Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
0
votes
0answers
18 views
Arduino AC Bulb Dimmer Krida not detecting the Zero-crossing until a touch it
I'm having an strange issue with an Arduino Nano and a Krida AC Dimmer:
http://www.inmojo.com/store/krida-electronics/item/8-channel-ac-light-dimmer-module-arduino/
I use the Arduino to detect the ...
-7
votes
0answers
37 views
1
vote
1answer
31 views
Vee negative voltage output LCD
I have a LCD i want to use for a project but still can't get it working on a breadboard.
I have used LCD's before so I'm familiar with them, this one however has something i haven't seen before.
...
-2
votes
1answer
21 views
matlab+arduino+lcd
I am trying to send some integer to lcd.But it is not working.I have tried it in Proteus.Please help....I have uploaded matlab and arduino codes below....
matlab code
...
0
votes
0answers
12 views
RF transmitter/receiver strength
I am new to this site. I've ended up here many times in the past, but only joined today. This is most likely a novice-level question, but here goes...
I have a simple 4-button remote and a 315MHz ...
-3
votes
2answers
37 views
Measuring ADC sample rate - Arduino DUE
I want to measure the conversion rate of an arduino DUE. I know I could just take it from the datasheet but I need to measure it because I am running the ADC in free running mode.
Hints are welcome, ...
-10
votes
1answer
63 views
Solar tracking for a moving boat [on hold]
I need a way to track the location of the sun from a non stationary position.
Boats change direction and bob up and down.
I am trying to come up with an 'offline' solution and running out of ideas.
It ...
-1
votes
0answers
59 views
Convert 5v Square wave to 12v Square wave
In my recent project, I want square wave which length can be vary through program. I got it but it's 5v square wave because it's generated by Arduino. But in my requirement, I need 12v Square wave. So,...
0
votes
1answer
21 views
“CH340” usb-serial interface chip drivers cause AVR reset problems under Windows / Linux
Attaching a "Nano V3.0" arduino clone device to a Windows 7 PC's USB port causes the ATMega328P on the device to misbehave and lock up.
We are deliberately NOT using the Arduino toolchain - we are ...
0
votes
0answers
21 views
SIM900A based GSM modem is turning off in a long run
I have a AC mains controller using GSM modem based on SIM900A. The relay is driven from 12V and has ULN2003 (Darlington pair array) as a driver. The ULN2003 is signalled from Arduino. The problem is ...
0
votes
2answers
129 views
How to level shift + / - 1V waveform signal to 0 - 5V
Currently I am trying to build a portable ECG device where by the ECG signal will then be sent to Arduino UNO where the data will be transmitted via Bluetooth and the waveform will be displayed on ...
0
votes
0answers
45 views
Arduino mini pro 3.3v project for newbie [on hold]
I am a newbie to arduino mini pro but i worked with a mega before.
The model is
Arduino mini pro 328 3.3v/8mHz
I am asking for an advice not to fry it and also asking if the board is capable of ...
1
vote
3answers
100 views
Arduino best way to control external potentiometer of device
I have a consumer equipment which has a knob and turning potentiometer to control the heating element.
I have not taken apart the device yet to see the exact value of the pot but looking for some ...
0
votes
0answers
7 views
Timer3 Arduino maximum periode [migrated]
at the moment I'm trying to learn microcontroller with Arduino, and have a problem with the timer.
Arduino works at 16MHz clock, and the best prescaler is 1024, which means the timer increments the ...
0
votes
1answer
31 views
Can I use a key switch rated as suitable for 12 or 24V DC with an Arduino?
I want to use a key switch in conjunction with an Arduino, so that I can detect when the key is turned by reading HIGH on a digital input pin. This is the one I have found that matches the aesthetic I ...
1
vote
1answer
30 views
Gesture controlled robotic arm
Can I use gryometers and accelerometers to map the movement of a human arm and then apply it on a robot? The idea that I have is to collect the data from multiple sensors using Raspberry Pi and ...
0
votes
0answers
24 views
L293DNE motor driver heating up [duplicate]
Electronics noob here very minimum knowledge
Aim: I have an old Rc Car that I wanted to restore and add new electronics, so that I could control it will bluetooth.
Electronics used : Arduino uno, ...
-2
votes
0answers
27 views
Arduino Ethernet with usb2serial does not connect COM port to PC [migrated]
I have a problems with connecting my arduino to my PC. I'll try to explain what happened.
I was using arduino ethernet with usb2serial to play with servo motor (single) MG996R. My setup was : arduino ...
0
votes
1answer
39 views
How can I estimate reception signal strength for RFM12 or RFM69? [on hold]
I want to use RFM69 or RFM12 modules for transmitting data within the house, controlled by Arduino.
How can I estimate the reception quality to adapt the transmission power?
0
votes
1answer
33 views
Power a MOC3010 with an arduino
I have a project I am building for my Kids Church Room. I have a bunch of LEDs being lit by an arduino Uno, but at one point in the light pattern, I want to have a bell ring. I bought a doorbell that ...
-4
votes
1answer
66 views
How can I boost my radio transmission signal? [on hold]
I connected a wire about 20 cm long into pin 13 of my arduino and put on the blink sketch.
I put my phone into FM radio mode and found the signal on 95.9 MHz.
If I go more than 3 feet the signal ...
1
vote
1answer
47 views
Using a PNP transistor as a switch connected from a 74154 then out to stepper motors
I am currently working on a project that involves an arduino mega 2560, one 74154 demux and 16 stepper motors. I want to be able to control which stepper motor turns at a given time. For this, the ...
