0
votes
0answers
5 views
Picking a bluetooth module
I've recently acquired a lpc1313fbd48 microcontroller and I was looking around on newark.com for a bluetooth module that I could use to connect my microcontroller with my phone. I then began to if ...
0
votes
0answers
6 views
Robotics Location Following and Tracking?
I am building a robot that will follow a target as the target moves around. I would like some help with the setup for tracking the target. The most obvious solutions are Ultrasound or Infrared ...
0
votes
0answers
6 views
How to Control SM1 Inverter Drive Frequency with Arduino?
I am back at trying to control the frequency of an SM1 AC inverter drive due to the fact that I never got it going the first time. However, this time I would like to use an Arduino. The manual for the ...
0
votes
1answer
14 views
TLC 5952 Blank pin control
Can BLANK pin of TLC5952 device be permanently connected to ground or does it need to be toggled (once at the startup or each cycle...)?
0
votes
1answer
30 views
Making a clock spin faster
I'm pretty new to electronics and hope that this is the right place to post this. I want to take a battery powered analogue clock and make the hour and minutes hands spin faster. I want to make it ...
1
vote
1answer
36 views
Is it ok to power several op amps with the same pair of 9V cells?
I'm experimenting for the first time in the wonderful world of operational amplifiers. I'm processing signals in various ways - amplify, envelope detection, voltage differences, voltage-to-current, ...
0
votes
2answers
34 views
Fix Conflicting IO Standards
I am using the Basys 2 Spartan-3E FPGA board with Xilinx. I need the pmod i/o to be at 1.8v so I am using LVCMOS18 IOSTANDARD.
You can find all of the IOSTANDARD's available for Spartan-3E in this ...
0
votes
0answers
19 views
How to install Spice models?
I've downloaded the following models for Spice:
http://www.brorson.com/gEDA/SPICE/spice-20030321.tar.gz
(Link is from here)
It is written they should be installed in the following path: ...
0
votes
0answers
23 views
Arduino solenoid project behaves strangely when operated on PC power supply
I am trying to control a solenoid using an Arduino Uno. I followed instructions described in the tutorial Controlling solenoids with arduino.
The solenoids are: first solenoid - 5 V (small), second ...
-1
votes
1answer
41 views
H.D. T.V. reception very sensitive to light switch [closed]
I have an RCA hi-def rear projection television set, about 12 years old, that I use to snag ordinary over-the-air stations. No problem. Except that whenever a light switch is turned on or off, or when ...
0
votes
0answers
11 views
Adafruit SSD1306, I2C, ATmega1284p: OLED Display askew/misaligned
Another strange problem here. The setup:
Adafruit SSD1306 OLED board connected to an ATMega1284p via I2C.
Since I "upped" my 1284 to 8MHz (which I needed to to reliably talk to my temperature ...
-3
votes
1answer
27 views
Modulation that is used in WiMAX [closed]
Which modulation is used in WiMAX? And how does it work?
I found QAM-64 but I'm not sure about that.
-1
votes
1answer
56 views
Magnets and Hard drives [closed]
A friend of mine recently told me that magnets only affect HDDs and not SSD's. Why do magnets affect HDDs and what can be done to protect HDDs from magnets?
2
votes
3answers
41 views
DC Fan Control (Switching on/off)
I'm using an MC25060V2 fan, and I'd like to switch it on and off through software occasionally (i.e. not PWM or anything fancy like that). My thought is to either put an NPN BJT or a N-channel MOSFET ...
-4
votes
1answer
65 views
can capacitor increase flow/quantity of water in water pump [closed]
can capacitor increase flow/quantity of water in water pump. we are already using capacitor of 25 uf. can water quantity be increased if we use capacitor of 30 uf or any higher which u suggest.
0
votes
1answer
61 views
Instruction Register? Whats it's purpose/how is it connected? (And what happens after)
So im learning the SAP 1 Computer Architecture. Most things I get pretty well, but from what I understand: (Lets pretend it's an 8bit and address is 4 bits and opcode is 4bit)
...
2
votes
1answer
57 views
5-bit AD converter
I just started working with AD converters and I got a trivial question about it.
In this one scenario, I have a 5-bit AD converter with a resolution of 312.5 mV. How can I calculate Vfs based on ...
