To prevent the homing cycle from racking the dual axis, when one limit triggers before the other due to switch failure or noise, the homing cycle will automatically abort if the second motor’s limit switch does not trigger within the three distance parameters defined below. Core XY, spindle direction pin, and M7 mist coolant are disabled/not supported. Variable spindle/laser mode IS supported, but only for one config option. Certain configurations can run out of flash to fit on an Arduino 328p/Uno. NOTE: This feature requires approximately 400 bytes of flash. WARNING: Make sure to test the directions of your dual axis motors! They must be setup to move the same direction BEFORE running your first homing cycle or any long motion! Motors moving in opposite directions can cause serious damage to your machine! Use this dual axis feature at your own risk. This is NOT a feature for an independent fourth axis. However to save precious flash and memory, this dual axis feature must share the same settings (step/mm, max speed, acceleration) as the parent motor. The step pulse and direction of the cloned motor can be set independently of the main axis motor. The dual axis feature works by cloning an axis step output onto another pair of step and direction pins. The homing cycle must home the z-axis and cloned axis in different cycles, which is already the default config. Highly recommend keeping the motors always enabled to ensure the gantry stays square with the $1=255 setting.įor Grbl on the Arduino Uno, the cloned axis limit switch must to be shared with and wired with z-axis limit pin due to the lack of available pins. To self square, both limit switches on the cloned axis must be physically positioned to trigger when the gantry is square. This requires an additional limit switch for the cloned motor. This optional dual axis feature is primarily for the homing cycle to locate two sides of a dual-motor gantry independently, i.e. These pins replace the spindle direction and optional coolant mist pins. The independent direction pin is not absolutely necessary but facilitates easy direction inverting with a Grbl $$ setting. Uno Digital 13 = Coolant (replacing spindle direction.)Īfter installing the grbl repository as a library in Arduino, uncomment out the following lines in config.h file in the grbl library folder.ĭual axis feature requires an independent step pulse pin to operate. Uno Analog Pin 4 = A-axis DUAL_STEP (used to be Optional Mist Coolant Output) Uno Analog Pin 3 = A-axis DUAL_DIRECTION (used to be Coolant Enable Output) Enabled by config define)Īnalog 4 = (Optional) Mist Coolant Output (or ALARM_STATE diagnostic light**)ĭigital 8 = Stepper Motors Enable / Disableĭigital 2 = Step Pulse X-Axis Optional dual axis feature You can Downlad Arduino Uno Pinout Schematic Datasheet (PDF) here.Analog 1 = Feed Hold Button* (SAFETY_DOOR is shared with feed hold. The function of Analog Input Pins on the Arduino Uno.USB Communication on the Arduino Uno (TX and RX).The Pinout of the Arduino Uno is important to know as you design programs and circuits to connect with it. In this Arduino tutorial video we do a full overview of the pins of the Arduino Uno. It’s also important to understand the different communication protocols that the board uses.Īrduino Tutorial: Overview of Arduino Pins The important thing to know when you choose a board for your project is its capabilities and limitations. This guide displays most of its capabilities, but there are also more advanced options which we did not go into in this post. The Arduino Uno Microcontroller is one of the most versatile boards on the market today and that’s why we decided to focus on it in this guide.
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