0
votes
1answer
20 views
Need Help: Wiring LEDs with 2 source voltages
I have a series of LEDs I would like to have display at 2 brightness levels and am confused how to properly wire this. This is for additional running lights/brake lights on my bike.
LEDs - Typical ...
0
votes
0answers
5 views
How to repair a battery?
I used this battery pack with this charger for about a month. And yesterday I've left the battery plugged into four ESCs of my quadrocopter. Today I've found the battery totally discharged. When I ...
3
votes
1answer
40 views
How to realize this transfer function with OP-AMPs?
This is a homework question.
I know that: Given a transfer function of \$H(s)\$ below, we can realize it with an OP-AMP as follows.
...
0
votes
2answers
25 views
A heat sensor that powers an LED with no controller
I'm a programmer, and I can wrap my head around having a controller board which monitors a temperature sensor llike this ...
0
votes
1answer
12 views
VHDL - Convert from binary/integer to BCD and display it on the 7-segment display
As part of my project for the Digital System Design course I have to use a component to display on the 7-segment display a INTEGER range 0 to 9999 (or a std_logic_vector(13 downto 0)). I used the ...
1
vote
1answer
59 views
Controlling the turn on/off of a 380-440V high voltage water pump
I'd like to control the turn on/off of a NFw Series Centrifugal Water Pump 380-440V high voltage water pump using an Arduino.
I have searched for how control it, but I haven't found any ideas. Can ...
-1
votes
1answer
29 views
What is a “santa cruz interface”, who created it?
There is HSMC that I have seen, but Santa Cruz just looks like regular pin header. What is so special about it? And why is the word Santa part of the name?
3
votes
1answer
50 views
Weird current at 8051 port 1 pin
The pins in Port 1 has internal pull-ups when used for input.
The Mosfet is off and the drain is pulled high using an internal pull-up resister.
I connect an ammeter and see that the current (IL ...
0
votes
1answer
9 views
gSpice: 'model is not a mosfet' error message
I'm trying to simulate a circuit. So:
I run netlist on the .sch file. It completed successfully.
I've opened the .net file ...
0
votes
0answers
11 views
Phase Angles in Series/Parallel networks. !! I'm Lost !!
INTRODUCTION:
I've been having a hard time in class trying to understand phase angles. I understand a few concepts which I've stated below for clarity in regards to this discussion.
1.) ...
2
votes
4answers
979 views
Is there a way that you can get a Portable/Online Arduino IDE?
I am just starting out with the Arduino, and I want to develop and create sketches at my school. The only problem is that the school's computer doesn't allow any application to run if app tries to ...
1
vote
0answers
13 views
Bad clock pulse on I2C EEPROM read
I am seeing a strange behaviour on an I2C waveform, and it is causing an incorrect bit to be read by the master. The master device is an ET1200 EtherCAT ASIC, and my slave is a CY8C3666LTI PSoC which ...
2
votes
1answer
23 views
common mode choke inductance question
In a common mode choke, my understanding is that common mode currents will produce fluxes that add together, which increases the effective inductance between them and so attenuating these currents.
...
2
votes
2answers
46 views
Stable voltage and current source
I want to build a simple and stable constant voltage source (voltage regulator) and current source. I built one using a LM317 but the output is not stable, it varies when temperature changes. Do you ...
1
vote
1answer
121 views
Efficiently driving 8 low-current Optocouplers
I'm looking to drive a bank of eight FOD4216 random phase triac drivers. I'm looking specifically at the (insanely expensive, $3!) Fairchild FOD4218, which needs 1.3mA to switch. 8 * 1.3 = 10.4 mA ...
1
vote
2answers
33 views
Eagle part for “MiniLED” SMT LED
I'd like to use this LED, but its package is just listed as 'MiniLED' in the datasheet. Is that a standard package, or just a Vishay term?
Is there an equivalent part already in Eagle 6? If not, ...
-3
votes
0answers
20 views
DDR2 Data Mask Pins [closed]
I saw that last year you had a problem with the data mask pins on a DRR2 memory. I was wandering if you have tested your solution connecting the DM pins to the Ground.
