betwixt
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Yesterday, 21:30You can't connect USB directly, the 80C51 does not have the necessary hardware to talk to a USB interface. The simplest method is to get hold of an...1 replies | 43 view(s)
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Yesterday, 21:25There are many different models of Crydom SSR. The ones I use employ an opto-coupler driving back-to back SCRs so they mimic a Triac. Being for AC...2 replies | 45 view(s)
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Yesterday, 21:22betwixt replied to a thread Can this scheme be used to control multiple solenoids in Analog Circuit DesignYou don't really need D2 but if the solenoids are widely spaced it would be advisable to connect a diode (like D1) across each individually. If the...8 replies | 95 view(s)
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Yesterday, 19:46Probably the easiest method then is to use FTP (File Transfer Protocol). Just run a suitable FTP client at both ends and enable file sharing if...3 replies | 105 view(s)
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Yesterday, 19:41betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsWhen being used to switch inductive loads, yes that's true. Remember that unlike a normal transistor they work on AC and require the trigger...32 replies | 477 view(s)
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Yesterday, 13:13I think your problem is you put "Writing" in a file called "testing.txt" but then read it back from a file called "testing.csv". You are trying to...8 replies | 153 view(s)
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Yesterday, 13:10You posted in the "Digital Design and Embedded Programming" section so is this a custom device you are talking about or do you want a data transfer...3 replies | 105 view(s)
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Yesterday, 13:07I would guess your problem is therefore that the signals are inverted. With no segments in the data you get them all turned on instead of turned off....20 replies | 368 view(s)
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Yesterday, 12:59betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsThat particular datasheet doesn't mention the load but it does imply it is unsuitable for your application. Look right in the middle of Page 5:...32 replies | 477 view(s)
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Yesterday, 08:48betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsMy MOC302x series data sheet does not quote a triac current but does say: "NOTE: This optoisolator should not be used to drive a load directly. It...32 replies | 477 view(s)
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Yesterday, 08:37We still only have a small part of the code to work from and we do not know how the '373 is connected in relation to the display. We will however...20 replies | 368 view(s)
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22nd October 2018, 20:50betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsThe opto-triacs are exactly what I meant - BUT - they are not intended to directly control the load and should not be used that way. Look at the...32 replies | 477 view(s)
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22nd October 2018, 20:43betwixt replied to a thread [SOLVED] I have this diode that i need to know it's number in Hobby Circuits and Small Projects ProblemsProbably made in an Asian country where they read right to left :) Brian.4 replies | 172 view(s)
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22nd October 2018, 15:29This takes us full circle. The code seems better now but as mentioned as far back as post #2, unless you also tell it which digit is being...20 replies | 368 view(s)
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22nd October 2018, 15:21betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsConnecting the two circuits together (AC and DC) is not impossible but you have to be extremely careful with current paths and consider what happens...32 replies | 477 view(s)
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22nd October 2018, 15:12I'm with Paulfjujo on this one. If the file is simply a long list of comma separated numbers it might be better to read it byte by byte and look...8 replies | 153 view(s)
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22nd October 2018, 13:41Please show your new code so we can see it's current version. A schematic of your connection to the segments would also help. Brian.20 replies | 368 view(s)
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22nd October 2018, 13:40betwixt replied to a thread Using a triac MAC97A with Arduino in Hobby Circuits and Small Projects ProblemsThe simplest drawing tool is probably FidoCadJ which is written in Java and runs on most platforms. In my opinion it doesn't come close to the...32 replies | 477 view(s)
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22nd October 2018, 09:50betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsYes, the values are not critical. The 10K for pull-up/pull-down resistors is just a 'ball park' value, you can safely use anything up to about 100K...49 replies | 1405 view(s)
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22nd October 2018, 09:43A faster crystal probably wont help. The most likely problem is the way you initialize the UART. Normally the bit rate (Baud rate) is generated by...20 replies | 368 view(s)
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22nd October 2018, 09:24betwixt replied to a thread [SOLVED] I have this diode that i need to know it's number in Hobby Circuits and Small Projects ProblemsI would say it's a 1N4148, probably the most common small signal diode in the World. yellow, brown, yellow, gray = 4148. Brian.4 replies | 172 view(s)
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22nd October 2018, 09:21I don't understand your question. Do you mean you want to convert 8 bits arriving one at a time into a byte? If that is what you want, either use a...3 replies | 132 view(s)
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22nd October 2018, 09:17betwixt replied to a thread What does the transistor do in the attached circuit? in Power ElectronicsThe circuit (which should have the capacitor mentioned by Klaus) is to produce two stabilized voltages. They make sure those voltages stay constant...11 replies | 272 view(s)
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21st October 2018, 23:49betwixt replied to a thread What does the transistor do in the attached circuit? in Power ElectronicsI wouldn't remove them, they are voltage followers in apart of a regulator circuit. Brian.11 replies | 272 view(s)
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21st October 2018, 21:26I think your original error is because there is no way to tell which digit is being sent, there is no sync between the two ends. I assume you have...20 replies | 368 view(s)
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21st October 2018, 20:29You need to expand it slightly, at the moment you are transferring the segments as a single byte, that works fine for one digit as you have seen. You...20 replies | 368 view(s)
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21st October 2018, 20:18betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsNow you can see why multiplexing was invented! Although not applicable in your design, it would allow the whole thing to be reduced to a hand full...49 replies | 1405 view(s)
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21st October 2018, 16:33betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsWell done! Removing the wire from the switch and touching again should do exactly the same as operating the switch, in both cases you break or make...49 replies | 1405 view(s)
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21st October 2018, 15:59betwixt replied to a thread Help re-creating a replica movie prop in Hobby Circuits and Small Projects ProblemsIt should be like this: Thumbwheel 'common' goes to supply. Thumbwheel 'outputs' go in parallel to the same data input pin across all 4511s at...49 replies | 1405 view(s)
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21st October 2018, 09:14Look at the actual value in CONFIG4. The data sheet and the comments in your program do not match. If the LVP bit is 'OFF' RA3 should be a digital...8 replies | 245 view(s)
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PLEASE - no friends requests or private emails, I simply don't have time to reply to them all.
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