Temper
Temperature controlling is easy with Temper. It uses an improved PID algorithm to decrease overshoots and regulate based on continued inputs.
Installation
Add this line to your application's Gemfile:
gem 'temper-control', require: 'temper'
And then execute:
$ bundle
Or install it yourself as:
$ gem install temper-control
Usage
To start, create an instance of Temper::PID. The PID algorithm can be configured with
custom minimum and maximum values for ease of integration with external control systems
(PWM-controlled heating elements, for example). Once created, run Temper::PID#control
in your control loop, feeding it sensor data.
Minimum Interval Calculation
The algorithm being used is minimum interval and will not recalibrate until the time interval
has passed before recalibrating. This helps mitigate excess compensation and inconsistent
adjustment. The update interval is also configurable in Temper with the interval
option.
Directional Control
When handling cooling-based temperature control, negative values are a pain for
translation. To assist with this, Temper uses a directional control parameter. The two
possible states are :direct
and :reverse
. When using :reverse
, negative values
are inverted.
Tuning
Temper's PID is manually tuned with the tune
method, which takes a Kp, Ki, and Kd value. By
default, Temper will set them to 1.0
Example
require 'temper'
temper = Temper::PID.new(interval: 1000, minimum: 0, maximum: 1000, direction: :direct)
temper.tune(9.0, 25.0, 6.0) # Set Kp, Ki, and Kd
temper.setpoint = 100.0 # Set target temperature
while input = read_sensor() # Replace read_sensor with your external system
output = temper.control(input)
# output is a value betwen minimum and maximum. This can be used for thresholds or
# PWM-based control
end
Contributing
- Fork it
- Create your feature branch (
git checkout -b my-new-feature
) - Commit your changes (
git commit -am 'Add some feature'
) - Push to the branch (
git push origin my-new-feature
) - Create new Pull Request