http://forums.leaflabs.com/topic.php?id=74268 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:18:17 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=74268#post-105206 Wed, 29 Jan 2014 07:54:07 +0000 gbulmer 105206@http://forums.leaflabs.com/ <p>samtal - I don't work for LeafLabs, and I don't call myself an expert. However, let me offer some views.</p> <p>Clearly I like STM32F and Maple. However, I am ready and willing to use Arduino (I am using it on a project at the moment).</p> <p>So it may be that some simple, clear differences are all the criteria needed to make a rational choice.<br /> If an Arduino does everything the project is likely to need, you are happy to use its libraries and IDE, and the end-user is happy or takes your recommendation, then it seems a pretty straightforward decision to me.</p> <p>How big is the data that you are storing in EEPROM? Might it all fit within the STM32F's battery-backed RAM area? IIRC is much faster to write a few bytes into that than EEPROM. I can't think of any other decision criteria based on the project description.</p> <p>Some of your feedback, and others, about the Maple's power supply went into the Community Maple re-designs. </p> <p>Some of the specific changes in <a href="https://github.com/gbulmer/openstm32hw/tree/master/Orone-mini-v0">Orone-mini</a> are intended to provide a more robust power supply (at github: <a href="https://github.com/gbulmer/openstm32hw/tree/master/Orone-mini-v0" rel="nofollow">https://github.com/gbulmer/openstm32hw/tree/master/Orone-mini-v0</a> )<br /> It has a polyfuse protecting the USB host, ESD protection, and a larger digital-supply voltage regulator with more headroom.</p> <p>I am surprised that the PS diode failed, and resulted in a permanent short to ground. I don't think I've seen that failure-mode. If I understood your comment, you removed the PS diode, and the short-to-ground persisted; is that accurate? </p> http://forums.leaflabs.com/topic.php?id=74268#post-105205 Wed, 29 Jan 2014 06:34:56 +0000 samtal 105205@http://forums.leaflabs.com/ <p>After almost two years away from Maple, I started an old-new project.<br /> In the meantime, I had the chance to look at Arduino Mega, and even ported a simple Maple-r5 project to the Mega, which worked nicely.</p> <p>I now have to decide whether to build the new project with Maple or with Arduino.<br /> The cons for Arduino: (1) EEPROM that enables very large number write / read and (2) The use of one USB port for everything (I only need one!).<br /> The Maple pro's are mainly its speed (32 bits, 70 Mhz).<br /> (Another project with 10 12-bits Analog with DMA could only be done on the Maple) </p> <p>One more thing: I have some doubts about Maples hardware reliability: I lost 4 Maples-r5 by connecting an external 9V Power-supply, for no apparent reason.<br /> As soon as I connected the PS (any), the external PS serial diode went up in smoke, and a permanent short to ground persisted, even after removing all components from the board).<br /> Being an experienced electrical engineer, I tested everything I could think of, like jumpers, ground loops, spikes, over-voltage, but could not find the reason.</p> <p>I would like to read LeafLabs' or any other experts' comments on my observations before I make my decision.<br /> Thanks,<br /> samtal </p>