Home made speedos

hello,
anybody know how to make cheap speedos from about £5-£20, suitable for 12v wind screen wiper motors
jacob

You can make a simple one using servos and micro switches. There is a guide here-
http://ukrobotics.com/index2.htmhttp://ukrobotics.com/index2.htm

ok, i did SPDT relays and four micro switches, where can i get these?
Jacob

You can get them from maplin electronics-
http://www.maplin.co.uk/Search.aspx?Criteria=spdt&doy=14m5http://www.maplin.co.uk/Search.aspx?...=spdt&doy=14m5
http://www.maplin.co.uk/Search.aspx?doy=14m5&source=15&criteria=microswitc hhttp://www.maplin.co.uk/Search.aspx?...ia=microswitch

Or Technobots:
http://www.technobots.co.uk/index.html?target=dept_512.html&lang=en-gbhttp://www.technobots.co.uk/index.ht...tml&lang=en-gb
http://www.technobots.co.uk/index.html?target=dept_31.html&lang=en-gbhttp://www.technobots.co.uk/index.ht...tml&lang=en-gb

If you only intend to use windscreen wiper motors you can get away with just these microswitches.

Those arent spdt relays though theyre spco and spno relays. but im not sure it matters

SPDT: Single Pole Double Throw
SPCO: Single Pole Change Over

Basically they are the same thing, 5 pins, 2 for the coil, a common, normally open and normally closed.

SPNO: Single Pole Normally Open.

This has 4 pins, 2 for coil, a common and a normally open.