I would really appreciate a ...
0
votes
0answers
23 views
Xbee mesh broadcast expense
I am designing an Xbee mesh network, planned size is around 10 nodes spread around 200 square metre area. It will be a combination of nodes reporting environmental data with actuators/loggers. I ...
-4
votes
2answers
46 views
Can i directly connect this chip to PC and how can i amplify it (NRF24L01)? [closed]
Can i directly connect this chip to PC and how can i amplify it for increased range (NRF24L01)?
for more: http://www.semiconductorstore.com/cart/pc/viewPrd.asp?idproduct=765
0
votes
0answers
19 views
Verilog Netlist and verilog file not justifying each other
i generated a verilog netlist file with the help of a test case for 2-1 encoder .To test the netlist i draw the schematic diagram and try to find the output.I can't upload the pic of schematic which i ...
1
vote
0answers
41 views
Dimming USB Led Lamp
So, currently I have a project that consist in the following:
We have 2 USB Led lamps. (e.g 13 leds, 5V, ~200mA)
To these lamps, we would like to control the intensity of the light, through a ...
-1
votes
0answers
24 views
Recommendations for an FPGA that meet the listed criteria [closed]
I am looking for an FPGA + dev board that will meet the following specifications.
As I know too little of the market, I am seeking your advice for a system meet the following specifications.
Must be ...
-1
votes
1answer
60 views
Where can i find the datasheet for this component (RF2001)? [closed]
Where can I find the datasheet for this component (RF2001)?
3
votes
4answers
80 views
Using a 7 segment display to show numbers 1, 2, 3 and 4 with four inputs
I have in my car 4 LEDs which illuminate in the instrument cluster depending on the gear the vehicle is in. This is a factory standard setup which I have already run feeds from ready for the next ...
1
vote
1answer
100 views
Can I hook this breakout board up to the thing I want to measure?
I have a piece of tech that uses somewhere between 50-200mA, and I want to continuously measure the current used. To this end I have found this:
Sparkfun ACS712 breakout board
Allegro ACS712 chip ...
-1
votes
3answers
99 views
Controlling Microcontroller using Visual C# [closed]
I want to control some motors from the Microcontroller but I want to control the Microcontroller from the computer using C# or at the very least get some feedback to the computer
How can I do that ...
-8
votes
0answers
43 views
Crystal oscillator “voltage control” pin usage [closed]
What does "voltage control" mean for a crystal oscillator?
For example where a crystal oscillator marked "40 Mhz" has a control pin.
Can I use PWM to control it?
7
votes
6answers
370 views
What to look for in a multimeter?
When selecting a multimeter, what should one look for in terms of safety features and measurement capabilities?
What can you look for in the specifications to tell a good meter from a crappy one ...
3
votes
1answer
60 views
How could extension cord detection be implemented in Tesla Roadster?
Googling finds evidence that Tesla Roadster electric car can detect cases when it is plugged in via extension cord.
Specifically this page lists error codes 937 and 9 meaning "extension cord ...
4
votes
8answers
149 views
Likely places to look to find cheap sources of FPGA? Which devices should I open first?
I have a large group of new and old devices and I would like to find a FPGA to start poking around on. What products or types will be likely to have FPGAs in them?
I recently asked this question on ...
4
votes
3answers
112 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
40 views
Using a N-Mosfet to switch a common cathode ledstrip
I am trying to drive a RGB-ledstrip using the following circuit: http://learn.adafruit.com/rgb-led-strips/usage
As I am using a Common Cathode led-strip instead of a Common Anode one as used in the ...
-4
votes
1answer
35 views
How much max distance of SPI & USB & I2C and TWI(without any IC [closed]
How much max distance of SPI & USB & I2C and TWI(without any IC(my mean is directly)), and how can i amplify these?
-4
votes
0answers
32 views
Capacitor discharge [closed]
I have a 1 microFarad capacitor and the range of the capacitor is 400 V. If I apply 315 V to the capacitor how many Volts will the capacitor discharge ? How to calculate the discharge of the ...
