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# Repository SectionsIf you feel lost regarding working with any sensors or boards used in the system, check Useful Guides section at the bottom of this page.</br>__Feel free to change the code on the Arduinos and platforms. Visitors and students can get editing access to the repository from Leon Santen or Odalys Benitez.__
The master Arduino measures the battery voltage with a voltage divider circuit- >= 27 V | Violet- between 25 and 27 V | __Green__- between 24. For precise voltage measurements, it is recommended to use `(analogRead(pin) + 0.5) * 5.0 / 1024.0` [^preciseVoltage]3 and 25 V | __Orange__- < 24.3 V | __Red__
## backporch-arduino
[[File:Porch_In this section, code-anemometer.jpg|border|thumb|Anemometer data logger prototype on porch]]We are using a Vortex wind sensor. One revolution per second equals 2.5 mph. Since our anemometer has a relay (a mechanical switch), it creates a _switch bounce_. Therefore, we need a debounce circuit.[[File:WindSpeed Porch Oct14specific comments and tips can be written down for future collaboration if comments in the code don't feel appropriate.jpg|border|thumb]]_
_A bug with the current code seems to be related to saving the dateTime string. The dateTime string is saved incorrectly when there should be a trailing 0 in front of the minute reading. I believe that the current code does not include an additional 0 to save minute readings below 10. ## master-arduino
The wireless communication system uses the LoRa platform at 915 Mhz. For detailed information on what LoRa is and how it works, please refer to the [[LoRa research]] page.## anemometer
The diagram for states and communication codes is on [Whimsical]We are using a Vortex wind sensor. One revolution per second equals 2.5 mph. Since our anemometer has a relay (https://whimsicala mechanical switch), it creates a _switch bounce_. Therefore, we need a debounce circuit.com</rf-states-and-communication-codes-TEZgio2TPLtG5tm47541Hq). The prior link redirects you to the diagrambr>[[File:WindSpeed Porch Oct14. jpg|500px]]
#__Voltage measuring with voltage divider circuit__ For precise voltage measurements, it is recommended to use `(analogRead(pin) + 0.5) * 5.0 / 1024.0` [^preciseVoltage]. ## References
no edit summary
The electrical control unit is a wireless communication system that monitors the battery voltage and broadcasts other information. Please refer to this the [GitHub Repository"WoodlandHarvestControlSystem"](https://github.com/LSanten/WoodlandHarvestControlSystem) for the code for all Arduinos.The over-the-air communication works on the LoRa system at 915 Mhz.</br>
#LoRa Network On the Arduinos that are integrated into the system, we use the [Dragino LoRa shield](https://wiki.dragino.com/index.php?title=Lora_Shield). In the image below, you can see how the pins on the Dragino LoRa shield are assigned. This is useful as not all pins on the shield are useable. This is especially important on Arduino Unos that don't have as many pins as the Arduino Megas.</br>[[File:Lora board.JPG|500px]]</br>_The Dragino LoRa shield. Blue-boxed pins are not used by the shield and are free to be used._ ## Nodes The following nodes are curently in use: ### master-arduino The master Arduino measures the battery voltage with the [Adafruit INA260](https://www.adafruit.com/product/4226?gclid=Cj0KCQiA4feBBhC9ARIsABp_nbUfI0ajLIOyZSA2bku_JZfo73gYy_W1wFGoZthBykCbWl1sPe3xmiYaAnboEALw_wcB) and broadcasts information wirelessly to the other Arduinos. The wireless system uses the [[LoRa research|LoRa protocol]] to communicate at 915 Mhz. For detailed information on what LoRa is and how it works, please refer to the [[LoRa research]] page. The diagram for states and communication codes is on [Whimsical](https://whimsical.com/rf-states-and-communication-codes-TEZgio2TPLtG5tm47541Hq). The prior link redirects you to the diagram. Purpose:</br>- Sense and broadcast battery voltage Data transmission:</br>- _float_ of battery voltage ### client_arduino_responsive-light[[File:GlowingBucket.jpeg|250px]]</br>_The glowing crystal indicates the batterie's charge status._</br> Purpose:</br>- Receive battery voltage and change colors to indicate battery status Data transmission:</br>- NA #### Color legend
## anemometerRepository sections - coding comments
# Wireless communication codes# client_arduino_responsive-lightThis unit receives the battery voltage from the master Arduino in the mudroom. Based on the voltage, the LED crystal shines in different colors.
_A bug with the current code seems to be related to saving the dateTime string. The dateTime string is saved incorrectly when there should be a trailing 0 in front of the minute reading. I believe that the current code does not include an additional 0 to save minute readings below 10._
# Opportunities to improve the system
- We are currently supplying power to the Arduinos via USB. If we used DC use efficient Buck converters from the batteries to the Arduinos, we might save some electricity.- install a gateway for a LoRa WAN network # Helpful tools and guides ## Tools
The [falstad online circuit simulator](https://www.falstad.com/circuit/circuitjs.html) is great to quickly test a circuit, check its output voltage or behavior. ## Useful Guidesand tips
__Real Time Clock Setup for SD3231__
https://www.digikey.com/en/maker/blogs/introduction-to-lora-technology
[^preciseVoltage]: http://www.skillbank.co.uk/arduino/measure.htm#:~:text=Precise%20voltage%20measurement%20with%20the,number%20between%200%20and%201023.
