CMWC Nano Core Board

Overview

The CMWC Nano Core is a modular Arduino Nano-based control and power board used in Calystron Works devices. It provides regulated 5 V and 3.3 V rails, RTC header support, and JST-XH connectors for quick component replacement or expansion.

Prototype Viewer

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Model —
Size —
Dimensions X: 0.142 m  Y: 0.092 m  Z: 0.080 m
Orbit X:000°   Y:000°

Specifications

Input Voltage5 V DC (USB-C or header)
Regulated Outputs5 V / 3.3 V
ConnectorsJST-XH 2-pin, 4-pin (RTC)
Logic MCUArduino Nano (ATmega328P)
MountingM2 screws, 3D-printed case compatible

Pinout

D2Display 1 — DataConnects to TM1637 CLK
D3Display 1 — ClockTM1637 DIO line
D4Display 2 — DataSecond display channel
D5Display 2 — ClockTM1637 DIO line
A4 / SDAI²C DataRTC communication line
A5 / SCLI²C ClockRTC clock line
VIN5 V InputMain power rail
GNDGroundCommon reference

Service Notes

This board is designed for field-replaceable use. If a connector is damaged, desolder using low heat and replace with a standard 2.54 mm JST-XH header. Ensure polarity markings match silkscreen.

Firmware can be reflashed over USB using the CalWork Loader.

Bill of Materials

U1Arduino NanoMicrocontroller core
R110 kΩ resistorPull-down for reset line
J1JST-XH 2-pinPower connector

Service Notes

Code Formatting Example

digitalWrite(LED_BUILTIN, HIGH);
ESP32 JST-XH RTC

Assembly Diagram

CMWC Nano Core layout

Annotated layout showing connector orientation and test points.

Revision: Rev.A    Maintainer: Calvin Parsons    Last Updated:
Asset ID: CW-CMWC-A001
QR: Links to documentation for this revision.

Downloads

⚠️ This revision is superseded by Rev.B
✅ Active Revision — Rev.A

Used In

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