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2answers
45 views

how long charge li- ion battery

I have \$3.7V\$ Li-ion battery \$3800mAh\$ and Solar panel \$U=5.5V, I_{max}=290mA\$. Battery will supply arduino with sensors taking \$100mA\$ current. How long will it take to charge the battery ...
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0answers
36 views

Analysing Motor frequency by a microphone and Arduino

I want to analyse the frequency of an electrical motor used for an industrial cooling system. It seems to me that the Arduino UNO is fast enough to be able to analyse and calculate the main frequency ...
0
votes
1answer
34 views

Connect the Sparkfun CAN bus shield with an RFduino

I have a problem which I am working on for some days now. I do have knowledge in electronics, but not extensively. I also posted this question in the RFduino Forum but couldn't get any good answers. ...
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0answers
21 views

how to add .h file in Arduino library [on hold]

I am trying to make ultrasonic distance meter using Arduino. For this i add ultrasonic library. but on compiling it show error "ultrasonic.h not available" please tell me how to add this .h file
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0answers
7 views

programming attiny88 & attiny828 with arduino [migrated]

I found some information that the attiny88 and attiny828 can be programed from an arduino, similar to the programing of the attiny85/45, simply connecting the right pins. How to program Atmel ATtiny88 ...
0
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0answers
4 views

RC servo misbehave using arduino and MPU6050 [migrated]

I am a beginner.. I am trying to control RC servo using Arduino based of data from MPU6050. I am using library I2Cdev to communicate with gyro and to get yaw, pitch and roll. I am using example script ...
0
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0answers
27 views

Which TFT display to use for faster processing speed?

I'm planning to integrate a user interface into my arduino project and came upon TFT displays. While interfacing with the TFT displays, will it affect the performance of the arduino processing? Also ...
0
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0answers
4 views

Breadboard Arduino not loading sketches [migrated]

I have put together a breadboard version of the arduino by following the tutorial on arduino's main website https://www.arduino.cc/en/Main/Standalone. I have done everything exactly how that tutorial ...
1
vote
1answer
42 views

Connecting BeagleBone Black to an Arduino

I am a software guy (everyone immediately downvotes...) trying do the following: (1) On a BeagleBone Black ("BBB") I am driving a GPIO pin high in software. (2) Then I am sending PCM (audio) out ...
1
vote
1answer
38 views

AtTiny84 with USB

I am having some problems with the ATTiny84 and USB. I am creating an "arduino clone" but I want a simple (and especially compact on the board) way to implement a USB serial interface. This will only ...
1
vote
2answers
260 views

Measuring current drops voltage?

We have some pcb in which contains an MCU ,and some WiFi module . Usually at start, the board takes 70-100mA with 3v3 . It gets its current from the UNO board connected to a mac. It works great like ...
0
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0answers
31 views

Receiving sensor data with Arduino: push or pull?

Every second I am reading a data string (comma-separated) from a battery management system via RS232. The first step was stripping the field name from the value; at times resulting in skipping a ...
2
votes
3answers
118 views

Arduino Uno reading analog 24v DC signal

Disclaimer: Please be gentle - I'm a newbie with electronics. Overview I have a proprietary 24v DC analog sensor signal that I'm trying to interface with using a Arduino based microcontroller. The ...
0
votes
0answers
17 views

How to get the string from php page to sim900? [on hold]

I am doing this project in which when I type some string on php page and click on button,the arduino should display that string on the lcd. I am using sim900 GPRS to connect arduino to the internet. ...
0
votes
1answer
52 views

Can someone verify my EL wire oscillator?

I'm pretty new to electronics, but my latest project is a circuit with two "frames" of animation that I make out of EL wire, and I want to build a circuit to switch between them every 2-3 seconds or ...
2
votes
0answers
54 views

Is it possible to control the speed of DC motors with Arduino's analogWrite() using analog pins? [migrated]

I'm trying to control the speed of two DC motors that are connected to a dual H bridge. I always used digital PWM pins with analogWrite() to change the speed, but ...
1
vote
2answers
44 views

Effect of 2-terminal and 3-terminal Voltmeters and Arduino Voltage Sensing on Circuit

I am trying to build a board to sense circuit voltage relative to ground at different points on a breadboard. I would want the board to work regardless of configuration of the circuit. The only ...
1
vote
2answers
123 views

Why is ground voltage non-zero, and why does it increase when I plug in an LED?

