Re: I2C bus for expansion
2006-03-30 by drmabuce
Hi John ... wrote: ise given those conditions ... timeout ... misbehaving ... well then, i m glad i hedged my semantic position with the the
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RE: [ComputerVoltageSources] Re: I2C bus for expansion
2006-03-30 by John Loffink
... Uh, not really. SMBus is an enhancement to I2C developed by Intel that fixes several deficiencies with I2C bus, such as adding a watchdog timeout to any
RE: [ComputerVoltageSources] Re: I2C bus for expansion
2006-03-30 by John Loffink
... I d just leave it on the CVS PCB. Add the I2C connections behind the panels for adding functions and leave front panels for MIDI, serial port and analog
Re: I2C bus for expansion
2006-03-29 by Grant Richter
Thank you.
Re: I2C bus for expansion
2006-03-29 by djbrow54
... Rev 1.0C 2/29/2004
Re: I2C bus for expansion
2006-03-29 by Grant Richter
... I have a schematic labeled Rev. 2b showing them going to ground. If you have a chance, could you check the corrected Rev. number? Thank you.
Re: I2C bus for expansion
2006-03-29 by djbrow54
... I am using the I2C pins on the PSIM. However, the I2COut command for the AtomPro24 does not use the H8 hardware. BasicMicro did a software implementation
Re: I2C bus for expansion
2006-03-29 by Grant Richter
A few questions, if I may. 1. Are you using the hardware I2C pins on the PSIM? 2. The PSIM I2C port has the pullup resistors going to ground instead of +5v,
scope envy
2006-03-29 by drmabuce
Hi Dave ... all i can say is .... oooooooooooooo ahhhhhhhhhhhhhhhh 80 =) -doc
retro mega
2006-03-29 by drmabuce
... LOL! hey man! you stole my panel idea.... if i was Don Buchla there d ALREADY be a letter from my lawyer in your mailbox! ;^ maybe we should follow a
Re: I2C bus for expansion
2006-03-29 by drmabuce
Hi Dave thanks for your thorough reply. This forum has been very instructive for me... a real bonus! ... ah so! that helps... i see how this was an exploratory
Re: I2C bus for expansion
2006-03-29 by djbrow54
... For those with scope envy, I put a screen shot of the DPO4000 decoding the I2C bus in my photo album. This was my experiment to send a single byte of
Re: I2C bus for expansion
2006-03-29 by djbrow54
... Here s the meandering flow of my thoughts ... I was designing the front panel and thought that I should bring the I2C out to the front panel in an
Re: I2C bus for expansion
2006-03-29 by drmabuce
Hi Dave ... (first off... like John i must confess my scope-envy.... dang.... some poor guys only have money and good looks but your scope translates
Re: I2C bus for expansion
2006-03-29 by djbrow54
... You know, this scope is quite affordable. But no, I ve just borrowed it for now. I did manage to interface the AtomPro24 I2C to a SAA1064 I2C to 7 segment
RE: [ComputerVoltageSources] Re: I2C bus for expansion
2006-03-29 by John Loffink
Do we have to pay for your DPO4000 too? That will be one expensive piece of code. :-) John Loffink The Microtonal Synthesis Web Site
Re: I2C bus for expansion
2006-03-29 by djbrow54
Thanks to John s help I was able to decode the I2C from the AtomPro24. The forum has several comments about people having lots of issues with the I2COut
RE: [ComputerVoltageSources] Re: I2C bus for expansion
2006-03-28 by John Loffink
Software mode just bit bangs GPIOs, so there should be no contention with the I2C HW since the 3664 pins won t be configured for it. John Loffink The
Re: I2C bus for expansion
2006-03-28 by Grant Richter
Can you use the software I2C command with the hardware I2C port pins? Will they fight with each other?
RE: [ComputerVoltageSources] I2C bus for expansion
2006-03-28 by John Loffink
... Me. I2C is commonly used for temperature monitoring and other low level controls in storage and server products. John Loffink The Microtonal Synthesis Web
Re: Display Help
2006-03-28 by djbrow54
... Funny you should mention this. No one has ever asked me if I plan to donate my source code. I m just sitting quietly waiting for my spec to be designed
I2C bus for expansion
2006-03-28 by djbrow54
I ve been thinking about my speakjet and whether I want to change the interface. It is interfaced using P6 and P7 for serial output and buffer half full. The
Re: Display Help
2006-03-28 by drmabuce
No, Silly! that gets ***silkscreened*** on the CVS MAIN PCB!!!!! (along with the amount!) 8] -doc
Re: [ComputerVoltageSources] Re: Display Help
2006-03-28 by harrybissell
uhhh... not It says... send check or money order to Harry Bissell.... :^P H^) harry
Re: Display Help
2006-03-27 by drmabuce
Hi Dave sorry for the delay. i had PAYING gigs all weekend (all too rare!) ... IMHO, it should say: CVS LCD display by Dave Brown you should get a curtain
LCD prototype development photo uploaded
2006-03-26 by djbrow54
Got some basic functionality today working with an existing 2x20 LCD. I ve ordered the 2x16 LCD from Digikey along with some 2313 s and a zif socket. Put a
Re: [ComputerVoltageSources] Calibrated Inputs
2006-03-26 by harrybissell
The trimpot in the feedback would allow you to calibrate exactly ONE input resistor perfectly... as would having the pot in series with exactly ONE input
RE: [ComputerVoltageSources] Re: resistor matching, was RE: Calibrated Inputs
2006-03-26 by John Loffink
Yes, using a MIDI-CV converter with 12 bit or better resolution, which is most of them. John Loffink The Microtonal Synthesis Web Site
Re: resistor matching, was RE: Calibrated Inputs
2006-03-26 by Larry T.
