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0
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0answers
11 views

Start a circuit or device when you insert key in car ignition

I want to start a circuit in my car when I insert my key in car ignition and let it turn off when the key gets removed. I have Honda Civic 2007. Can someone just help me out as to from where do I take ...
0
votes
1answer
33 views

What is that mean “This Sensor use 5v as a working Voltage only”?

I am trying to understand the mean of 3.3v or 5v IC but I don't know how to use the right keyword in search engine to fine the explain article so I'll explain... We know Arduino UNO R3 as example ...
0
votes
1answer
27 views

How to measure power factor cos phi with an Arduino?

according to How does one measure the power factor? I can measure the power factor (cos phi) by comparing the zero point crossing of Voltage and Current. This is clear. The problem I have is what if ...
-5
votes
0answers
25 views

controlling multiple RGB LED's

I'm currently in 1st year for electronics and I want to do a project. Basically I'm going to control about 150 LED's and make them each have different colors. Then I will put white glass over the ...
0
votes
0answers
7 views

Problem receiving CAN messages using arduino, MCP2515 CAN module and multiprotocol radio shield [migrated]

I am using an arduino UNO and a Cooking Hacks CAN BUS module through a Cooking Hacks Multiprotocol radio shield. I plan to read the CAN messages through the car's OBD-II port. I have connected the ...
8
votes
2answers
214 views

MCP3424, how to read channels in parallel?

About this question I do not have an electronics engineering background, and this is one of my first challenges with communicating via I2C, and with writing to a register, so please do not assume too ...
0
votes
2answers
75 views

Need some help to design power supply for custom Arduino PCB [on hold]

I am building a custom Atmel Mega 2560 PCB that will run off the 9V 600mAh rechargeable li-ion batteries in a bus. I need to supply - 5V for MCU and other components in PCB, the overall current ...
0
votes
1answer
40 views

Arduino piezo vibration measurement circuit

I'm looking for a very simple measurement circuit to measure vibrations with a piezo elment and an arduino device. I want to read positive and negative values. I have this sensor: ...
1
vote
1answer
35 views

Piezo vibration sensor board negativ values

I have this piezo vibration sensor module from Grove: http://www.seeedstudio.com/wiki/Grove_-_Piezo_Vibration_Sensor Using this sensor and an arduino device I want to measure two things: amplitude ...
2
votes
1answer
52 views

Freewheel diode / capacitor with this board?

With DC motors, it is common to put a freewheel diode and/or a capacitor in order to protect the equipment as the motor can induce current into the system. I plan to use this board to control a 24V ...
-2
votes
0answers
33 views

Velleman KA02 Problems [on hold]

I recently bought a Velleman KA02 Arduino Audio Shield (http://www.velleman.co.uk/contents/en-uk/p579_ka02.html), which uses an ISD1760PY audio chip and soldered it together. The first time I fired it ...
-5
votes
1answer
33 views

How do i connect my Nexys 4 Artix-7 Digilent FPGA board to my PN532 NFC/RFID Controller Shield for Arduino?

I am currently working on a FPGA project which i know nothing about. Truth to be told, I am learning how the FPGA and the Verilog language works from scratch and I am indeed experiencing lots of ...
1
vote
3answers
88 views

Photodiode and Arduino

I am trying to build a chrono to measure the speed of a projectile. I plan to use an arduino and photodiode. I would like the photodiode to change the state of the arduino's digital pin when an ...
-2
votes
0answers
36 views

VIsible Light COmmunication using Arduino for masters thesis [on hold]

I am currently doing my Masters in electrical engineering. As part of my Master's thesis I want to conduct some research/project in Visible Light Communication using arduino. I have a time frame of ...
1
vote
2answers
34 views

Multipurpose momentary button - microcontroller/arduino/esp8266

as more of a hobbyist than a pro I apologise if I'm asking the wrong questions, however I have been researching for a while and hoped Stack exchange might help. I've read a few articles on low power ...
0
votes
0answers
49 views

ATTiny84 blink mystery [migrated]

Novice mode, please. I programmed my ATTiny84 using Arduino Ethernet (Arduino IDE 1.6.7) using https://github.com/damellis/attiny branch - ...
-3
votes
0answers
26 views