Here is the circuit (Arduino Due, 1kΩ resistor, LED): Note how I bring the ground from the Arduino board to the breadboard, and also connect the ADC pin to the gnd rail on the breadboard. Here is ...
0
votes
3answers
73 views

Basic power: drive 12v LED from 5v Raspberry Pi output — no 12v supply available

There are a lot of questions on here and elsewhere about this. The consensus seems to be to use a transistor to switch a power supply — implying that I have a 12v supply available. Only 5V is ...
0
votes
2answers
83 views

Strategy for a learning lawnmower robot, and choices of motors

I am pondering on building a practical learning lawnmower robot (could be Arduino based) and I am wondering if this will work. The robot will be both autonomous and RC (radio controlled). Given some ...
0
votes
0answers
26 views

advantages of a arduino uno waveform generator over an arbitrary waveform generator [on hold]

Could someone tell me a few differences or advantages of a arduino uno waveform generator over an arbitrary waveform generator?
2
votes
1answer
61 views

How to make arduino GPIO to operate at 3.3v instead of default 5v

I am working on a project, I use arduino mega 2560 with system operating voltage of 5v, at the same time I have a Bluetooth module which operates at 3.3v is there any way to reduce my arduino output ...
0
votes
0answers
25 views

Automate 3DS Analog Stick Input with Arduino

I have a Arduino that can output 5v and 3v. I have a Nintendo 3DS that runs on 1.8v. I need the Arduino to send between 0 and 1.8v to the Nintendo 3DS Analog Stick to control it. Do I hook up two ...
0
votes
2answers
83 views

When should I use opto-isolators and isloated DC-DC converters?

I am using multiple DC-DC converters to obtain 12V and 5V. Shall I use non-isolated or isolated converter for Arduino's? From what I have read so far, isolated are used when you have inductive ...
2
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0answers
43 views

node voltage conflict

background: My goal is to use an Arduino with two proximity probe (sensors) to achieve some output. It is worth mentioning that the output of the proximity probe has two components: DC output that ...
0
votes
1answer
59 views

Using Arduino + MOSFET to automate the pressing of button

I am working on using Arduino Uno to automate the pressing of buttons. The configuration to the left is the current configuration and it works fine. However, the configuration to the right doesn't. ...
1
vote
1answer
51 views

Why does a resistor in my Neopixel data line work at all?

Adafruit's best practices for their Neopixel LED strings say, "Place a 300 to 500 Ohm resistor between the Arduino data output pin and the input to the first NeoPixel." Someone asked about the ...
0
votes
1answer
63 views

Driving IR LEDs using PWM - measuring current & current source questions

For a project I'm currently working on, we're trying to drive 940nm IR LEDs (Kingbright L-934-F3C) using PWM, regulated by an Arduino Uno. We've run into several issues during our prototyping process ...
0
votes
1answer
34 views

Variable Air Flow Dampener [closed]

I am trying to create a servo actuated air flow dampener to maintain a desired air flow in a pipe. I am using a thermistor set up to measure the air speed. I have ran into the problem where I can only ...
0
votes
1answer
44 views

IOUSBFamily is having trouble enumerating my device MAC OS X 10.9.5

Hi I have an arduino clone it is called gizduino mini usb it has a ATmega 328 processor, I followed the instructions posted on this website: ...
-2
votes
0answers
28 views

is any windows application available for accelerometer based computer mouse [migrated]

I want to make an AIR mouse using Arduino and accelerometer, for this i used USB to TTL converter i have done everything successfully but can anyone tell me how use it in computer. I mean i don't know ...
0
votes
1answer
41 views

Problem Measuring Current in a High Voltage circuit with arduino

I 'm measuring a current in a resistor as shown in the picture below. There I'm using a voltage substractor with an LM324 Operational Amplifier. I'm having trouble in the real World when the voltage ...
0
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0answers
19 views

I2C Display Module (NHD-C160100-DiZ) for DIY Scientific Calculator Help

Good evening everybody reading, This is a project I've been developing for about 6 months. I am stuck because I can't get the display module (datasheet here) to work. I attached my schematic for the ...
0
votes
1answer
39 views

