I have a whole house fan that takes a look at temperature and if the inside temp is warmer than outside the whole house fan turns on. Its quite a bit more complex than that - I'll share my code, but when the outside temp and inside temp is close the fan turns on and off rapidly, when there is a bigger swing it runs as it should. I'm trying to find a way to prevent the rapid on/off and looking for guidance. Here's my code:
context.data = context.data || {};
switch (msg.topic) {
case "stat":
context.data.stat = msg.payload;
break;
case "outside":
context.data.outside = msg.payload;
break;
case "inside":
context.data.inside = msg.payload;
break;
case "comfort":
context.data.comfort = msg.payload;
break;
case "low":
context.data.low = msg.payload;
break;
case "mintocomfort":
context.data.mintocomfort = msg.payload;
break;
}
var stat = context.data.stat;
var outside = context.data.outside;
var inside = context.data.inside;
var comfort = context.data.comfort;
var low = context.data.low;
var mintocomfort = context.data.mintocomfort;
var fanspeed = fanspeed;
var stage = stage;
var msg1 = {};
var msg2 = {};
var msg3 = {};
msg1.topic = 'fan';
msg2.topic = 'mintocomfort';
msg3.topic = 'temp';
if (stat == 'on')
{
if (inside - 1 >= outside)
{
if (inside >= low)
{
if (inside >= comfort)
{
if (inside >= comfort)
{
mintocomfort = 1;
}
if (outside <= inside-8)
{
if (comfort + 3 > inside)
{
fanspeed = 'min';
stage = '1 min';
}
else
{
fanspeed = 'max';
stage = '2 max';
}
}
else if ((outside > inside-8) && (outside <= inside-5))
{
if (comfort + 3 > inside)
{
fanspeed = 'min';
stage = '3 min';
}
else
{
fanspeed = 'midmax';
stage = '4 midmax';
}
}
else if ((outside > inside-5) && (outside <= inside-3))
{
if (comfort > inside)
{
fanspeed = 'min';
stage = '5 min';
}
else
{
fanspeed = 'mid';
stage = '6 mid';
}
}
else if ((outside > inside-3) && (outside <= inside-1))
{
fanspeed = 'midmin';
stage = '7 midmin';
}
else
{
fanspeed = 'min';
stage = '17 midmin';
}
}
else if (inside < comfort)
{
if (mintocomfort == 1)
{
fanspeed = 'min';
stage = '8 min';
}
else
{
fanspeed = 'off';
stage = '9 off';
mintocomfort = 0;
}
}
else
{
fanspeed = 'off';
stage = '19 off';
mintocomfort = 0;
}
}
else if (inside < low)
{
fanspeed = 'off';
stage = '10 off';
mintocomfort = 0;
}
else
{
fanspeed = 'off';
stage = '100 off';
mintocomfort = 0;
}
}
else if (inside >= outside)
{
if (inside >= low)
{
if (inside >= comfort)
{
if (inside + 2 >= outside)
{
mintocomfort = 1;
}
if (outside <= inside-8)
{
if (comfort + 3 > inside)
{
fanspeed = 'min';
stage = '01 min';
}
else
{
fanspeed = 'max';
stage = '02 max';
}
}
else if ((outside > inside-8) && (outside <= inside-5))
{
if (comfort + 3 > inside)
{
fanspeed = 'min';
stage = '03 min';
}
else
{
fanspeed = 'midmax';
stage = '04 midmax';
}
}
else if ((outside > inside-5) && (outside <= inside-3))
{
if (comfort > inside)
{
fanspeed = 'min';
stage = '05 min';
}
else
{
fanspeed = 'mid';
stage = '06 mid';
}
}
else if ((outside > inside-3) && (outside <= inside-1))
{
fanspeed = 'midmin';
stage = '07 midmin';
}
else
{
fanspeed = 'min';
stage = '017 midmin';
}
}
else if (inside < comfort)
{
if (mintocomfort == 1)
{
fanspeed = 'min';
stage = '08 min';
}
else
{
fanspeed = 'off';
stage = '09 off';
mintocomfort = 0;
}
}
else
{
fanspeed = 'off';
stage = '019 off';
mintocomfort = 0;
}
}
else if (inside < low)
{
fanspeed = 'off';
stage = '010 off';
mintocomfort = 0;
}
else
{
fanspeed = 'off';
stage = '0100 off';
mintocomfort = 0;
}
}
// else if (inside < outside)
else if ((inside < outside) && (mintocomfort == 1))
{
fanspeed = 'off';
stage = '011 off';
mintocomfort = 0;
}
else
{
fanspeed = 'off';
stage = '0111 off';
mintocomfort = 0;
}
}
//else if (stat == 'off')
else
{
fanspeed = 'off';
stage = '12 off';
mintocomfort = 1;
}
msg1.payload = fanspeed;
msg2.payload = mintocomfort;
msg3.payload = stage;
node.status({fill:"green",shape:"dot",text:`Stage: ${stage}, Speed: ${msg1.payload}, Inside: ${inside}, Outside: ${outside}, Status: ${stat}, Stage: ${msg2.payload}`})
return [msg1, msg2, msg3];
