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--- amc2022:groups:start [2022/09/09 21:23] – [References] emilie001
+++ amc2022:groups:start [2023/01/05 14:38] (current) – external edit 127.0.0.1
@@ Line 13: / Line 13: @@
   * 10k potentiometer
   * 220 ohm resistor
-  * Bread boards
+  * Breadboards
   * male-to-male jumper cable
 ====Elegoo Uno====
-The Elegoo Uno is a microcontroller board that can be programmed with Arduino IDE. It has several pins than be set as in or output for data with using different functions. By installing additional libraries into Arduino IDE the board is able to communicate with a variety of sensors modules and other micro controllers the board has a great range of use.
+The Elegoo Uno is a microcontroller board that can be programmed with Arduino IDE. It has several pins than can be set as in or output for data by using different functions. By installing additional libraries into Arduino IDE the board is able to communicate with a variety of sensor modules and other microcontrollers the board has a great range of use.
 ===How to use the Elegoo Uno===
 As mentioned above the Uno is programable with Arduino IDE. To program it you have to connect the board via USB. The written code can then be compiled and uploaded onto the microcontroller.
 ====LCD Display====
-The LCD display can be used to print values obtained from the measurement of a sensor. It can be used instead of the serial monitor to make a system independent and mobile. The display needs a 5V power supply. Depending on how many of the pins are utilized it can either be used in 4-bit or 8-bit mode. Because of limited availability of digital output pins on the Eleggoo Uno  4-bit or 4-wire mode is usually preferred.
+The LCD display can be used to print values obtained from the measurement of a sensor. It can be used instead of the serial monitor to make a system independent and mobile. The display needs a 5V power supply. Depending on how many of the pins are utilized it can either be used in 4-bit or 8-bit mode. Because of the limited availability of digital output pins on the Eleggoo Uno  4-bit or 4-wire mode is usually preferred.
 ===How to use the LCD===
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 ===How to use DHT11===
-In order to use the sensor module it has to be appropriately connected to the microcontroller board. The module has three pins, VCC, Ground and a data pin (see <imgref dht11.jpeg>). The VCC is connected to the 5V power outlet, GND is connected to GND and the data pin is connected to a digital output pin.\\ To program the sensor the right Arduino library has to be installed, in this case the DHT.h library. To test if the sensor was set up properly the following code was used. The heat index was mainly included to test printing characters in as many positions of the LCD as possible and would later be replaced with the CO<sub>2</sub> concentration.
+In order to use the sensor module, it has to be appropriately connected to the microcontroller board. The module has three pins, VCC, Ground and a data pin (see <imgref dht11.jpeg>). The VCC is connected to the 5V power outlet, GND is connected to GND and the data pin is connected to a digital output pin.\\ To program the sensor the right Arduino library has to be installed, in this case the DHT.h library. To test if the sensor was set up properly the following code was used. The heat index was mainly included to test printing characters in as many positions of the LCD as possible and would later be replaced with the CO<sub>2</sub> concentration.
 <code c++>
@@ Line 96: / Line 96: @@
 float temp = dht.readTemperature(); // Read temperature in celcius
 float hum = dht.readHumidity(); // Read relative humidity in %
-float hi = dht.computeHeatIndex(temp, hum); // Heat index gives the temperature that is felt by humans; dependend on temp. & humidity
+float hi = dht.computeHeatIndex(temp, hum); // Heat index gives the temperature that is felt by humans; depending on temp. & humidity
 lcd.setCursor(0,0); // setCursor function sets where the text start 0 is the first line and first field
@@ Line 120: / Line 120: @@
 <WRAP group>
 <WRAP half column>
-The MQ 135 is a sensor that measures the concentration of CO2 and other gases in air. It needs a 5V power supply to operate and has a working current of 150mA. The module has one digital and one analog pin for data output. The material used to sense the gas concentration is SnO<sub>2</sub> which is a metal oxide semiconductor which changes its resistance in contact with gases. R<sub>0</sub> is the internal resistance of the sensor in clean air, and R<sub>S</sub> is the resistance of the sensor in contact with different gases. With the R<sub>0</sub> and R<sub>S</sub> values the concentration in ppm can be calculated. The stainless steal mesh layer as seen in <imgref mq135.jpeg> is there to protect the sensor from particular matter and other disturbances.
+The MQ 135 is a sensor that measures the concentration of CO2 and other gases in air. It needs a 5V power supply to operate and has a working current of 150mA. The module has one digital and one analog pin for data output. The material used to sense the gas concentration is SnO<sub>2</sub> which is a metal oxide semiconductor which changes its resistance in contact with gases. R<sub>0</sub> is the internal resistance of the sensor in clean air, and R<sub>S</sub> is the resistance of the sensor in contact with different gases. With the R<sub>0</sub> and R<sub>S</sub> values the concentration in ppm can be calculated. The stainless steel mesh layer as seen in <imgref mq135.jpeg> is there to protect the sensor from particular matter and other disturbances.
 </WRAP>
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 The project went through different development phases. The circuit as well as the code have been changed over time. Every sensor was tested separately before combining the system together. At first, the LCD display was set up as the basis of the project as described [[https://wiki.eolab.de/doku.php?id=amc2022:groups:start#LCD Display|above]]. Then the DHT11 was added next. After that, the RTC was initiated and incorporated to print the time on the LCD. Lastly, the MQ135 was calibrated and added to the system. Initially, the LCD showed the heat index obtained by the DHT11, which was replaced by the CO<sub>2</sub> concentration. Because of lacking space on the display, the concentration is not displayed with its appropriate unit (ppm) and CO<sub>2</sub> had to be abbreviated as "C".  The calibration and troubleshooting process for the MQ135 is further described in the chapter [[https://wiki.eolab.de/doku.php?id=amc2022:groups:start#Results and Discussion|Results and Discussion]].
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 =====Conclusion and Outlook=====
 All in all, the system is functional. The communication between the sensors, the microcontroller and the LCD is working. It is unsure how accurate the obtained measurements are but as it is the system could be used as tool to give meaningful information and improve indoor air quality.\\
-Building and expanding the system stepwise helped to understand the different components and the code better. If this same project had to be recreated a bigger LCD and a more controllable environment to calibrate and set-up the gas sensor would be recommended. The bigger LCD would increase the accessibility and even more variables could be displayed. Additionally, things like the unit of CO<sub>2</sub> concentration could be included with no problem.
+Building and expanding the system stepwise helped to understand the different components and the code better. If this same project had to be recreated a bigger LCD and a more controllable environment to calibrate and set-up the gas sensor would be recommended. The bigger LCD would increase the accessibility and even more variables could be displayed. Additionally, things like the unit of CO<sub>2</sub> concentration could be included with no problem.\\
+====Video====
+{{youtube>fCxlqfbRjq8?}}