WS 2811 lights flickering

I'm working on a project involving a bunch of daisy-chained WS2811 lights and I'm noticing significant flickering on the ones at the end (lights #16-30 in a chain of 30). Right now, the circuit is a ...
0
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0answers
26 views

Using Optoisolator to Control a Toy

I'm trying to control Tweet Monkey (http://codefoster.com/tweetmonkey) using a optoisolator. It's a 816S, but it looks like the specs are identical to the more popular PC817. I have an Intel Edison on ...
0
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0answers
104 views

What is causing my arduino controlled fan to run so poorly?

simulate this circuit – Schematic created using CircuitLab Some background first... I am a mechanical engineer who took 1 electrical engineering class back when I was in college, but ...
6
votes
1answer
100 views

Why do I have crosstalk in Arduino ADC, despite low source impedance?

I. THE CIRCUIT: Below, an Arduino Due measures voltage signals from two parallel voltage-divider circuits: We want the Due to accurately measure the voltages at the places where it makes contact ...
1
vote
2answers
70 views

FTDI UART programming (first steps)

Im currently trying to leave the arduino board aside and starting program microcontrollers on pcb boards via programming pins, im using an ATMEGA328u from this premade board, For starters im trying to ...
0
votes
2answers
45 views

Control of a coreless DC motor using a PWM and a mosfet

I'm using 4 Si2302 logic level mosfets to drive 4 coreless dc motors. The speed of the motors is control led by the PWM signal from an Arduino Pro Mini. The power supply for the boards is a 3.7V (4.2V ...
0
votes
0answers
12 views

Sketch Upload to LinkIt ONE Timeout [migrated]

I've just bought a new LinkIt ONE IoT prototyping board, and I'm having trouble getting started with it. I'm working on a mac. I've installed the LinkIt ONE SDK onto my Arduino IDE as specified in ...
0
votes
0answers
31 views

Rotating plate motor with position feedback

I am currently building a 3D scanner and I want the camera/laser to be fixed and the subject to move on a rotating plate. This is where I am now : the rotating plate design. Unlike most general ...
0
votes
1answer
57 views

Arduino cloning a IR signal

I have an issue here concerning Infrared and arduino, i have been disassembling various receivers and took out the IR sensor from them, but i have hard time to read any data from them. this is my ...
1
vote
2answers
94 views

Peltier circuit design for TEC

I'm designing a TEC circuit with a Peltier element, LM35 as the sensor and Arduino uno as the controller. I simulated it with Proteus and to my knowledge it was working, I suppose. But when I tried to ...
0
votes
3answers
60 views

Power supply PCB

I made a PCB board (my first one) recently and I ran into some issues with it while troubleshooting. The PCB board is connected to an Arduino and draws 5V and the 3.3V supply from it. Also, the board ...
-1
votes
1answer
31 views

FTDI disappears when powering circuit with it.

I'm trying to us the ESP8266 wifi board and when I power it over the 3.3v out on the FTDI the entire usb disappears from ubuntu. as soon as I take the power away it shows back up again. What could ...
0
votes
1answer
53 views

Monitoring voltage state without interfering

I have a CO2 laser cutter, and I am designing as circuit to turn on some outlets whenever the laser is firing. The laser is turned on by a 5V logic connection to the high voltage power supply. If I ...
0
votes
1answer
51 views

Audio hack: replacing electret mic with phone audio output

I'd like to feed a module with audio output from a phone's jack instead of the mic the board cames with. As I said the board is designed to operate with an electret mic with the following specs: ...
1
vote
0answers
37 views

Flash a .hex to an ATtiny45 with Arduino [migrated]

I'm trying to upload a hex file to an ATtiny45 with an Arduino. I uploaded the Arduino ISP sketch to my board. I connected the ATtiny as shown below: Then I go to CMD and type: ...
0
votes
0answers
23 views

Arduino ADK, other board, shield or what? [migrated]

Sorry for bothering. I have a problem with my project and I can't fine someone who can help me yet. I need the next configuration: PC --------------USB cable-----------------MegaA---------------USB ...
0
votes
0answers
118 views

How to simulate Arduino? [migrated]

QUCS is the only open source software which offers simulation (and designing PCB layout [in future]) of electrical circuits. But the problem with QUCS is that it is under development and many ...