myinvent / esp32-lora-rs485-agriculture-kit

Affordable Agriculture Kit ESP32 LoRa 915 MHz RS485 Modbus Controller with Industrial Grade Soil Temperature, Moisture, EC, pH & NPK Sensor

ESP32 LoRa RS485 Agriculture Kit

Introducing an affordable Agriculture Kit ESP32 LoRa 915 MHz RS485 Soil Temperature, Moisture & Electrical Conductivity Sensor

Consists of 2 Main Components:

1. ESP32 LoRa RS485 Modbus Controller: The heart of this board is a mighty ESP32 Wi-Fi based microcontroller under ESP-WROOM-32 module as it is compatible with Arduino programming. It has RS485 controller, thus able to convert the RS485 signal from the soil sensor. Integrated with LoRa 915 MHz wireless communication, programmable for Malaysia's LoRa frequency which is 923 MHz.
2. Industrial-Grade Soil Sensor: Measure multi-parameters of soil including Temperature, Moisture, pH, EC and Nitrogen, Phosphorus and Potassium (NPK). The output signal is RS485 and can be operated broad range of voltage from 5~30 VDC.

ESP32 Controller Board Specifications

• ESP32-WROOM-32 Module for microcontroller with Wi-Fi and BLE communication.
• Compatible with Arduino and Micropython Programming
• USB Serial Chip Silicon Labs CP2104
  • Download CP2104 Driver from Silicon Labs Website
• LoRa Module 915 MHz (Programmable to 923 MHz for Malaysia)
• 0.91" I2C OLED Display
• Power by Micro USB, Battery or 5 VDC
• On-board LiPo Charging Circuit

Soil Sensors Specifications

• Operating Voltage: 5 ~ 30 VDC
• Communication Protocol: RS485
• Temperature
  • Measurement Range: -40°C ~ 80 °C
  • Measurement Accuracy: ±0.5 °C
• Moisture Content
  • Measurement Range: 0 ~ 100 %
  • Measurement Accuracy: ±3 %
  • Measurement Range: 0 ~ 100 %
  • Measurement Accuracy: ±3 %
• Electrical Conductivity (EC).
  • Measurement Range: 0 ~ 20000 uS/cm
  • Measurement Resolution: 1 uS/cm
• pH
  • Measurement Range: 3 ~ 9
  • Measurement Resolution: 0.1
• NPK
  • Measurement Range: 0 ~ 2999 mg/kg
  • Measurement Resolution: 1 mg/kg

RS845 Communication Details

• Data Bits: 8-bit
• Parity Bits: NO
• Stop Bit: 1
• Error Checking: CRC
• Baud Rate: 2400, 4800 (default), 9600
• Device Address: 0x01
• Function Code: 0x03
• Data Code: 16 bits
• Request Frame (8 Bytes)

Address Code	Function Code	Start Address Register	Length of Register	CRC
0x01	0x03	0x00 0x00	0x00 0x07	0x04 0x08

• Example of Response Frame (19 Bytes)

Address Code	Function Code	Byte Number	Moisture	Temperature	EC	pH	Nitrogen (N)	Phosphorus (P)	Potassium (K)	CRC
0x01	0x03	0x0E	0x01 0xE6	0x01 0x55	0x05 0xDC	0x01 0x34	0x00 0x20	0x00 0x25	0x00 0x30	0x04 0x08

• Byte Response Example Calculation
  • Moisture Content = (0x01 * 256 + 0xE6) * 0.1 = 48.6 %
  • Temperature = (0x01 * 256 + 0x55) * 0.1 = 34.1 °C
  • EC = (0x05 * 256 + 0xDC) = 1500 uS/cm
  • pH = (0x01 * 256 + 0x34) * 0.1 = 3.08
  • N = (0x00 * 256 + 0x20) = 32 mg/kg
  • P = (0x00 * 256 + 0x25) = 37 mg/kg
  • K = (0x00 * 256 + 0x30) = 48 mg/kg

Shipping List

• Agriculture Kit ESP32 LoRa 915 MHz RS485 Modbus Controller
• Industrial Grade Soil Sensor
• Waterproof Case

Shopping Now

• Shopee
• Myduino: Temperature & Moisture, pH, EC and NPK
• Myduino: Temperature & Moisture

How To?

1. Interface and Wiring | Wire Colour: Brown (5~30 VDC), Black (GND), Yellow (RS485 A) and Blue (RS485 B)

   

   

2. Choose your development environment, Arduino or Micropython.
3. Use example program from folder Example Programs
4. Upload or flash the program into the microcontroller. For Arduino IDE, choose board "ESP32 Dev Board".

Contact Us

• Call or WhatsApp [phone]

esp32-lora-rs485-agriculture-kit's Issues

Deviations in readings

Hello,
I would like to thank you for your work! It has helped me a lot. I have a small problem with the nitrogen and phosphorus readings. Do you also have such deviations in the readings ? In clean water I have such readings:

01:00:16.695 -> Nitrogen (N): 50.00 mg/kg
01:00:16.695 -> Phosporus (P): 114.00 mg/kg
01:00:16.695 -> Potassium (K): 104.00 mg/kg