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Adruino Resetting with incomming serial data

 
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snow

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Joined: 28 Jun 2005
Posts: 212
Location: Ashburton / Mid Canterbury / New Zealand
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PostPosted: Fri Jul 31, 2015 11:40 am    Post subject: Adruino Resetting with incomming serial data Reply with quote
Hi all
I've got a Arduino mega project hooked up to a PC for sensor data logging. The comms is USB to the micro USB port on the arduino. I have got MS Access to send an sensor ID via the usb comms. The Arduino reads this ID and reads the sensor and transmits the data back. Works well

I have noticed something weird. When the ID request is transmitted to the Arduino for the first time only ,the Arduino resets. Then it runs up fully. This is not a big issue I'm just wondering why and should it.

Here is the code snippet that reads the comms

Code:

   Serial_flag = Ischarwaiting()                                                'Listen to the Uart rs232 port for data to turn up

   If Serial_flag = 1 Then                                                      'We got something in the Uart
      Rx_data = 0
      Rx_data = Waitkey()                                                       'Get it

      Filter_command                                                              'Call the sub that fiilters the ID and reads the sensor

      Locate 1 , 1
      Lcd Space(16)
      Locate 1 , 1
      Lcd Rx_data ; ": " ; Sensor_value                                    ' Display it on the LCD before it is sent out. Used for data checking


      Print Sensor_value                                                        'Send the data back to access
      Tx_data = 0
   End If
 




The whole project works well but just trips up for a few cycles at the start

Thoughts??
Cheers Snow
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Duval JP

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Joined: 22 Jun 2004
Posts: 1197
Location: France
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PostPosted: Fri Jul 31, 2015 3:05 pm    Post subject: Reply with quote
no idea . But it does the same when I use the terminal emulator from the IDE : It does a reset when it is called

Rolling Eyes
jp
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enniom

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Joined: 20 Oct 2009
Posts: 548
PostPosted: Sat Aug 01, 2015 12:03 am    Post subject: Reply with quote
Is it possible that the PC toggles the DTR / RTS lines and one of them Resets Arduino?

Ennio
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tronicgr

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Joined: 22 Apr 2009
Posts: 17
Location: USA, San Diego
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PostPosted: Mon Aug 03, 2015 2:29 pm    Post subject: Reply with quote
I had to cut the reset line that was connected on the ftdi chip. Works fine now and if I need to program it again, I manually press the reset button on the arduino as soon I click to program it.


Thanos
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bzijlstra

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Joined: 30 Dec 2004
Posts: 1179
Location: Tilburg - Netherlands
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PostPosted: Mon Aug 03, 2015 5:16 pm    Post subject: check weatherstation program in the BLOG section Reply with quote
Have just published a weatherstation in the BLOG section of this forum. It also makes use of a Arduino and gets serial info from an other device.

Perhaps you can check the code how we did it. We also have spend some time to get the right solution...

Have fun
Ben Zijlstra
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