Use this tag to refer to the volume of electricity traveling through any given wire at any given time. It is measured in amps.
0
votes
1answer
12 views
How to measure relay current draw from Ardiuno
How does one measure the amount of current a relay is drawing from an Arduino?
Do I connect a multimeter in series with the digital pin to which the the relay 'IN1' is connected (in this case pin ...
0
votes
2answers
33 views
Circuit doesn't work when multimeter/current meter is attached
I'm working on a battery-powered data logger, using a bare Atmega 328. I'm using sleep between sensor readings, via the Narcoleptic library. Everything seems to work fine, until I connect my ...
0
votes
1answer
18 views
How much voltage/current do I need for multiple chips?
I have a Huzzah ESP826 Wifi breakout chip which requires 3.3V power voltage and peaks at 500mA of current, and an LED strip which requires 12V and 1A. How can I power both with one dc jack (I have a ...
0
votes
1answer
40 views
Powering multiple servos on external battery
I am working on a project with my school's 3D Printing Club where we are making a humanoid robot and I am attempting to wire the arm at the moment, and program the hands to translate text to sign ...
0
votes
1answer
22 views
how much current does Arduino Nano draw when only using 8 digital pins?
I want to connect an Arduino Nano to an Intel Minnowboard Max (it's like a Raspberry Pi). I know Arduino can draw up to 500 mA current through the USB connection. Since I already need the USB to ...
2
votes
2answers
62 views
Deviation of power consumption between datasheet and real world?
According to the Atmega328P-PU Datasheet (side: 589) the current consumption of the microcontroller should be around 9.5mA (at 16MHz and 5V).
But I measured 15mA. (Nick Gammon who did some pretty good ...
1
vote
1answer
31 views
ACS712 inacurrate reading. Wild jumping
I'm trying to use my 30A ACS712 on my OSD (it has ATMEGA16L).
But it is very unstable, 0 amps goes from 450 to 445, but that isn't that bad, but when I put 10A of current through it jumps from 440 ...
0
votes
1answer
88 views
How to connect this motor driver board to Arduino to drive bidirectional motor?
I am familiar with using PWM on Arduino and have done so with simple 3-pin interfaces: e.g. PWM, DIR (direction) and GND pins. Choose a direction with DIR, set speed with PWM in software (0 - 255), ...
2
votes
1answer
94 views
How to calculate voltage?
I want to check each cell voltage using arduino.
and how to calculate dc current using CT Sensor using Arduino?
0
votes
0answers
22 views
Attiny88 problem with LEDs and voltage
I have the following problem and wonder if anyone may have some inside into what may be happening.
I have an array of 20 leds that i manage to multiplex using the attiny88 using only 9 pins (4 ...
3
votes
1answer
90 views
Which device to use to measure AC current using Arduino?
I'm building a home automation product and want to measure AC current using Arduino (as of now). I've used ACS712 5A Hall Effect Current module but there's a lot of electrical noise and also the ...
0
votes
0answers
62 views
ACS712 to build doorbell sensor - Arduino Hangs up
I have a ACS712 module that I am connecting to my Arduino Uno to read the current spike when my door bells rings (and then trigger some events in my "sketch").
In my country doorbells use the ~115 ...
1
vote
1answer
42 views
What is Reverse Current through an Arduino?
Can someone explain (in a non-wiki technical way) what reverse current is through an Arduino ? Cheers y'all
0
votes
1answer
59 views
Powering a 6-12V motor using a lead acid 6V battery with 6Amps of current?
Hi I'm using a adafruit motor shield v2 and I need to power a DC motor 6-12V but I'm not sure if my battery will be okay for the shield. Will it burn the shield? I'm going to be using 6V so it should ...
0
votes
2answers
62 views
PYM-1 PIR sensor current concerns
I am busy toying with some PIR sensors to detect movement etc for a nightlight for my kids. One of the sensors I ordered is the PYM-1 PIR sensor.
The data sheet states the following:
Operating ...
0
votes
2answers
115 views
Controlling a 240v AC high current relay
Should I use 2 relays, one for the hot wire and one for the neutral ?
I'm talking about 16A.
0
votes
2answers
28 views
calculating the input current
I have been a bit confused about calculating the input current, so I'd be much obliged if someone could help.
Let's say that we have a potentiometer connected with an analog input as shown below. In ...
1
vote
2answers
36 views
ATMega I/O maximum current
According to the ATmega328P datasheet, the total current from all I/O pins must not exceed 200mA.
Let's say that an Output pin sources 30mA and an Input pin sinks 10mA. The total current should be ...
0
votes
0answers
50 views
Arduino-controlled current limiter for lathe
I'm building a lathe that will be powered by a 3-phase 750w AC motor (4 pole, max unloaded RPM of 1400 RPM). I want to be able to control the RPM using a potentiometer attached to an Arduino mega ...
2
votes
1answer
122 views
Using Arduino Micro With 12V Buzzer
I have an interesting situation. I wonder if anyone can help?
I have:
4x Arduino Micros loaded with the basic Blink sketch
5x 12 volt buzzers
A desk full of completely fresh Duracell AA and 9v ...
1
vote
2answers
173 views
Can I measure the current (mA) of my project with just a multi meter?
I have a project and wish to choose the correct battery back for it such that it will last the required amount of time between each recharge of the battery pack. I am using an Arduino Duemilanove with ...
0
votes
1answer
2k views
How to convert the 0-5V to a 4-20mA current loop?
I'm pretty clueless about electronics so everything has to be explained in simple terms to me.
I have an Arduino with a program which provides a value via the Analog output, so that is anything from ...
0
votes
0answers
47 views
Can I use relays with 10A125V~ for my 220V~ applications, safely?
