phase control using triac in BS2 application

Archiver

I have a question using BS2 as a phase controller, since the BS2 only have 16
pin I/O pin. no RTCC
pin, Does anyone have good idea using BS2 in
AC phase ( 120V ,60Hz) triac application ?

Baker

Archiver

Use the stamp to control the setpoint in phase control hardware. Do
the phase control in hardware, not software. The setpoint determines
where in the AC cycle the output SCR's are triggered.

You can do with a simply R2 network, an rc network and a LM339
comparator and some opto isolators.

Think about it and it maynot be such a large problem to solve.

Ron

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Original Message

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From: <baker_bai@c...>
To: <basicstamps@egroups.com>
Sent: Monday, June 19, 2000 1:27 AM
Subject: [noparse][[/noparse]basicstamps] phase control using triac in BS2 application


> I have a question using BS2 as a phase controller, since the BS2
only have 16 pin I/O pin. no RTCC
> pin, Does anyone have good idea using BS2 in
> AC phase ( 120V ,60Hz) triac application ?
>
> Baker
>
>
>
>
>
>

Archiver

>>>
Date: Mon, 19 Jun 2000 09:27:32 +0800
From: baker_bai@c...

I have a question using BS2 as a phase controller, since the BS2 only
have 16 pin I/O pin. no RTCC pin,
Does anyone have good idea using BS2 in
AC phase ( 120V ,60Hz) triac application ?
<<<

The BASIC Stamp is not fast enough to do AC phase control
directly [noparse][[/noparse]without a bunch of timing hassles...] so when
I made a four channel triac dimmer controlled by a BSI
I used 4 Velleman DC voltage controlled dimmer kits [noparse][[/noparse]3 amps
$20 from Jameco] and fed them DC derived from op amp +
capacitor integrated PWM signals from the BSI. 1 BSI pin
per dimmer. [noparse][[/noparse]There is an optoisolator on this dimmer module].

I used current drive to the opto isolators to get better
linear response as the LEDs don't conduct until there's
1.5 volts or so on them.

It has worked well but is a bit expensive to implement.

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