Building the schematic on a breadboard is one thing, hooking it up to the router is another.

First things first.

The schematic on a breadboardIn part 1 I showed the build of the initial schematic with the display working. Please note that the firmware loaded at that time was from the enhanced version. The firmware belonging to the initial version does not show anything on the display unless it’s hooked up to the router and the scripts there are running.

 

So if you’re going to build the schematic on a breadboard you should build the final version of the schematic with the improved firmware.

When you connect the breadboard to the router here are a few things that can (and in my case did) went wrong.

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The Microchip MCP2210 chip is an easy way to go from USB to SPI with one, dedicated, chip. Microchip also features an evaluation kit and breakout module for the MCP2210.

No need to program the chip. Everything you need is already on there.

Considering that this is very likely a pre-programmed dedicated chip I expect to find a 18F14K50 underneath just like the MCP2200 USB to UART conversion chip, see here and here. With the upcoming PCB design where an ISP header will be added this will be easy to verify with a PicKit.

 

In case you want to make your own breakout board and play with the chip please read on.

The schematic is from the Microchip evaluation board. I removed the 3.3V power and ISP header to boil down to the bare minimum board. The schemati now looks like this, note that the chip says MCP2200 in my schematic since there was no Eagle MCP2210 equivalent available. Luckily both are pin compatible so even though it says MCP2200 it will work jut fine for the MCP2210.

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In Part 1 we verified the touch plate being connected and configured right. Now it’s time to get it working.

 

Credits

Without the information in this thread on cnczone.com I wouldn’t be able to do this so credits to cnczone.com and especially to author Spokes who provided a tutorial and bundled the files needed on page 11 of the mentioned thread. Here is a link to zip file with his files and tutorial. While I’m, setting up my CNC with the touch plate I provide this step by step overview. I’m using LinuxCnc 2.5.0 2.5.1. 2.5.3

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