LeoR
  • Member for 8 years, 3 months
  • Last seen more than a month ago
Drawn current in industrial sensors and drivers
3 votes

The current drawn is entirely device dependent. An industrial sensor could draw less than a milliamp or it could draw tens of amps. Ditto for AC motor control circuitry. The answer is, as always, to ...

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How to connect FPGA to Xbee?
3 votes

The correct answer is, of course, "with wires". I assume you've read the WiFi module's datasheet? A quick look at the XBee website shows that their WiFi module communicates over either UART or SPI. ...

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Help me implement the crossroad traffic lights using multiplexers 4/1?
Accepted answer
4 votes

The multiplexers are being used as logic gates. In the case where just 1 or 0 is attached to the input, the multiplexers are essentially truth tables. S1 and S0 are 2 bit binary selection inputs. For ...

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1.47726744996646E-18 is this too big of a number for a variable capacitor
9 votes

1.4137449e-18, as others have said, is incredibly small. The equation given allows you to calculate the capacitor required for an LC (inductor-capacitor) circuit resonant at the given frequency. The ...

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Finding serial port on generic IP Camera PCB
1 votes

If I'm understanding you correctly you don't have the exact same camera discussed in the openipcam.com forum thread you linked? Do you know that it at least has the same chips? If they're different ...

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How to add a 5V USB output to the base of a mass-produced custom table lamp to add phone and tablet charging capabilities
Accepted answer
2 votes

A DC-DC boost converter like the ones you're seeing on eBay doesn't do what you want. It converts low voltages (1-5V) to 5V for charging devices over USB. That would be useful to charge a USB device ...

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Replace crystal earpiece in bat detector circuit
Accepted answer
2 votes

The crystal earpiece has such high impedence that it presents virtually no load to the CD4024. Normal earphones have impedence in the 16 to 32 ohm range, which would (at 9V) cause the CD4024 to ...

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Getting relative pitch and roll
5 votes

Orientation can be represented in a number of ways. In all cases you have the concept of a fixed "world" coordinate system from which your "local" coordinate system is defined. The easiest to ...

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Supply high power to mp3 device
2 votes

It's impossible to say. It may be that the board has protection devices or it may be that it doesn't. Without inspecting the device you can't really draw any conclusions. The level of damage is also ...

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What sensor should I use to determine if my project is moving?
7 votes

An accelerometer would be suitable in most cases. Technically acceleration will be 0 at a constant speed, but in practice unless your project is mounted on some sort of exceptionally low vibration ...

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Any option to upgrade library in tinycad?
1 votes

Creating your own part symbols in TinyCAD is really easy. The TinyCAD User Manul (PDF) covers it. Have a look at the section "Editing and adding symbols" on page 21. You might get lucky and find a ...

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How do I use an adjustable LDO regulator to power devices with USB that usually use AA/AAA batteries (or should I)?
Accepted answer
4 votes

The circuit as shown will work. Remember though that it's a linear regulator, which means that the voltage is dropped by turning excess energy into heat. At 4.5V the drop is small, but if you're ...

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Distributing 700W at 5V over 10m
1 votes

750W of LEDs is a lot. You'd probably need a welding mask to do anything in that room. Bear that in mind - perhaps consider setting the software to never get anywhere near maximum brightness. It's ...

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How can I adapt a 8-WFDFN Exposed Pad to a breadboard?
Accepted answer
2 votes

You'll need an 8-WFDN adapter, which is a different footprint than the SOP8/SSOP8/TSSOP8/SOIC8 footprints on the adapter you linked. Probably not easy to find - it's not a footprint commonly used by ...

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How do we charge a small 12V battery from a large 12V battery bank
2 votes

To charge a lead acid battery you need more than 12V. Any charger would be a combination of a DC-DC boost converter and some circuitry to control the charge current. Probably the easiest off-the-...

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Can a 9v battery be substituted with an array of LiIon 3.7v?
3 votes

The answer depends quite a lot on the device you're powering. Many modern electronics use a linear voltage regulator which provides the operating voltage from the input voltage. This type of device ...

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Arduino UNO R3. IDE Error-Not in sync. TX shorted to 5v?
1 votes

The Arduino IDE is often quite buggy and sometimes closing it down and opening it again can fix programming errors. Assuming you've done that, you made the comment "I powered it up from the 5V pin". ...

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How do I solder a LED in place of an earphone?
Accepted answer
4 votes

I think you're asking the wrong question. What you evidently want to do (as suggested by your previous, now closed, question) is light up an LED over bluetooth. Connecting an LED to the audio output ...

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Detecting and identifying different light sources in arduino?
1 votes

Have you considered using a number of light intensity sensors (type doesn't really matter), each with a different coloured filter over them? A few different colours from different parts of the ...

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Why is my simple counter VHDL not working? Where did my signals go?
Accepted answer
6 votes

the rising_edge() parameter is only really for clock signals. One option would be the following: clk_proc: process( clk, switch1, switch0 ) begin if switch1 = '1' then counter <= ( ...

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Will RF cause any health problem?
Accepted answer
10 votes

There are two actions through which electromagnetic radiation can cause health problems. If the radiation is ionising (ie has a high enough energy to liberate electrons from their atoms) then it has ...

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Using the PS/2 port of the Papilio One FPGA from VHDL
1 votes

PS/2 uses a 10 KHz clock, so connecting an LED to the clock or data lines will just result in the LED appearing always on at a brightness corresponding to the signal duty cycle. Have you tried ...

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When can FPGA's be used and Microcontrollers/DSPs not?
6 votes

We build radar instruments (mostly synthetic aperture) which use FPGAs extensively. I don't think the tight timing requirements could be met by a microcontroller easily. I believe that a lot of LIDAR ...

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VHDL--counter for 7 segment display
Accepted answer
3 votes

The first issue I can see is that you're using a "std_logic_vector" type for your counter. You can't increment a std_logic_vector type, and so the "+" operator you're using will be doing weird things. ...

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