Thermostat Configuration

Configure SmartPID thermostat hardware setup and relay assignments for heating and cooling control.

This guide walks through the SmartPID on-device configuration screens for setting up a single-channel thermostat, typically used for fermentation temperature control. Access these screens by navigating to Configuration on your SmartPID device.

Configuration Menu

From the main Configuration menu, select HW setup to configure the hardware relay assignments for your thermostat.

HW Setup -- Control and Heating/Cooling Modes

In the HW setup screen, configure the following settings:

• Control Mode: Set to T-static for standard thermostat operation (maintaining a fixed target temperature).

• Heating Mode: Set to ON/OFF for relay-based heating control.

• Cooling Mode: Set to ON/OFF for relay-based cooling control.

• Multi Control: Set to Dual if you are using both heating and cooling on a single channel.

• Out1 Heating: Set to Relay1 to assign heating output to the first relay.

HW Setup -- Relay Assignments and Button Beep

Scroll down in HW setup to configure the remaining relay assignments:

• Out1 Heating: Relay1 -- Heating output is assigned to relay 1.

• Out1 Cooling: Relay2 -- Cooling output is assigned to relay 2.

• Out2 Heating / Out2 Cooling: Set to OFF if you are using a single-channel configuration.

• Button Beep: Set to No to disable the audible button press beep, or leave enabled as preferred.

Process Parameter -- Set Points and Timers

In the Process parameter screen, configure the temperature set points and timers:

• Set-Point 1: The target temperature for heating (e.g., 55.0). This is the temperature Brewfather will control when a fermentation profile is sent.

• Set-Point 2: The target temperature for cooling (e.g., 40.0).

• Timer 1 / Timer 2: Duration timers for each set point. Set to 0:00 if you are controlling the profile from Brewfather.

• PID1 Kp: The proportional gain for the PID controller (e.g., 15.0). Adjust based on the responsiveness of your heating system.

Process Parameter -- PID Tuning and Hysteresis

Scroll down in Process parameter for additional PID tuning settings:

• PID1 Kd: The derivative gain (e.g., 0.0). Helps reduce temperature overshoot.

• Hysteresis 1: The temperature band around the set point before the controller activates (e.g., 0.3). A smaller value provides tighter control but more frequent relay cycling.

• Reset DT 1: Derivative reset time (e.g., 5.0).

• Fridge Delay 1: Compressor delay in minutes (e.g., 3). Protects refrigeration compressors by preventing rapid on/off cycling.

• PID2 Kp: Proportional gain for the second PID channel (e.g., 15.0), used if you have a dual-channel setup.

Related docs

• SmartPID

• Devices