SV: SSRs, relays, speed controls

[Björn Wallentinus <bjorn.wallentinus-at-abc.se>]

Don't know if this will help you but there is code for the 876 on this page
http://www.bobblick.com/techref/projects/sv2hb/sv2hb.html

Regards Björn Wallentinus
Stockholm, Sweden

> -----Ursprungligt meddelande-----
> Från: tanks-admin-at-rctankcombat.com
> [mailto:tanks-admin-at-rctankcombat.com]För flier
> Skickat: den 4 mars 2004 02:43
> Till: tanks-at-rctankcombat.com; tanks-at-rctankcombat.com
> Ämne: Re: SSRs, relays, speed controls
>
>
> Ah ha!  Great.  I have six of the D1D40 Crydom SSRs
> on the way but was trying to figure a cheaper
> solution since those things actually sell for 50$ or
> more each.  Using two makes the controller more
> reasonable if someone had to buy the relays
> wholesale.  Plus, I'll have relays on hand for THREE
> tanks now  ;^)
>
> Hey, sign me up for some code when you can.  I
> already have some '876s on the way.  I think I'm
> going to try some of those cheap 40A 12v spdt auto
> security relays first so the PCB won't be necessary
> yet.  At less than $2 a pop I can see how they work
> and go the other route if they crap out.
>
> --- Original Message ---
> From: Joe Sommer <anvilus9-at-adelphia.net>
> To: tanks-at-rctankcombat.com
> Subject: Re: SSRs, relays, speed controls
>
> >
> >Ted,
> >
> >At 05:09 PM 3/3/2004 -0500, you wrote:
> >>To keep costs down (given that the applicable
> >>ucontroller programming would have to be done),
> >>couldn't one implement full two motor reversable
> >>speed control using only two SSRs and four regular
> >>SPDT relays?  Use the SSRs to provide the high
> >>current PWM and the SPDT relays to do the H-bridge
> >>switching?  Specifically, use a PIC 16F876 to mix 4
> >>outputs driving the relay switching and the two PWM
> >>modules driving the SSRs...
> >
> >Preliminary coding for this is done except for
> >exact pin assignments.  I already merged
> >the code for my full bridge SSR with the code for
> >Steve Tyng's relay driver board.  The code fits
> easily
> >in the 876.
> >
> >The board will essentially look like the Dual Motor
> Relay
> >Mixer shown at   www.anvilus.com  but will require a
> little
> >more PCB area for the 876 versus the 628 CPU, and
> >for extra connecters.
> >
> >7 or 8 position power connecter
> >left B+, left B-, left forward, left reverse
> >right B+, right B-, right forward, right reverse
> >(motors can share the same B-)
> >
> >3 or 4 position TTL connecter for PWM output
> >left PWM, left GND
> >right PWM, right GND
> >(outputs can share same GND connecter)
> >
> >2 position connecter for 12 VDC relay coil power
> >
> >Each motor will require its own B+ connection.
> >If you simply wish to use full speed
> forward/off/reverse,
> >you will connect the battery directly to the B+.
> >If you wish to use PWM, you will connect the
> >battery to the top side of the SSR and connect
> >the low side of the SSR to B+.
> >
> >I can send a draft of the PCB layout if you wish.
> >It has four onboard SPDT relays.
> >
> >Joe
> >
> >
> >
> >**********************************************
> >Joe Sommer
> >2378 Nantucket Circle, State College, PA 16803
> >814.234.4773     anvilus9-at-adelphia.net
> >http://www.anvilus.com
> >
>