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To: Wilf Rigter <Wilf.Rigter@...>, ''Will LeGros ' '
<wilbertone@...>, "''beam@yahoogroups.com ' '"
<beam@yahoogroups.com>
Subject: RE: [beam] Best/Most Recent PSH schematic
Date: Sun, 24 Mar 2002 15:52:28 -0800
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From: Wilf Rigter <wilf.rigter@...>
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Time for a makeover of the old PSH with a simple efficient SE requiring no
special parts. Attached is the schematic for the 1DOF Solar Power Smart
Head.
The SE circuit uses just 2 transistors and 4 resistors. It has been
optimized for a 3V solar cell and can only be used for HC logic enable. The
SE circuit needs only 3-5uA supply current which is very respectable
compared to other SEs. The PSH is the standard version 1 1DOF design with
four inverters used to drive the motor. One spare inverter has it's input
grounded to minimize supply current.
Note the special mix of enabled and alway active inverters which are so
arranged to ensure that all inputs have a DC path to +V or 0V when the
circuit is disabled. This avoids high supply current associated with
floating inputs during charging. Even if a HC240 gate is tristate disabled,
the supply current will rise to many milliamps when the input voltage is
near +V/2.
Here is a new layout drawing of a much improved Solar Power Smart Head.
It
uses a transistor only SE which is almost as good as a 1381 type and can
be
used in low light conditions. The trigger voltage is 3V and the reset
voltage is 1.9V The 74HC/AC240 chip is wired for two PSH circuits for a
head
with 2 degrees of freedom. If only 1DOF is required then the unused
inverters can be wired in parallel for use with less efficient motors.
Note
the optical bridge is switched off during charging to reduce standby
current.
wilf
-----Original Message-----
From: Will LeGros
To: beam@yahoogroups.com
Sent: 3/23/02 6:21 PM
Subject: RE: [beam] Best/Most Recent PSH schematic
Just a quick question. It appears the 74hc240's pins are facing down
and the 1381's pins are pointing up. Is that correct?
Hey everyone. I was wondering what is the best PSH version for a solar head like this one: http://www.geocities.com/SoHo/Exhibit/8281/solar_head.html I have a...
http://bicoreeos.solarbotics.net/psh.html describes the details of that version. It is PSH version1 (first and still the best) with the SE grafted on by...
... that ... grafted ... Yes, I have seen this page before, thanks for the info. Now I know the best one. But, I forgot to mention, I don't have any 1381's. ...
I have two questions. 1) I am building a SPSH from this site: http://bicoreeos.solarbotics.net/psh.html and I do not have a 6.2M, 510K or 8M resistors. Is...
Hey Will Where in Ontario are you? If your in the Toronto area there's Active surplus on Queen St. W And just a few doors down is a store Supremetronic....
I live in Chatham which is quite a ways away. Maybe I'll stop in next time I head that way. What other things do they sell? Gearmotors? Gord Mitchell...
Hey Will > ... Active has some good stuff. But not gear motors. The have pager motors for $2.50 and the rm1 motors for $2.50 the litle bitty rm1type motors are...
Here is a new layout drawing of a much improved Solar Power Smart Head. It uses a transistor only SE which is almost as good as a 1381 type and can be used in...
What are the one or two nearest values you have available? wilf ... From: Will LeGros To: beam@yahoogroups.com Sent: 3/24/02 10:21 AM Subject: RE: [beam]...
Will, London might have a few places to try, don't take my word on it. But there is a surplus store there that I have been to, a few years ago. Try the yellow...
Or I could use infinite 0 ohm resistors. What? Don’t think they exist. Check the Digi-Key catalog page 543 September - October 2001 (the current one I...
Hi guys, I have a pair of Omrons that need a new home. I can sell them to you for cheap, (email for price) or I can trade you them. If I'm going to trade them,...
Ben Micklin
kcimb@...
Mar 25, 2002 5:47 pm
They're actually resistors (Normal resistor packaging), with a direct connection between the leads. If your populating machine (Device to drop in components)...
Ahhh I see.... There goes all the humor in that! Thanks though Ori <sbarbut@...> wrote: They're actually resistors (Normal resistor packaging), with a...
... direct connection between the leads. If your populating machine (Device to drop in components) can't grab wire and position it properly, you use those,...
loves_paints
loves_paints@...
Mar 29, 2002 12:55 pm
Time for a makeover of the old PSH with a simple efficient SE requiring no special parts. Attached is the schematic for the 1DOF Solar Power Smart Head. The...
Hi Wilf! Long time no talk to! I've been out of the robot biz for a while. Unless I am mistaken, pins 12 and 16 on the schematic should be swapped. Lee Golden...
Actualy, they are in a standard resistor "package" and are marked as having a single black ring. Pick and place machines can pick and place a resistor with a...
Richard Piotter
richfiles@...
Mar 25, 2002 6:16 am
... Hey Will, A long time ago, I bought a nice resistor assortment from Tech America (now radioshack.com). It is a three drawer set that contains nearly any...
Here are some final revisions to the circuit including the spare inverter put to good use. I build and tested it with a 1F cap and it works well. Note that in...
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