C125 Headlight Flash

[fdv99]

I feel like this should be possible, but I am struggling to figure it out right now. I have a C125 in a car, but no PDM. I would like to use one of the outputs to trigger a relay or interrupt the headlights for a flash/warning to other drivers in an upcoming 24 hour race. I tried with a user condition, but havent been able to figure that out yet. My goal is to press a button I already have wired to the C125, and flash the headlights about 4 times. I feel like the button should trigger a condition, and that condition trigger the output 4 times every 0.5 seconds for a short time, but I am just having trouble implementing it. Any ideas are appreciated.

[Anthony]

You should be able to use combination of a timer and user condition.
Try the below.

Timer Settings
Start timer = Your Button
Sequence = Count Up
Limit = 4.0s
Enable Start setting = 0s

User Condition
Type = Momentary
Activate Conditions
1. Timer 1 >=0.5s and Timer 1 <= 1s
2. Timer 1 >=1.5s and Timer 1 <= 2s
3. Timer 1 >=2.5s and Timer 1 <= 3s
4. Timer 1 >=3.5s and Timer 1 <= 4s

Output Channel = Your Headlight output.

This should flash your lights 4 times for half a second each time.
You can adjust the flash times as needed.

Let us know how it goes.

[fdv99]

Thank you, Anthony.

That makes sense and I will give that a try.

[fdv99]

I have finally got around to testing this, and not getting very far. The logic is working, the button activates the timer and the output bit comes on when the timer hits the correct conditions, but the relay is not triggering. Should the motec output be connected to ground or positive for trigger?

The user manual says the output type is Open Collector(drives to ground) with weak pull-up (10k) to battery possitive. I am new to this so trying to figure out what I need to make this work.

[David Ferguson]

The MoTeC will provide the ground. So you need to connect one side of your relay trigger to 12V, and the other side to the Aux Output. Now when it activates low, the relay will be activated -- hopefully that turns on your lights.