alden

The ‘J’ reference designator refers to all connectors, not just jumpers. Many connectors are labeled in the schematics, e.g. J14 is TTL serial, J9 is USB, etc. Some are not. Here’s what they are:

J1 – Vmot input (main power input)
J2, J3, J4, J5 – motor connectors
J6 – digital outputs
J17, J18, J19, J20 – stepper signal breakout connectors
J11 – fan connector
J12 – 12v/24v fan voltage selection

I don’t think it’s the firmware. It might be good to update to the latest edge and try again just to rule that out. But 380.xx has been running those commands for a long time and this is the first we’ve heard of this issue.

Cycling M3, M4, M5 should switch the spindle direction bit on and off. Cycling M7, Mp should turn the coolant on and off. You can also see if the processor pin is turning on. THe schematics are on the github.

Thanks for the detailed explanation. See also this section on the wiki:
https://github.com/synthetos/TinyG/wiki/TinyG-Configuration-for-Firmware-Version-0.97#motor-settings

The step angle is a motor parameter, typically 1.8 degrees for most motors. It’s an independent variable. It just describes your motor.

The microsteps is also an independent variable. Set to 1, 2, 4 or 8.

For screw axes the travel for revolution is the pitch of the screw, e.g. 1.25mm thread pitch is = 1.25mm per revolution.

For belt machines the travel per revolution is approximately the circumference of the cog wheel. Which is somewhat less precise way of saying the number of teeth on the pulley * distance of teeth on the belt as chmr said.

Once you get the tr set you can dial it in with calipers and some measurement.

Alternately you can use the Spindle PWM signal to drive a hobby servo. It’s a 3.3v signal so some external level shifting and/or buffering may be required.

https://github.com/synthetos/TinyG/wiki/TinyG-Configuration-for-Firmware-Version-0.97#pwm-group-pulse-width-modulation

The board as it stands is pretty independent of power sequencing. It connects pretty much regardless of the order you power up and/or plug in USB.

You could play with powering the FTDI independently, but I still think there would be problems with power sequencing. I suspect the FTDI serial flow control may be getting messed up. I’m not sure what’s going on in the Windows terminal program – we’ve never had any problems with Coolterm.

I’m afraid the terms “serial” and “USB” are being used loosely here. tgfx talks to the TinyG USB port, aka the serial port. I’d recommend reading this page and trying it first with Coolterm. https://github.com/synthetos/TinyG/wiki/Connecting-TinyG

Once that’s working move on to tgfx.

The TTL serial is a 3.3v serial line that can be connected to Arduinos and such, bypassing the USB port. The TTL serial port does not connect to the Computer’s RS-232 serial outputs.

• This reply was modified 10 years, 4 months ago by alden.

Avrdude is buried in the latest Arduino package, version 1.5.7. Unzip the app and right click to show package contents (these are OSX instructions, other platforms may be different). You can find Avrdude in Contents/Resources/Java/hardware/tools/avr/bin/avrdude

I’ll update the wiki docs.