1.5A micro motor driver transistor/IC for micro quadcopter-arduino [on hold]

im planning to make micro quadcopter using hubsan micro motors that i ordered from ebay (CL-0720-12) together with corresponding hubsan x4 proppellers. At max voltage (3.7V), motors load current is ...
-1
votes
0answers
20 views

iOS compatible Bluetooth module for high throughput [on hold]

Suppose I want to transfer data from an AVR-based device (say ATMega2560, preferrably an Arduino) to an iOS device (iPad or iPhone) at a decent speed (at least 200kbps), what bluetooth modules are ...
-3
votes
1answer
56 views

Voltage divider resistor power disipation [duplicate]

I am trying to create a power supply circuit for the ESP8266, using a voltage divider and a cellphone charger rated at 5V, 1A as power supply. I have resistors connected like this: The resistors ...
-1
votes
0answers
23 views

Controlling 3 stepper motors simultaneously [migrated]

I have three stepper motors connected to the drv8825 drivers to an arduino uno. I am using the example code below (from here), which works fine for moving multiple stepper motors at the same time BUT ...
0
votes
2answers
49 views

Measuring Boltzmann constant using thermal noise

For my physics lab I have to come up with a way to measure Boltzmann constant using thermal noise. The circuit that I 'm going to use is something like the one in the figure below: Than I'm going ...
0
votes
0answers
57 views

Quick start on Arduino for experienced embedded programmer? [migrated]

I'd like catch up the Arduino concepts (programming & IDE). There are excellent online tutorials available for Ardunio but all of them which I saw are made for those who didn't have ...
0
votes
0answers
24 views

ENC28J60 connected to Arduino on SPI

I have an Arduino Uno, that has been connected using SPI to an RC522 rfid board and an ENC28J60 ethernet board. SS1 for ethernet is port 8, and SS2 for RC522 is port 10. I can use the RC522 without ...
0
votes
1answer
38 views

Ramps 1.4 stepper motor Slaving

So I am looking to run 2 stepper motors for x and y axis with a ramps 1.4 board, but since their are only one stepper motor driver per axis i was wondering how to accomplish this? (I'm thinking a ...
0
votes
2answers
89 views

What are the different ways to switch power using a microcontroller (Arduino, Raspberry Pi, BeagleBone, etc.) and what are the pros/cons for each?

I'm using an Arduino to control a 12v water pump for a self-watering plant wall. I'd also like to use the same power supply for both, and probably need surge protection of some kind to avoid spikes. I ...
-8
votes
0answers
47 views

Arduino to arduino serial communication through serial1 port failed

I need to send array of data from one arduino mega to another arduino through serial1 port( pin 19, 20).. But I can't get correct data on receiver data.. Please someone help me.. Code. Sender. ...
-1
votes
1answer
41 views

Factory Reset a HM-10

I had programmed a HM-10 module to act as iBeacon with my Arduino Uno's serial monitor using the following steps: AT+RENEW Restores factory defaults AT+RESET Reboot HM-10 AT Wait for OK ...
-1
votes
0answers
50 views

Powering an always-on Arduino

I need help designing a circuit to power my Arduino. The Arduino has to always be on(or on as much as possible), and my plan is to use a solar panel and two 3.7v rechargeable batteries to power it. ...
0
votes
1answer
24 views

Replace inverter manual potentiometer with mcp41010

I have an 3 phase ac inverter that uses standard potentiometer for motor speed regulation. The speed reference voltage is 0-10v and i need to control it using arduino. In MCP41010 datasheet I ...
1
vote
1answer
47 views

MOSFET output I on Arduino

I am trying to power a pair of TEC (thermo-electric cooler) using Arduino. I came across this guide that is used to power one. Because I have two, I want to know if I can still use something such ...
-8
votes
0answers
42 views

Please Fix my issue [closed]

I would like to build a hexacopter. I have looked many resources to do this. I couldn't understand the starting point.I have been researching on net since many days. What is the basic knowledge ...
2
votes
3answers
95 views

solar power ESP8266 microprocessor circuit to turn off when low voltage

I intend to run an esp8266 microprocessor on only solar panels so it is on during the day and off/disabled during low light conditions that do not supply sufficient power. Is there a circuit that ...
0
votes
0answers
26 views

Arduino Mega ADC error when using PWM

I am building a temperature controller, where I read 16 ADC inputs (thermocouple amplifiers), and at the same time I am using 6 PWM outputs (at 10 Hz). When I am only reading the ADC values, I have ...
1
vote
3answers
105 views

Optoisolator, did I connected it right? (Arduino Uno)

Here is my connection for optoisolator, 2 wires, yellow and red are for AC current. Other 3 in my arduino, orange pin 2, blue ground and red 5V power. And ...
0
votes
1answer
48 views

Arduino and STM8 I2C Communication

I want to I2C communication stm8s(slave) and arduino uno(master), but it does not work. Arduino Uno(master) code: ...
0
votes
2answers
108 views

How to test if zero crossing is working?