-1
votes
2answers
27 views
value of variable in Veriog not defined
I am analyzing a verilog file for always.
in this, what should be the value of "en" in case first and then in second?
...
0
votes
1answer
38 views
Arduino Uno as a programmer for AVR chips
I am trying to make an Arduino Uno act as an external programmer for an ATmega32 and ATmega 8. I couldn't succeed, I used connections as given at Using an Arduino as an AVR ISP and Arduino Uno as an ...
-5
votes
0answers
30 views
Why sometimes i should use RS232 (or another chip for another protocols)? [closed]
Why sometimes i should use RS232(or another chip for another protocols)?
2
votes
4answers
69 views
I don't understand what are the difference between UNO and Leonardo?
I found that they sell UNO Starter kits and Leonardo Starter kits. There are many different products. My eyes are so busy. I am a greenhand. If I want to buy a stater kit, which one should I buy? UNO ...
0
votes
1answer
42 views
Help required performing Single Master - Multiple(upto 16) Slave SPI Communication using MSP430
I am planning to use MSP430F6638 for SPI Communication between a single MSP430 Master and multiple MSP430 Slaves. I am using a 4x16 Multiplexer before each Slave for providing the Chip Select Signal. ...
2
votes
2answers
28 views
ATtiny85, ARduino IDE, TinyDebug: Error sending int values
The setup:
An ATtiny85 is programmed using the Arduino IDE, it is supposed to read the ambient light from an LDR and turn on/off an LED accordingly. To get a better understanding of what my sensor ...
1
vote
1answer
31 views
AH276 hall effect sensor with microcontroller (sensor already in circuit - brushless fan)
I'm currently trying to read an AH276 hall effect sensor using an AVR microcontroller. The sensor is built-in in a brushless fan I'm using and it's operating as the fan's controller. The sensor has ...
1
vote
1answer
22 views
Measuring power consumption / current of an Arduino using a multitester
What is the correct way to measure the power consumption and / or current draw of an Arduino using a multitester?
3
votes
1answer
248 views
Zener Diode Circuit Sees Voltage without source applied
I have a circuit into an optical isolator which is used to detect the status of a contact in the field.
Zener diodes are used in series to drop the voltage to the optical isolator as well as as ...
0
votes
1answer
47 views
Need your knowledge on cameras
I have to design a system which works with a camera device. To explain briefly, I need to get image information and I need to send some information to my vision system, such as shutter speed, trigger ...
1
vote
0answers
67 views
Arduino solenoid project behaves strangely when operated on PC power supply
simulate this circuit – Schematic created using CircuitLab
I am trying to control a solenoid using an Arduino Uno. I followed instructions described in the tutorial Controlling solenoids ...
6
votes
3answers
161 views
DC DC Converters in Parallel for double current
I am using a 15V 7A DC DC converter for powering a robot. I am looking for a 15V 20A supply. For this can I put three of those regulators in parallel and expect them to provide about 20A of current? ...
0
votes
1answer
178 views
Video Composite signals
What are the considerations for PCB layout, and connector selection for video signals. Is it necessary to follow 75ohm impedance criteria in a closed system. The pipeline starts at Sony FCB IX 11 A ...
0
votes
0answers
21 views
How to match this given circuit to a model for a simulation?
I have to simulate the electric field within a gas filled discharge gap generated by a radio frequency voltage generatio. The circuit, provided to me by the experimentators somewhat far away, is given ...
3
votes
1answer
64 views
PIR sensor triggered by itself when using timer, works without timer
TL;DR
A PIR sensor is triggered by itself when using a timer to wait 2 seconds after the sensor is triggered.
Without using the timer to wait the sensor works as expected.
Background and setup
I ...
-4
votes
0answers
26 views
Can someone give me a DDR3 RAM for Dummy(ies) FPGA designers type of resource? [closed]
I want to understand how DDR3 RAM is used with a FPGA. Basically I want to know what ALL the signals on the interface do and what is required to read/write the data.
