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LeafLabs Garden » User Favorites: galindro 3911 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:20:57 +0000 http://bbpress.org/?v=1.0.2 <![CDATA[Search]]> q http://forums.leaflabs.com/search.php manitou on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-10473 Thu, 03 May 2012 17:03:42 +0000 manitou 10473@http://forums.leaflabs.com/ The SD portion of the Arduino SD/RTC shield <a href="http://www.adafruit.com/products/243" rel="nofollow">http://www.adafruit.com/products/243</a> seems to work with Maple (RET6) using mapleSDfat library. I don't think the RTC will work because I2C pins on shield plug into maple pins 19-20 x893 on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-6052 Tue, 23 Aug 2011 11:03:02 +0000 x893 6052@http://forums.leaflabs.com/ with minimal changes you can use SN65HVD11 from TI (3.3V pin compatible with MAX481). Only change power of chip from 5V line to 3.3V. mikep on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-6051 Tue, 23 Aug 2011 10:05:11 +0000 mikep 6051@http://forums.leaflabs.com/ I would start a new topic for this and call it "Maple and DMX protocol" or something like that ... (at the top of <a href="http://forums.leaflabs.com/" rel="nofollow">http://forums.leaflabs.com/</a> under "Latest Discussions" should be a link to add a new topic). lucasvl on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-6049 Tue, 23 Aug 2011 02:20:54 +0000 lucasvl 6049@http://forums.leaflabs.com/ Hi Mike, Thanks a lot for your reply! I think I can get the hardware working based on your comment. I am currently working with Arduino Mega, though, because the shield has been designed specifically for it - but mainly because there is an easy-to-use library: <blockquote>2. The shield works with the "DmxSimple" library... <a href="http://code.google.com/p/tinkerit/wiki/DmxSimple" rel="nofollow">http://code.google.com/p/tinkerit/wiki/DmxSimple</a> ... from "Tinker.it!"</blockquote> Would like to change to Maple to get more calculation power for my current project or the next. Unfortunately a lot of the library is low-level programming which I really don't know the first thing about (I should learn but that doesn't help me now ;-) ) Some code from library that I have not the faintest idea what it means, but it should send out a DMX byte (<a href="http://en.wikipedia.org/wiki/DMX512)" rel="nofollow">http://en.wikipedia.org/wiki/DMX512)</a>: <code> /** Transmit a complete DMX byte * We have no serial port for DMX, so everything is timed using an exact * number of instruction cycles. * * Really suggest you don't touch this function. */ void dmxSendByte(volatile uint8_t value) { uint8_t bitCount, delCount; __asm__ volatile ( "cli\n" "ld __tmp_reg__,%a[dmxPort]\n" "and __tmp_reg__,%[outMask]\n" "st %a[dmxPort],__tmp_reg__\n" "ldi %[bitCount],11\n" // 11 bit intervals per transmitted byte "rjmp bitLoop%=\n" // Delay 2 clock cycles. "bitLoop%=:\n"\ "ldi %[delCount],%[delCountVal]\n" "delLoop%=:\n" "nop\n" "dec %[delCount]\n" "brne delLoop%=\n" "ld __tmp_reg__,%a[dmxPort]\n" "and __tmp_reg__,%[outMask]\n" "sec\n" "ror %[value]\n" "brcc sendzero%=\n" "or __tmp_reg__,%[outBit]\n" "sendzero%=:\n" "st %a[dmxPort],__tmp_reg__\n" "dec %[bitCount]\n" "brne bitLoop%=\n" "sei\n" : [bitCount] "=&d" (bitCount), [delCount] "=&d" (delCount) : [dmxPort] "e" (dmxPort), [outMask] "r" (~dmxBit), [outBit] "r" (dmxBit), [delCountVal] "M" (F_CPU/1000000-3), [value] "r" (value) ); } </code> Alternatively, apparently one can get it to work by disabling interrupts and only a few lines of low-level stuff (<a href="http://arduino.cc/playground/DMX/Examples)" rel="nofollow">http://arduino.cc/playground/DMX/Examples)</a>: <code> /* DMX Shift Out for arduino - 004 and 005 * ------------- * * Shifts data in DMX format out to DMX enabled devices * it is extremely