109 lines
6.0 KiB
Markdown
109 lines
6.0 KiB
Markdown
# ATMEGA328PU_lowPower_weather_station
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## What is it ?
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An ATMEGA328PU and NRF24L01+ based weather station operating on a single 18650 li-ion battery (or equivalent) and a solar panel.<br />
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On [this page](/Pages/station.html) is displayed the data collected by this very unit !
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**Check the LICENSE.md file at the root of this project for more information.**
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## What are the functionalities ?
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The station is equipped with the following sensors and functionalities :
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* Temperature (BMP280 and HTU21)
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* Humidity (HTU21)
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* Compensated humidity (HTU21)
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* Pressure (BMP280)
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* Sunlight (LDR)
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* Battery level indication (ATMEGA's 10 bit ADC)
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## Power consumption :
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* Around **60µA** during sleep.
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* Around a **13mA** spike during data transmission and **4mA** during sensor data collection.
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* The solar panel is enough to even charge the battery, it should thus never need to be replaced or recharged externally.
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## Project folder architecture :
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``` json
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/
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|_src This folder contains all the C/C++ file sources.
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| \_app This folder contains the main app and it's dependencies.
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| |_libs This folder contains all the required 3rd party libraries that should be put in "Arduino\libraries" folder in order for the app to compile.
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| |_test This folder contains a test program which was used to test the dependencies.
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|_schematic This folder contains all the files associated with the schematic.
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| \_KiCad This folder contains the KiCad files associated with the project.
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| |_ATMEGA328PU_lowPower_weather_station.pdf Which is the most recent schematic exported as a pdf for quick viewing.
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|_documentation This folder may one day contain the associated documentation if needed.
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|_.gitignore
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|_LICENSE.md
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|_README.md The content of this page
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```
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## Getting started :
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1. Clone this repository : git clone http://web-directories.cf/git/Th3maz1ng/ATMEGA328PU_lowPower_weather_station.git
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2. Go to **"src\libs"** folder of this project and copy and paste its content in your "Arduino\libraries" folder.
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3. Open the app.ino file with the Arduino IDE and select the "Arduino Pro or Pro Mini" board with processor : (Atmega 3.3V 8 Mhz).
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4. Compile and Upload !
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5. To receive the data sent by the station, you can check this other [project](/git/Th3maz1ng/ESP8266_dual_NRF24l01_gateway) which is the receiver end.
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## Configuration options :
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You may change some settings present in the ***definition.h*** file.
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Set **SLEEP_4_SEC_INTERVAL** which corresponds to the time interval between each data transmission in 4 seconds increments. 1 minute by default corresponds to a value of 15.
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Set **SERIAL_DEBUG_ENABLED** to **1** to get debug output on the serial console.
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Set **SERIAL_BAUD_RATE** to the desired baudrate for debugging.
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Set **ADC_QUANTUM** to adjust the quantum if your VREF is not the same as mine.<br />
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To do so, measure which voltage does the VCC pin of your Arduino board output and divide it by 1024 (10 bit ADC resolution).
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Set **VOLTAGE_DIV_COEFF** to something different if you changed the voltage divider resistor values.
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Set **RADIO_CHANNEL** to the NRF's RF channel (between 0 and 125). **Do not forget to set the receiver station up on the same channel**
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Set **RADIO_NODE_ADDRESS** to change it's 5 byte address if you feel like it. **Do not forget to set the receiver station up on the same address**
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Set **RADIO_PA_LEVEL** to adjust the transmit power level if needed (higher the power, higher the current consumption)
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Set **ENABLE_LNA** to true or false to enable or disable the Low Noise Amplifier on the NRF modules if it has one.
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## The hardware :
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Here is a list of the parts used to build the station with a link to where you can buy them :
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* [Solar panel : 72x72](https://fr.aliexpress.com/item/4001240640418.html?spm=a2g0s.9042311.0.0.27426c3741mIVH)
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* [NRF24L01+](https://fr.aliexpress.com/item/32976054389.html?spm=a2g0o.cart.0.0.657d3c00t37c7e&mp=1)
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* [TC4056 (1 cell lipo charge/discharge protection)](https://fr.aliexpress.com/item/4000522397541.html?spm=a2g0o.productlist.0.0.175b30dfajsyO5&algo_pvid=203adaed-55ba-4678-a3e4-3aafcad89952&algo_exp_id=203adaed-55ba-4678-a3e4-3aafcad89952-1)
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* [BMP280 pressure sensor](https://fr.aliexpress.com/item/32228095913.html?spm=a2g0s.9042311.0.0.27426c3741mIVH)
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* [SHT/HTU 21 humidity sensor](https://fr.aliexpress.com/item/32787282185.html?spm=a2g0s.9042311.0.0.27426c3741mIVH)
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* [ATMEGA328PU board](https://fr.aliexpress.com/item/4000190780977.html?spm=a2g0o.store_pc_allProduct.8148356.4.66547f0dNb2qkV)
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* [3.3V LDO for the power rail : RT9013-33PB](https://fr.aliexpress.com/item/4001097171645.html?spm=a2g0o.productlist.0.0.48aa7800HoFD4h&algo_pvid=454c2fa4-a1a9-4ec2-9398-00d598a20b67&algo_exp_id=454c2fa4-a1a9-4ec2-9398-00d598a20b67-0)
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* [LDR type : 5528](https://fr.aliexpress.com/item/32623615207.html?spm=a2g0o.productlist.0.0.41a66ceaAE4l8B&algo_pvid=b7699cb3-9564-4a0e-bfb2-cf66f2917b04&algo_exp_id=b7699cb3-9564-4a0e-bfb2-cf66f2917b04-0)
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* [Small junction box](https://www.amazon.com/LeMotech-Dustproof-Waterproof-Electrical-85mmx85mmx50mm/dp/B075X14RVH/ref=sr_1_2?dchild=1&keywords=junction+box+3.4+3.4+2&qid=1626903891&sr=8-2)
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***If you have any questions, do not hesitate to contact me at : bugreport[at]laposte[dot]net***
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## Finally here are some pictures of the PCB and device :
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### PCB top view :
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### PCB back view :
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### Device's internals :
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### Device's internals with the PCB removed :
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### Device form factor :
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### Device's LDR and solar panel :
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### Device's antenna and SHT/HTU 21 cover :
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