Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
-1
votes
0answers
8 views
Expanding on Arduinos definition of a capacitor
This oversimplified explanation is somewhat confusing and I haven't been able to fully understand what they are trying to say. How would you expand? They already seem to be talking about AC and ...
0
votes
1answer
21 views
How to power up arduino and two 6v motors with 12v LiPo efficiently?
I have a 12v LiPo battery, arduino mega and two 6v dc motors (which will be powered by a motor shield). Although arduino can be powered using 12v, i don't want to do it because a lot of power will be ...
0
votes
0answers
6 views
Arduino UNO and Arduino Pro Mini and NRF24L01+ setup not working [migrated]
I have already tried possibly all the libraries (RF24, RF24(maniacbug), RadioHead, Mirf) available to with the NRF24L01+, to no avail. I might end up returning the modules I bought or getting them ...
0
votes
0answers
12 views
Interfacing Energy Meter with Arduino using MODBUS RTU protocol
How do I interface Rish EM 1340 energy meter with Arduino Uno? The meter has MODBUS RTU protocol and RS485 communication port. I am using RS485 to TTL converter for connecting meter to arduino. I have ...
0
votes
0answers
33 views
LED's: How to mimic color temperature of Sunlight using LED's [on hold]
I want to build a LED light which produces the colour of sunlight. I wish to mimic the colour temperature of sunlight during sunrise & sunset & even during bright daylight conditions. I am ...
0
votes
0answers
15 views
HC-05 with arduino
I have been trying to use HC-05 bluetooth module with arduino uno. The HC-05 module which I have has a breakout board with the EN pin instead of a KEY pin and a button besides the EN pin. I ...
0
votes
3answers
35 views
How to use photoresistor for counting passing objects
Can photoresistor be used for counting passing objects?## Heading ##
Hello i'm new to the electrical things
I wanted to ask if i can use the photoresistor sensor for counting passing objects if ...
1
vote
2answers
37 views
Can I connect multiple SN74HC595 shift registers separately (without daisy chaining them) to the same Arduino?
I'm sort of a newbie to this whole idea of shift registers and the Arduino shift register handling library. I've found many demonstrations online, where shift registers are daisy chained. But I need ...
0
votes
0answers
36 views
Updating code and configuration of a microcontroller after production [on hold]
I'm currently working on a project in school where we are building a small robot with different sensors, we are required to have the robot configurable via USB and also have the software on the robot ...
0
votes
1answer
35 views
Voltage Divider - Arduino Pro Mini 3.3V - Smartphone Battery (4.2V max) - which resistance values?
I want to measure the battery voltage on my arduino pro mini (3.3V version), which runs from a Li-ion smartphone battery (max 4.2V).
I used the typical voltage divider setup with R1 = 5.6M and R2 = ...
0
votes
1answer
41 views
Arduino/IC Picture Scanner [duplicate]
For a project I am working on, I need some kind of way for a micro-controller (preferably Arduino, since I have background knowledge) to identify a certain symbol on a piece of paper (e.g. recognising ...
0
votes
0answers
33 views
What is the necessity of “Prototyping Shield” for an arduino UNO R3? [migrated]
I just want to learn arduino and make some small projects.But in beginner starter kit there's a part named Prototyping Shield .Is it necessary or will it help me?
0
votes
0answers
10 views
Error with libraries after setting up Code::blocks to work as an arduino IDE [migrated]
I followed this guide: http://arduinodev.com/guide-to-arduino-development-environment-codeblocks/
Everything seemed to work until I compiled the example code:
...
0
votes
2answers
53 views
Control DC Motor with arduino
Recently I bought this motor and I want to control it with an Arduino. I read that I can drive the motor with a H-Bridge with TIP120 Darlington transistors, but the problem is that voltage in the ...
-3
votes
2answers
68 views
How to make ammeter with arduino?
i'm interested to make ammeter from arduino. So, i have 70A/50mV shunt resistor and wiring it into arduino.
From my schematic, Is this possible to meassure the current from 12V battery?If it possible ...
2
votes
2answers
88 views
What is the conventional circuit to control a P-MOSFET with MCU?
How a P-MOSFET works is clear, there is plenty of documentation on the web. But what's the standard circuit to use them as an ideal switch with an MCU is not that clear, in my opinion.
