Introduction
This post details the validation of the remaining hardware item on the drill press controller and Printed Circuit Board (PCB) updates.
Debug Validation
A series resistor was fitted between the microcontroller (PSoC) and the debug (TTL RX, TX) connector to serve as a basic type of input protection. During testing, the serial communications (USB to TTL converter) were intermittent, so the series 100 R resistor was reduced to 10 R to ensure reliable operation.
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| Updated Serial Input Resistors |
PCB Update
As noted in the previous blog, the footprint of the input device (MAX22191) on the PCB required updating.
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| Updated Footprints on ESTOP PCB |
During the PCB update, the top-layer silk screen text near the input and output connectors was increased to 1.5 mm.
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| Updated Text at Inputs on PCB |
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| Updated Text at Outputs on PCB |
To allow for easier hand soldering, a selection of component pads was increased.
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| ESTOP Mains Input Capacitor Pad Sizes |
Updates were made to the power supply (AC-DC) and mains input capacitors.
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| ESTOP Mains Input Capacitor Pad Sizes Updated |
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The image below shows the updated board.
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ESTOP PCB Update |
Next, building the updated PCB, reviewing the mounting of the solid-state relay in the original enclosure shown below, and testing with the existing drill press setup.
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| Existing ESTOP Electrical on Drill Press |
