Data lost writing on Arduino serial port. Your loop could easily run faster than 100 times/sec and if so the serial output buffer is undoubtedly overflowing. How to flush the input serial buffer in Arduino? Using the input GET /101011 HTTP/1.1 r n the output produced. The rest of data from the serial input buffer? Arduino Serial OutputIf you're using SoftwareSerial, I think you have no chance of detecting serial overflow, because the docs say you can't use Serial.available. But even if you were using the hardware serial library, I don't think you can detect if bytes are getting dropped. The closest thing you could do is use Serial.available to see when you're about to overrun the buffer. ![]() But this is really what hardware and XON/XOFF flow control are for. When the serial driver supports this functionality, you can prevent buffer overflows because the host will tell the client when no more data can be accepted over the serial line, and vice versa. I don't think Arduino supports any kind of flow control, especially since begin() only takes a serial port speed as a parameter. They are powered off the same 12V 2A regulated supply, going into the Arduino, then I pull the 5V/GND into the GSM module. I think I have figured it out though. I did some reading and it looks like SoftwareSerial is unreliable for bauds above 19200, so I tried swapping the serial line to be SoftwareSerial and for the Arduino to communicate with the GSM module over the hardware serial (Serial). No more garbage. Now I'm just getting garbage back from the modem, such as: GPRS Message: [ +G: 003] – Jul 27 '13 at 4:54 •. SoftwareSerial is notoriously picky about timing and will cause problems like you describe when 'too much' is going on at the same time. It probably gets out of sync because of you are doing other stuff on the side. Midtown madness game for pc free download. I warmly recommend AltSoftSerial (), which performs much better, but I still suggest you use slightly lower baud rates to increase reliability. Too high baud rates will require very exact timing to not miss a single bit and the hardware is not powerful enough to do serial traffic in software without problems.
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