Tagged Questions
2
votes
3answers
137 views
Circuit that can convert current pulses to voltage
I have an anemometer which outputs current pulses. I can't take it apart but I know there is a phototransistor and LED in parallel shining through holes to it. I was told that with 30m/s wind there ...
2
votes
2answers
103 views
Driving 3.3 V LEDs with an Arduino and a shift register
I'm planning to build a simple LED matrix with an Arduino and some 74HC595 shift registers. However my Ardiuno outputs 5 V to the registers which will pass that 5 V on. How and where along the line do ...
0
votes
1answer
105 views
Getting a incorrect voltage from a analog sensor
I'm trying to build a very simple thermometer using shift registers, 7-segment LEDs, and a LM35. The idea of the project is to learn more about shift registers and how to use them. What I've done so ...
1
vote
0answers
335 views
ACS714 5A AC Current Sensing arduino
hey guys i just got my ACS714 -5 to +5A IC i am new the current and voltage sensing i googled for tutorials on ACS714 5A but couldn't find a suitable tutorial with AC sensing.
I got the code below ...
1
vote
3answers
280 views
Common ground and voltages
Further to a question I asked earlier, I realised that common ground confuses me. I have a USB powered Arduino and a separate Battery supply. The battery supply negative is connected to the Arduino ...
2
votes
4answers
577 views
How can I drive 12v LEDs from my Arduino Nano?
Background
I am building a scale RC helicopter and ordered a bunch of 3mm LEDs to give it some nice navigation and strobe lights which I plan to drive with an Arduino Nano.
Problem is that I goofed ...
2
votes
1answer
745 views
Arduino & JY-MCU Bluetooth module
I've got a bluetooth module from dx and connected it to my Arduino UNO R3. It was working just perfect but after a couple of hours of work it just stopped sending data.
I think, the problem is with ...
0
votes
1answer
190 views
How to tell if mains voltage is on with microcontroller?
I want to be able to tell if the mains voltage is on or off with an Arduino.
How could I do this safely with minimal components (or components from Radio Shack)?
0
votes
0answers
34 views
Can I use a 12V / 2A power supply with a 12V / 1.3A motor? [duplicate]
Possible Duplicate:
Choosing power supply, how to get the voltage and current ratings?
I just ordered this motor, and the description says it was tested with a 12V / 1.3A power supply.
Now ...
2
votes
2answers
81 views
Maximum effective range of RG-6/U in CCTV
How long RG-6u i can use in my cctv? what's is the effective range using RG-6u?
1
vote
1answer
156 views
Connecting arduino to power another device
I have an arduino board which I want to use to give power to a device which uses two 1.5V batteries. I think I have to remove the batteries from the device and control the power supply via arduino, ...
1
vote
0answers
468 views
Arduino Mega run on 2 AA batteries? [closed]
I am completely new to electronics and I have a question. I read that the Arduino Mega runs on 5V and that a supply of 6-12V is recommended for stable operation of the board.
So what if I wanted to ...
0
votes
2answers
711 views
Using Vin pin on Arduino with a shield
I just bought a wifi module shield and using it with Arduino. I power Arduino (with the wifi shield on it) via USB from the PC. I need to demonstrate it without using the PC as a power supply. And I ...
1
vote
4answers
3k views
How can a Arduino (5v) power a device that operates on >12v?
Say I buy a device that requires 25 volts to function, but I want to control it using my 5v arduino. How would I go about powering/controlling higher voltage devices?
6
votes
1answer
642 views
With a uC, I can input analog voltage levels, how do I output them?
With a uC, I can input analog voltage levels, how do I output them?
I have a simple Arduino Uno R3 I had picked up, which has a few of each pin types (analog input, digital output/pwm, serial) and ...
