September 2017
Intermediate to advanced
206 pages
4h 34m
English
Content preview from Intelligent IoT Projects in 7 Days
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Controlling soil moisture using a PID controller
Now we can change our PID controller simulation using a real application. We use soil moisture to decide whether to pump water. The output of the measurement is used as feedback input for the PID controller.
If the PID output is a positive value, then we turn on the watering system. Otherwise, we stop it. This may not be a good approach but is a good way to show how PID controllers work. Soil moisture data is obtained from the Arduino through a wireless network.
Let's write this program:
import matplotlib matplotlib.use('Agg') import PID import time import matplotlib.pyplot as plt import numpy as np from scipy.interpolate import spline P = 1.4 I = 1 D = 0.001 pid = PID.PID(P, I, D) pid.SetPoint ...Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.