Intermittent car windscreen wiper control

I have a Toyota Corrola LX which does not come standard with an Intermittent car windscreen wiper control, which I find annoying, especially as I live in Auckland, New Zealand, where it can rain a lot. So I decided to build one.

A bit of net research and I came up with this article http://electromotiveforces.blogspot.com/2011/06/variable-intermittent-wiper-control.html, thanks Edwardson. I also found this site for 555 timers very useful http://www.doctronics.co.uk/555.htm#more_astables.

The circuit I used is shown below.

I then used VeeCAD to create the strip board layout you can see below, the VeeCAD & TinyCad files are included on this page. I decided to have all external wires removable and so put 2 connectors on the circuit board. One has the wires which go to the wiper controls which also provide power to the circuit. I used a multimeter on the wiper control switch/stick and identified the that are connected when the wiper stalk is lifted for a single pass of the wipers, these 2 wires are connected to the relay outputs, the other wires are connected to the ignition & ground to provide power to the circuit.

The other connector has the wires that goes to the controls which are mounted on a popout on the console that looks like it should be used. There is a switch, an LED to show the system is operational and the potentiometer which controls the delay.

Here are pictures of the final circuit board and about to be installed