7
votes
1answer
60 views
Arduino: Measure external voltage
I have a "problem" while trying to measure the external voltage from a coin cell. I have simplified my circuit, but basically I have a DS1307 real time clock powered by the Arduino 5v output, and a ...
1
vote
1answer
31 views
Raspberry Pi: driving Servo with PWM
I'm experimenting with a small servo motor with the raspberry pi using PWM (pulse-width modulation). My understanding is that the servo should respond to different length of pulse. I should be seeing ...
-2
votes
0answers
22 views
Build Environment ARM GCC stm32f2/4
You mentioned a way of setting up a ARM GCC build environment in Eclipse in this thread:
STM32F2 build environment
using:
-Eclipse IDE for C/C++ Developers
-CodeSourcery Lite (ARM processors EABI ...
-2
votes
2answers
59 views
raspberry pi + USB Hub [duplicate]
I bought a cheap USB Hub Powered to connect my Raspberry Pi and two External Seagate HD (USB 2.0/3.0), but obviously that 400 mA is not enough for all this things.
So, I want to buy a new AC Adpater ...
2
votes
2answers
59 views
DC/DC Converter minimum load?
I'm using the NTE0506MC DC/DC converter which boosts 5V to 6V. The output voltage I'm measuring with no load is 9V not 6V. In page 3 of the datasheet they mention that it needs a minimum load of 10% ...
0
votes
1answer
51 views
What is the relationship between bandwidth and noise bandwidth
What is the mathematical formulae for noise bandwidth for a 1st order low pass system (and a second order LP systems analysis if possible). What is the importance of this concept, how and when is it ...
4
votes
3answers
123 views
DC-DC converter, 12V to 400V? Is this possible?
To be able to charge a high voltage battery (~400V) from solar panels I need a dc-dc converter that can boost up the voltage from the low voltage system (~12V) to the higher voltage.
The power needed ...
-2
votes
0answers
41 views
Best option for saving energy [closed]
Which is better option among sleep, hibernate and shutdown in terms of energy saving ?
And which is better in terms of computer's life ?
0
votes
1answer
33 views
estimate SNR improvement due to filter bandwidth of low pass filter
I facing a problem in GSM simulation. I am having a perfect GMSK modulated (I can assume that GMSK filter is 200kHz or 270 kHz band limited) signal in Tx path adding AWGN of 6dB SNR (Noise 6dB below ...
3
votes
1answer
35 views
What does the RNF pin do on an H-bridge?
The H-bridge in question is a BD6212FP. Pins 7 and 8 are marked "RNF". Below is a link to the datasheet.
http://www.farnell.com/datasheets/46169.pdf
0
votes
0answers
14 views
SPI based WiFi support for SSV module DNP/9200
I am using Embedded SSV module DNP/9200 in my current project of an Ethernet gateway. I am using the TCP/IP stack by SSV with kernel 2.6. Now I want to support WiFi for this product using the ...
1
vote
1answer
51 views
Topology of solar PWM charger
I am looking into the design of the most simple (yet functional) PWM solar chargers for lead acid batteries. (Numerous examples can be found on Ebay for about 10 bucks.)
I have a hunch that they ...
-4
votes
1answer
43 views
AVR Timer1 - OCR1A [closed]
Hy.
I want to make a programm who must realize the next task : flash PORTD leds on every 2 second (2 second stay ON, 2 second stay OFF), using the OCR1A.
The frequency = 16MHz, prescaler = 256;
How ...
2
votes
1answer
38 views
find TH1 in AT89s52 micro controller in serial communication
I want to establish serial communication between an 8-bit microcontroller, AT89S52, and a PC. I am using a crystal oscillator of 8 MHz frequency. For baud rate calculation I have used the following ...
-3
votes
1answer
52 views
can applying capacitor decrease the line voltage drop [closed]
I have installed Automatic Voltage controller of 400KVA of input range 340-460V output 400V but now i am getting input of 290V and it has gone beyond the range of my Automatic Voltage Controller.
I ...
5
votes
1answer
91 views
Do solder-mount screws exist?
I have a small circuit board that has no mounting holes but does provide unpopulated test point pads. Is there any option for machine screws or standoffs that I could solder into these for mounting ...
0
votes
1answer
80 views
How data 0xFF is stored in Flash memory?
