Measurement Device for Carotage System

1. Review

• Purpose: Brief overview of the measurement device’s role within the carotage system.
• MCU: ATmega328
• Revision: v1
• Software version: v0.1.1
• Last Updated: 27.07.2025

2. Device

3. Application

4. Power & Interfaces

• Power
  • Voltage Supply Range: 8 – 24 V
  • Average Input Current: 300 mA
• Interfaces
  • RS‑485 (isolated)
  • Tension Sensor based on bridge scheme with diff. amp
    • DAC1: 0.5 – 8 V
      Offset control for tension sensor
    • ADC: 10‑bit (internal ATmega328)
  • Magnet Tag Sensor based on UGN3503 Holla sensor IC
    • DAC2: 2 – 3 V reference
      Offset control for magnet tag sensor
    • GPIO:
      • High = no tag
      • Low = magnet tag
  • Encoder optical or magnet variants
    • Incremental AB
    • TWI
    • ST+ / ST−

5. Pinout

References

• Hardware schemes: https://oshwlab.com/emile102201/meansur_rs485_2024-05-19_16-24-03/