jseyfert3 wrote:I could make such a controller for about $4 in parts, solid state, no relays to wear out. All it would take is a tiny microcontroller, a transistor, a couple diodes and resistors, solder it up and coat in epoxy. You would need to input the left and right stop/turn wires and ground, and it would output +12 V for the high mount brake light.
Since I plan on making a purchase from Digikey soon, I could throw in a couple extra parts easily if anyone was interested. I plan to have my controller done in a few weeks but cannot guarantee any other controllers would be worked on until that point. (I have a deadline to get my trailer done and will be busy doing that)
Was anyone interested in this? I actually drew up a schematic and initial cost research on Digikey. I'm making my own order from Digikey before the end of the weekend, so before I make my order I can throw in parts to make some of these for other people without adding any shipping charges if I know about it before I place my order.
I would make and sell these for the parts cost and shipping (to you) for TnTTT members. The parts cost $5.04 right now, unless I missed a price and I can find something cheaper. Most parts also get cheaper after a certain amount of the same type are ordered (usually 10 pieces, and again at 25). Perfboard was just an estimate at $0.25, I'd just cut a small chunk off what I have. The circuit would only be a couple square inches or so, less then an inch high, with short wires coming out that you hook up to your trailer wires. I'd solder it up and send it in a padded envelope so it would cost just a couple bucks to ship. For those that may see this and want to build it themselves, please note that circuit will not work unless the ATtiny85 is programmed.
This circuit would lose about 1/2 volt for the power going to the stop light, should not be a noticeable difference in brightness from the minor voltage drop.
<EDIT> For price clarity.
It is just what I needed. 
Danny
