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electronics.stackexchange.com

My last review request is here Last_review I have two question, is my SDRAM, LCD and Ethernet layout good? And why when I start simulate the SI in Altium, the result said my max impedance in this l...

linuxtoday.com

The wc (word count) command is used to find line, word, and character counts. Learn 6 top WC command examples for Linux here.

cbronline.com

data-driven insight and authoritative analysis for business, digital, and policy leaders in a world disrupted and inspired by technology

alanbmitchell.wordpress.com

Building Energy Use Monitoring and Analysis

gadgetmakersblog.com

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kompf.de

blog von martin kompf: artikel, texte, projekte, informationen zu den themen c++ (cplusplus), java, j2ee, wetter, technik, gps und geotagging.

iada.nl

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webshed.org

This article was first published on an earlier version of this website in 2012. I’ve re-uploaded here primarily for historical interest. There is a fair bit of information regarding the AD9851 DDS (as used on the NJQRP DDS-60 daughter card) chip with Microchip PICs and Arduino development boards, but not much for the slightly cheaper and lower spec (but still good) AD9850. The AD9850 has no internal reference clock multiplier, requiring a faster reference clock than the AD9851. Not having an internal multiplier means that the code written for the AD9851 will not work directly on the AD9850 - the code will attempt to set registers that do not exist in the AD9850. A no-frills AD9850 DDS module can be obtained from eBay for around £4 at the time of writing (August 2012) and will produce a decent signal from a few Hz to over 30 MHz. A read of the datasheet provides all the information needed to drive the DDS chip and get some RF out. Initialising and resetting the AD9850 These code fragments are written in the C++-like language the Arduino development board uses. (Thanks to Robert, VA3ROM, for pointing out an issue in the code; I had a delay(5), not delayMicroseconds(5), so my delays were 1000x what they should be! It still worked; it just slowed the code down significantly.) #define DDS_CLOCK 125000000 #define CLOCK 8 //pin connections for DDS #define LOAD 9 #define DATA 10 #define RESET 11 void AD9850_init() { digitalWrite(RESET, LOW); digitalWrite(CLOCK, LOW); digitalWrite(LOAD, LOW); digitalWrite(DATA, LOW); } void AD9850_reset() { //reset sequence is: // CLOCK & LOAD = LOW // Pulse RESET high for a few uS (use 5 uS here) // Pulse CLOCK high for a few uS (use 5 uS here) // Set DATA to ZERO and pulse LOAD for a few uS (use 5 uS here) // data sheet diagrams show only RESET and CLOCK being used to reset the device, but I see no output unless I also // toggle the LOAD line here. digitalWrite(CLOCK, LOW); digitalWrite(LOAD,

noveldevices.co.uk

a collection of useful information about the raspberry pi for the novice user