Elecrow Arduino CNC Shield V3.51 - GRBL v0.9 Compatible
Description
- Elecrow Arduino CNC Shield V3.51
- Includes Noise Filters on all endstops and the probing pin
- Is compatible with GRBL 0.9 and offers 4-Axis support
- Has 2 x End stops for each axis
- Uses removable Pololu A4988 compatible stepper drivers
The Elecrow Arduino CNC Shield V3.51 - GRBL v0.9 Compatible is a simple Arduino CNC shield kit (Arduino Extension Board) with the following features: New with Version 3.51 Added circuitry for End-Stop and Probe signal filtering. This eliminates false triggers and makes it possible to use non-shielded cable for end-stops/probes.

Bigger Solder pads make it easier to assemble. Probe pin labels have been updated to make it easier to install a probe.
- 1 x Elecrow Arduino CNC Shield V3.51 - GRBL v0.9 compatible - Uses Pololu Drivers
- Initial Weight: 33g
This is a high quality product and it works well. However I am not using it for its intended CNC application but simply as a physical platform for three stepper drivers plus I2C. The steppers ran fine but the I2C would not. The snag I found was that the SCL line has a pull-up to Vdd and this prevents the I2C from working. it was not a good idea to lift the resistor so I simply isolated the SCL line and connected directly to the UNO. There is no diagram that I can find that reflects the wiring of this version with its pull-up resistors for example and so it required probing with a DVM to uncover the problem. I realize I am using it outside its intended application but nevertheless there should be a correct schematic available for troubleshooting.
The pwm and probe ports are well worth the upgrade from the v3 board.
Worth buying this original over the problematic Asian clones. V3.51 has enough improvements to make it worthwhile upgrading over the previous versions. Great way to squeeze out every bit of GRBL capability in an easy-to-use package. I too would like to see schematics published, but understand the manufacturer's reluctance.
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