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Footer pulse getting larger as battery get drained
#1
What I noticed without changing anything but the battery was that the pulses becomes longer/larger as the battery gives less power.

Pulse train comes from LINK

battery FULL/new battery:
Code:
297 891  297 891  297 891  297 891  297 891  297 891  297 891  891  297 297 891  891  297 297 891  891  297 297 891  891  297 297 891  891  297 297 891  297 891  297 891  297 891  297 891  297 891  297 891  297 891  297 10098

Battery almost drained. PIR sensor showing blue led.
Code:
355 1065 355 1065 355 1065 355 1065 355 1065 355 1065 355 1065 1065 355 355 1065 1065 355 355 1065 1065 355 355 1065 1065 355 355 1065 1065 355 355 1065 355 1065 355 1065 355 1065 355 1065 355 1065 355 1065 355 1065 355 12070

Does anyone know if this is common with 433mhz on battery running hardware?

Protocol idea?
Is it a idea to exploit this so in case the battery is almost drained, so the specific protocol can warn the user? For example, showing the footer going from 10000 to 12000 meaing battery almost empty. OR settings a configurable treshold when a footer goes above a specific value?
 
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#2
I know that it is an old posting, and I came across it today, as i am currently working on improvements for the pulse length calculation.

The reason for this behaviour is by design of most transmitter chipsets. When you check the datasheets for the encoders they typically use resistors to vary the clock frequency, teh frequency also differs with the supply voltage.
 
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