mbuhidar / woodstoveregulator Goto Github PK

Current controller is printed with white filament and the LCD light and internal power supply lights bleed through the case. Reprint case in black with provision for additional input button or pot per Issue #6.

Current internal connections are basic breadboard type connections. These connections should made with soldered wires or a custom PCB.

Stove exhaust stack temp range can be 200-400 F, currently hard coded to 275 F in V2.0. Add control functionality via right knob via new 'adjust temperature set point' mode. Need to determine user-initiated sequence to enter this mode and adjust the set point.

Current v2.0 code accumulates the integral parameter the entire time the exhaust stack temp is rising from a low temp towards the set point temp after a refill. This results in the controller going into 'fill' mode inappropriately and in some cases, the controller can go into 'end' mode even when the temp is rising. This is caused by the integral parameter building past the individual triggers for those two modes.

When the controller enters either of these two modes, the controller does not re-enter 'auto' mode until the temp reaches the set point. This results in significant temp overshoot. Even if the controller doesn't enter one of these modes, the integral windup can cause overshoot in 'auto' mode.

This new function / feature is intended to check for temp rise that would indicate stove refill and temperature build towards set point. If refill condition is detected, the integral term should be reset to zero in order to prevent integral windup.

Stove temp range can be 200-400 F, currently hard coded to 250 F. Add control via left knob and add display for temperature set point.

Display setting can be hard coded vs using input pot.

Need a feature to allow instant feedback via the LCD display for the following conditions:

• when setting damper position in manual mode (using the lower half of the pot range)
• when setting the target temp in auto mode (using the upper half of the pot range)

Due to lack of physical user inputs to the controller, the single controller-attached potentiometer is being overused for mode and range selection. The v2.2 code uses the upper half of the pot range to set the target temp in auto mode and the lower half of the pot range sets the damper position in manual mode. The input range available is not ideal to control these modes and usage requires 'expert' knowledge of how the one knob works.

Need to add a physical input (push button switch?) to set and / or control auto mode vs manual mode.

This function was intended to be disabled, so need to understand how it was executed. Suspect PID value accumulations over many days of continuous operation.