Webasto timer, original or counterfeit?

hello,
Does anyone know if it's possible to replace the original Webasto timer with a standard timer?
I measured the voltage at the Webasto switch output, and it's around 8.3 volts, not 12 volts.
Before I do something wrong, I'll ask. Interestingly, no one is reporting about a replacement for the timer either.
It's a Thermo Top Z/C diesel model, manufactured in 2001.
Best regards.
electricity

If it's the standard Webasto timer with the 3-pin connector, you can connect any standard timer to it.

The device has +12V, ground, and a switching output. You simply need to apply 12V to the latter, and the heating system will start. In my Thermo Top, I believe it's the black wire.
I connected a Conrad remote control in parallel to it in this way.
The 12V must be continuously supplied.

What's wrong with the original watch?

CU Gremlin.

Thank you for the response.
'This is a desire for more switching times, and possibly connecting a wireless remote control at the same time. I think I might try to repurpose something like a phone flasher for this. The advantage would be that no phone would need to be permanently connected.'
Best regards.

It also flashes even when the phone is performing its scheduled check-in or hourly verification.

'Aren't three shift times enough for you?'

CU Gremlin.

Hi,

I also connected something similar in parallel to the original clock (a mobile phone for remote control). I would like to add something to that:

According to Webasto, any additional switching device must have a control lamp that indicates when the auxiliary heater is running (a lit switch would suffice). This is a regulation for vehicles in the Federal Republic of Germany. (I have no idea if it's correct.)

2. The original clock has a very high-impedance output. Therefore, the output of the additional device should, if necessary, have a diode connected to it. The additional device should also have an indicator light, as in item 1 (e.g., ...). (LED) cannot be driven by the original timer circuit.

PS: I would also advise against using a phone flasher, otherwise you might get a call in the car and the STH (presumably a security system or alarm) will be triggered...
I would buy a cheap mobile phone with a vibration alarm (e.g., Sagem MC922), connect the vibration alarm to a monostable multivibrator (~30-60 minutes) using an optocoupler, and then connect the monostable multivibrator to the described indicator light and the 'STH' (whatever that is). I would also add a reset button for the monostable multivibrator, in case you want to turn off the 'STH' prematurely. And a car charger for your phone, so your phone battery stays charged...

You get a remote control with nationwide range for less money than a conventional remote control with a maximum range of 100 meters (which is useful if the company premises are huge and the car is far away). Furthermore, the call on the STH phone is also free because the phone doesn't need to be picked up. The only downside is that you have to recharge the prepaid card every 1.25 years.

I can gladly upload more photos if needed.

Regards,
Private.

Hello,

I'm curious about the exact way you implemented this. From what I can gather, it seems like a monostable multivibrator is configured to switch from GND to +V when a certain pulse is applied.

Could this impulse be a GND signal?

The Monflop itself activates the + signal for a certain period, which is likely determined by resistors (although I'm not entirely sure). How high must one choose such a resistor to, for example, operate the STH for 20 minutes?

Which monostable multivibrator did you use? NE555?

Do you perhaps have a schematic diagram for such a circuit?

Unfortunately, I don't understand how the optocouplers react to the phone, could you perhaps explain it?

Is your phone constantly plugged into the car charger? Does it receive a constant charging current? If so, wouldn't it be the same thing to just bypass the battery and connect the phone directly to the car's power supply? Or am I mistaken?

I think those were all the questions for now.

Best regards.

Hi,
The mobile solution is brilliant, but it also has its drawbacks:

I've tapped into the vibration motor of a Siemens C25 for the FB/timer solution. It actually works quite well, but the vibrator is automatically disabled when the charging adapter is plugged in. Charging is only possible if the heating is already running, or at another time when the phone should not be in standby mode.

At extremely low temperatures, the phone often malfunctions and shuts down.

The monoflop isn't that trivial either; using a 555 timer to achieve approximately 30 minutes is difficult to design properly (due to the R-C time constant).

I'm using a small controller and relays to implement the timer function. When the heating is turned on, the phone is then charged for 1 hour via another output.

Due to spam calls and unwanted SMS messages from providers, the controller only activates on the second 'ring.'

Best regards,

I tapped into the vibration motor of a Siemens C25 for the FB/timer solution. It actually works quite well, but when the charging adapter is plugged in, the vibrator is automatically disabled.
Therefore, and for cost reasons, I had referred to the Sagems.

When temperatures drop significantly, the mobile phone often fails and shuts down.
So far, no problems regarding this.

The monoflop isn't that trivial either. A 555 timer solution is difficult to dimension properly for around 30 minutes (R-C time constant). I implement the timer function using a small controller and relays. The phone is then charged for 1 hour via another output when the heating is turned on.
Well, I think a controller is a bit excessive in this case; my monoflop circuit only contains Rs, Cs, a diode (D), and two transistors, in addition to an optocoupler. Also, it doesn't matter to me if the STH switches off a minute earlier or later in unfavorable situations. I find that tolerable for a runtime of approximately 45 minutes.

