Add trailing alarm

[javieralmancevo]

Hi

I just discovered boilr and it is a great app. I have a suggestion. One thing I am missing is having a trailing alarm, that would work like a trailing stop. For example, the price of BTCUSD is right now $407, and you put a trailing alarm of $5. At this point the alarm would sound if the price goes under $402. Then the price moves up to $410, now the trailing alarm would sound at $405. The price goes down to $408, the trailing alarm is still at $405. The price goes up to $412 (edited), the trailing alarm now moves to $407. You get the idea. Same in the opposite direction obviously.

[dllud]

Hi @javieralmancevo

Thanks for the suggestion!

I am a bit confused about how the trailing alarm should work. Can you tell us the formula to calculate the alarm level?

The following is what I got from your $5 alarm example. I am missing the reason for the last alarm levels.

#	price	alarm	reason
1	407	402	407-5=402
2	410	405	410-5=405
3	408	405	?
4	410	407	?

[algazarra]

Trailing means the alarm updates according to price. As @javieralmancevo examplifies, the alarm would work in ranges of 5usd counting from the last high. If price goes up to 410usd, the alarm is updated to 405usd. If 410usd is crossed, a new high is set, and the alarm is updated again.

@dllud this requires both recognizing the last high and caching it

[dllud]

@algazarra Thanks for the clarification.

That explains step 3, but I'm still confused about step 4:

#	price	alarm	reason
1	407	402	high: 407 -> 407-5=402
2	410	405	high: 410 -> 410-5=405
3	408	405	high: 410 -> 410-5=405
4	410	407	high: 410 -> ?

[algazarra]

In step 4. the alarm would stay the same, 407

[dllud]

But it was at 405. Please review the table above.

[dllud]

It seems to me the example provided by @javieralmancevo is wrong it its last step (step 4). To be correct it would be:

#	price	alarm	reason
1	407	402	high: 407 -> 407-5=402
2	410	405	high: 410 -> 410-5=405
3	408	405	high: 410 -> 410-5=405
4	410	405	high: 410 -> 410-5=405

Right?

This way I got the mechanics of it. If things went on, it would look like this:

#	price	alarm	reason
5	409	405	high: 410 -> 410-5=405
6	407	405	high: 410 -> 410-5=405
7	405	405	:bell: RING! high: 410 -> 410-5=405
8	404	400	high: 405 -> 405-5=400

[javieralmancevo]

@dllud what you wrote in your last message is correct. In my first message the last example is indeed incorrect, I mistyped. I am glad you have included the suggestion to the milestone. Thanks for your great work.