I bought a preloaded grbl ATMega328p chip for my arduino. I made sure I put it in the right way so then I hooked it up to the computer. I opened up serial monitor and went through all the baud rates but I keep getting a bunch of little squares. My question is did I do something wrong or what should I do.
Newbie with grbl
From the original Synthetos forum (2011–2025)
What terminal program are you using? I'm not sure this will work with the Arduino serial monitor - I've never tried it. Try using Coolterm (Windows or mac) at 9600 baud. Its available free on the web.
It's not the program I believe to be my problem. It's when I go to configure it and from what I've seen and read in the serial monitor it's supposed to display press $ to configure or something like that. Instead in any baud rate I go to it just produces a bunch of squares. I'm sorry for not being clear enough on that and thank you for the suggestion.
Blizard what serial terminal are you using?
COM 3
Blizard, the serial monitor that comes as part of the Arduino tool set has some 'guilty knowledge' of the Arduino loader and trys to auto detect the speed of the serial link. The preprogrammed chip might not allow the serial monitor to get the speed set correctly. Try downloading 'coolterm' and using that; Setting the communications link to 9600 baud, 8 bits, no parity, one stop bit. If you google coolterm, you'll find several sites from which to download it. There are versions available for Windows and Mac.
Thank you it works now.
i also installed preloaded grbl ATMega328p chip for my arduino but have no respond the rx led lights when sending $ command ('$' ) and nothing happens. using cool term ATM chip is in correctly help
Can you give us your exact settings? Arduino hardware... Coolterm settings etc..
Riley
uno r3 coolterm settings com4 9600 8,none, 1 not sure what else u want to know coolterm is transmitting to uno and rx led blinks but no tx back.
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