I saw there ...
0
votes
1answer
51 views
Low output voltage from arduino pins problem
I using RFID module and the project working well but the only problem is low output voltage from arduino pins when i put the card near module. it is about only 2v not 5v.
i test other pins but the ...
0
votes
1answer
37 views
Precision timing using arduino and external clock
I'm working on a very time limited project (8 weeks). Basically I need to perform measurements and save to memory.
2 identical boxes, 4 hours and no wireless or wired connection.
Each box is ...
0
votes
2answers
46 views
RC controller design for small car
I am creating a small car that is to be controlled by a small hand held joystick remote.
basically I am trying to find the best option for doing this task.
The vehicle has two 24V motors, one for ...
-2
votes
0answers
30 views
Electronic Stethoscope circuit with lm741 [on hold]
Pls I need a circuit, to relate with my Arduino uno to create an electronic stethoscope. A condenser mic would be the sensor. The signal would then pass through a preamp circuit then into the ...
0
votes
1answer
51 views
how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion? [on hold]
I need to work on how to add switches to the end of the rotation that will cut off a stepper motor so I don’t damage anything at the extremes of the motion. I'm using a Dual - H Bridge to control the ...
1
vote
0answers
101 views
I2C protocol between PIC32mx and Arduino Uno
I am implementing a way to transfer data using I2C protocol between PIC32mx and Arduino Uno. I've decided to establish PIC as master and Arduino as slave. I passed by all the definitions and configs ...
0
votes
2answers
52 views
Using two pressure sensors with same address over I2C
I'm a novice programmer and I have recently purchased the SparkFun Pressure Sensor Breakout - MS5803-14BA and used it to take pressure readings quiet easily with the sample code provided and an ...
-4
votes
0answers
21 views
How to connect mobile with arduino? [on hold]
I want to connect mobile with arduino for receiving and sending SMS. Give some tips for do it.
2
votes
1answer
49 views
AD9833 Problems with Arduino and SPI [Can't think of a good title]
Alright I'm about at my wits end, I'm playing around with a AD9833 to synthasize a sin wave. I have combed though all forms of forums regarding the AD9833 to no avail. This is the circuit I'm running. ...
0
votes
0answers
41 views
Raspberry pi motor problems
I am experimenting with autonomous vehicles using a raspberry pi and an RC car. I set up my raspberry pi to control the RC car's DC motors following this guide. All worked as expected.
For ...
1
vote
2answers
41 views
Understanding this circuit for getting sensor data from an arduino to a phone via the headphone jack
I am trying to understand the circuit below which relates to getting sensor data from an arduino to a phone via the headphone jack.
The instructions on this page aren't clear on what the function of ...
0
votes
0answers
43 views
Arduino Due serial garbage [on hold]
I have made a custom board based on the Arduino Due but have some problems with the Serial communication with the 16u2 chip.
i have usb connection with the 16u2 chip and was able to load the ...
0
votes
1answer
78 views
N-MOSFET switching an H-bridge: problems with PWM
In this circuit an Arduino digital pin drives the Gate of a N-MOSFET. When the pin is HIGH, current can flow from the H-Bridge GND to board GND. When it's LOW, current can't flow. What I need is to ...
0
votes
0answers
18 views
Elapsed timer circuit
I have a banner sm502a led scanner that i would like to use to measure the time it takes for the beam to leave a reflective surface till it acquires a second surface. Would like the time displayed on ...
0
votes
0answers
39 views
arduino serial comunication 1Mbps [on hold]
In my project I need to send data(digital data(0 or 1) from computer(matlab) to a circuit, the speed of sending data should be at least 1Mbps. I think,At first, I should send data from computer to a ...
0
votes
0answers
30 views
IR remote unstable button numbers [migrated]
Question
Is there a reason for unstable button numbers of an IR remote?
Desciption
I wrote a remote class where I identify the pressed number of the remote to set states. But however I get never ...
-4
votes
2answers
55 views
how to get current date in arduino without interfacing with pc? [on hold]
I want to place my kit independently without interfacing without PC,but it needs to know the current date.please do help with your answers.
