![]() ![]() As I've ruled out every other possibility, the cause must be the hardware. I receive an 'avrdude: stk500v2_ReceiveMessage(): timeout'. The error occurs when trying to upload a sketch. I am able to flash both chips with a USBasp programmer via the ICSP pins at each respective chip and have the board recognized as an Arduino Mega 2560 in the Arduino IDE by both my Mac and my PC. I understand how serial communication is conducted between the ATmega 16U2 and the ATmega 2560 chips. There are parts that are not recognized by JLCPCB's import tool, JLCPCB does not carry the part needed, or the limit of extended parts is exceeded when trying to order an SMT assembly (which I need). I know that the BOM is included with the Eagle files - the issue is that you cannot copy and paste that BOM into JLCPCB (at least not in a clean way that I'm aware of). I used the official Arduino Mega 2560 R3 eagle files to create the board. In case you are facing problem while sending data through TX RX of the Arduino from an external Device which has for example a USB port, then a USB to Serial converter is needed in this case, the Arduino Mega has a ATmega16U2 which is a 8bit AVR MCU that has a firmware uploaded to it to play the role of USB to serial converter. Talking about the communication over serial port, if you are establishing this communication from any other external MCU straight to your Arduino MCU then just connect the TX of your Arduino to RX of the external MCU and RX of your Arduino to the TX of the external MCU and it should necessarily have both GND of both parts connected together (common ground) then make sure that you are having the same baud rate of the serial ports set in both MCUs (like 9600 bps). Also, please note that you will need to power cycle the Qik whenever you change the BAUD jumper settings.First of all, please change the post topic to "general discussion" in order to get more interaction with your post since this is not 100% JLCPCB related post.Ībout your request, you better search for the Arduino mega schematic instead of searching of the needed parts because you will have the BOM from the appropriate schematic, please check this public project that it shows what are the components that the mega has been built around : () That code should work with the connections you described, and it should work with either no baud rate jumpers or only the BAUD1 jumper installed. For example, could you try the following code, which should ramp the motor up to full speed, then continue running it at full speed indefinitely? #include I recommend keeping it as simple as possible and removing stuff like the current reading until you get it working. ![]() So, it should also be used instead of begin(). The argument of that function should be the baud rate you want to use (not some arbitrary byte you want to send). It looks like you are using the init() function incorrectly in your setup(). Serial.println(qik.getM0CurrentMilliamps()) send the "Exit Safe Start" command to the motor driver initialize the PololuQik object with the desired baud rate 18 = TX1 of the Arduino Mega to RX of DriverĪttached is the code I am using. ![]() 19 = RX1 of the Arduino Mega to TX of Driver The connections were as follows //Gnd to Gnd I have jumped Baud 1, which was according to the table given in the manual that it will set up baud rate to 115200 bps. I have removed the Demo mode jumper but the serial communication is still not going through. I am trying to exit demo mode but it is not responding. I am working with motor (M0) and trying to ramp the motor from 0 to 127in 7-bit. I have modified and still running the motor in both directions and have learned that serial communications will be ignored during Demo mode? Is it right? ![]() I have managed to solve the Demo mode from your response. ![]()
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