Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
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2 views
Arduino - Beginner Question
Question
As far as I know each I/O pin has to keep around 20mA, what are the consequences of going higher or lower? But if I am using all I/O pins is there a maximum current value I should keep in ...
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0answers
7 views
Remote temperature sensor system without slave board [migrated]
I want to build a temperature control network over my house reading data from each room and sending it to the main board for further processing. I need about 6 sensor nodes sending the data over the ...
0
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0answers
35 views
Is it safe to frequently restart an ATX power supply
I'm powering five Arduinos and four LED strips (600 LEDs total) from an ATX power supply (CoolerMaster B2 Series 700W). Four Arduinos drive the four LED strips, and the fifth Arduino periodically ...
-1
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0answers
25 views
I want a 32V, 5A current through the LED in 15 us pluse [on hold]
I want to give a 15 us pulse to my LED whose drive voltage should be 32V and current should be 5A.
I used Arduino MEGA2650 to generate a signal and MAX16818evkit to drive another LED. However, ...
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0answers
6 views
Brushed Dc Motor Control with Arduıno Motor Shield [migrated]
I included in wind turbine project and they want from me to control Brushed DC motor with Arduino Motor Shield.Than,supply 12 volt battery.However, with respect to my research I can not correct the ...
-1
votes
0answers
17 views
How to connect many PIR, LDR sensors with Arduino?
I am trying to implement a project that will sense motion of vehicles on the street and turn on the lamps accordingly. An LDR on the top of a lamp will sense if there is still daylight and another LDR ...
-3
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0answers
14 views
Arduino + XL6009 Buck Booster + Servo [on hold]
I have an Arduino Uno board, an XL6009 DC-DC voltage booster, a powerbank 2a output 5v and a servo motor.
When I run the servo motor from powerbank it is working, but I want 7.1V, so I bought a ...
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2answers
49 views
Arduino - Calculating Resistor's Power and Resistance
My Question
I know, for example, that using a LED in Arduino without a resistor would cause damages to the Arduino's I/O (damages the LED too?), right? Resistors as far as I know have the two main ...
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4answers
46 views
Nyquist theory for sampling data from TMP36
Is there any way to make sure that sampling temperature(voltage) using arduiono UNO from TMP36 sensor does not violate Nyquist theory?
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0answers
21 views
Can ESP8266 connect to Wi-Fi network that requires not only SSID and password but also username and password?
Can ESP8266 connect to Wi-Fi network that requires not only SSID and password but also username and password?
It's not about web captive portal. It's about a popup that appears in Windows when you ...
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2answers
32 views
decode the data of TWO RF transmitter transmitting simuletanously [on hold]
i am using 433MHz RF receiver and transmitter. i am facing the problem in receiving the data while TWO RF transmitter's are transmitting data at a same time.i am using ARDUINO UNO for decode the ...
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votes
1answer
56 views
Use one power source for two atmega chips
I'm working on a big project recently that requires 2 atmega chips one to handle input midi signals and one to transmit output midi signals. Because of the complexity of the project I cannot use one ...
1
vote
1answer
33 views
Whats the highest voltage dc motor that my mosfet can control?
I am using a IRF520N Logic level mosfet to control a dc motor with my Arduiono Uno. What types of DC Motors (i.e 20-24V) can I use without damaging the mosfet?
Datasheet: http://pdf1.alldatasheet.com/...
-1
votes
1answer
38 views
Correct circuit for photodiode with an Arduino [on hold]
For a university project, I have to use this photodiode.
I've tried following two circuits for a photodiode that I found here on the site. How to Use SFH235 IR Photodiode Correctly?
However, the ...
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0answers
18 views
Re-enable Arduino after short [migrated]
I happened to short-circuit my Arduino by mistake. It was powered by USB on my Windows 7. The OS was so smart to pop-up warning about USB power surge and shut it down immediately. Arduino survived.
I ...
0
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0answers
38 views
What is the best iPad / iPhone method to control home automation projects? [on hold]
I am struggling to figure out the best "app" for IOS to control a lot of projects I want to create. I can do all the Arduino programming and all the wiring, with no problem. I have done a little ...
0
votes
1answer
117 views
Is my schematics correct? (Atmega328p for solenoids control)
Finally I finished the second version of my circuit which should control different solenoids.
You can view the large version here.
In particular, this circuit should control 2 proportional solenoids ...