Okay. But could you use the output of a MIDI-CV converter or a CV keyboard as your reference and still use this method? It should still be consistant across
RE: [ComputerVoltageSources] Re: resistor matching, was RE: Calibrated Inputs
2006-03-26 by John Loffink
For calibration you need to measure an amplified value, even if the amplification is 1. You can t do that by grounding the signal. That just sets the zero
Re: resistor matching, was RE: Calibrated Inputs
2006-03-26 by Larry T.
Thinking about it, I believe this would also account for varrainces in the ADC s thenselves would nt it? Larry T.
Re: resistor matching, was RE: Calibrated Inputs
2006-03-26 by Larry T.
HI All Given that I m not an EE or even a decent hobby designer, why is this calibration such a problem? Why not use trim pots and the Analog inputs
Re: resistor matching, was RE: Calibrated Inputs
2006-03-25 by Grant Richter
You already have a precision voltage source in your analog keyboard or MIDI to CV converter. The purpose of the calibrated input is so we can read an analog
Display Help
2006-03-25 by djbrow54
My display spec has a set of pre-programmed default fonts for the eight user defined characters. What do people want? My treble clef really sux. Can someone
RE: [ComputerVoltageSources] resistor matching, was RE: Calibrated Inputs
2006-03-25 by John Loffink
I think you re on the right track. Use a voltage reference chip, not your power supply. Feed this to a high accuracy low voltage offset differential
Re: 5U Panel Design
2006-03-25 by djbrow54
I just put 4 fpd designs in the front panel folder. I am undecided on the number of calibrated inputs so I tried different layouts with none, 4, or 8. I also
5U Panel Design
2006-03-25 by djbrow54
I got it all to fit in a 5U x 5U panel. I uploaded a photo to my photo folder. The display PCB is much larger than the display area so I had to move some
resistor matching, was RE: Calibrated Inputs
2006-03-25 by John Mahoney
Re: matching resistors, will the following procedure work? Ingredients: 1 precision voltage reference 1 amplifier 1 voltmeter Resistors to be matched (RTBM)
Re: some dumb newbie questions
2006-03-25 by Michael A. Firman
After a little bit of a false start (due to a keyspan USB- Serial interface going bad on me) I can report that I am happily and easily programming the PSIM-1
RE: [ComputerVoltageSources] Calibrated Inputs
2006-03-24 by John Loffink
I believe the calibrated jacks will go directly to the A/D summing nodes, while the non-calibrated jacks will go through the attenuators. Correct? The problem
Calibrated Inputs
2006-03-24 by Grant Richter
... In the summing section of a typical VCO or synth module, you use 1% resistors. That is 1 part in 100 accuracy. The input A/D is 10 bits or 1 part in 1024.
Re: Front Panel
2006-03-24 by Grant Richter
Those are nice designs. Maybe all connectors on one panel and all knobs on another? I know the MOTM format is horizontal, but a vertical layout would be
Re: some dumb newbie questions
2006-03-24 by drmabuce
Hi Jason ok i ll try to tackle these, i m more of a software guy too. you hardware gurus feel free to jump in anytime if i f^&k this up! ; ... i suggest that
Re: some dumb newbie questions
2006-03-24 by data2action
jason-- welcome... yeah, we had a number of folks join in the last couple days. probably worth plowing thru th messages so far to get up to speed. your
some dumb newbie questions
2006-03-24 by Jason Proctor
i m not really up on what s going on with the concept, having caught the beginning of this thread on sdiy and then lost it until a day or two ago when i
Re: Front Panel
2006-03-24 by djbrow54
I did a 6U MOTM concept in FPD. Didn t spend much time lining things up but rather wanted to see how it all fit. I used the 0.75 knobs with spacing similar
RE: [ComputerVoltageSources] Re: Front Panel
2006-03-24 by John Mahoney
The Stooge panel designs for the PSIM may be useful for panel design inspiration: http://larry.retrosynth.com/larry/panel/gif/psim3.gif
RE: [ComputerVoltageSources] Re: Front Panel
2006-03-24 by John Loffink
Yes please. John Loffink The Microtonal Synthesis Web Site http://www.microtonal-synthesis.com The Wavemakers Synthesizer Web Site
RE: [ComputerVoltageSources] Re: Front Panel
2006-03-24 by John Loffink
Personally I feel the PKES70 type knob is a good compromise in the MOTM format. But even that seems like a 5 or 6U wide MOTM panel. I bet the only chance of
Re: Front Panel
2006-03-24 by pow333us
... horizontally. ... the ... other ... Could it be built 4U X 5U, then it could fit a motm or doepfer right? Seems like that way the maximum possible audience