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pm:prj2025:iotelea:alexa_andreea.voicu [2025/05/26 02:18] alexa_andreea.voicu [Rezultate obținute] |
pm:prj2025:iotelea:alexa_andreea.voicu [2025/05/26 21:44] (current) alexa_andreea.voicu [Software Design] |
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| The LCD display shows live values of temperature and humidity and the alerts for the user, while LEDs indicate status: | The LCD display shows live values of temperature and humidity and the alerts for the user, while LEDs indicate status: | ||
| - | Green = optimal | ||
| - | Yellow = warning | + | * Green = optimal |
| - | + | * Yellow = warning | |
| - | Red = out of range | + | * Red = out of range |
| The buzzer notifies the user when human intervention is needed. | The buzzer notifies the user when human intervention is needed. | ||
| Line 161: | Line 160: | ||
| The buzzer is passive, meaning it needs a signal with a defined frequency. | The buzzer is passive, meaning it needs a signal with a defined frequency. | ||
| It only activates when the system transitions into the red alert state | It only activates when the system transitions into the red alert state | ||
| - | It emits three tones with decreasing frequency (1000 Hz → 800 Hz → 600 Hz), each followed by a short pause | + | It emits three tones with decreasing frequency (1000 Hz → 800 Hz → 600 Hz), each followed by a short pause. |
| - | Total alert duration: approx. 2 seconds | + | Total alert duration is approx. 2 seconds. |
| - | The tone is played using Arduino’s tone() function and not repeated unless a new red alert is triggered | + | The tone is played using Arduino’s tone() function and not repeated unless a new red alert is triggered. |
| The fan is connected via an IRF520 module and is triggered only if the temperature exceeds 27°C. | The fan is connected via an IRF520 module and is triggered only if the temperature exceeds 27°C. | ||
| Line 181: | Line 180: | ||
| ===== Concluzii ===== | ===== Concluzii ===== | ||
| + | While my project wasn’t very complex, it gave me the opportunity to integrate multiple hardware components and manage real-time system logic. The availability of the libraries for the DHT22 sensor, LCD, and SD card modules helped me a lot with my work, allowing me to focus more on logic and the incubator's behavior. | ||
| - | ===== Resurse ===== | + | The biggest challenge was controlling the fan. I initially underestimated the current it needed, and quickly realized that driving it directly from a digital pin was not possible. So I needed to used a 12V battery, but wasn't sure how i would actually connect it so that it would work without any risks. After some research, I added an IRF520 Mosfet module, and thinking now, a flyback diode would have been a great addition to protect against voltage spikes when switching off the fan. |
| + | Another issue was that I didn't know what the timing conflicts would be between SD card access and LCD updates. At one point, I | ||
| + | was trying to write to the SD card while displaying messages caused flickering and delays. I had to be careful about when and how often updates happened, and add short delays to give each module time to operate without interfering. | ||
| + | |||
| + | Overall, the project helped me learn how to integrate sensors, fans and storage, and how to troubleshoot the small issues that appear only when everything is running at the same time. | ||
| + | ===== Resurse ===== | ||
| + | * [[https://www.arduino.cc/reference/en/|Arduino Official Documentation]] – language reference and built-in functions | ||
| + | * [[https://github.com/adafruit/DHT-sensor-library|DHT Sensor Library by Adafruit]] – for reading temperature and humidity values | ||
| + | * [[https://github.com/johnrickman/LiquidCrystal_I2C|LiquidCrystal I2C Library]] – used to control the 1602 I2C LCD display | ||
| + | * [[https://www.arduino.cc/en/Reference/SD|Arduino SD Library]] – for reading/writing data to the microSD card | ||
| + | * [[https://www.arduino.cc/reference/en/language/functions/advanced-io/tone/|tone() – Arduino Function]] – used to generate PWM audio signals for passive buzzers | ||
| + | * [[https://cdn-shop.adafruit.com/datasheets/Digital+humidity+and+temperature+sensor+AM2302.pdf|DHT22 Datasheet]] – for technical specifications of the sensor | ||
| + | * [[https://www.youtube.com/watch?v=17vqLv508Uw|Using IRF520 Mosfet]] – for connection to the fan | ||
