Task 9 : Soil Moisture Sensor

• Measured the moisture level of the soil in the pot using the capacitive soil moisture sensor and displayed the moisture level on the serial monitor. Gave an alert , if the soil moisutre level is below a certain level.
• There are two types of moisture sensors:
  • 1.Resistive moisture sensor
  • 2.Rapacitive moisture sensor.

Highly recommend is using the capacitive moisture sensor, because of the following reasons:

• The resistive soil moisture sensor corrodes over time. The electrical current that flows between the sensor's probes causes electrochemical corrosion.
• The capacitive soil moisture sensor does NOT corrode over time. The sensor's electrodes are not exposed and no electrical current folows between them.

working principle :

• A capacitive soil moisture sensor works by measuring the change in capacitance caused by varying moisture levels in the soil. As the water content increases, the dielectric constant of the soil rises, which increases the capacitance. This change is converted into a corresponding voltage output by the sensor’s internal circuitry, where higher soil moisture results in a higher output voltage.

Click here for code

• Teakawyas : Learnt to measure soil moisture and control the water level

Task 10 : FIRE ALARM SYSTEM WITH EMAIL ALERTS

• A flame/fire sensor is an electronic device used to detect the presence of a flame or fire. It operates based on the detection of specific light wavelengths emitted by a flame, typically in the ultraviolet (UV) or infrared (IR) spectrum.
• Developed a fire alarm system using ESP32 microcontroller equipped with fire sensors.
• Upon detecting fire, the ESP32 triggers an email alert through Wi-Fi, notifying designated recipients about the potential fire hazard for timely response and action.

Principle of Operation:

• Flames emit radiation in the UV and IR range. The flame sensor uses a photodiode or phototransistor that is sensitive to these wavelengths.
• When a flame is present, the sensor detects the radiation and produces a corresponding electrical signal. This signal is then sent to a microcontroller or an alarm system for further action.
• I used Blynk IOT app to send email notifications.

with Email Alert :

Click here for Email alert code

without Email Alert :

Click here for without email alert code

• Teakawyas : Understood about how to use Blynk IOT app to send email alerts.

Task 11 : Motion detection

• I did the task motion detection using HC-SR501 Pir motion sensor.

Working principle :

• Every living being (like humans and animals) emits infrared (IR) radiation due to body heat.
• The PIR sensor has two infrared-sensitive pyroelectric sensors inside it. When there is no motion, both sensors detect the same IR levels → no output (LOW).
• When a warm body moves across its field of view. One sensor sees a temperature change before the other. This imbalance triggers the sensor to output HIGH (motion detected).

Click here for code

• Teakawyas : Learnt HC-SR501 Pir motion sensor isn't much effective to detect motion.

Task 12 : Read and Display Vitals

• To Measure heart rate and blood oxygen levels using MAX30100 sensor .
• I tried too much times to do this task with multiple MAX30100 sensors.But no one could not able to work properly. So I went on some youtube videos to check wether is there any mistakes with sensor . I found some soldering issues with sensor.Hence i followed to solder the sensor to work properly.
• Even though after trying this, sensor couldn't able to measure heart rate and blood oxygen levels. So I quit it and had done other tasks .

Thank you for going through my Level 2 Report 😊