0
votes
1answer
51 views
measuring AC rms voltage of TMP36 using TDS Tektronix 2002C digital oscilloscope
When measuring AC rms volt of TMP36 temperature sensor by TDS Tektronix 2002C digital oscilloscope, I got value of 5.97mV.What's the absolute error in my measurement (absolute error from oscilloscope )...
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0answers
30 views
Gain factor in Fast Fourier Transform (FFT)
I am trying to develop a system for bioimpedance measurement, using this project to support me:
http://www.instructables.com/id/Body-Composition-using-BIA/?ALLSTEPS
I'm using Arduino UNO and other ...
-1
votes
0answers
21 views
AD8232 3 lead LA RA LF [on hold]
for a project I bought a AD8232 to have L1, L2, L3 derivation. Unfortunately, I manage to have just one lead with a graph on processing. So I would like to change the RL electrodes to have RA ...
-1
votes
0answers
44 views
5v DC 10 amp power supply with 2.4 min amp draw from digital LED lights
So my question what is the run time for a 5V 10amp DC power supply if the set of lights draws approximately 2.4 min amps?
This i got using formula: (# of pixels x 20) ÷ 1000 = min amps
However i ...
0
votes
1answer
55 views
Is my relay working properly?
I have 4 relay module originally created for Arduino (it looks very close to the image below) and I am little confused with the way how it works.
There are 6 pins ins this relay:
GND
IN1
IN2
IN3
...
2
votes
2answers
275 views
Can I safely toggle the CS pin without sending any data?
Update: I've tried the solution I proposed in comments in practice (utilizing E pin on the 138 IC during changing target device) and it did indeed work. Read the whole thing if you want more details.
...
-1
votes
1answer
69 views
Electrical Code issues with light switches and Arduinos [on hold]
Are there any electrical code issues with placing an electronic circuit inside the light switch box of a house?
I am planning on adding a WIFI (8266) and relay control to a light switch.
Does anyone ...
-7
votes
0answers
44 views
how to Write program by arduino to make 8 LEDs blink in a sequence, in two direction against them [closed]
please help me , how to Write program by arduino to make 8 LEDs blink in a sequence, in two direction against them. The program will turn on two LEDs in the same time one from left and the other from ...
-3
votes
0answers
41 views
Detecting if door or window is opened or closed [closed]
I need a procedure to find out if a window is opened or closed and to have it send a text every 5 min that the door or window is opened using Arduino. I would prefer to use a proximity sensor. I am a ...
-4
votes
0answers
25 views
ADXL 345 Movement over Surface [closed]
I am working with accelerometer ADXL345 place at over my hand
so i am trying to catch the movement of the hand over a flat surface :3
HELP PLEASE.
-2
votes
0answers
42 views
Power an arduino on a 12V circuit [migrated]
I am doing a simple circuit with a 12V power supply to power a 12V led strip. I'd like to be able to switch ON/OFF the strip with a relay connected to my arduino. I'd like to know if i can directly ...
-1
votes
1answer
50 views
Cost effective way to communicate data between a force resistor and a raspberry pi / Arduino
I am looking for a cost effective way to communicate data between a force sensitive resistor FSR402 to a raspberry pi/Arduino wirelessly. I am open to using BLE / WiFi / Radio Communication.
The ...
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votes
3answers
46 views
Mosfet as switch Arduino 36V 1.5A
I am a bit confused with Vgs meaning.
Vgs threshold should be <5V <40 mA because the Arduino cannot supply more.
In the datasheet it says that the Vgs is +-18V and the Vgs threshold 1-2.5V. ...
-4
votes
0answers
38 views
Unmanned surface vehicle [closed]
I will make usv but i couldnt decide how can ı set comminucation system
Could you give me suggestions
Note :ı will use it on oceans
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votes
1answer
55 views
Sinusoidal PWM running BLDC motor in open loop
I have started to wokr on the stabilization of a single axes gimbal using an Arduino and a BLDC sensorless motor.
I've read many example about this topic, but I have a question about the usage of the ...
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0answers
46 views
isolate two curciut arduino
i have 2 small circuit to measure EC and PH of a solution.
unfortunately the noise make read not good if both circuit it's connected.
they have 3 pin each (vcc, gnd, gpio)
if i add a gpio for turn ...
