Does anyone know where you can get something like this http://store.qkits.com/moreinfo.cfm/FK915 My battery went flat and I only knew when the alarm started squeling :( I'm looking for something that will alert me when the voltage drops below a set figure.

 

Cheers

 

Vijay

I'd be interested in this 2 bud :)

 

Anyone ???

fit a volt gauge :D

bump

There seem to be a number of circuit diags on the net for this and all are fairly simple... I could have a go a knocking one up if you like? I'm sure there are a few electonics gurus on here who could design one... Happy to have a go for you though, components sumtotal will be a couple of quid so I'll probably give it a go anyhow!

or you could just try below I guess... lol

 

http://www.cbcdesign.co.uk/alarms/lvld.html

That'd be brilliant. Would you be able to make one that switches a relay?

 

Let us know how you've got on once you've made it up :)

 

Vijay

I can't see that making it switch a relay can be that hard...What are you planning to drive with the relay output?

You will need it to only alert you when the voltage drops for a certain amount of time.. 5secs + otherwise it will go off everytime you start the car as the voltage can fluncuate right down to about 6v when cranking,

Well I might add a pager system to my car/alarm as I didn'tn't hear my alarm go off the other night which worries me (so will have the pager on the bedside table). So I was thinking of maybe the low voltage alarm triggering one of the pager sensors.

 

Vijay

The circuit I'm looking at is tunable i.e. you can set it to go off between 9-12 volts, I will point out at this point that I am not an electronics guru but can follow a diagram so I'm giving it a bash for interests sake just so we're not all under any misunderstanding that I'm going to create some amazing circuit that and cuts alarms/immobilisers in out etc.

any how back to the point... I am also thinking that I will need to be able to switch the circuit in and out so that the normal running volts don't fry it as most of the componenets max run voltage is 12v... I don't want to go down the route of useing a seperate power source as this could potentially cause an issue if that runs out so the idea is that it will just look at a feed of the battery and probably switch that in and out via the ignition switch and a realay maybe...

Any other Ideas gratefully received?

I am also thinking that I will need to be able to switch the circuit in and out so that the normal running volts don't fry it as most of the componenets max run voltage is 12v...

 

This is no problem, all you need is a voltage regulator like 7812. It will cut out all the high voltages (up to a point) and will protect the circuit.

True, I could do, not sure which is the better option though, switch the circuit out (as it isn't needed anyhow) or just regulate the input...

 

What do you guys reckon is the way to go?