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latinet:unicaes:workshops:sensors-23 [2023/08/29 23:58] – [3.1. Analog sensors (ex. capacitive soil moisture sensor)] jan.sonntaglatinet:unicaes:workshops:sensors-23 [2023/08/30 00:22] (current) jan.sonntag
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 Remember, in the Arduino world, libraries are your trusted companions, facilitating smooth communication and opening doors to limitless possibilities. Remember, in the Arduino world, libraries are your trusted companions, facilitating smooth communication and opening doors to limitless possibilities.
 +
 +Good-To-Know: Most libraries come with examples that can get you started quickly.
  
 ===== 3. Inputs / Protocols ===== ===== 3. Inputs / Protocols =====
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 <imgcaption image3|Wiring of the analog sensor>{{ :latinet:unicaes:workshops:capacitive-soil.png?400 |}}</imgcaption> <imgcaption image3|Wiring of the analog sensor>{{ :latinet:unicaes:workshops:capacitive-soil.png?400 |}}</imgcaption>
 <imgcaption image4|Schematic>{{ :latinet:unicaes:workshops:capacitive-soil_schem.png?600 |}}</imgcaption> <imgcaption image4|Schematic>{{ :latinet:unicaes:workshops:capacitive-soil_schem.png?600 |}}</imgcaption>
 +
 +We also prepared a little sketch for you. Try to understand it. A good way to do so is to look up function documentation in the Arduino Documentation:
  
 <file ino read-analog.ino> <file ino read-analog.ino>
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   Serial.println("voltage: " + voltage);   Serial.println("voltage: " + voltage);
   Serial.println("value: " + sensorValue);   Serial.println("value: " + sensorValue);
 +  
 +  delay(1500);
 } }
 </file> </file>
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 ==== 3.2. 1-Wire (ex. temperature sensor) ==== ==== 3.2. 1-Wire (ex. temperature sensor) ====
  
-One-Wire is a protocol that is heavily used by the company Maxim Integrated. One of the most popular sensors using this protocol is the (deprecated) DS18B20. It is an easy-to-use temperature sensor, that is available in multiple different form factors. In this workshop we use two different variants:+One-Wire is a bus protocol that is heavily used by the company Maxim Integrated. One of the most popular sensors using this protocol is the (deprecated) DS18B20. It is an easy-to-use temperature sensor, that is available in multiple different form factors. In this workshop we use two different variants:
   - Water-Proof DS18B20   - Water-Proof DS18B20
   - DS18B20 on a PCB   - DS18B20 on a PCB
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 ==== 3.3. I2C (ex. ToF sensor) ==== ==== 3.3. I2C (ex. ToF sensor) ====
  
 +I2C is one of the most common sensor bus interfaces used. It requires 2 cables for communication. One is called SCL and the other is SDA. I2C in general is a serial interface. SCL is the serial clock. This is needed to synchronize the communication between two components. SDA is the actual serial data line. Here is where all the magic is happening. On one I2C bus, 127 slave devices can be attached. Therefore I2C is a master-slave protocol. The master will instantiate communication by calling for a specific address followed by a register it wants to read or write to, followed by some additional data in case of writing to a device. The slave device will give a response depending on the function called.
 +
 +The sensor used in the sensor is a ToF sensor called VL53L0X, which is able to measure distance pretty accurately.
 +
 +Have a look at the datasheet and the library:
   * [[https://www.st.com/resource/en/datasheet/vl53l0x.pdf | VL53L0X Datasheet ]]   * [[https://www.st.com/resource/en/datasheet/vl53l0x.pdf | VL53L0X Datasheet ]]
   * Here you can find a library for the sensor: [[https://github.com/adafruit/Adafruit_VL53L0X|Adafruit VL53L0X]]   * Here you can find a library for the sensor: [[https://github.com/adafruit/Adafruit_VL53L0X|Adafruit VL53L0X]]
  
-{{ :latinet:unicaes:workshops:tof_bb.png?400 |}}+<imgcaption image5|ToF Breadboard>{{ :latinet:unicaes:workshops:tof_bb.png?400 |}}</imgcaption> 
 + 
 +Task: Try to get the sensor to work with your microcontroller.
  
-==== 3.3. UART ====+==== 3.3. Good to know ====
  
 +Out there are more than just the protocols that we covered today. Here are some more that are worth researching if you are interested:
 +  * SPI
 +  * UART
 +  * Digital Interrupts
  
 ===== Recording ===== ===== Recording =====
  
latinet/unicaes/workshops/sensors-23.1693346307.txt.gz · Last modified: 2023/08/29 23:58 by jan.sonntag