bizarre broblem i cant solve...

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recently acquired reed switch! tried make simple relay it

so wrapped reed switch 0.3mm width wire. when connect wire battery. works fine. tried 1.5 v aaa battery , small button battery. both worked

however when connect reed relay made arduino doesnt work...

so thought power problem. button cell provided 1.4v 45ma

i guessing reed switch requires less 20ma operate

arduino provides 5v 65ma. not lack of power thats causing problem.

i used blink program on pin 13. when connect - , + of electomagnet wrapped around reed switch, pin 13 , gnd. led on pin 13 stops turning on. , reed switch doesnt operate.

is there missing not seeing...?

your gratly appreciated!!

do have multimeter measure resistance of coil ? mean ohms dc current.


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