PCB ESP32

Description

Build your own Wireless Weather station. This station includes:

• Temperature
• Humidity
• Pressure
• Rain Level
• Wind Speed
• Wind direction
• Battery monitor

There are three versions available:

• One uses ESP8622 module and some ATTINYs
• one uses ESP32 and only one ATTINY for wind direction
• one uses an Arduino Mini together with ATTINY24 for wind direction inside weather station and publish messages by 433 Mhz.

Code and schematics for any solution can be found in corresponding subfolders of folder 'code'

Operation mode

ESP8266

Wind speed and rain gets detected by pin change interrupt of ATTINYs. There is a power hungry device called WEMOS D1 mini pro, which deep sleeps most time. Every few minutes, it wakes up, collect data from other devices by I2C, send everything to your MQTT broker and sleeps again.

ESP32

Wind speed and rain gets count by ULP co-processor of ESP32 module. Every few minutes, ESP32 wakes from deep sleep, read count values from ULP, power up I2C devices and sends everything to your MQTT broker. Then it sleeps again.

Arduino Pro Mini

Because ESP devices are pretty power hungry, I wanted to build something more power saving. Therefore, a Arduino Pro Mini is used inside the weather station. Most time it sleeps and count wind and rain by interrupts. Every x minutes, it wakes up, power up I2C devices (BME280 and ATTINY24 for wind direction), reads values and send them using cheap 433MHz module. You find a working example based on ESP8266 module acting as a bridge between 433 Mhz and MQTT, so it receives data over 433MHz and publish them like before using MQTT.

Project site

You find all 3D printed parts at Thingiverse https://www.thingiverse.com/thing:3718078

A video is here https://youtu.be/xa0Dt5vs0kM

BOM

This package includes software for the following components

ESP8266

• 2x ATTINY85 (wind speed, rain and battery level)
• 1x ATTINY24 (wind direction)
• Wemos D1 Mini pro (or other ESP8266 device)
• 1x BME280
• Please find a complete BOM in BOM.txt file

Moreover you need some device to program ATTINYs. This can be done with any Arduino device. There are plenty of tutorials out there.

ESP32

• 1x ATTINY24 (wind direction, see folder Wireless Weather)
• ESP32 (DOIT DevKit V1 with 30 GPIOs)
• 1x BME280

For further information, please see readme file in ESP32 folder

Arduino Pro Mini

• 1x Arduino Pro Mini
• 1x ATTINY24 (wind direction)
• 1x BME280
• 1x 433MHz receiver, transmitter pair

You also need some code and device to receive the data and process them further. This can be done with any device, like Arduino, ESP8266, ESP32, Raspberry PI and so on. To get a complete working example, I added some code for ESP8266 (WEMOS D1 mini pro) which acts as some kind of bridge between 433MHz and MQTT, meaning it receives the data send by Arduino Pro Mini and send them using MQTT protocol.

Required Software

For ATTINYs, you need this package
https://github.com/SpenceKonde/ATTinyCore
https://github.com/rambo/TinyWire

For ESP8266 and ESP32, I used this one
https://arduino.esp8266.com/stable/package_esp8266com_index.json
https://github.com/knolleary/pubsubclient
https://github.com/adafruit/Adafruit_BME280_Library

When using Arduino Pro mini, you need these packages as well
https://github.com/rocketscream/Low-Power
https://github.com/PaulStoffregen/RadioHead
https://github.com/adafruit/Adafruit_BME280_Library

License

Copyright (c) 2019 by Patrick Weber

Private-use only! (you need to ask for a commercial-use)

You should have received a copy of the GNU General Public License along with this program. If not, see http://www.gnu.org/licenses/.

Private-use only! (you need to ask for a commercial-use)