From the original Synthetos forum (2011–2025)
On a board diagram of tinyG there are contacts (3.3v, gnd, rx, tx). Whether there is an opportunity to connect arduino via the serial interface to tinyG that it was possible to operate tinyg?
I design the independent milling machine without use of the computer which will carry out the same gcode. I want that arduino could give a signal on start of the program and a stop.
Yes, what you want to do has been done by many, but not me so details would be third hand.
If useful, I suggest you review tinyG schematics here:
and the go to this Forum at level:
and use the search capability , searching on Serial or...
Remember, tinyG is 3.3V logic, so direct wiring to UNO may not be appropriate (5V logic), but DUE probably OK (3.3V logic).
As you will see in the schematics, the Tx Rx you see result in a "wired OR" with the ftdi output and those terminals.
You can (carefully) use both channels simultaneously in parallel (a debugging hint)
The RX and TX lines on the v7 and v8 are set up to be 5v tolerant specifically so you can connect one up to an Arduino.
Realize that you cannot use the USB and the RX/TX connection at the same time, but you may be able to "snoop" on the RX/TX with the USB. But it's probably best to unplug the USB.
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