http://forums.leaflabs.com/topic.php?id=1280 A place to share, learn, and grow... en-US Fri, 22 Jan 2016 00:14:54 +0000 http://bbpress.org/?v=1.0.2 q http://forums.leaflabs.com/search.php http://forums.leaflabs.com/topic.php?id=1280#post-7743 Tue, 17 Jan 2012 17:40:18 +0000 gbulmer 7743@http://forums.leaflabs.com/ <p>Namir - I'm glad you found it, a flashing LED was the only explanation I had based on your last post.</p> <p>poslathian - are you applying the British meaning of 'blinking' :-)<br /> If not, here is one:<br /> <a href="http://www.rapidonline.com/Electronic-Components/5mm-Flashing-LEDs-76184" rel="nofollow">http://www.rapidonline.com/Electronic-Components/5mm-Flashing-LEDs-76184</a> </p> http://forums.leaflabs.com/topic.php?id=1280#post-7739 Tue, 17 Jan 2012 17:09:59 +0000 poslathian 7739@http://forums.leaflabs.com/ <p>hmmm, a blinking LED? what is that? </p> http://forums.leaflabs.com/topic.php?id=1280#post-7735 Tue, 17 Jan 2012 16:50:44 +0000 Namir Jawdat 7735@http://forums.leaflabs.com/ <p>Hi All,<br /> I found the problem, it was not with the Maple. I was using blinking LED by mistake. Sorry for that. </p> http://forums.leaflabs.com/topic.php?id=1280#post-7731 Tue, 17 Jan 2012 16:37:55 +0000 Namir Jawdat 7731@http://forums.leaflabs.com/ <p>Hi gbulmer,<br /> Thanks for your reply and time.<br /> When I remove the jumper the on-board LED doesn’t flash.<br /> I have 1 jumper on the USB position, I don’t have any more jumpers. I did the voltage check and all the pins have 0.59V while only 1 of the USB pins has 5.03V and it is steady.<br /> And I did couple of verifications:<br /> I can program the on-board LED without any problem, make it ON, OF, blinking and changing the blinking speed.<br /> The on-board LED is connected to pin 13, so I connected an 8.2K Ohm resistor in series with an LED to pin 13. When the on-board LED is OFF the external LED is OFF which is normal, when the on-board LED is ON, the external LED is flashing!!. They are connected to the same pin.<br /> When I check the voltage on the VCC or pin 13 without load, the voltage is stable, when I put any load on the VCC or pin 13 the voltage is fluctuating.<br /> I am new to the leaflabs Maple and will appreciate any help to solve this issue. </p> http://forums.leaflabs.com/topic.php?id=1280#post-7720 Tue, 17 Jan 2012 10:50:33 +0000 gbulmer 7720@http://forums.leaflabs.com/ <p>Namir Jawdat -<br /> I can think of a few possible causes for the behaviour you are seeing. It is possible that there is a short somewhere.</p> <p>How fast does the LED flash? The flashing might be caused by the thing supplying USB power, or the regulators on the board. It is possibly the STM32F itself, but I doubt that for now.</p> <p>How many jumpers have you got in the power header?<br /> There should be only one plugged in bridging two pins (in the correct direction). For simplicity, remove all the others.</p> <p>Have you got any external voltage source? Remove that.</p> <p>Have you got anything plugged into the LiPo socket? remove that.</p> <p>Remove the LED, and all the power jumpers. So there should be nothing plugged into the Maple except the USB cable.<br /> Does the onboard power LED flash? If it does, the problem is on the board, or something the board is touching somewhere.</p> <p>Have you got a voltmeter or multi-meter This will present very little load so you can measure voltages.</p> <p>Very carefully, avoiding making a short, measure the voltage at each of the power header pins (with all the jumpers removed) compared with ground. Only one should be showing a voltage (5V at the USB power header pin). Is this voltage steady, or is it 'flashing'?</p> <p>If this voltage is 'flashing' the problem is upstream towards the USB power. If it is steady, it is downstream.</p> <p>(Full disclosure: I am not a member of LeafLabs staff) </p> http://forums.leaflabs.com/topic.php?id=1280#post-7717 Tue, 17 Jan 2012 09:57:38 +0000 Namir Jawdat 7717@http://forums.leaflabs.com/ <p>Siy, Thanks for your reply.<br /> I am powering the Maple through USB which means I am using 5V, and I am connecting an LED in series with a 10K Ohm resistor to the Vcc, which leads to less than 0.5m Amp current usage by an external circuit. And I notice that the LED is flashing ON/OFF instead of being stable ON. </p> http://forums.leaflabs.com/topic.php?id=1280#post-7711 Tue, 17 Jan 2012 04:50:14 +0000 siy 7711@http://forums.leaflabs.com/ <p>The Maple on-board regulator is quite weak and can source not so much power to external consumers. Maple r5 docs explain this in more details: <a href="http://leaflabs.com/docs/hardware/maple.html#power-regulation-on-the-maple" rel="nofollow">http://leaflabs.com/docs/hardware/maple.html#power-regulation-on-the-maple</a> </p> http://forums.leaflabs.com/topic.php?id=1280#post-7685 Mon, 16 Jan 2012 13:40:46 +0000 Namir Jawdat 7685@http://forums.leaflabs.com/ <p>I am working on a Maple r5, and I am powering it up through a USB. When I connect an LED diode to the Vcc port of the Maple, the LED starts flashing, I don’t think this is normal. And when I set an I/O port to OUTPUT, and write 1 to it, it starts flashing too.<br /> How can I get a stable output from my Maple? </p>