Temp sensor & an outlet

#1

I have a temp sensor that I’m using to control an outlet that I have a space heater plugged into
The heater will come on but will not shut off In the morning the temp was above the 10c
What have I done wrong
Do I need to add a block of time on the first IF thats outside of the other times
Thanks

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#2

To me the temperature should be the trigger and the time is the secondary condition. I would swap line 42 and 40 so that it looks at temperature first before time. That might fix the piston from triggering it off.

#3

Actually, you might just want to delete line 40. Right now this piston will only turn off the heater if the temperature gets warm enough between 4PM and 4AM. Once it is after 4am, there is no way to turn off the heater. Seems like it doesn’t matter what time it is, if the temperature is above 20c, you want to turn off the heater.

#4

I would change all of the is less than or greater than to falls below or rises above. You want triggers not conditions.

I Also agree with guxdude, you want the heater to turn off no matter the time if it goes above a certain temperature, I would think.

#5

Thanks for the info I made the changes as you each suggested
After 3.59 am the heater should shut off (as long as its above 10c
It does not so I added
IF time is after 4 am then turn off
this still does not work
after 3.59 am the heater will not shut off
Any suggestions

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#6

On the piston enable trace, set logging to full and trigger it again. Then post the green snapshot showing trace as well as the full logs. This will show us if the off command was sent and thus not processed by the device or if it was not sent at all for whatever reason.

#7

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12/17/2019, 9:28:03 AM +807ms
+0ms ╔Received event [Houseboat].test = 1576592883806 with a delay of 0ms
+80ms ║RunTime Analysis CS > 20ms > PS > 41ms > PE > 20ms > CE
+83ms ║Runtime (39146 bytes) successfully initialized in 41ms (v0.3.110.20191009) (82ms)
+84ms ║╔Execution stage started
+96ms ║║Comparison (decimal) 16.5 is_less_than (integer) 10 = false (1ms)
+98ms ║║Condition #2 evaluated false (10ms)
+99ms ║║Condition group #1 evaluated false (state did not change) (11ms)
+112ms ║║Comparison (time) 34083909 is_between (time) 32460000 … (time) 33900000 = false (8ms)
+114ms ║║Condition #21 evaluated false (11ms)
+117ms ║║Cancelling statement #21’s schedules…
+122ms ║║Requesting time schedule wake up at Wed, Dec 18 2019 @ 9:01:00 AM EST
+126ms ║║Condition group #6 evaluated false (state did not change) (25ms)
+135ms ║║Comparison (decimal) 16.5 is_greater_than (integer) 20 = false (2ms)
+136ms ║║Condition #13 evaluated false (7ms)
+138ms ║║Condition group #10 evaluated false (state did not change) (8ms)
+141ms ║║Condition group #20 evaluated true (state did not change) (0ms)
+158ms ║╚Execution stage complete. (73ms)
+173ms ║Setting up scheduled job for Wed, Dec 18 2019 @ 9:01:00 AM EST (in 84776.021s)
+182ms ╚Event processed successfully (182ms)

Clear

Full

#8

Your piston is now using triggers so is only going to run when the motion sensor reports a change in the temperature. Nothing at all is going to happen just because of the time of day. Sometimes conditions are the correct solution …

At the moment what your piston says is:

When the temperature changes:

  • If it has just dropped below 10C at any time, turn on switch 4.
  • If it has just dropped below 17C and it is 4:01pm to 3:59am, turn on switch 4.
  • If it has just risen above 20C at any time, turn off switch 4.

The bit about after 4am will not do anything as it has to be before 3:59am to get there.

So what exactly do you need it to do that it doesn’t at the moment?

#9

In the updated piston I changed back to conditions because for testing I changed the times to this morning and could not get the heater to come on when it was a trigger so I changed back to conticions and it came on

So for the most part its working with the original time of 4:01pm the heater comes on but at 3:59 the heater will not turn off. Thats when I added the condition after 4am turn off but that didnt work either

What should happen is
Between 4am and 4pm
heater come on when less than 10c
turn off when greater than 12c

Between 4:01pm and 3:59am
heater come on when less then 17c
Heater off when greater then 20

I changed the piston to hopefully to reflect that

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#10

Try this and see if it works for you

Heater
Heater.png1178×977 46.2 KB

#11

Thanks Llha63
Tried your piston last night with the same result. The heater should shut off after 4am the temp is 16c
but it doesent
Any ideas

#13

The code “drops below” and “rises above” are triggers. This means that they are only true for a brief moment.

For example:

pic

This portion will only trigger when Sensor 3’s temp changes from 50 to 49… and only within your time restrictions. This means, if the temp drops that low at 3AM, the outlet will not be touched when 4 o’clock rolls around.

One way to get around this is to add a new block to the bottom:

Every day at 4:01AM
    Do something
END EVERY
#14

Thanks WCmore
do you literly mean add “Do something”

#15

Would it be better if I seperated it into 2 seperate pistons one for each time period
I dont understand
Do something
END EVERY

#16

Is this what you ment adding the block aat the bottom. I also changed the triggers to conditions

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#17

Sorry… Just walked in the door…

In this case, I meant the missing command, such as:

Every day at 4:01AM
    Do 
        IF temp is greater than 16 degrees
            Then turn off heater
        END IF
END EVERY
#18

Perhaps an on event method would be a better way to go. Every time the temp changes on the sensor then look at the conditions and decide what to do.

#19

can you give me an example

#20

@Terminal is correct… I did not notice that all four triggers were identical.

Here is one way to combine your four triggers into only one:

IF Sensor's temperature changes     <-- Trigger
Then
    IF Time is between X and Y      <-- Condition for specific time
    Then
        IF temp is less than T      <-- Condition for specific time
            Then Turn on
        END IF
        IF temp is greater than U   <-- Condition for specific time
            Then Turn off
        END IF
    ELSE
        IF temp is less than V      <-- Condition for OTHER times
            Then Turn on
        END IF
        IF temp is greater than W   <-- Condition for OTHER times
            Then Turn off
        END IF
    END IF
END IF

This method has only a single trigger (temperature changes)… The rest of the piston is just to determine which action (if any) is to take place.

#21

sample
sample.png1178×565 51.3 KB

Something like this?