piezo swith problem

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stevetto
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piezo swith problem

Hi,

I’m working on a custom canister dive light and I have an odd issue.
I use Cree XHP 70 6v, piezotg from taskled, LD3 driver and 2s5p 18650 battery.

1. I connected the led (XHP 70 6V) and the piezo latch circuit directly to the battery (2s5p lion) without the led driver. The measured current
was around 6A. I could switch ON/OFF the light by pressing the piezo button without any problem.

2. I connected the led to the battery with the led driver and without the piezo latch circuit. I could “switch” ON/OFF and change modes by breaking and reset
the connection between the driver and the battery.

3. If the driver and the piezo latch are togethet in the circuit I can switch ON/OFF only at lower modes. If the led runs in 100% mode it is not possible to switch OFF. It also does not matter if there are other modes in the group or 100% is a single mode in a group, the phenomena is the same.

Has anyone experienced similar things with piezo switches?

Lightbringer
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Is this dry, or underwater? There was a thread on diving lights where people reported glitches when underwater. Basically, saltwater was making an unintentional connection, or something like that.

Try http://budgetlightforum.com/node/52132 as a starting point.

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sedstar
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i know of some various piezo components from electronics.

i naturally know what a switch is.

of all the many and varied types of switches? i cant recall ever running across a piezo switch? but it dopesnt shock me, there are as many different types of switches, as there are blades of grass, i sometimes think, from being exposed to basic electronics.

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stevetto
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It is dry.

I replaced the piezo button by a simple momentary action switch.
Same problem, still can not bee switched off at high mode.

Lightbringer
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Hmm, that’s a stumper. Unless the higher voltage and higher current just latches it on or something.

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stevetto
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Thank you for the suggestions, finally I could solve the problem and the dive light is ready to use.