Hi everyone.
I got an Arduino UNO, which i have installed the driver correctly and he works perfectly, I upload the code and no error is shown.I have as well an EasyVR arduino shield, which I connect to the arduino UNO them to the PC (J12 is on PC). I run the Easy Commander programm and it connects to the shield without a problem. I recorded all the commands and generate the code with it. My problem is when I try to upload the code to the EasyVR(which is connected to the arduino obviously) I get the following message:
avrdude stk500_getsync(): not in sync resp=0x00
and it appears only when the shield is connected to the arduino.
can someone help me on this one?, I will be very greatful.
This is a problem with some shields which use Rx, Tx pins (0,1). These pins are used for USB/serial Arduino communication. If there is connected another device the USB/serial circuit is malfunctioned due to impedance mismatch. The solution is to disconnect the shield before each upload.
In my designs in such cases I am using electronic switch driven by RTS signal since this signal is unused in newer boards. It was used for auto reset same as DTR. Unfortunately RTS is not pinned out. I had have modify avrdude to keep the RTS low during the upload and also I have my own board with the RTS and DTR pinned out. Here is some info about my Arduino variant: forum.arduino.cc/index.php?topic=277260.0