restrictive in terms of timing. Therefore * the program will stop the interrupts when sending data * * The elektronic foundation for DMX is RS 485, so you have to use * a MAX-485 or a 75176. * * wirring for sending dmx with a MAX-485 1 - RO - Receiver Output --- set to ground with a 100 ohm resistor 2 - RE - Receiver Output Enable -- set to ground 3 - DE - Driver Output Enable -- set to 5v 4 - DI - Driver Input -- Input from Arduino 5 - GnD - Ground Connection -- set to ground -- refence for the DMX singal --- (DMX pin 1) 6 - A - Driver Output / Receiver Input -- DMX Signal (hot)------------------ (DMX pin 3) 7 - B - Driver Output / Receiver Input -- DMX Signal inversion ( cold)------ (DMX pin 2) 8 - Vcc - Positive Supply -- 4,75V < Vcc < 5,25V * Every dmx packet contains 512 bytes of information (for 512 channels). * The start of each packet is market by a start byte (shiftDmxOut(sig,0);), * you should always send all 512 bytes even if you don*t use all 512 channels. * The time between every dmx packet is market by a break * between 88us and 1s ( digitalWrite(sig, LOW); delay(10);) * * (cleft) 2006 by Tomek Ness and D. Cuartielles * K3 - School of Arts and Communication * fhp - University of Applied Sciences * <http://www.arduino.cc> * <http://www.mah.se/k3> * <http://www.design.fh-potsdam.de> * * @date: 2006-09-30 * @idea: Tomek Ness * @code: D. Cuartielles and Tomek Ness * @acknowledgements: Johny Lowgren for his DMX devices * */ int sig = 11; int count = 0; int swing = 0; int updown = 0; /* Sends a DMX byte out on a pin. Assumes a 16 MHz clock. * Disables interrupts, which will disrupt the millis() function if used * too frequently. */ void shiftDmxOut(int pin, int theByte) { int wasteTime = 0; int theDelay = 1; int count = 0; int portNumber = port_to_output[digital_pin_to_port[pin].port]; int pinNumber = digital_pin_to_port[pin].bit; // the first thing we do is to write te pin to high // it will be the mark between bytes. It may be also // high from before _SFR_BYTE(_SFR_IO8(portNumber)) |= _BV(pinNumber); delayMicroseconds(10); // disable interrupts, otherwise the timer 0 overflow interrupt that // tracks milliseconds will make us delay longer than we want. cli(); // DMX starts with a start-bit that must always be zero _SFR_BYTE(_SFR_IO8(portNumber)) &= ~_BV(pinNumber); //we need a delay of 4us (then one bit is transfert) // at the arduino just the delay for 1us is precise every thing between 2 and 12 is jsut luke // to get excatly 4us we have do delay 1us 4 times delayMicroseconds(theDelay); delayMicroseconds(theDelay); delayMicroseconds(theDelay); delayMicroseconds(theDelay); for (count = 0; count < 8; count++) { if (theByte & 01) { _SFR_BYTE(_SFR_IO8(portNumber)) |= _BV(pinNumber); } else { _SFR_BYTE(_SFR_IO8(portNumber)) &= ~_BV(pinNumber); } delayMicroseconds(theDelay); delayMicroseconds(theDelay); delayMicroseconds(theDelay); // to write every bit exactly 4 microseconds, we have to waste some time here. //thats why we are doing a for loop with nothing to do, a delayMicroseonds is not smal enough for (wasteTime =0; wasteTime <2; wasteTime++) {} theByte>>=1; } // the last thing we do is to write the pin to high // it will be the mark between bytes. (this break is have to be between 8 us and 1 sec) _SFR_BYTE(_SFR_IO8(portNumber)) |= _BV(pinNumber); // reenable interrupts. sei(); } void setup() { pinMode(sig, OUTPUT); digitalWrite(13, HIGH); } void loop() { // sending the break (the break can be between 88us and 1sec) digitalWrite(sig, LOW); delay(10); //sending the start byte shiftDmxOut(sig,0); shiftDmxOut(sig, 255); //1 shiftDmxOut(sig, 0); //2 shiftDmxOut(sig, 0); //3 shiftDmxOut(sig, 0); //4 shiftDmxOut(sig, 0); //5 shiftDmxOut(sig, 0); //6 shiftDmxOut(sig, 0); //7 shiftDmxOut(sig, 255); //8 for (count = 1; count<=504; count++){ //the rest shiftDmxOut(sig, 0); } } </code> This alternative might be easier to port to Maple (although the timing will be different casue it's based on processor speed it seems?) ? Don't know if this is the right place to ask but: 1. can you analyse if one of the alternatives is actually easy to port, once I learn some Assembler? 