I checked the shield template: it’s a 53.5 × 76 mm Uno R3 outline with only the header/connectors in place, so adding a 10-button grid will require both schematic additions and a board resize.

I’m blocked from making the change because this project is read-only for your account. Fork/remix this shield into a project you can edit, or grant edit access, and I’ll expand the board and add a clean 2×5 button grid wired into the shield immediately.

I’ll inspect the current shield template, look up the ADS1259 wiring requirements, then plan the Arduino connections and two LEDs. If this template is still read-only, I’ll give you the exact fork/edit path and wiring plan instead of making unsafe partial changes.

I found the ADS1259BIPW in the library and verified the key datasheet pins: SPI pins, DRDY, START, RESET/PWDN, AVDD/DVDD, reference pins, and required bypass/reference handling. The current project is a read-only template, so I’m preparing the exact implementation plan rather than making partial edits that cannot be saved.

I’m blocked from editing this project because your access is view-only on the Arduino Uno R3 Shield Template.

Planned implementation for an editable fork:

Fork or duplicate the template into a project you can edit, then I can add and wire the parts directly.