-5
votes
1answer
25 views
Relay Arduino Connectivity [on hold]
I am using a relay to connect one of the bulb (240V) and another end to Arduino. I have wired up the bulb to a socket.
Socket Wiring:Red is connected to Line, Black to Neutral.
For the below Relay ...
3
votes
2answers
438 views
How to increase load voltage?
In my circuit diagram I measured +/- 0.7V across the motor. This barely moves the motor as it needs about 5-6V. The resistors in the circuit diagram are 1K.
I've tested the circuit with a low ...
1
vote
1answer
23 views
Opto isolator + triac vs. solid state relay for high AMP arduino project
I building an arduino device to turn on/off a high current (~10A/120V) oven. I was planning on using a solid state relay like this.
I keep seeing advice that talks about using an opto-isolator AND ...
0
votes
1answer
44 views
Arduino based clock with 4 pieces 4" 7 Segment LED Displays
I was going through multiple tutorials on how to create an Arduino clock with 7 segment displays. I planned to build one and purchased 4 large (4 inches) 7 segment 1 digit displays. The displays run ...
0
votes
0answers
25 views
How to make a hardware device to communicate with Andriod phone [closed]
I would like to make a small device to communicate with Andriod phone or Iphone.
Here is basic requirements.
1. The device has one small push button.
2 . When button is pushed, the device can send a ...
0
votes
0answers
30 views
How to make a hardware device to communicate to my smart phone? [closed]
I am a software engineer and some electric engineering backgroud.
I would like to make a hardware device to communicate to my smart phone.
For example send a signal or can just talk, or track where ...
0
votes
1answer
43 views
Arduino pushbutton max cable length
i have a question regarding cable length for a pushbutton in a home automation project.
I would like to have some light switches (regular switches from home shops) connected to my arduino - so 5v - ...
0
votes
0answers
22 views
Load cell to arduino board [duplicate]
Good evening everyone,
i would like to ask help with my project. I want to measure the thrust of a propeller connected to a motor using canister type load cell with 10 Vdc excitation voltage and ...
0
votes
0answers
62 views
ESP8266 sends garbage data always on reset
I am assigned to do a project on IOT using the ESP8266 wi-fi module. For refashing the firmware I also bought a USB-TTL converter and installed the necessary drivers on my PC
I connected the RX and ...
0
votes
4answers
68 views
What type of relay should I be using?
So I'm currently looking to control a lightbulb for some inefficient lighting to produce heat for a mini-greenhouse I am building. I'm looking at plugging in a wall wart 12V DC adapter and wire that ...
1
vote
1answer
42 views
Why is GPS module acting strange?
I am working on a Arduino based quadcopter. The Arduino being used is a Blend Micro. Not shown in the following diagram are 4 infrared sensors, 1 ultrasonic sensor and a 9 axis accelerometer.
The ...
0
votes
0answers
28 views
Arduino micro lost connection after first programming [migrated]
I have just programmed a new micro, loaded the basic blink code in it. After that neither my laptop, nor my desktop sees it anyway with the following usb error:
...
1
vote
0answers
40 views
Using map for DC motor instead of servo [migrated]
I am trying to use map command which is used to power servo 180 degrees as the potentiometer moves...
Forward
digitalWrite(I1, HIGH);
digitalWrite(I2, LOW);
...
0
votes
2answers
71 views
Solar powered Arduino project
I have some ideas for Arduino Nano projects I'm throwing around that I would like to power only with a solar panel and I'm wondering if I am going about it the right way. I have: A 7.2V 100mA solar ...
1
vote
4answers
76 views
Arduino powering an external circuit with higher voltage
First of all, I'm sorry for the newbie question. I'm a software engineer and only a hobbyist in electronics.
I'm trying to power up an external circuit using an Arduino digital pin.
The external ...
0
votes
1answer
69 views
How to wire multiple ir photodiodes on one arduino pin?
I'd like to use 50 ir photodiodes.
But, I'm not sure about it because I want it to be read only on one analog pin of an arduino.
My idea is to wire parallel like in this picture.
But, I'm just ...
0
votes
0answers
14 views
Arduino clone ch340g (at328p), MIDI over USB [migrated]
Hi I just bought my first arduino compatible device, and am greatly enjoying it. I finally could not resist the urge after going to an arduino meetup, where someone ...
