I want to rig up a little light that will power on when the water level gets low in a tank.
I want it to run from a battery and to light a small led or something.
If I used this sensor from amazon what else would I need to make it work ?
http://www.amazon.com/Tanks-Horizontal-Liquid-Switch-Sensor/dp/B00AKW29U2/ref=pd_sim_60_1?ie=UTF8&dpID=41YZJuidvJL&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=1MXMHPEAFZKWFY4JQWQK
If its possible I would like to use cr123 batteries to power a small led because I have so many extra of those.
I was looking for some kind of small light I could connect it to that would flash or not use much power.
Something like this fake car alarm
http://www.amazon.com/RED-Flashing-Auto-Theft-Deterrent/dp/B00LCBIJYK/ref=sr_1_1?ie=UTF8&qid=1450583833&sr=8-1&keywords=led+flashing+alarm
And then wire it in like shown in this vid
https://www.youtube.com/watch?v=CK_z_e6PU70
I cant tell if the LED in that device flashes on it own or if it has some board inside i cant see.
What kind of led light would you guys use instead of the buzzer shown in the vid.
they teach this stuff int the 4-th grade, dude. are you an 8-yo dropout?
Ya I understand the circuit.
I think I am going to get some of these LED's, the listing says they flash and blink and they need 12 volt dc
http://www.amazon.com/20pcs-Blue-Flashing-Light-Wired/dp/B00EE43ASW/ref=pd_sim_sbs_121_1?ie=UTF8&dpID=51et9oPSo9L&dpSrc=sims&preST=_AC_UL160_SR160%2C160_&refRID=0KP0F3WHKKVAABY9HV80
I will wire up a bunch of my cr123's till I get 12 volts and make the circuit.
I am guessing it will not really need all 12 volts to make them blink. Maybe 9 will do.
The fake car alarm one I showed only has two AA batteries and they are only 1.5 volts each.
those batteries are expensive. you're better off using some AAA alkalines. i've seen flashing LEDs that are 5V, and will work with 3x 1.5V cells. in fact, you can sometimes see them in stores to advertise some product. you can get a ready made gadget like the pic from Radio Shack, which includes everything you need. just solder your float switch in parallel with the on/off button.
