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-   -   Espar 7 day timer is a pain to program, so I added a remote (https://sprinter-source.com/forum/showthread.php?t=82486)

cian128 01-20-2020 03:41 AM

Espar 7 day timer is a pain to program, so I added a remote
 
2 Attachment(s)
My old car had remote start but I didn’t want to go attacking my harness and deal with skreem, wait to start etc etc

The Espar gets the cabin and engine warm but preset only works for 3 days and have to remember to set it.

I bought one of these

Mini Relay Wireless Switch 12V 433Mhz Remote Control Relay Switch, Secure 1-Channel Micro Receiver with Transmitter System in Latched Mode DC 3.7V 5V 6V 7V 9V 12V https://www.amazon.com/dp/B077ZQMQDZ..._CPsjEb9FNDBRQ

It would be possible to get a 10A version of this, but this would be up to you to remember to switch it off! I didn’t want to chance a pocket dial and run the battery flat. So I ordered this

Timer Relay, DROK Time Delay Relay DC 5V 12V 24V Delay Controller Board Delay-off Cycle Timer 0.01s-9999mins Trigger Delay Switching Relay Module with LCD Display Support Micro USB 5V Power Supply https://www.amazon.com/dp/B07DFT2WDS..._dSsjEb6ZDA647

To support a timeout.

I configured the modules as follows

RF: Momentary

This is set by soldering two pad together and sends a pulse whenever A is pressed. B does nothing

Timer: P3 mode

This starts timer on pulse, and a second pulse cancels. Timeout also cancels the output.


Wiring

I spliced into + (red) and - (brown) And cut the yellow at the 7 day timer

RF module

+ wired to +
- wired to -
Com wired to +
NO wired to timer signal high

Timer module

+ wired to +
- wired to -
Input reference wired to -
Input high from RF NO
Output COM wired to yellow leaving console
Output NC wired to yellow coming from 7 day time
Output NO wired to + (this wire match factory gauge)

I wired this at my bench as a subassembly with main + and - wires leaving and splicing in easily. Cutting the yellow wire and fed right into screw terminals of the output relay.


In normal state the 7 day timer is in control through the NC contacts. When the timer is triggered by the RF module, it isolates the 7 day timer and connects the trigger to +. No back driving the 7 day timer.

Install

Pry the 7 day timer up and disconnect.
Pry shifter trim up
Unscrew one on left side under trim piece
Unscrew one under 7 day timer
Unscrew two underneath I think to remove the larger console piece

This gives lots of room too work. Lots of slack in the wires. I used VHB and stuck my subassembly to the side of the shifter bracket and reassembled. I did hot glue some wire loom over the programming buttons to prevent accidental pressing after I set it to 60 minutes.

I have not tested range but it works from my kitchen which is all that I need. I press the button when I make coffee, shower and by the time I get to work the cycle is complete.

Uses a few mA at rest and additional 50 mA when engaged

JFloFoto 01-20-2020 03:09 PM

Re: Espar 7 day timer is a pain to program, so I added a remote
 
I also hooked up a RF remote to my Heater Booster. Depending on range or the mood it's in, it may or may not fire it up. Been trying to figure out a way to wire an indicator light from the module to the top of the dash so I can look out from the house to make sure it's on. As you know wiring up these RF remotes takes some magic to figure out as the instructions are garbage.

Any suggestions?

cian128 01-20-2020 03:51 PM

Re: Espar 7 day timer is a pain to program, so I added a remote
 
Quote:

Originally Posted by JFloFoto (Post 842640)
I also hooked up a RF remote to my Heater Booster. Depending on range or the mood it's in, it may or may not fire it up. Been trying to figure out a way to wire an indicator light from the module to the top of the dash so I can look out from the house to make sure it's on. As you know wiring up these RF remotes takes some magic to figure out as the instructions are garbage.

Any suggestions?

The espar doesnít fire up? Or the RF fails to get the signal and doesnít turn on ?

If itís the RF, could easily add a 12v led to the output and run that to the dash.

If itís the espar, not sure if there is any indication that it is running.

Or buy expensive two way viper that will report if it got the signal

JFloFoto 01-20-2020 04:07 PM

Re: Espar 7 day timer is a pain to program, so I added a remote
 
Quote:

Originally Posted by cian128 (Post 842658)



If itís the RF, could easily add a 12v led to the output and run that to the dash.



Tried that, always hot.

Sent from my Pixel 3 using Tapatalk

cian128 01-20-2020 09:08 PM

Re: Espar 7 day timer is a pain to program, so I added a remote
 
Quote:

Originally Posted by JFloFoto (Post 842661)
Tried that, always hot.

Sent from my Pixel 3 using Tapatalk

very strange, connected between 87 and GND on the output relay?

that should be dead when circuit is not activated

vanski 01-26-2020 12:24 AM

Re: Espar 7 day timer is a pain to program, so I added a remote
 
Nice work in finding remote relay which will send a pulse type signal :thumbup:

Idea... it is nice to have some of the other technology available with the 7dt, especially the fault code reading available if youíve wired that up.. if you send a negative pulse signal to pin 7 on the 7dt it will activate it.


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