-3
votes
1answer
71 views
H brige with LM324N [closed]
I am trying to make a quartz movement run off an arduino and I can't seem to get the alternating +/- voltage right.
If I am not mistaken, this should be doable with a LM324N chip, but I don't ...
1
vote
1answer
29 views
Arduino Problem receiving audio from android phone
I'm new to this Arduino DSP stuff, but I've read articles on how to make a music visualizer from various sites.
I've decided to route audio output from phone's 3.5mm left channel to arduino analog a0(...
0
votes
1answer
26 views
Arduino buzzer resistor requirements
I am currently using pin 13 and the ground pin to connect an old salvaged buzzer from an old stationary phone. Also I am using this command to power it's tone(13, 59, 30000).
Does this have the ...
1
vote
1answer
50 views
Measure an engine valve lift in a fixture
I work in a company which manufactures engine valves and we have a rig in which valves can be tested for endurance. The fixture in the rig is custom designed for the valve and the corresponding ...
-1
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0answers
46 views
How to wire Christmas lights with LEDs to use for Arduino Project? [migrated]
First things first, I am new here and this is my first post. So if this is in the wrong place I apologize and please just let me know.
I am a programmer that is getting into working with an Arduino ...
1
vote
0answers
410 views
Can anybody advise what type of connector this is? [migrated]
I recently purchased an LiPower shield from SparkFun.
I also bought a Lithium Polymer battery off eBay and it appears to have a JST male connector (i could be wrong)?
I expected it to slot right ...
-3
votes
0answers
33 views
Upload sketch to Atmel328 with FTDI [migrated]
i have problem with FTDI programmer or Parts or Scheme or i dont know. Here is my scheme how it look and PCB.
What im getting from Arduino IDE is ... stk500_getsync() and i cannot upload sketch with ...
0
votes
1answer
46 views
Custom Heating Element with power controlled by Arduino
I'm looking for guidance on building an arduino-controlled heating element. I like to have a rotary encoder switch control the over heat delivered to the device.
Because heating is such a power drain,...
0
votes
1answer
82 views
Variable Frequency Drive Circuit
I want to make a low-cost solution regarding the control of a three-phase AC asynchronous motor. I want to be able to control it using an Arduino board(set the frequency from it).
Motor specification:...
0
votes
2answers
101 views
Multimeter shows different voltages for positive and negative voltage(interchanging multimeter probes) for same source
I have designed a 5v and a 3.3v regulator getting same source of 12v battery.
When I measure, the 5v regulator output shows -4.67v for + on black probe and ...
-4
votes
0answers
12 views
LIS3DSH accelerometer unusual behaviour [closed]
Im using LIS3DSH in my project,suddenly the X,Y,Z values are saturated to maximum G value,like if i select 16 G ,sensor is showing 16 G in all 3 Axis.can you help me out.
0
votes
1answer
60 views
Arduino micro usb
I have an Arduino Micro that is going to be mounted inside an enclosure in which it would be a pain to open the enclosure to adjust programming. Is there a way that I can access the DATA+ and DATA- ...
1
vote
0answers
78 views
Capacitors in DC circuits [migrated]
I have a question about capacitors in DC (digital) circuits. The picture below is an edited schematic of the Arduino Uno R3.
The DTR line is connected to the reset input of the Atmega328 by a 0.1uF ...
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votes
1answer
62 views
Arduino power mysteriously stays on
I'm experimenting with an Arduino Mega, using it to test some relay logic. The Arduino is powered from my benchtop power supply via the Vin and GND pins.
I have digital output pins connected to some ...
1
vote
0answers
61 views
How fast can I read Arduino port D? [migrated]
I'm trying to see how fast I can read an Arduino IO port. It's being toggled with an random speed /white square wave and I want to see which is faster, the Arduino or the signal. The pin on port D ...
3
votes
0answers
153 views
Arduino Unreliable Serial communication [migrated]
After reading the following 2 articles:
https://hackingmajenkoblog.wordpress.com/2016/02/01/reading-serial-on-the-arduino/
https://hackingmajenkoblog.wordpress.com/2016/02/04/the-evils-of-arduino-...
3
votes
1answer
83 views
Separate voltage and current from regulated DC power supply
I am currently doing a MPPT(Maximum Power Point Tracking) using Arduino UNO.
So far I have pretty much almost finished the coding. When I was about to test my program using a regulated DC power supply,...
