As i get growled at if i discuss picaxe on this forum, send me a PM with an contact email address and i will discuss this further off forum.
If you wish to use a different type of circuit than by all means stay on this forum, as there is some very clever people here.
Pete.
As i get growled at if i discuss picaxe on this forum, send me a PM with an contact email address and i will discuss this further off forum.
If you wish to use a different type of circuit than by all means stay on this forum, as there is some very clever people here.
Pete.
Hi Pete,
I am sure other members would like to see projects done in Picaxe on this Forum, let the growlers growl...
It may be related to a sponsor(s) of this forum wanting restrictions on the discussion of competing devices.I have been asked not to discuss the picaxe on this forum and is why i often help others off forum with a project, i personally would rather keep thing on a forum so all can learn and follow in the footsteps.
All very simple if you use a micro controller, then basically and combination of logic can be applied to generate what ever pattern you want.
It can all be done using 4 inputs and 6 outputs with mosfets drivers on the outputs.
That would be inputs for brake, tail light, left turn, right turn and an output for each light left and right.
If it was me i would use a Picaxe micro as they are very simple to program and use, with good (other) forum support but not well excepted on this forum
Not to knock your response (and I would be curious to see what a Picaxe solution would be, damn the growlers!), but couldn't this pretty easily be constructed with discrete logic components? Doesn't sound too complicated, though I haven't even sketched anything on the back of an envelope yet ...
Did you have a design in mind?
One question i do have that maybe Eric or someone can help with is, there needs to be a driver between the picaxe and led lights to switch the 12v+ to the lights, and the picaxe has 5v logic out.
Normally i would switch ground and save any hassles with feed back from the higher voltage, but with in car use the ground is common to all lights and we need to switch 12v+.
I have several solutions but was wondering what others would recommend for switching 12v+ with 5v logic.
I dont know the current requirements at present per light but would expect it to be no more than 1 amp.
Pete.
Thanks Eric,
I was thinking of using a BD681 darlington transistor as they are rated to 4 amp, lamp in rush surge should not be a problem as it is led lights used.
For some reason mosfets and me dont have a good relationship and when used for frequency switching they make better heaters than switches, (i do kinda know why) but in this case the amps should be low and the frequency is slow, so a mosfet should not suffer too bad.
As for the smd device i think it will be beyond the OP to work with that, so will look to through hole components.
I will put together a schematic when time permits so all can check it for bugs.
Pete.
Hi Eric,
I really dont know how the lights are set up and well expect they have a common earth to chassi.
If this is correct than it will be required to switch 12v+.
If this is the case, a high side switch will be required, [ as per the FET dwg]
I was thinking collector to 12v+, emitter to led light, and a resistor between base and picaxe.
The max voltage across the LED would be 5V-Vbe drop, if a darlington was used the Vbe would be ~ 1.4V, si if I follow your description correctly, all you would get across the led would be 3.6V
I also dont know how the leds are configured in each light but would expect only a supply of around 2 volts through the light, so i would expect the transistor to switch on fully as the base voltage (5v) is higher than the load voltage required.
As its an emitter follower the BD transistor would not saturate.
Correct me if i am thinking wrong here.
Pete.
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