CO2 control

Monitor for CO2

Features

• EIA-485 interface
• SCD-30 sensor
• Input volatage 24 V
• RP-2040
• 4 LEDs
• Relay
• Oxygen Cell input < 150 mV (not yet tested)
• 0-10 V output
• 1 wire interface

Issues and Limitations

The following issues with the current versions are known:

• RX/TX to SCD30 need to be switched
• doesn't connect via USB
  • USB C symbol should have been a receptable, not plug
  • Thus, B7/B6 are not connected to D+/-

Connection

XLR male, pinout

• 1. GND, Blue
• 2. +24V, Blue/White
• 3. 485A, Orange
• 4. 485B, Orange/White

Firmware

The co2control-fw firmware samples the SCD-30 regulary and exposes the measurements via modbus.