Weather Monitoring Using Onion Omega and HIH7130

Weather Monitoring with Onion Omega, Its a powerful SBC. Comes with cloud connectivity, Ethernet, WiFi, uart , I2C & lot of GPIO.

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Few days back we received Onion Omega. Its a wonderful small computer, it has ethernet, wifi, uart , I2C and lot of GPIO. it supports all the major languages so you can use your existing codes in it with a little modification. Since last few years i have been using Pi, Arduino and beaglebone but this small computer is just wonderful, its 1/4 in size in comparison to pi and almost equal to arduino nano.
To make this project you will need these part.

1. Onion Omega

2. HIH7130

3. Connecting cables

4. I2C adapter

Connecting the hardware is really simple, all you will need to do is plug your Onion omega into the I2C adapter and connect with a HIH7130 mini module. If you are not comfortable with soldring the wires then getting an adapter is the best solution.

Why I2C adapter:: lot of time people connect wrong wires and they kill there sensor

we are using HIH7130 sensor for measuring the humidity and temp. Honeywell HumidIcon Digital Humidity/Temperature Sensors are digital output-type relative humidity and temperature sensors combined in the same package. These sensors provide an accuracy level of ±3%RH. With industry-leading long-term stability, true temperature-compensated digital I2C, Industry-leading reliability, Energy efficiency and Ultra-small package size and options. Other accuracies which are available: ±1.7 %RH (HIH9000 Series), ±2.0 %RH (HIH8000 Series), ±3.0 %RH (HIH7000 Series), and ±4.0 %RH (HIH6100 Series).

Why I2C :: I2C protocol is so easy to use and we can chain lot of different different devices with it as long as address don't conflict with each other.

Onion omega is so easy to setup. if you are new to onion omega you can follow this guide. Getting started with onion omega

make sure you install python I2C lib in you onion omega using these commands

opkg update
opkg install python-light pyOnionI2C

after installing these commands run i2cdetect -y 0

you will see I2C address of HIH7130.


wiring diagram

Adobe Portable Document Format - 294.80 kB - 05/24/2016 at 19:39


  • 1 × HIH7130 humidity sensor
  • 1 × onion omega iot
  • 1 × pca9306 Interface and IO ICs / Other Interface ICslevel sifter

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