tag:blogger.com,1999:blog-252642453295590453.post3472862217473117501..comments2022-03-01T07:12:28.909+00:00Comments on Steve Marple's blog: Calunium v2.0: Preliminary designSteve Marplehttp://www.blogger.com/profile/15582257560382364498noreply@blogger.comBlogger11125tag:blogger.com,1999:blog-252642453295590453.post-81314538389518268992012-11-13T23:10:52.612+00:002012-11-13T23:10:52.612+00:00Thanks for your kind offer but I can't take cr...Thanks for your kind offer but I can't take credit for any of the bootloaders as I've not written one at all. By the way have you come across the xboot bootloader? Very nice indeed, works with avrdude and the Arduino IDE. With its API I can also upgrade my magnetometer with over-the-air firmware updates. Will have to write a blog post. In the meantime you can find the source code and my config options at <a href="https://github.com/stevemarple/xboot" rel="nofollow">https://github.com/stevemarple/xboot</a>. The upload protocol for avrdude should be avr109.Steve Marplehttps://www.blogger.com/profile/15582257560382364498noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-80500927633994152512012-11-13T14:30:24.244+00:002012-11-13T14:30:24.244+00:00Here's my email.Here's my email. <br /><br />Robbieuitoshttps://www.blogger.com/profile/18245352940933766696noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-22699791433558206932012-11-13T09:19:45.554+00:002012-11-13T09:19:45.554+00:00Hi Steve,
I would like to contact you. I made a P...Hi Steve,<br /><br />I would like to contact you. I made a PCB based on your bootloader and would like you to have one. Robbieuitoshttps://www.blogger.com/profile/18245352940933766696noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-29991204569910383472012-09-02T21:45:32.271+01:002012-09-02T21:45:32.271+01:00Iteadstudio won't be selling them and I have n...Iteadstudio won't be selling them and I have no immediate plans to. I'll put the Gerber files on Github so that anyone who wants to can get some made. Suat Özgür (see earlier comment) has some v1.0 boards for sale if that helps.Steve Marplehttps://www.blogger.com/profile/15582257560382364498noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-32707366352261657532012-08-20T07:42:01.060+01:002012-08-20T07:42:01.060+01:00Great news, cannot wait till the PCBs will be read...Great news, cannot wait till the PCBs will be ready :-) Will iteadstudio also sell those PCBs? Or will you sell them?TomasMhttps://www.blogger.com/profile/07641545773632826266noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-42286711536953596502012-08-16T22:51:21.875+01:002012-08-16T22:51:21.875+01:00I'm nearly ready to send the design off to Ite...I'm nearly ready to send the design off to Iteadstudio. I've found room to include a 5 V regulator, microSD card and Hope RFM12B.Steve Marplehttps://www.blogger.com/profile/15582257560382364498noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-71102375549952208312012-08-16T22:44:26.941+01:002012-08-16T22:44:26.941+01:00I covered logic level shifting in a previous blog ...I covered logic level shifting in a previous blog post, <a href="http://blog.stevemarple.co.uk/2011/10/interfacing-33v-devices-to-5v-arduinos.html" rel="nofollow">http://blog.stevemarple.co.uk/2011/10/interfacing-33v-devices-to-5v-arduinos.html</a>. The shield you refer to demonstrates two problems. Without level-translation on the output (MISO) the SD card can't meet the worst case limit for a high-level input at the MCU. Worse still there is no protection on MISO when used with 5V SPI devices, which could kill the SD card. The simplest approach is to run the MCU at 3.3 V.Steve Marplehttps://www.blogger.com/profile/15582257560382364498noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-62620565916745448102012-08-14T15:01:06.972+01:002012-08-14T15:01:06.972+01:00Hi,
there is possible to do logic level translatio...Hi,<br />there is possible to do logic level translation for SD with just 6 resistors - no need special level translator. As in this shield: http://www.hwkitchen.com/products/sd-card-shield-for-arduino-v2-1/. Or, of course with CMOS4050 - is there not enough space for this? And fullsize SD socket might be located at back side of PCB - as in RaspberryPi.TomasMhttps://www.blogger.com/profile/07641545773632826266noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-26792708541775970732012-07-21T21:17:32.610+01:002012-07-21T21:17:32.610+01:00That's an interesting suggestion. I had overlo...That's an interesting suggestion. I had overlooked that idea because I already have a combined <a href="http://blog.stevemarple.co.uk/2011/12/rn-xvsd-shield.html" rel="nofollow">RN-XV / SD</a> shield. There's not enough room for a full-size SD socket but a reduced size one similar to that used on the Raspberry Pi would fit. Although a microSD socket would fit I think it could be a bit difficult for many users to solder; one of the original aims of my Calunium project was to use through hole components to allow as wide an audience as possible to build it.<br /><br />There's not enough space for logic-level translation so use with SD card would be restricted to 3.3 V operation (same as for the Hope RFM12B option).Steve Marplehttps://www.blogger.com/profile/15582257560382364498noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-66169739736886544782012-07-20T14:29:39.249+01:002012-07-20T14:29:39.249+01:00Hi,
I would prefer the SD-card interface (or micr...Hi,<br /><br />I would prefer the SD-card interface (or microSD).<br /><br />Thanks,<br />TomasTomasMhttps://www.blogger.com/profile/07641545773632826266noreply@blogger.comtag:blogger.com,1999:blog-252642453295590453.post-99858039107420502012-06-25T10:03:52.255+01:002012-06-25T10:03:52.255+01:00I'd prefer the 5V regulator :)
PS: I've a...I'd prefer the 5V regulator :)<br /><br />PS: I've a couple of Calunium v1.0 PCBs here. If someone is interested drop me a mail s[at]sui[dot]liSuat Özgürhttps://www.blogger.com/profile/15961495731747486103noreply@blogger.com