I am using the TinkerKit Relay Module and recently they changed the relay mounted on the board from a white one with 10A250V~ to a black one with 10A125V~.
In my country the voltage is 220V~. Can I ...
0
votes
1answer
112 views
How to choose between Lithium-ion vs NiMH batteries to power Arduino on the go.
For my next project I'd like to use a battery pack to power my Arduino.
I would also like to get a small solar panel and charging module to charge these batteries when possible (during the day).
...
0
votes
5answers
380 views
Measure total microcontroller current?
So I have a Duemilanove board and am utilizing 7 output pins, I power a Pixy camera and pan/tilt servos from the ICSP header, i also power an HC-SR04 sonar snsor directly from the board.
Of those 7 ...
1
vote
2answers
361 views
How can I increase resolution for current sensor?
I purchased a ACS711 Hall effect-based linear current sensor (http://www.pololu.com/product/2197) and when i read the input it's basically always the same. After doing some research I think it's ...
2
votes
1answer
79 views
Discrete H-Bridge very low current output
I have built two parallel H-bridges from "Design 1" on this page as you can see in the attached schematic.
However when I apply the external power (VCC1 in the center of the diagram) the two motors ...
3
votes
1answer
199 views
PWM signaling with Arduinos: What is the reason for the ground connection?
This may sound like a very dumb question and I apologise in advance.
I've gone through reading about PWM and working on some example sketches to control PC fan speeds using PWM and Arduino.
In all ...
-2
votes
1answer
85 views
Infrared led and sensor: how it work [closed]
I am having a difficult time to understand how an infrared sensor and led work. I have an infrared LED (like the ones you buy anywhere), does it mean that the infrared LED has the frequency os 38khz?
...
0
votes
1answer
41 views
How an input analogic pin work
I have a potentiometer of 10k and I connected it this way:
5v -> potentiometer -> analogic input pin of arduino
When I turn the potentiometer I change the resistance of the circuit but in the ...
0
votes
1answer
63 views
How much current and voltage has my resistor + LED
I have a very simple circuit: 5v -> LED (5mm, forward voltage of 2 V and max. current of 20mA) -> 1k ohm resistor -> GND.
I want to know how much current is flowing in my circuit. I am using this ...
0
votes
1answer
802 views
SD Card shield and TCRT5000 sensor aren't working together on arduino uno
I need to work with SD card and TCRT5000 sensor (Reflective Optical Sensor with Transistor Output) and save data from sensor to file. So I select Arduino Uno and added to it a SD card shield(from LC ...
0
votes
2answers
1k views
How do voltage and resistance work for two 5v servos when using an external 12v power supply?
I have a 12v/1.5 amp barrel plug power supply on my Arduino Uno. I have two servos that say they are rated for 4.8v to 6v, but no amps are specified. When my circuit is configured as it is in this ...
0
votes
1answer
509 views
Minimum current or power for Arduino Mega
I wanted to use the cigarette lighter receptacle of a car as the power supply for the Arduino Mega. From 12 V, I will convert it to a 7 V supply, but my problem is, what must be the minimum ...
1
vote
2answers
86 views
May arduino hang when current is changing over time?
As in title. I've got quadrocopter where Li-Po is parallely connected to motors as well as to arduino. May current driftage cause arduino hangs ?
0
votes
2answers
344 views
Measure low current with variable voltage
I want to make a system that always have the same current (about 1ma) in a water with silver electrode. At start it will be purified water so conductivity will be really low.
But with time silver ...
0
votes
1answer
227 views
Arduino gets stuck: battery powered, wireless, dc motor drive
I have a Arduino Mega 2560 connected to
L293D Motor Driver IC connected to two small size dc motors.
MPU-9150 using i2c
Xbee v1.1 arduino shield by seeed
Li-po battery, 7.4 volts, 2200 mah.
...
1
vote
2answers
59 views
Maximum Current?
This is an extremely noobie question, but I have a 5V at 2A power source. This power source is going to be powering 6 Sharp IR distance sensors(20-150cm) and a few other low current consumption ...
-2
votes
3answers
574 views
Does Arduino run AC or DC
Does arduino run AC or DC? Based on my small knowledge on the crystal in an arduino, it seems like AC makes sense. True? No?
2
votes
1answer
1k views
Do I need to use a resistor if I am using a potentiometer to control an LED's brightness?
I am currently tinkering with an arduino, and am using a potentiometer to change the brightness of an LED.
I understand that usually, a resistor is added to the circuit to limit the current flowing ...
1
vote
1answer
121 views
Does the square-wave nature of PWM dictate how much resistance you need?
I think the answer is yes, but I wanted to ask the question anyway for future common reference. And to check my understanding.
Say I want to power 10 LEDs with PWM with my Mega 2560. I have a bunch ...
1
vote
1answer
187 views
digital pin's current limit, ohm's law and DC motor
A digital pin's output voltage on an UNO board is 5V, which is equal to the output from the VCC. I read that the DC current limits of those pins are 40mA and 200mA respectively, and that a higher ...
1
vote
1answer
79 views
Measuring resistance conceptually and in code?
How would I measure resistance over a certain length? In this case the resistance is variable.
What I have in my head is that you would output a certain amount of current from one pin, and measure ...
7
votes
1answer
4k views
A digital I/O pin as ground
I want an I/O pin to return current in a circuit, similarly to the function of ground.
Which of these will achieve what I require?
pinMode(pinnumber, OUTPUT)
digitalWrite(pinnumber, LOW)
or
...
6
votes
2answers
3k views
Is there a limit on how much current a pin can sink?
I've been experimenting with an 8x8 LED matrix controlled by an Arduino Uno. As I think is typical, the matrix uses a common anode for each row, and a common cathode for each column.
At the moment, ...
