Hi everyone,
First of all, this is a great forum - I've picked up a lot of handy bits of info just sitting in the background. But I'm having trouble with this idea:
What I'm trying to make is a non-contact voltage detector. It simply just detects the presence of voltage or not - no need for level indication or anything special like that. Working with 230v in Aus (50Hz). Fluke and heaps of other manufacturers make them in a pencil sort of thing, but I'm looking to integrate this into my project, and this seems the safest way to do it.
I have thought of other ways to do it, such as
- a plug in 230v coil relay that closes signal contacts (but I can't always get access to the end of the cable, and if its hard-wired to an appliance then I can't do anything with that anyway)
- inductive current sensor (but i need to detect voltage, not current because there may not always be a load drawing current)
So far I have tried a floating input into a PIC (16F628A), a hall effect sensor into the PIC, and a (dodgy) inductive coil sort of thing. These have SORT OF worked, but nothing reliable enough. This will be used for AN INDICATION only - so I'm looking for something fairly reliable, nothing that you'd bet your life on though.
Has anyone worked on something like this, or got some good information, because from what I have seen, this 'voltage-detection' seems somewhat elusive.
Thanks for your time,
Tom.
First of all, this is a great forum - I've picked up a lot of handy bits of info just sitting in the background. But I'm having trouble with this idea:
What I'm trying to make is a non-contact voltage detector. It simply just detects the presence of voltage or not - no need for level indication or anything special like that. Working with 230v in Aus (50Hz). Fluke and heaps of other manufacturers make them in a pencil sort of thing, but I'm looking to integrate this into my project, and this seems the safest way to do it.
I have thought of other ways to do it, such as
- a plug in 230v coil relay that closes signal contacts (but I can't always get access to the end of the cable, and if its hard-wired to an appliance then I can't do anything with that anyway)
- inductive current sensor (but i need to detect voltage, not current because there may not always be a load drawing current)
So far I have tried a floating input into a PIC (16F628A), a hall effect sensor into the PIC, and a (dodgy) inductive coil sort of thing. These have SORT OF worked, but nothing reliable enough. This will be used for AN INDICATION only - so I'm looking for something fairly reliable, nothing that you'd bet your life on though.
Has anyone worked on something like this, or got some good information, because from what I have seen, this 'voltage-detection' seems somewhat elusive.
Thanks for your time,
Tom.