1)
         # print('Memory free: {} allocated: {}'.format(gc.mem_free(), gc.mem_alloc()))