CWX ESP32-C3 Portable Compact Weather Station

CWX is a compact, self contained portable IoT Weather Station.

Following on from the original popular CWX (Compact Weather Station), a number of improvements have flourished and this new CWX V3 has been released.

Features

• Barometric Pressure
• Ambient Temperature
• Humidity
• Ambient Light Level

Top level improvements

• ESP32-C3 MCU
• Type C USB Interface
• Improved LDO Current assisting any External Devices
• On-Board ESP32-C3 D1 UART Interface
• On-Board EEPROM for Data Logging and Configuration
• User Button
• RGB LED
• Added Dallas OneWire Interface
• Added I2C External Interface
• Improved Light Sensor
• On-Board 32.768 kHz XTAL for Real Time Clock
• Fully Tested

Also see AQIX ESP32C3 - Air Quality Monitor IoT Weather Station - Hackster.io

The New CWX3 Board

Purchase: See DitroniXUK on eBay

Overview

Example AQIX output shown on ThingSpeak (includes CO2)

https://thingspeak.mathworks.com/channels/2692889

CWX3Preliminary Features:

Based on the new Espressif ESP32C3 Mini, which has both Wi-Fi and BT, the AQIX SDK board is provided with onboard Battery Holder or External DC Input.

Interface for programming, and development, is thought a standard Type C USB, into the onboard UART and ESP32C3, so making development and use, completely self-contained.

Using the provided I2C interface, an OLED display can be plugged directly into the board, if required, for local monitoring and status information.

Opensource CWX Firmware is provided on our GitHub, using the standard PlatformIO platform. This monitors Barometric Pressure, Temperature, Humidity, Light Level and CO2 Air Quality information, which can then be sent to your Home Automation, or cloud service, via provided MQTT, HomeAssistant or Domoticz etc., as standard.

CWX3 Specification and Features

· Sensors Included

• High Accuracy Barometric Sensor - Bosch BME 280 Module, providing: -
• Barometric Pressure 300...1100 hPa (millibar) - Accuracy ±0.25% - which is equivalent to 1m at 400m height change - RMS Noise 0.2 Pa - which is equivalent to 1.7 cm -
• Temperature -40 to 85°C - Temperature coefficient offset ±1.5Pa/K. - which is equivalent to ±12.6cm at 1 °C temperature change -
• Humidity - 0 to 100 % - Accuracy tolerance ±3% relative humidity - Hysteresis ≤2% relative humidity
• Ambient Light Sensor
• SFH2440, providing spectral sensitivity adapted to human eye sensitivity
• Std. Light A; T = 2856 K Minimum 7 nA/lx
• Spectral range of sensitivity λ10% typically 400 to 690 nm
• Wavelength of max sensitivity λS max typically 620 nm
• MCU Espressif ESP32-C3 Mini - 2.4GHz Wi-Fi (802.11b/g/n) and Bluetooth 5
• ESP32-C3-MINI-1-N4 (PCB Antenna)
• ESP32-C3-MINI-1U-N4 (External Antenna via U. FL cable)
• On-Board 32.768 kHz XTAL for Real Time Clock

· Type C Programming / Debug

• Type C USB Connector
• CH340K USB UART 2Mbps Transceiver
• Easy programming. Select ‘ESP32C3 Dev Module’
• BAUD rate up to 921600 to speed up Flashing
• Serial Monitoring Debug and Remote Logging
• Power Can Be Taken from USB 5V (when Flashing)

· EEPROM (I2C)

• AT24C64 64Kbit
• On-board Data Logging
• On-board Parameters
• Firmware setup user parameters and configuration

· Battery or External DC Operation

o Powered by:

• 1 x CR123 Lithium battery
• External DC such as USB 5V or 4.5 to 15V DC

· Battery Voltage Monitor

• ADC provides battery voltage reading

· External DC Input

• AMS1117 LDO allowing use of external DC input 4.5V to 15V

· External Temperature

o Dallas OneWire Interface for External Temperatures

• Example Probe Sensor for Greenhouse

· RGB LED - Status

• Configured to three GPIO’s for easy Firmware control

· I2C OLED Connector

• Configurable 3V3 Pin 1 and 2 polarities
• PCB 4 Pin Header Connector

· Buttons

• Reset
• User (Program or GP9 Detect)

· Enclosure

• Designed to fit into a Waterproof Clear Cover Enclosure

· Compact Design and Easy to Use

• Compact PCB 63mm x 51mm
• 4 x M3 mounting holes
• Operating Ambient Temperature -10 to +60 °C
• Optional Conformal Coating – on request.

· Ordering

• Boards are due in stock during October 2024. Details to follow.

o TwoVersions are in production.

• ESP32-C3-MINI-1-N4 (PCB Antenna)
• ESP32-C3-MINI-1U-N4 (External Antenna via U. FL cable)

Further Information

Additional information, and other technical details on this project, maybe found in the related repository pages.

Repository Folders

• Code(Code examples for Arduino IDE and PlatformIO)
• Datasheets and Information(Component Datasheets, Schematics, Board Layouts, Photos, Technical Documentation)
• Certification(Related Repository Project or Part, Certification Information)

Repository Tabs

• Wiki(Related Repository Wiki pages and Technical User Information)
• Discussions(Related Repository User Discussion Forum)
• Issues(Related Repository Technical Issues and Fixes)

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• Visit the related Project plus the relatedDiscussions and Wiki Pages. See tab in each separate repository.
• Project Community Information can be found at https://www.hackster.io/DitroniX
• DitroniX.net Website - Contact Us
• Twitter: https://twitter.com/DitroniX
• Supporting the STEM Projects - BuyMeACoffee
• LinkedIN: https://www.linkedin.com/in/g8puo/

Dave Williams, Maidstone, UK.

Electronics Engineer | Software Developer | R&D Support | RF Engineering | Product Certification and Testing | STEM Ambassador

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