Aktuellt robotsnack

[stb]

Frmodligen har AR500 ingen failsafe eftersom den r snabb. Det r funktioner som Failsafe som frdrjer signalen.

Jag har programmerat vr styrning och den bittra sanningen r att man mste ta emot ngra signaler p ungefr samma niv fr att veta att det inte bara r en tillfllig strning. Frdelen med att gra en egen failsafe / controller r att man kan bestmma hur mycket frdrjning respektive skerhet man vill ha p varje funktion samt vad man vill skall hnda. Vr robot fortstter en kort stund med konstant hastighet under tiden som den sker efter en ny stabil signal. Frst efter ngra tiondels sekunder s bromsar den kontrollerat.

[leorcc]

The AR500 only only failsafes a setting on the first channel, but unlike the other RX's from Spektrum it stops sending a signal to the other channels. So a speed controller on channel 2 and 3 for instance which doesn't get a signal will stop moving. A servo would need a separate faisafe, but RC switches, speed controllers etc will stop moving as soon as there is a signal loss.

With the AR6200 or AR6000 the speed controller never registers a signal loss so it would keep doing what it was doing. If your robot was turning at that time, it would keep on turning until signal is restored.

[swedemac]

Thanks for the info Leo, good to know. However, I will try and use the AR6200 included with the radio but use an external failsafe on every used channel. Will pick up a AR500 with my next robot build since Mithril in it's current state is not worth putting to much effort in . I'll just get it running and have a bit of fun and practice.

Will get back to you and Maddox when it's time for the next robot. Will need all the help I can get with that one .

[leorcc]

Failsafes behind the Ar6200 channels do not work. The failsafes NEVER get a false signal so they never go in failsafe mode.

[stb]

That should have been explained very clearly at the robot shops. I am disappointed.

[swedemac]

I must agree with Stefan (stb) here that a little more info about failsaves not working with 2,4 GHz (?) receivers somewhere would have saved me a lot of money and time. I can't find any info about it on Technobots and very little on Robotcombat. At least he warns about the AR6200 receiver not having failsafe on any other channel but no1.

Oh well, we learn by doing I guess . It's better to learn this way than during a fight though.

I can understand the aerial aspect of the failsafe on AR6200...you wouldn't want your plane to shut down and plumeth to earth if a loss of signal occurs .

[leorcc]

What the most AR receivers do is the standard PCM trick.

Either you can set a specific position on all the channels to be in during a signal loss (which would be good for us, only the BR6000 and AR7000 do that) or you maintain the last known position to the channel when the signal was there (which is the default for PCM) also known as the keep doing what you were doing option. In both options at no time during signal loss will there be a dirty signal to the channel so the failsafes behind the reciever never register anything wrong.

Only the throttle channel will have a failsafe preset, because that controls the gas on an airplane or helicopter and you can set that so it can cut off the engine.

The AR500 is the first (and as far as I know only) DSM2 receiver to do the FM option, let the devices behind the channel decide what to do.

What you can do (And I believe Paul Cooper does that for his Futaba 2.4 GHz machines) is to have a power cut off on the throttle channel with an rc switch and relays. As long as there is a signal, the relays stay on, power can go to the speed controllers etc, but as soon as the signal is gone the power is cut off and the robot stops.

[attachment=0:2p3e16t5]basiclayout1failsafe.jpg[/attachment:2p3e16t5]

[swedemac]

I got an answer from a RC-shop that most spektrum radios are programmable so he said I could just program the info to the receiver and then it would act as I want (stop dead when loss of signal).

Is this possible or is he just getting my hopes up? :P.

[leorcc]

If that were true we would never had to have a BR6000. It was made particularly at the request of roboteers (that is why it is called BOT Receiver) to have a programmable failsafe on all channels.

Let him demonstrate it, because it doesn't work. Only the throttle channel has a programmable failsafe, the rest stays in position. Your salesman/vendor confuses the power-up position (which is programmable) with the failsafe position.

This is from the AR6200 manual:

The AR6200 features a SmartSafe„ failsafe option. SmartSafe is ideal for most types of electric aircraft and is also recommended for most types of gas and glow-powered models. With SmartSafe, when signal is lost the throttle channel only is driven to its preset failsafe position (normally low throttle) while all other channels hold last command.

You can also read about it here:
http://www.rcgroups.com/forums/showthread.php?t=1035358
http://www.rcuniverse.com/forum/m_62921 ... tm#6292369

[Moritz]

Nu r frsta provturen med Crude inte lngt borta!
Det fattas bara ngra kablar och ett batteri innan den gr att kra.
Visserligen r det bara en test-version, men om den fungerar kan jag brja
med den riktiga roboten.

„r det frresten ngon som vet om det finns ngon lista med upptagna robotnamn?
Skulle ju vara lite pinsamt om man rkade dpa sin robot till typ Razer eller Hypnodisc...