The Godfather talking
You think I am funny guy huh?
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May 14, 2021, 11:35:48 11:35


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 31 
 on: May 05, 2021, 06:00:29 18:00 
Started by zac - Last post by Sideshow Bob
Have you tried google something like RMS circuit. If your source is a low frequency good sinewave. The circuit can bee quite simple. You can also google rue RMS To DC Converte. It is some ICs that can do all the job for you. If you use a transformer It can both insure safety but also be used to power your circuit. Do some work on google. Find some circuits alternatives. When you can come back with questions regarding the latter circuits. It is more easy to help that way

 32 
 on: May 05, 2021, 03:10:43 15:10 
Started by zac - Last post by zac
you have a generator, so putting a meter to check the Voltage/Amprage is wasting power?
The device you want to use is a non-contact meter,
it still needs power to use, as does the wireless device.
you need to evaluate what your trying to achieve.

I was trying to find a more elegant way to do it besides using a rectifier/capacitor and resistive divider.  Transformer instead of a divider would work too, but hard to come by a 1.414:1 ratio off the shelf.  I don't want to spend days or weeks on this project which is why I selected an off the shelf device to accomplish most of what I wanted.  I just thought perhaps someone had a simple idea that I overlooked to generate the DC equivalent of and rms AC voltage.    


 33 
 on: May 05, 2021, 09:58:59 09:58 
Started by zac - Last post by Johnny
Hey Zac,
might be easier to find something else or try rolling your own solution than to try adapt that one to do what you want.

If you're open to other solutions:
  • Maybe look at energy monitors (the ones you plug into your power outlet). A lot of these will display voltage also. There are wireless models out there.
    Similar to this maybe? https://www.ebay.com/itm/402019637726
  • Wireless multimeters? Although would have to find one that doesn't switch itself off. Might struggle with that.

Failing that:
If all you want to do is read the voltage, convert to RMS, and transmit it wirelessly to be displayed somewhere else, you could design your own system; wouldn't be too hard, not a quick fix though.

E.g. AC Voltage -> (Maybe a transformer to bring voltage down to safer level or isolation) -> Bridge Rectifier -> Smoothing -> Voltage Divider (set to say 3V3 at max Vin) -> Over Voltage Protection -> Op-amp/Buffer (for low impedance) -> ADC (PIC/arduino/or similar) -> Convert Value to Volts -> Apply Software Calibration -> Convert to RMS -> Send Over Wireless -> Display.

You could use an NRF52832/ESP8266/ESP32 for bluetooth or wifi and read the voltage from your phone/tablet/computer if you like, or use some sort of display like an OLED or character display.

Don't attempt this if you're not used to or confident working with mains voltage though.

 34 
 on: May 05, 2021, 09:47:37 09:47 
Started by zac - Last post by Sideshow Bob
It is hard to say very much based on the information you have given us. As we are not sitting beside you at your workbench. Posting things like any schematic or PDF files would be very helpful. It is up tou you, the ball is in your court

 35 
 on: May 05, 2021, 09:16:49 09:16 
Started by zac - Last post by pickit2
you have a generator, so putting a meter to check the Voltage/Amprage is wasting power?
The device you want to use is a non-contact meter,
it still needs power to use, as does the wireless device.
you need to evaluate what your trying to achieve.

 36 
 on: May 05, 2021, 08:05:01 08:05 
Started by zac - Last post by Sideshow Bob
Have looked at using a transformer?

 37 
 on: May 05, 2021, 06:17:47 06:17 
Started by sudni - Last post by CortexM0Inside
Hi all, I use probe Stlink v2 convert in J-link to debug Pico Pi (raspberry Pi pico) and it doesn't work! Embarrassed
Now I am tempted to purchase a Jlink v8 probe for debugging Pico Pi, but I have a doubt. Lips sealed

Is there anyone among you who has already used this probe to debug this card?
Thanks for your help,
Paul.


Try with my JLink BluePill R0 and JLink Software V7.xx, It should work.
http://www.sonsivri.to/forum/index.php?topic=69113.0

 38 
 on: May 05, 2021, 01:43:43 01:43 
Started by zac - Last post by zac
What is the easiest way to create a DC voltage that is the rms value of an AC voltage?  I'm putting together a remote wireless voltage monitor for a generator from this:

https://www.ebay.com/itm/274617207090

The module will accept an input of up to 500V DC.  If I use a rectifier and capacitor, I would get root 2 (1.414x) times the rms value and could use a resistive divider to get the correct value.  But, that would waste electricity (even a 100K pot would dissipate 0.14 watts @ 120 VAC) and input impedance of this device may not be that high and require a lower resistance divider for decent accuracy. 

PS.  These device use a nRF24L01 based 2.4 ghz radio module which can be a swapped with a drop-in replacement version that includes a bidrectional rf amp to increase range.  (search for NRF24L01+PA+LNA)


 39 
 on: May 04, 2021, 06:16:06 18:16 
Started by Kate sander - Last post by Kate sander
CountryNC
NoteI like Candy

 40 
 on: May 04, 2021, 04:44:26 04:44 
Started by madhan7710 - Last post by madhan7710
Does any one have datasheet for the gps chip SIRF GSD4e? Kindly share.
Thanks in advance.

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