SparkFun Arduino IoT Weather Station

Building a weather station can be rewarding whether you're an agriculturalist, professional meteorologist, or weather hobbyist. Create your own weather station effortlessly using SparkFun's Arduino IoT Weather Station, seamlessly monitored through Arduino Cloud, an all-in-one IoT platform that brings your creations to life in a snap. SparkFun created this Arduino library specifically for use with our MicroMod Weather Carrier Board (w/o/ UV Sensor) and MicroMod ESP32 Processor to allow users to easily record wind speed, wind direction, and rainfall data from our weather meter kit with reliable wireless capabilities.

The MicroMod Weather Carrier Board is a peripheral for the MicroMod ecosystem that allows you to create your own weather station with one of a multitude of processors. The carrier board in this kit includes two sensors: the BME280 temperature, pressure, and humidity sensor and the AS3935 Lightning detector.

Along with these on-board sensors, there is a 3-pin latch terminal & cables to add an external soil moisture sensor (also included) and a pair of RJ11 jacks to plug in the wind and rain sensors to connect the included Weather Meter Kit. To top it all off, there is a microSD card slot so you can plug in an SD card to log all that glorious weather data using the MicroMod processor of your choosing!

The rain gauge is a self-emptying bucket-type rain gauge, which activates a momentary button closure for each 0.011" of rain that is collected. The anemometer (wind speed meter) encodes the wind speed by simply closing each rotation switch. The wind vane reports wind direction as a voltage produced by the combination of resistors inside the sensor. The vane’s magnet could close two switches simultaneously, indicating up to 16 different positions, but we have found that eight positions are more realistic.

MicroMod is a modular interface ecosystem that connects a microcontroller “processor board” to various “carrier board” peripherals. Utilizing the M.2 standard, the MicroMod standard is designed to easily swap out processors on the fly. Pair a specialized carrier board for the project you need with your choice of compatible processor!

ESP32 MicroMod Processor Board:

  • General Features:
    • Dual-core Tensilica LX6 microprocessor
    • Up to 240MHz clock frequency
    • 520kB internal SRAM
    • 128mbit/16MB flash storage
    • Integrated 802.11 BGN WiFi transceiver
    • 2.7 to 3.6V operating range
    • 500µA sleep current under hibernation
    • 10-electrode capacitive touch support
    • Hardware accelerated encryption (AES, SHA2, ECC, RSA-4096)
  • Specific Peripherals made available on MicroMod ESP32:
    • 1x USB dedicated for programming and debug
    • 1x UART
    • 2x I2C
    • 1x SPI
    • 7x GPIO
    • 2x Digital Pins
    • 2x Analog Pins
    • 2x PWM
    • Status LED
    • VIN Level ADC
    • *Additional peripherals are available but are shared on dedicated MicroMod pins.

MicroMod Weather Carrier Board (w/o UV Sensor):

  • Barometric Pressure/Humidity/Temperature Sensor - BME280
    • Operated in I2C mode. I2C address: 0x77
  • Lightning Detector - AS3935
    • Operated in SPI mode.
  • 2 x RJ11 Connectors to connect Wind/Rain sensors.
  • 3-pin Latch Terminal to connect Soil Moisture sensor.

Weather Meter Kit:

  • Wind Vane
  • Cup Anemometer
  • Tipping Bucket Rain Gauge
  • Two-Part Mounting Mast
  • Rain Gauge Mounting Arm
  • Wind Meter Mounting Bar
  • 2 x Mounting Clamps
  • 4 x Zip Ties

Soil Moisture Sensor:

  • PCB Coated in ENIG (Electroless Nickel Immersion Gold)
  • 3-Pin Screw Terminal (Pre-Assembled)

SparkFun Arduino IoT Weather Station Product Help and Resources

MicroMod ESP32 Processor Board Hookup Guide

October 21, 2020

A short hookup guide to get started with the SparkFun MicroMod ESP32 Processor Board.

MicroMod Weather Carrier Board Hookup Guide

January 14, 2021

A quick guide to help to create your own MicroMod weather station using the MicroMod Weather Carrier Board and Processor of your choice.

Weather Meter Hookup Guide

July 20, 2017

How to assemble your very own weather meter!

Soil Moisture Sensor Hookup Guide

January 29, 2021

A quick hookup guide and project to get you started with the Soil Moisture Sensor from SparkFun.


Looking for answers to technical questions?

We welcome your comments and suggestions below. However, if you are looking for solutions to technical questions please see our Technical Assistance page.

  • Member #1611394 / about 3 weeks ago / 1

    Can this be powered by a LiPo battery / solar charger combo such as and

  • Member #1739876 / last month / 1

    In order to lower the cost of the kit a bit, it would have been nice to let the user chose the MCU (and an esp32 may not be appropriate (for various reasons), and some users may already own Micromod MCU).

  • jmst / last month / 1

    Can you confirm that the KIT 22636 includes UV sensor? Because the "Includes" tab states that the carrier board is "SparkFun MicroMod Weather Carrier Board w/o UV Sensor"

  • CyberchuckTX / last month / 1

    Please add/suggest a CASE for this kit. Preferably a simple 3D print OR a lasercut design. I have several suggestions for case designs if there's interest.

    • Hi, CyberchuckTX! This is a great question!

      We have a project releasing in the blog next week that shows how we assembled one of these kits on top of SparkFun HQ. I will see about posting that information this weekend, but most people are away for the Labor Day weekend. Sorry for the delay on that!

      We do provide some considerations for the enclosure for this kit in the blog, depending on whether or not you want to use a sealed or unsealed enclosure.

      EDIT: This is the enclosure we used in the video and in this Monday's Post!

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