http://forums.leaflabs.com/topic.php?id=9121 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:16:26 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=9121#post-20195 Fri, 05 Oct 2012 05:53:58 +0000 crowja 20195@http://forums.leaflabs.com/ <p>@gbulmer:<br /> ok, thank yout very much for the help. iam very appreciate with it :D<br /> i will try built level shifter, but i have one more question, the camera module produce picture digital data though 11 pin:</p> <p>Y0 - Y7: its pixel data<br /> HREF: its horizontal reference<br /> VSYN: its indicate new frame<br /> PCLK: its pixel syncronization.</p> <p>should i convert the level logic of all this pin??thanks :) </p> http://forums.leaflabs.com/topic.php?id=9121#post-20184 Thu, 04 Oct 2012 06:41:10 +0000 gbulmer 20184@http://forums.leaflabs.com/ <p>crowja - yes it is possible to connect i2c 5V to a 3.3V microcontroller.</p> <p>There are dedicated chips called level shifters, but there is a simple, low-cost scheme using two MOSFETs.<br /> This application note (from Philips, now NXP, who inveted I2C) explains how in "2.3 Devices with different logic levels connected via the bi-directional level shifter":<br /> <a href="http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf" rel="nofollow">http://ics.nxp.com/support/documents/interface/pdf/an97055.pdf</a> </p> http://forums.leaflabs.com/topic.php?id=9121#post-20183 Thu, 04 Oct 2012 06:19:32 +0000 crowja 20183@http://forums.leaflabs.com/ <p>i think i dont have, is it possible connect i2c 5v device on maple mini? </p> http://forums.leaflabs.com/topic.php?id=9121#post-20182 Thu, 04 Oct 2012 06:17:37 +0000 crowja 20182@http://forums.leaflabs.com/ <p>i was new in hardware programming, i have tried each i2c pin on maple mini (0,1) and (15, 16) but the result was same :(<br /> is any suggestion for me make it work on maple mini? </p> http://forums.leaflabs.com/topic.php?id=9121#post-20181 Thu, 04 Oct 2012 06:01:41 +0000 manitou 20181@http://forums.leaflabs.com/ <p>I have a Maple RET6. Pins 0 and 1 are NOT 5v tolerant on RET6.<br /> do you have 3.3v I2C device you can try? </p> http://forums.leaflabs.com/topic.php?id=9121#post-20180 Thu, 04 Oct 2012 05:44:34 +0000 crowja 20180@http://forums.leaflabs.com/ <p>@manitou:<br /> i have tried it using 4k7 pullup resitor, can i know what maple is u'are using? is it make sense if my leaf maple mini i2c device is broke? thanks </p> http://forums.leaflabs.com/topic.php?id=9121#post-20179 Thu, 04 Oct 2012 05:31:47 +0000 manitou 20179@http://forums.leaflabs.com/ <p>arduino has internal pullups that Wire library uses, so usually you need pullups with maple</p> <p>if you are using 5v to device, only some of maple pins are 5v tolerant. check the spec sheet<br /> for the version of maple you are using </p> http://forums.leaflabs.com/topic.php?id=9121#post-20178 Thu, 04 Oct 2012 00:07:40 +0000 crowja 20178@http://forums.leaflabs.com/ <p>@gbulmer:<br /> I am also tried test it with TPA81 thermophile array, but it doesnt work to..</p> <p>@manitou:<br /> before iam trying test it with leaf maple, i have test it with arduino nano. and its worked without any pullups on SDA and SCL. i have tried using 4k7 ohm pullups, but the result is leaf maple didnt found any i2c connected to it..</p> <p>Yes, C3088 require 5v. iam also tried using external 5V to suply the camera, but nothing i can get. but when i tried test it with arduino and c3088 suplied 3v from leaf maple it also worked. </p> http://forums.leaflabs.com/topic.php?id=9121#post-20167 Wed, 03 Oct 2012 14:39:22 +0000 manitou 20167@http://forums.leaflabs.com/ <p>do you need pullups on SDA/SCL? </p> <p>your code works for me, found an attached I2C EEPROM</p> <p>Scanning...<br /> I2C device found at address 0x50 !<br /> done</p> <p>Does your C3088 require 5v? </p> http://forums.leaflabs.com/topic.php?id=9121#post-20166 Wed, 03 Oct 2012 13:54:31 +0000 gbulmer 20166@http://forums.leaflabs.com/ <p>crowja - I am not sure what you are asking.</p> <p>Have you tried connecting a simple I2C device to the maple mini before trying to connect to the camera?<br /> For example, I use a low cost I2C 'thermometer' to check I2C is working, but anything very simple (so it can't go far wrong) and low-cost with the ability to give a different value to help testing is good enough.</p> <p>(Full disclosure: I am not a member of Leaflabs staff.) </p> http://forums.leaflabs.com/topic.php?id=9121#post-20164 Tue, 02 Oct 2012 23:03:19 +0000 crowja 20164@http://forums.leaflabs.com/ <p>I bought a mini maple leaf with the objective of making the C3088 cmos camera interface, I was having trouble with his use i2c peripherals, I connect the SDA and SCL pins of the camera module with pin sda and cells to the maple leaf mini board. I tried to test it using an algorithm which works i2c scanner to scan i2c device addresses that are connected, I scan from address 0 to 127, but the result is leaf maple find all devices of all that address. here is my i2c scanner algorithm:</p> <p>--------------------------<br /> <pre><code>#include &lt;Wire.h&gt; #define Serial SerialUSB void setup() { Wire.begin(0,1); Serial.println(&quot;\nI2C Scanner&quot;); while (!SerialUSB.available()) {} } void loop() { byte error, address; int nDevices; Serial.println(&quot;Scanning...&quot;); nDevices = 0; for(address = 0; address &lt; 128; address++ ) { // The i2c_scanner uses the return value of // the Write.endTransmisstion to see if // a device did acknowledge to the address. Wire.beginTransmission(address); error = Wire.endTransmission(); if (error == 0) { Serial.print(&quot;I2C device found at address 0x&quot;); if (address&lt;16) Serial.print(&quot;0&quot;); Serial.print(address,HEX); Serial.println(&quot; !&quot;); nDevices++; } else if (error==4) { Serial.print(&quot;Unknow error at address 0x&quot;); if (address&lt;16) Serial.print(&quot;0&quot;); Serial.println(address,HEX); } } if (nDevices == 0) Serial.println(&quot;No I2C devices found\n&quot;); else Serial.println(&quot;done\n&quot;); delay(8000); // wait 8 seconds for next scan }</code></pre> <p>--------------------------------------------</p> <p>Please help me :)</p> <p>(Edit: I added code layout markup to make it easier to read - gbulmer) </p>