I used circuit like this: On led I get: 3.3 mA and 1.3V What is the best way to test if zero crossing works with arduino or multimetar?
0
votes
1answer
42 views

AC supply to digital output

I need to sample 8 power switches connected to 230 Volt supply. I want to record the status of these switch every 10 seconds and send to cloud for which I am using arduino with ethernet shield. For ...
-2
votes
1answer
60 views

Arduino does not receives response over RS-485

I am using arduino uno to communicate with my industrial drive. I am using juan bester library for RS485 communication. Now here's what's happening: When I open serial monitor in my arduino after ...
-1
votes
1answer
19 views

5v regulators and arduino [closed]

If my arduino has a converter that I can plug a 9v battery into, with a regulator built into the board, do I need to wire a 5v regulator into a system with mult. servos or in something?
1
vote
1answer
62 views

Strange electrical noise from stepper motor

It's my first project using arduino. Simply trying to rotate three identical stepper motors, using three 293d h-bridges. Although it does work properly (meaning the motors do rotate as they should), ...
-1
votes
0answers
29 views

How to wire an LMD18200 and an arduino? [migrated]

Ive been working with a motor project for a while and i bought this H-bridge(LMD18200). I dont understand how im supposed to connect it to the arduino. Here is the datasheet for the lmd18200:
-2
votes
1answer
45 views

Interface RTC and Accelerometer to Arduino UNO board [closed]

We are trying to interface RTC DS1307 & ACCELEROMETER ADXL345 on arduino UNO board. Both these requires analog pin A4 and A5 of arduino but at a time we are able to connect only one of the deive, ...
1
vote
3answers
60 views

How to measure servo potentiometer

What's a reliable method of getting a clean measurement of the potentiometer in a hobby servo? I've modified a servo for directly polling its position by soldering a wire onto its potentiometer's ...
-3
votes
0answers
50 views

How to power an arduino pro mini (3.3V) using 8 AA (12V) batteries?

I know you need to use the RAW pins, however when using fresh AA batteries I've noticed I often get > 12V. Am I in danger of frying the board doing this?
3
votes
2answers
124 views

Mechanical Switch in parallel to the Micro Controller working in Sync

Here is the image for my requirement,want to operate Load Lamp of 230V AC with Mechanical Switch in parallel to Controller where one can 'ON' the Load Lamp from the Mechanical Switch and 'OFF' from ...
3
votes
1answer
52 views

Test circuit for EU1640BCH12T / R Water proof ultrasonic sensors with Arduino?

I have EU1640BCH12T/R waterproof ultrasonic sensors, which I have got from this link. These are standalone raw sensors without breakout board and not a module like HC-SR04. Being a new electronics ...
4
votes
2answers
106 views

Buck Converting Voltage, to Switch Original Voltage

I'm learning electronics, so I want to sanity check this approach in case I'm missing something. I have an arduino (at 5V) controlling power to a set of lights at 12V, via a mosfet. This is all fine, ...
-5
votes
2answers
57 views

M-Bus (Meter-Bus) Arduino / RPI [closed]

Is there some one that have manage to connect to a M-Bus (Meter-Bus)? With a Arduino or RPI? Maybe a M-Bus to serial is the way to go?
1
vote
1answer
85 views

Using optocoupler with MOSFET for dimming a LED

I have a blue LED which I want to dim using an Arduino, an optocoupler and an N-MOSFET. For achieving this I assembled the circuit on a breadboard as shown in the pictures, using a YwRobot breadboard ...
0
votes
3answers
86 views

Using Super Capacitors with solar cells and batteries to help save my dogs

I am looking to make a dog feeding mechanism that will operate regardless of power outages. The main point of this query initially is to figure out how to work with the materials I have (or can get) ...