Re: [SeattleRobotics] OOPic -- I2C -- PCF8574
- I understand you have one limiting resistor feeding the common anode of the
7-seg. This will result in difference in brightness depending how many
segments you light. Rather remove the single resistor to the CA, and place a
separate 220R in series with each LED cathode and the PCF8574 pin. You then
get the same amount of current sink through each LED regardless how many are
lit the same time.
Your previous problems getting the LED's to glow is because the PCF8574 can
sink something like 25mA per IO pin, but only sources 1mA or so, thus you
have to do a sink configuration to get enough current through the LED.
Your confusion about the "0" switching on the LED segment is because of just
this same thing. In order to sink current "into" the pin, you have to make
it low, or "0".
- I'd like to know if anyone can help me with an evaluation on Protel 99 SE.
I'm a bit leery of just trusting the sales rep, and I have to make a snap
decision on new schematic and PCB tools.
Am I going to be able to run this on both my main system and my portable?
My main system is an Athlon 2000 with a ton of ram, running XP pro.
My portable is a Crusoe 700 with 128M, running ME. It would be difficult,
but possible, to change the OS.
I have not been able to run the protel demo on the portable.
Also, I need to know how well it integrates to Pro-E in the sense that our
mechanical and plastics guys have to give me oddly shaped boards, with
physical restrictions, and I need Protel to express those limitations to me
in some rational and easy to deal with manner.
Finally, any comments on ease of use, problems, gotchas etc would be most
What I'm using at the moment is Orcad 386 (The dos version)
I'm in Vancouver at the moment, and will be coming through seattle on
friday on my way home.
- Well, requirements are clarifying, and it's looking like I'm going to orcad
Has anyone used this with pro-engineer to pass mechanicals back and forth?
- You could ask this on the Homebrew_PCBs list. Despite the name,
there are some professionals there. We've got over 200 members.
--- David VanHorn <dvanhorn@...> wrote:
> Well, requirements are clarifying, and it's looking like I'm
> going to orcad
> Has anyone used this with pro-engineer to pass mechanicals back
> and forth?
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I am playing with the OOPIC and the PCF 8574 on the MarkIII sensor
board and I need some seed code to help point me in the right direction
Has anyone got any code segments I could begin with please to help out.
- I finally cleaned up my motor test code. It's different from what I sent
you on the OOPic list, but it's a lot easier to read now. I've uploaded
it to the Files area of the Mark III list in the OOPic example code area.
There's a folder in there now for sensor board code, and the motor code's
in there, too.
I'm going to go ahead and add digital I/O stuff for the Handyboard I/O
block and for the buzzer, but there's not really much to using them...
it's normal OOPic I/O port code.
On Wed, 5 Jul 2006, Mark Pepper wrote:
> I am playing with the OOPIC and the PCF 8574 on the MarkIII sensor
> board and I need some seed code to help point me in the right direction
> Has anyone got any code segments I could begin with please to help out.
> Visit the SRS Website at http://www.seattlerobotics.org
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