Comment summary #24
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Comment 231 ... 240
| date | article | author | comment |
| 29 mei 2016 14:17:40 | Fast Lux meter | Manfred | Isn´t the output voltage always positive? So why not use an asymmetrical supply? E.g. -3.5/+8.5V. It would nearly double the possible output voltage swing. |
| 29 mei 2016 14:10:23 | Fast Lux meter | Manfred | Hi Freddy, many thanks for your fantastic projects and articles! |
| 10 mei 2016 17:38:29 | Arduino wattmeter | Patrick | @Wolfram, I didn't realize that you power the relay from within the program. Silly, because it was right there. Thanks for clearing that. And yes I am aware of the limitations of the memory. Perfect how you still managed the adjustments. Thanks. Best regards. |
| 10 mei 2016 11:03:36 | Arduino wattmeter | Freddy | @Jesso, I hope that I understand your problem correctly now: I think you mean that when measuring a circuit fed width AC-power you measure a Vmean and Imean of about 0 V and 0 A. This is exactly what you should expect. The average value of an sinusoidal waveform is zero. |
| 08 mei 2016 19:55:13 | Arduino wattmeter | Wolfram Fischer | @Patrick: Those changes are quite simple, autorange over 50V turns on a relays wich opens a shorted 10MOhm R, in the software it changes the Vdiv Value. The relays and the HI-Range LED are on Analog3 Output, used as digital out, with a bc546 transistor on it. You can see all changes in the listing! BTW: I decided to only use the 10Meg Resistor for HI Range, it is still good enough for small Voltages! So Autorange is no more, but the LEDs showing <50V and >50V. You have to be careful when adding somethings to the Listing, there is nearly no mem available! |
| 05 mei 2016 17:04:18 | Arduino: Analog measurements | ADR10 | Hi, i am using adc functions to sample data and perform an fft but after i do the analysis and obtain the values i want, i cant seem to do anything else, i am trying to activate a motor with these values, but cant seem to even get a print check to run it just keeps calculating the values over and over do i have to turn off something to get the arduino to do other functions? |
| 03 mei 2016 16:06:15 | Arduino wattmeter | Jesso | Hello Freddy! Thank you for your answer. I made the same wattmer as yours,using the code that you made and making sure to respect all the connections that you used. The problem is that when I use an AC power supply, I can have the values of Vrms and Irms on the startup but I can't have the values of Vmean and Imean. I don't know what the problem can be. If you have any suggestions please feel free to tell me. Regards, Jesso. |
| 02 mei 2016 22:53:27 | Arduino wattmeter | Freddy | Jesso, Of course you can remove the parameter calculation code when you don't need them. You can remove also the unnecessary parameters from the array's, so they don't show up in the menu. Take into account the associated values in the several array's. |
| 02 mei 2016 22:22:07 | Arduino wattmeter | Patrick | Dear Wolfram, Could you show your scheme and the changes you have made? This in regards to point 1 until 7. Best regards, Patrick |
| 26 apr 2016 09:20:56 | Arduino wattmeter | Jesso | Hello Freddy, Actually I am only inerested by the measurments on a coutinuous voltage and current. Therefore, I won't need to show all parameters at startup, such as : peak values, the phase, the charge, power... since if I keep them, they will overload the code, increase computing time and complicate the display. Thank you in advance for your answer. Regards. |