![]() This way, we can use one for debug or otherwise information spew while the other is tied up talking over the WiFi tranceiver. This is only possible because there are at least two hardware serial ports built in. With the onboard WiFi widget tying up one hardware serial port, it's nice to have the main one available as a COM port over the USB connection. While Arduinos can interact with a serial device by emulating a UART in software, they can't get baudrates of 115200 while doing so. Given the relative costs of these boards, I think the Arduino Mega 2560+Wifi and its clones are worth a little extra if for no other reason than having four hardware serial UARTs. Here we go, and good luck! Why this Particular Board? That's the fun side of flashable hardware. Bricking is when you turn a device into a brick, a paperweight, or a doorstop. For those of you that don't know what "bricking" is, I suppose you're lucky. Yes, you can brick them - or at least brick their WiFi tranceiver. After a day or two of fiddling, and stepping on a proverbial landmine, I have got my feet under me and I aim to teach you how to use one of these things without bricking it. these tend to come with no software and no instructions - nothing, not even a datasheet. The dozens of inputs and outputs can be used to control devices or read from sensors, and they give you enough to run something like a robot. The extra hardware serial is nice to use for debugging because it can be logged to, even as you use the other hardware serial for talking to the onboard ESP8266 WiFi tranceiver. Any help for a couple of very inexperienced beginners would be appreciated.The Arduino Mega 2560+WiFi is an Arduino board geared toward robotics, so it provides many inputs and outputs, both analog and digital, and not one, but four! hardware UARTs for doing serial communication. I've found a few solutions in various forums but they either didn't work or were too complicated for us to implement. Neither of us a experienced with code writing so we need something that will require minimal modification to make it work. I've scoured everywhere and can't find a GRBL download that's dedicated to the MEGA2560. After more research, it appears that standard GRBL may not be compatible with GRBL. ![]() ![]() I researched and found the different pin outs for the MEGA and made the adjustments. We can't control the steppers in any fashion. So I decided to go ahead and order the MEGA 2560 in order to advance the plan thinking the more memory would help. There were two things that concerned me, one we had a error on compilation but it still downloaded, and two weeks got a warning get that GRBL use most of the available memory on the UNO. We even downloaded a file to simulate a run. We hooked everything up to the UNO, downloaded IDE, GRBL, G-Code sender, all the current editions. I purchased 3 NEMA 24 stepper motors, and three TB6600 Chinese stepper motor controllers and a power supply. I helped him research and we put a plan together to get the Arduino controlling the steppers motors before we went further. He approached me about building a 3D printer and I told him if he could do that then he should be able to build me a cnc controlled Plasma cutting table for my business. He purchased a genuine Arduino UNO from Amazon. My son and I are very, very new to Arduino and new to microcontroller in general.
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