September 2017
Intermediate to advanced
206 pages
4h 34m
English
Content preview from Intelligent IoT Projects in 7 Days
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How it works
First, we define our PID parameters:
P = 1.4 I = 1 D = 0.001 pid = PID.PID(P, I, D) pid.SetPoint = 0.0 pid.setSampleTime(0.01) total_sampling = 100 feedback = 0 feedback_list = [] time_list = [] setpoint_list = []
After that, we compute the PID value during sampling. In this case, we set the desired output values as follows:
- Output 1 for sampling from 20 to 60
- Output 0.5 for sampling from 60 to 80
- Output 1.3 for sampling more than 80
for i in range(1, total_sampling): pid.update(feedback) output = pid.output if pid.SetPoint > 0: feedback += (output - (1 / i)) if 20 < i < 60: pid.SetPoint = 1 if 60 <= i < 80: pid.SetPoint = 0.5 if i >= 80: pid.SetPoint = 1.3 time.sleep(0.02) feedback_list.append(feedback) ...
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