A Node-RED PID control node and a Hystersis node

PID Control Node

This node has 2 outputs, the first is for heating control, the second is
for cooling control.

Both outputs provide a floating point value between 0 and 10.

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The node takes the following configuration values:

- Gain: The % gain to apply to the difference between the setpoint and
input value
- Ti: The time in seconds over which to apply the gain value
- Dead Band: The +/- each side of the setpoint to consider the setpoint
reached
- Recalculation Time: The time in seconds between each calculation of
values
- Setpoint Topic: the topic a message should have to set the setpoint
- Fire Topic: the topic a message should have to enable/disable Fire
mode
- Fixed Value Topic: the topic a message should have to enable/disable
fixed output mode
- Fixed Value: the value to output when in fixed mode, +ve for heating
-ve for cooling

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Before you can use the node you need to set the setpoint, to do this
you need send a message with the setpoint value as the payload and a
topic set to the Setpoint Topic configured in the editor UI.

Fire mode sets all outputs to 0. Fire mode is enabled by sending a
message with a payload of false to and a topic equal to the
Fire Topic. To disable Fire mode send a message with a payload of
true and a topic equal to the Fire Topic

Hysteresis Node

This node gives a true output value when the input values are
outside the deadband of the setpoint and a false when the setpoint
is reached.