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snow
Joined: 28 Jun 2005
Posts: 166
Location: Ashburton / Mid Canterbury / New Zealand
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 Posted: Fri Jul 31, 2015 11:40 am Post subject: Adruino Resetting with incomming serial data |
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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
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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
Joined: 22 Jun 2004
Posts: 921
Location: France
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| Posted: Fri Jul 31, 2015 3:05 pm Post subject: |
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no idea . But it does the same when I use the terminal emulator from the IDE : It does a reset when it is called
jp |
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enniom
Joined: 20 Oct 2009
Posts: 471
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| Posted: Sat Aug 01, 2015 12:03 am Post subject: |
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Is it possible that the PC toggles the DTR / RTS lines and one of them Resets Arduino?
Ennio |
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tronicgr
Joined: 22 Apr 2009
Posts: 17
Location: USA, San Diego
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| Posted: Mon Aug 03, 2015 2:29 pm Post subject: |
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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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Visit my blog about 6DOF controller electronics
http://motionsim.blogspot.com/ |
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bzijlstra
Joined: 30 Dec 2004
Posts: 1179
Location: Tilburg - Netherlands
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| Posted: Mon Aug 03, 2015 5:16 pm Post subject: check weatherstation program in the BLOG section |
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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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