Hi i am using SST25VF032B flash memory. Before writing ,it has to be erased to 0xFF. But my doubt is that how it stores real 0xFF. Will is store 0xFF or some other value?
-1
votes
3answers
82 views
How to turn DC motor to specified angle
We have bought 2WD turtle bot with Arduino.
http://www.dfrobot.com/index.php?route=product/product&product_id=65#.UZxObIoW3RQ
Now we need to turn it to 90 angle.
We need to understand how we can ...
1
vote
3answers
76 views
NPN BJT in saturation, base voltage irrelevant?
I'm trying to build as simple a circuit as possible that will pull a logic line low every time an automotive ignition coil 'fires'. My first inclination is to simply attach the 'negative' terminal of ...
2
votes
3answers
65 views
Substitute a MOSFET in a motor controller
I'm trying to build a CoffeeBot from MAKE magazine, and I had a question about one of the components. The circuit is pretty simple; it uses an Arduino to control a gear motor via a MOSFET transistor. ...
3
votes
2answers
59 views
FPGA Logic Gate Count
I found an FPGA board that I liked. It uses a Xilinx Spartan 6 LX45. When I went to the datasheet for the Spartan 6 series, it only said that there were 43,661 logic cells. How many gates does that ...
1
vote
2answers
70 views
Why are copper pours called copper pours?
I was adding a ground plane to a PCB layout today, and my curiosity peaked. Virtually every EDA package uses the term "Copper Pour." Why is it called a copper pour? It doesn't really make sense ...
-2
votes
0answers
37 views
Limits of electromagnetic computation [closed]
How do Maxwell's equations used for calculations and electromagnetic simulation push the limits of our numerical methods and computation tools? What are the modern limitations people in the field ...
3
votes
3answers
83 views
Recommendation for ADC noise filtering?
I'm using an ADC (adc081c021) with a pretty noisy input:
There is also a 5-second video here:
http://tinypic.com/player.php?v=2ue47cm&s=5
The objective is to detect the two peaks. How could I ...
0
votes
1answer
30 views
Interfacing PSD [duplicate]
The PDF link shown below leads to the schematic for measuring the position of a laser beam by using Quadrant PSD. Do the outputs X and Y themselves indicate the position or are they needed to be ...
1
vote
2answers
64 views
Voltage Controlled Attenuator
I'm trying to create a DC voltage attenuator which linearly scales the loss relative to an applied control voltage "Vc". In other words, K = Vout/Vin is a linear function of Vc. Vin is guaranteed to ...
1
vote
1answer
58 views
Double side PCB with solder via?
Normally vias are made with through hole plating. In the past they used to make vias by soldering a piece of wire to connect the top and bottom layers (like a short piece of 24 gauge copper wire). ...
1
vote
2answers
71 views
How does this circuit multiplex an antenna between a transmitter and receiver?
I've built a Softrock RXTX kit (full schematic: pdf gif, see lower-left corner). It has one connector for one antenna used for both receive and transmit, but I don't fully understand (likely due to my ...
1
vote
1answer
60 views
Electromagnet interference with motorcycle
I just got a sport bike which the frame is aluminum the engine is aluminum the swing arm as well. Basically this bike is made up of mainly aluminum and plastics with very little steel or any other ...
0
votes
1answer
72 views
Calling ports in C on my microcontroller
I have been developing a small OS for my lpc1313fbd48. I am sending all of the C and assembly code in a binary file. I want to be able to call the ports in C and have an LED turn on for a few seconds ...
1
vote
0answers
31 views
Line down center of TFT display
I'm trying to connect a Sharp LQ070Y3DG3B TFT display to an Epson S1D13517 display controller. The test image and a bitmap that I've loaded are showing up fine, except there is a aqua line vertically ...
-5
votes
2answers
67 views
How does the 555 timer IC circuit work?
As a beginner to electronics I'm having a tough time understanding circuits that have a combination of different components, including the following timer circuit. Its based around a LM555 timer IC. I ...
1
vote
1answer
45 views
How do I control a seven segment display with a shift register and an Arduino?
I recently purchased 4 seven segment displays from sure electronics. They came with their own shift register board which combines the 74HC595 IC with the ULN2003. I want to be able to tie into this ...
