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Pork Rhombus

Member Since: August 14, 2009

Country: United States

  • I've got the predecessor to this iron - the one that was on clearance for $29.95. Do you still carry replacement tips for that one, and if not, do you know who does?

  • Try grounding the arduino and the relay board to a central ground point rather than bringing relay ground back on board the arduino. I've had analog readings skewed by changing currents in the ground path. Also try filtering the analog Vcc separately from the digital Vcc.

  • Basic? Yes. Low-cost? You think? Four dollars seems excessive to me. Surely a tiny sliver of PCB with absolutely nothing on it should be under a dollar.

  • The 6210 is not a bridge - it's just an array of 8 Schottky diodes. Perhaps you are thinking of the L6201 which is a single H-bridge with integrated diodes.

  • Can we have this back at the original $8.95 price please. I was shocked when it came back into stock $5 more than before.

  • Of course they can! You just described it! Only two issues I can think of are (i) you can't be listening while sending (i.e. half-duplex, not full duplex comms) and (ii) when you send, it will probably 'deafen' the receiver on the same board for a short time afterward while the AGC readjusts. A little thought and you might be able to come up with ways to lessen this effect (pwr down the receiver board while sending, put the receiver in a grounded enclosure and disconnect its antenna feed while sending, etc. I don't know how well these would work, or even if the dead time after sending a packet would be a problem in your application, but play, play, play!)

  • My application is similar to yours, rjimenez, and like you I am concerned with damaging the cell long-term. My impression is that lithium ion cells are happiest when they are not under continuous charge. If they are allowed to 'relax' to about 3.9 or 4.0V they seem to last longer than if they are held at 4.2V for long stretches of time (I'd appreciate CaptainKirk's comment on that ... wait, did I really just say that ?) I am going to set up a little testbed where I have extra diodes coming from the MAX1555 GND to ground and from the BAT pin to the cell under charge. I figure if the Vf's are different I can detune the max charging voltage by 0.1 or 0.2V.

  • As far as I can see, the datasheet does not actually mention any trickle charging after the main charge is complete. I'd like to know if this IC does in fact go into a trickle charge mode, and if so, what is the trickle charge current? I want to use it to maintain a back up battery, so external power will almost always be present. I don't want to wreck the lithium cell by continuing to trickle charge it. If you know the answer, please share it ! Thanks.

  • Alright then. Here's my 2 cents ...
    My brother had been on at me for years to get into PICs saying how much I would enjoy this stuff. But to me it seemed so daunting, like standing next to the black monolith from 2001. One day I decided to give the Arduino a try and picked one up from the local hole-in-the-wall electronics shop. I wasn't really sure how it all worked, I just knew that all I needed was a USB cord, which I already had. So why not? Before long I was spending every available minute tinkering with it. I already knew a little about electronics but hadn't touched programming since I fudged my way through my Comp Sci diploma (wasn't really digging it). In the year-and-a-half since I got the duemilanove, I've branched out into standalone projects, first by porting the Arduino hex files then by programming under AVR Studio. I've done a lot of work with ATTINYs now and pretty much know most of what's in the full data sheets (or at least where to find it). I'm amazed that the projects I've chosen to work on have each led to me exploring the devices on a deeper or a more subtle level. I don't think I could have done better if I was planning a course for myself with the benefit of hindsight.
    In a nutshell, the Arduino has opened a door into a fascinating and satisfying part of my life. I mean, my idea of fun now includes thinking about how to improve my algorithms while I'm lying in bed at night! It sounds almost mad, but I can't imagine giving it up. I suppose I have got the bug pretty bad. I'm an addict, and it feels great!
    So to those who say if you start with the Arduino you'll be stuck with the Arduino, my experience strongly contradicts that. I think it depends what kind of projects you take on. If it's anything remotely performance-critical, you're going to want to get down to ports and fuses, and you will have to look closely at where your CPU cycles are going. Personally I love the challenge of working with such 'limited' devices. And if you want to make more than one of something, it would be silly to put an Arduino in each one.
    To those who say it hinders an appreciation of 'real' electronics, I can only say it's re-energized my own efforts to improve my skills in this area. Like when I got a digital camera and, thanks to the convenience factor, actually started taking photographs again. Sure, they aren't as good as 6x6 transparencies on Fuji Velvia, but ...
    It is arguably true that direct connections from microcontroller projects to full-on analog circuit design, with transistors and zeners all carefully chosen for their specific properties, are few and far between. BUT once a person discovers this particular facet of electronics it is surely more likely that they will discover more as their interests expand, perhaps, beyond microcontrollers.
    My Arduino isn't gathering dust either. I reach for it when all my breadboards are full, or if I want to do a quick proof-of-concept, or if I'm feeling lazy, or just for old time's sake!
    The only thing I would change about the hardware would be to standardize the gap between headers to a multiple of 0.1" (or eliminate it altogether). And yes, my v21 software is much slower to load than previous versions of the IDE. But these are surely trifles. This thing is great at what it does.

  • I used the SFE cam file but when I submitted my gerbers to the Advanced Circuits DFM bot it thought they were 274D format not 274X - any idea why this might be?

No public wish lists :(