Bresser 5-in-1/6-in-1/7-in-1 868 MHz Weather Sensor Radio Receiver for MicroPython using Texas Instruments CC1101

Tested with MicroPython v1.27.0 on ESP32

Hardware Connection

The following diagram shows the wiring between the ESP32 and the CC1101 radio module:

graph LR
    subgraph ESP32["ESP32 Module"]
        ESP32_3V3["3.3V"]
        ESP32_GND["GND"]
        ESP32_GPIO23["GPIO 23<br/>(MOSI)"]
        ESP32_GPIO19["GPIO 19<br/>(MISO)"]
        ESP32_GPIO18["GPIO 18<br/>(SCK)"]
        ESP32_GPIO27["GPIO 27<br/>(CS/SS)"]
        ESP32_GPIO21["GPIO 21<br/>(GDO0)"]
        ESP32_GPIO33["GPIO 33<br/>(GDO2)"]
    end

    subgraph CC1101["CC1101 Radio Module"]
        CC1101_VCC["VCC (3.3V)"]
        CC1101_GND["GND"]
        CC1101_MOSI["MOSI/SI"]
        CC1101_MISO["MISO/SO"]
        CC1101_SCK["SCK/SCLK"]
        CC1101_CSN["CSn"]
        CC1101_GDO0["GDO0"]
        CC1101_GDO2["GDO2"]
    end

    ESP32_3V3 --> CC1101_VCC
    ESP32_GND --> CC1101_GND
    ESP32_GPIO23 --> CC1101_MOSI
    ESP32_GPIO19 --> CC1101_MISO
    ESP32_GPIO18 --> CC1101_SCK
    ESP32_GPIO27 --> CC1101_CSN
    ESP32_GPIO21 --> CC1101_GDO0
    ESP32_GPIO33 --> CC1101_GDO2

Note: Pin assignments are defined in src/config.py and use the ESP32's VSPI (SPI ID 2) hardware interface. The SPI pins (MOSI, MISO, SCK) are the hardware-defined defaults for VSPI on ESP32.

Installation

Prerequisites

• MicroPython v1.27.0 or later installed on your ESP32
• CC1101 radio module connected to your ESP32 as described in the Hardware Connection section

Installation Steps

1. Copy the source files to your MicroPython device:

   Copy all files from the src/ directory to your ESP32:

   • BresserDecoder.py - Decoder implementations for all supported Bresser sensor types
   • cc1101.py - CC1101 radio module driver
   • config.py - Hardware configuration (pin assignments)
   • main.py - Example implementation

   You can use tools like mpremote, ampy, rshell, or Thonny IDE to transfer files to your device.

2. Configure hardware pins (if needed):

   If your hardware setup differs from the default pin assignments, edit config.py on your device to match your wiring.

3. Customize the implementation:

   Important: The provided main.py is an example implementation that demonstrates how to receive and decode Bresser weather sensor data. It is intended as a starting point for your own application-specific implementation.

   You should customize main.py based on your requirements, such as:

   • Integration with other sensors or systems
   • Data logging or storage
   • Network connectivity (WiFi, MQTT, etc.)
   • Power management
   • Error handling and recovery

4. Run the application:

   Once the files are copied and configured, you can run the receiver by executing:

   Or reset your ESP32 if main.py is set to run automatically on boot.

Supported Bresser Sensor Protocols

• 6-in-1 Decoder

  • 6-in-1 weather sensors (temperature, humidity, UV, wind, rain)
  • Soil moisture/temperature sensors
  • Pool/spa thermometer

• 5-in-1 Decoder

  • 5-in-1 weather sensors
  • Professional Rain Gauge

• 7-in-1 Decoder

  • 7-in-1/8-in-1 weather sensors
  • Air Quality (PM) sensor
  • CO2 sensor
  • HCHO/VOC sensor

• Lightning Sensor Decoder

  • Lightning sensor

• Leakage Sensor Decoder

  • Water Leakage sensor

Sequential Decoder Fallback -- main.py tries all decoders in sequence until one succeeds

Example Console Output

TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
--- RSSI: -82.0 dBm ---
TTTTTTTTTTTTTTTTT
--- RSSI: -72.5 dBm ---
Soil Moisture Sensor: ID: 0x52828827  Type: 4  Channel: 1  Battery: OK  Startup: No
  Temperature: 24.5°C  Moisture: 0%
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT

• Each 'T' marks a message reception timeout
• RSSI: Received Signal Strength Indicator
• Common sensor data and sensor type specific measurement values
• Only an RSSI value without subsequent data: unknown or invalid message (message integrity check failed)

Legal

This project is in no way affiliated with, authorized, maintained, sponsored or endorsed by Bresser GmbH or any of its affiliates or subsidiaries.