Relays

Post by **BeligerAnt** » Fri Jun 24, 2005 6:55 pm

The receiver pack output on the charger is designed to charge 4.8V NiMH/NiCd packs. Just plug it in and away you go!

If you were to use a 6V NiMH/NiCd pack (5 * 1.2V), you would need a different charger. The transmitter output of a standard charger would work with some care.

See the topic "Charging batteries" in this section for more info...

Adam Hargreaves · Post by **Adam Hargreaves** » Sat Jun 25, 2005 9:04 am

Thanks. I'll be making some non-rechargable packs as backup, and probably two rechargeable ones. The non-rechargable ones will be 6V, and the rechargable ones will be 4.8V. Think I know what I'm doing now... here's hoping I don't dear anything,,,

Adam Hargreaves · Post by **Adam Hargreaves** » Wed Aug 24, 2005 8:02 pm

To change the topic totally (I've edited the title as well):

Is it possible to power a relay from a reciever? and if so, how?

Andrew_Hibberd · Post by **Andrew_Hibberd** » Thu Aug 25, 2005 4:56 pm

The easyist way is to use a servo which presses a micro switch to the realy, other that that i don't think so

Rhys · Post by **Rhys** » Thu Aug 25, 2005 5:35 pm

I'd say the easiest and best way is to use one of these.

http://www.electronize.co.uk/switchers.htm

Get a 2 channel one, that'll do two relays for you. Plus they failsafe, so it's a lot better and safer to get one of these if you're going to enter your robot into competitions. Plus they work our cheaper in the long run. By the time you add up 2 switches, a servo and a failsafe, these are the way to go. Plus if you should ever want to upgrade to bigger motors, just chuck in some bigger relays, and it'll work.

Remote-Controlled Dave · Thu Aug 25, 2005 10:18 pm

Non-tech version please Rhys: Do relays plug into that box, and the box plugs into the reciever then?
And then the relays are the switch in the motor/battery circuit?

Rhys · Post by **Rhys** » Thu Aug 25, 2005 10:29 pm

Yeah, thats pretty much it. you have two relays plug into this box. And you plug the box into your reciever. When your transmitter stick is central, both the relays are closed, and no power goes to the motor. When the stick is forward, one relay will open, and the motor will spin one way. When you move the stick back, this relay will close, and the other will open, making the motor spin the opposite way.

Much easier, and more reliable than using a servo and microswitches. Plus it failsafes. But still worth saving for a proper speedo if you can get it (if you're using drill motors that is, WW motors will be fine using this)

Freeman37 · Post by **Freeman37** » Fri Aug 26, 2005 12:08 pm

Servomotors will not turn has their speed max!

Remote-Controlled Dave · Fri Aug 26, 2005 3:58 pm

Think I'd need a simple circuit diagram if I was gunna seriously think about building a feather. Or look at someone elses bot with the system installed at least.

Rhys · Post by **Rhys** » Mon Aug 29, 2005 10:58 pm

I'll try and knock something together for RRC, using that electronize switcher if I can find it. If not I'll show you my speedos which work on the same principal.

It's really not half as complicated as it sounds, its just difficult to explain without showing you.