2. in any case, it would be great for everyone to be able to use Maple with DMX... perhaps someone is interested in porting the library? (please lemme know if this is off-topic and where it should go, I am not used to posting to forums, etc.) mikep on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-6003 Wed, 17 Aug 2011 11:25:07 +0000 mikep 6003@http://forums.leaflabs.com/ Looking at the schematic of the shield, it looks like it's using a MAX481CSA chip, which operates at 5V. The Maple Pin that corresponds to the Arduino 5V pin is called VDDA and only supplies 3.3V. So I think it won't work without any hardware modifications (e.g. adding a 5V regulator to the shield and powering that from the Maple Vin pin, or powering the maple through USB and use the Maple's Vin pin to supply 5V to the shield). But maybe the MAX481 works down to 3.3V (even though it's not saying that in the datasheet), so you could try it, I don't think it'll break anything. Regards, Mike lucasvl on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-6001 Wed, 17 Aug 2011 09:49:24 +0000 lucasvl 6001@http://forums.leaflabs.com/ Hi, 1. I'm looking to use this DMX shield... <a href="http://www.skpang.co.uk/catalog/arduino-dmx-shield-with-usd-card-holder-p-663.html" rel="nofollow">http://www.skpang.co.uk/catalog/arduino-dmx-shield-with-usd-card-holder-p-663.html</a> ... with the Maple. Do you know if it is compatible? 2. The shield works with the "DmxSimple" library... <a href="http://code.google.com/p/tinkerit/wiki/DmxSimple" rel="nofollow">http://code.google.com/p/tinkerit/wiki/DmxSimple</a> ... from "Tinker.it!" Do you know if it is compatible? Hope someone has already tried this or can give some feedback... thanks! mbolivar on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-5951 Tue, 09 Aug 2011 14:15:39 +0000 mbolivar 5951@http://forums.leaflabs.com/ Hi galindro, Thanks for the suggestions! That table could definitely use some expansion. We're working on some Wiki posts regarding SD shield compatibility right now, actually. galindro on "Compatible Shields" http://forums.leaflabs.com/topic.php?id=969#post-5948 Tue, 09 Aug 2011 13:52:43 +0000 galindro 5948@http://forums.leaflabs.com/ Hi! I know there is a link with the shield and device compatible list (<a href="http://leaflabs.com/docs/arduino-compatibility.html#shield-and-device-compatibility)" rel="nofollow">http://leaflabs.com/docs/arduino-compatibility.html#shield-and-device-compatibility)</a>, but, I suggest that is placed on this table, the following shields to be tested: 1 - Arduino Sensor Shield V5 -> <a href="http://www.emartee.com/product/41953/Arduino%20Sensor%20Shield%20V5.0" rel="nofollow">http://www.emartee.com/product/41953/Arduino%20Sensor%20Shield%20V5.0</a> 2 - SD Card Module -> <a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270720898973&ssPageName=ADME:L:OC:US:1123" rel="nofollow">http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270720898973&ssPageName=ADME:L:OC:US:1123</a> 3 - RTC DS1307 Shield -> <a href="http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270729898023&ssPageName=ADME:L:OC:US:1123#ht_3194wt_1185" rel="nofollow">http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=270729898023&ssPageName=ADME:L:OC:US:1123#ht_3194wt_1185</a> 4 - GPRS Shield -> <a href="http://www.seeedstudio.com/depot/gprs-shield-p-779.html?cPath=132_134" rel="nofollow">http://www.seeedstudio.com/depot/gprs-shield-p-779.html?cPath=132_134</a> 5 - GPS Shield -> <a href="http://www.sparkfun.com/products/10710" rel="nofollow">http://www.sparkfun.com/products/10710</a> Is it possible?