1.6 KiB
1.6 KiB
Experiment 01 - Sensor Calibration
Purpose
The purpose of experiment 1 is to map the analog output values of the hydration sensor to different levels of water concentration in soil. This mapping will be necessary to adjust the user experience of the final device.
Components and equipment
- Arduino board to run code
- Three male to male jumper cables
- One moisture sensor
- A cup of soil
- Water
Methodology
- Prepare the code. Three versions of the code will be used raw, slightly
smoothed and heavily smoothed.
- Raw version outputs the sensor's measurement to the serial port in real-time, unfiltered.
- The slightly smoothed version will take 10 measurements with 50ms of delay between each and return the mean.
- The heaviliy smoothe version will take 100 measurements with 50ms of delay between each and return the mean.
- Prepare the soil
- In a small recipient (weight: 80g), place 200g of soil.
- Let it dry for X days (collection on 24/10/2022) to obtain the driest possible soil.
- The next steps will be performed repeteadly by adding 10ml of water to the
soil at each step. Start by first measuring the completely dry-soil. Ensure
that the water is distributed uniformly across the soil. For each amount of
water up to a max of 200ml, and for each version of the code:
- Obtain measurements from the sensor. If the measurement is unstable, record the observed range and the most frequent value.
- Finally, obtain measurements in a glass of pure water, with no soil at all.
Results
Make line chart with measurement by hydration level.