SparkFun Electronics Commentsurn:uuid:214d0e4e-f1b1-d287-ce26-ac5b4c9f82492024-03-28T15:28:42-06:00SparkFun ElectronicsAlex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:68b91389-4970-2578-61b3-8d343225d6312020-01-17T08:26:10-07:00<p>I think what you would want would be closer to <a href="https://www.bukalapak.com/p/elektronik/elektronik-lainnya/2pgwr7g-jual-hot-sale-handmade-hi-quality-coil-inductor-induktor-koil-0-4mh?from=omnisearch&product_owner=normal_seller&search%5Bkeywords%5D=induktor" rel="nofollow">this</a></p>
Customer #1567275 on Enginursday: How to Build a Levitating LightCustomer #1567275urn:uuid:e953a6c8-42c1-b282-4c11-0f8fd5f56b0a2020-01-17T02:00:03-07:00<p>since it's hard to find the exact specs of inductor here, can i use a toroid inductor?
https://www.bukalapak.com/p/elektronik/komponen-elektronik/84bjmh-jual-induktor-ring-coil-470-uh-3a</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:a0b2e05b-655f-619a-2df0-30a86b3e07722020-01-16T08:27:13-07:00<p>Ah ok, the inductor is the issue. When you pass current through a wire, it generates a magnetic field, the more current you can pass through the wire, the stronger the magnetic field will be. That inductor you linked has a current rating of 0.3A, and the inductor I linked has a continuous current rating of 3.6A. Here's a link to the <a href="https://www.digikey.com/product-detail/en/bourns-inc/1140-102K-RC/1140-102K-RC-ND/2534469" rel="nofollow">inductor I used</a></p>
Customer #1567275 on Enginursday: How to Build a Levitating LightCustomer #1567275urn:uuid:406216f0-82ae-3d3d-f207-64989ff7eb502020-01-15T23:01:15-07:00<p>https://images.app.goo.gl/1eWBwa143gdrzjnFA
inductor is like that</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:c22ad56b-326f-d3a7-64e3-c6e316d2468c2020-01-15T09:07:10-07:00<p>Do you have a link to the inductor you're using?</p>
Customer #1567275 on Enginursday: How to Build a Levitating LightCustomer #1567275urn:uuid:5e167f82-78c8-a6fd-341e-e2440d1418102020-01-14T17:51:23-07:00<p>i use a tiny neodymium magnet, 3x12mm. the inductor is really hot, but the magnetic field is really weak. i only feel a vibration coming out from the inductor. the inductor is really hot even though b</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:a69d660d-f2df-9642-a335-11362e765fee2020-01-13T08:50:29-07:00<p>What kind of magnet are you using and what size is it? The inductor will get warm/hot when a lot of current is running through it. The only time I noticed my inductor getting pretty warm was when I was levitating something with a bit of mass on it, like the LED and receiving coil.<p>I would suggest double checking the wiring on the comparator circuit, or even just try swapping the connections to the inputs. If the hall effect sensor output and the trim pot are wired backwards, the comparator might be sending current opposite of what you want.</p><p>It's also possible that the inductor is wired backwards and repelling instead of attracting the magnet. The last thing I would suggest trying is I noticed that with some of my stronger magnets, the magnetic field might be too strong. You could also try replacing the SS494 (+/- 42mT) with the <a href="https://www.digikey.com/product-detail/en/honeywell-sensing-and-productivity-solutions/SS496B/480-5633-ND/2561147" rel="nofollow">SS496 (+/- 84mT)</a></p></p>
Customer #1567275 on Enginursday: How to Build a Levitating LightCustomer #1567275urn:uuid:9f12ea63-ee1f-bb13-f41a-a1f375872dc52020-01-12T06:43:36-07:00<p>okay alex, i already got one more mosfet. but there's a trouble. i already followed your tutorial, it works until "the comparator circuit". but "levitating the magnet" doesnt work. i got another model of inductor, but it has the same specs, 1mH. here are the symptoms: i can feel some vibration coming out from the inductor, and the inductor is really hot, more than the mosfet. is it normal?</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:6418b5b9-c820-f645-584e-cde1f4630e9b2020-01-09T08:27:03-07:00<p>Yes, the mosfets do need to be different. The reason is with the levitation circuit, you only want to energize the inductor when the magnet is too far away from the hall effect sensor. With the wireless power circuit, you want to be constantly switching current to induce a current on the receiving coil.</p>
Customer #1567275 on Enginursday: How to Build a Levitating LightCustomer #1567275urn:uuid:64673c75-1f0c-b8e2-6c78-665d2d690ce62020-01-09T06:43:16-07:00<p>i already checked out the blog, but i got some question to discuss here. are the levitation circuit and the wireless power transfer different circuit? so do we need 2 mosfet for all circuit? or can we combine them into a circuit which only needs a mosfet?
thank you</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:6a97f45d-c91b-83f1-006d-6a6f6274d9182019-12-04T08:40:59-07:00<p>The LED is rated at 3W and the received power is about 136mW, so there's no need for a current limiting resistor. Best tip to reduce electricity bills I have is to use less electricity, and thus your bill will be lower :P</p>
Customer #1563144 on Enginursday: How to Build a Levitating LightCustomer #1563144urn:uuid:428f56c0-dd84-30aa-40c2-639fe2b38c102019-12-04T02:45:50-07:00<p>Nice blog! How much resistance do I need for an LED? and one more thing can you give me the Tips to reduce the electricity bills.</p>
Alex the Giant on Enginursday: How to Build a Levitating LightAlex the Gianturn:uuid:283268d7-ee4d-7170-ff14-721023a40b992019-11-22T08:40:40-07:00<p>I don't see why not, but from a practical side, if the light falls it's probably going to break the LED. The levitation driver could be modified to cut the current of the inductor until the magnets are in range again, but currently if the magnets fall, the current stays on to the inductor to try and pull the magnets up which draws a bunch of power and even with the small-ish inductor, it gets pretty hot with full current.</p>
Customer #537384 on Enginursday: How to Build a Levitating LightCustomer #537384urn:uuid:4bf3dfd8-f723-4a85-8d63-97e82a5f1ce82019-11-22T07:53:20-07:00<p>Could these be made larger? Say, outdoor porch light size?</p>
Customer #1560676 on Enginursday: How to Build a Levitating LightCustomer #1560676urn:uuid:b81453e8-b0f4-eac3-ab30-391e16610d4b2019-11-22T03:11:23-07:00<p>Amazing. As you have provided a tutorial too. Now people would take more interest in this and maybe they try to build it. Keep sharing such type of articles of innovations.</p>
bboyho on Enginursday: How to Build a Levitating Lightbboyhourn:uuid:88077953-afa1-726e-1ebf-b5dfc59befab2019-11-21T10:44:33-07:00<p>Yaaaaes. I saw this project a while back. It's so cool. Magic. =)</p>