Regards,
Private.

hello,
We bought an original hands-free device from Siemens on eBay for 10€.
There's now an Atmel microcontroller inside.
It's attached to an S25.
Due to the 'red phonebook,' only calls from numbers listed in the 'red phonebook' will be accepted.
By using a small configuration trick on the S25, all signals are effectively ignored, except for calls from numbers listed in the red phonebook.
SMS or other messaging services are not working.
so that you don't have to open the S25.
Let's record the speaker signal that is present on the connector for the hands-free system.
The signal is small, but with the internal AD converter in the Atmel microcontroller, it's possible to 'analyze' the ringing. To prevent it from reacting to interference pulses, the program includes a software-based integration over a specific time (100ms).
To enable the speaker signal to be transmitted over the line, PIN8 must be connected to ground.
That's what the ATM does.
The hands-free device also has a charger built in, which we can use.
It only charges while the ignition is on. Based on experience, this is sufficient to keep the battery almost fully charged.
Unfortunately, the S25 only supports one function at a time: either battery charging (pin 8 is not connected) or hands-free calling (pin 8 is connected to ground).
When the ignition is turned on, the Atmel microcontroller handles the switch from FSP (Field Stop Power) to charging mode. This is because a few seconds must pass between disabling FSP and enabling charging; otherwise, the phone's charging status may not be recognized correctly.
It also has the advantage that you can't turn it on via your phone when the ignition is on. It would be pointless anyway if you were already in the car.
The first version used DIP switches, allowing the time to be programmed in increments of 1 to 128 minutes. Unfortunately, it had a disadvantage: there was no function check and no monitoring of the remaining runtime.
The original clock, which was also connected via the Atmel microcontroller, takes precedence.
To turn off the instant heating function that was activated via the mobile app before the timer runs out, you only need to press the 'instant heating' button and then turn it off again.

[img][/img]

it basically worked well for a few days .
until the new version came out

Since a functional check is beneficial, and the remaining lifespan is also of interest.
The idea came to mind that a display was needed.
But it's a shame to use a display when you already have one.
idea
1. Remove the Webasto clock and use the additional display for all functions.
2. Take the Webasto clock and display all information on it.

thought, done.
'I opened the clock, connected the buttons (+, -, heat) with 3 wires, and also connected them to the microcontroller (Atmel) via an RCR (debouncing and short-circuit protection) circuit.'
the result:
If you call, the system will 'press' the 'heating' button and magically turn on the heating.
'And so that you can also adjust the time, after pressing the 'heat' button, press the '+' or '-' button until the desired time is reached.'
Without feedback, meaning that for 25 minutes, the device presses the '-' button 5 times, and for 40 minutes, it presses the '+' button 10 times.
To prevent any false readings, debouncing has been implemented to ensure the sensor doesn't miss any data.
and as if by magic, the desired time is set when you make the call .

And since everything is so neatly integrated and hidden, it's not very convenient to adjust the timing using the dip switches, so there's another great feature.

While the 'heating' button is pressed on the clock and a call is being made simultaneously (which only works if you're using a mobile phone while in the car), the thermostat enters 'programming mode.'
Now, you can use the '+' or '-' buttons to adjust the duration.
When you release the 'heat' button, the 30-minute timer appears. If you then set it to 35, ...
Then, the microcontroller recognizes that the '+' button has been pressed 5 times and stores this information for the configured time when the device is turned on via the mobile phone.
If no button is pressed for longer than 10 seconds, the programming mode will be deactivated and the device will switch to normal operation.
If you call now, the time will magically be reset to 35 minutes.
It's working perfectly so far.
Power-on check and remaining runtime display via the webasto control unit.
It doesn't even have the original Webasto remote control (or at least, I think it doesn't).
It is also possible to 're-schedule' the heating. If you call while the heating is already running, whether it's controlled by a timer or a mobile app, the pre-programmed time will be set.
It's simple: when the clock is on (and connected to the ATmega microcontroller), the ATmega briefly turns the clock off and then back on, allowing it to reset the clock to the defined 30-minute interval and ensuring the time is correctly set by the ATmega.

It works because, during the program's execution, the microcontroller can switch the pins between input and output modes as needed.

'It's all in the original FSP housing, so it comes with nice connectors for wiring.'
The quiescent current with the ignition off is approximately 5 to 8 mA, which is a very low and acceptable value.

[img]

[/img][img]


The clock has now been moved to a better location, so please don't complain. [/img]

[img]

greetings[/img]http://pics.m-eit.de/webasto/handyFB1.JPG{MARKER}http://pics.m-eit.de/webasto/handyFB2.JPG{MARKER}http://pics.m-eit.de/webasto/handyFB3.JPG{MARKER}http://pics.m-eit.de/webasto/handyFB4.JPG{MARKER}

'Wow, that sounds absolutely amazing what you've put together. Hats off to you.'

Can you give me more information about the ATmega microcontroller and where you connected the wires? I'm especially interested in how you connected it to the phone so that it behaves as expected.

Sure, I'd be happy to help. Please provide the text you would like me to translate from German to English.

greetings

You can also send it by email; just send everything you have .

blaubaer_77(at)gmx.net

Yes, the manufacturers might soon be going out of business! I think the execution of the idea is very good.

I'm going to add something else now .

my TP5 actually shows me how cold (or warm) it is inside the car

Okay, so I have two heaters: one is a Webasto heater with a Conrad FFB expansion, and the other is a TP5 (Eberspächer). I've also never had the need to turn on my heater at home from Munich.

But I respect your crafts; they remind me of the good old days...

Sure, here is the translation of the text from German to English:

'Cu Gremlin'

Hi,

...and when summer comes, there will probably be further refinements to the whole story.
Then, the Atmel microcontroller will decide, based on the interior temperature of the vehicle and possibly other criteria, whether to activate the heating system or simply ventilate.

Let's see what else we can come up with .

Best regards, Andy.