0
votes
0answers
21 views
InfraRed raw data reading [migrated]
I'm trying to understand few things about this code,
Why digitalRead() is slower than IRpin_PIN & (1 << IRpin)? ...
0
votes
1answer
28 views
MOSFET arduino RGB LED strip problem
I'm trying to control my RGB led strip using my arduino.
I'm using the following schematic:
http://www.engineerathome.com/upload/rgbledschema.png
For some reason the led strip turns on when I ...
0
votes
2answers
37 views
Reverse signal protection for two devices with different voltage levels
I want to design a circuit that is capable of blocking reverse voltage signals but allowing forward voltage signals to pass through.
The original problem and solution:
I was designing an Arduino to ...
0
votes
1answer
69 views
How to connect three independent PCB circuits [on hold]
I have a PCB Board that I built for a 2 player game show console. Push one button, an LED lights up and the other player is locked out until reset is pushed.
I have two Arduino Uno boards, each with ...
1
vote
1answer
32 views
How do I offset flashing of IR remote in Arduino? [closed]
I am working in Arduino on a mini pro. I have an old MP3 remote which transmits infrared at about 38Khz. I have a program written that when my infrared sensor is picking up on a signal from the remote ...
0
votes
0answers
28 views
How to make 10X10 Ldr matrix
I want to know that can i make 10X10 ldr(light depending resistor) matrix and use it with arduino.I see how to make a 10X10 button matrix.plz reply it is for my college project
UPDATE
Actually i want ...
0
votes
0answers
12 views
Is there any 3G module which is compatible with arduino and can be bought in India and used in India? [closed]
Is there any 3G module which is compatible with arduino and can be bought in India and used in India. Something like SIM800 module for 3G. I found SIM5300E but I am not sure if it will work and it is ...
-3
votes
0answers
21 views
Home Automation, controlled using Web Switch. Is there any related projects using this items? or diagram?
I have an Arduino Uno R3, 8-Channel 12 volt Relay, and W5100 Ethernet Shield for Home Automation, controlled using Web Switch. Is there any related projects using this items? or diagram?
-1
votes
2answers
80 views
What maximum number of buttons i can connect to Arduino (100 buttons and more)
Is it possible to connect something like 100 buttons to one arduino nano, by using this classic method (or other possible cases)?
0
votes
1answer
53 views
What are the reasons why this analog to digital conversion is inaccurate?
I am planning to wire up the following sensor to an Arduino or a Raspberry Pi with a ADC.
The following segment gives a wiring diagram and than says that "Analog to digital conversions rely ...
0
votes
0answers
68 views
Working of the transistor configuration in this circuit? [closed]
Can anyone explain the use of PNP and NPN transistors in this circuit?
0
votes
1answer
30 views
High current/voltage switch
I working on a coil gun for a demonstration on electromagnetism. I have 2 stages, each with 2 1400uF 450v capacitors that I will be charging up to 375v. I am looking for a switch, or something to the ...
-4
votes
0answers
53 views
MOSFET before turn off get +20V +22V on GATE
Have some problems with MOSFET. My circuit:
It used for voltage regulation from 0 to 24V. Mosfet i drive with PVM from Arduino, all ok. But before MOSFET get off, the Gate-Source voltage reach about ...
5
votes
2answers
282 views
Super capacitor directly on the power supply
simulate this circuit – Schematic created using CircuitLab
I have an atiny with an RF emitter which would detect the 220V AC off in the circuit and send a radio signal.
to do this I use 2 ...
-3
votes
0answers
50 views
Arduino Detect Servo Stall
I try to detect when my servo stalls with a voltage divider but as soon as I connect two resistors (both 220Ohm for test purposes) it doesn't move at all. I don't know why...it's really annoying.
I ...
0
votes
1answer
31 views
Has anyone worked with HX711 load cell amplifier / weighting sensor through Arduino? [closed]
I am talking about this product: http://www.ebay.in/itm/232127458591?aff_source=Sok-Goog
I need to know the following:
1) What outputs are represented by DT and SCK?
2) What inputs are B- and B+?
...
0
votes
0answers
41 views
Can i get patent from device which was made with open source parts [migrated]
Can i get patent from device which was made with open source parts? I have some concept of device but its made with arduino and other (arduino-friendly) components. Is it possible to pass all ...
0
votes
0answers
10 views
D.C. Geared Motor [migrated]
I have a dc geared motor and want to control with motor shield with arduino mega2560 board. But here confusion is that I don't know how to use the hall effect sensors of motor and connect them with ...
0
votes
2answers
57 views
Why do most Passive Buzzer Modules for sale online use PNP transistor?
At first I have made a simple circuit to make tones with a passive buzzer. I have used a buzzer, 1K resistor on base and a NPN transistor (8050). This is working nicely. The circuit is similar to what ...
0
votes
1answer
54 views
Having trouble understanding circuit diagram (paper touchpad)
A few years ago someone posted a demo on youtube for a "paper trackpad" which is basically an alternative for your laptop mouse (see here). This particular project uses Arduino as a microcontroller. ...
0
votes
0answers
20 views
Best way power an arduino using Vin pin [migrated]
I have a powerbank rated 5v.The battery is actually 3.6v which is powering the built-in smps to give out 5v.
What I am currently doing is that I have stripped one end of the USB cable coming from the ...
0
votes
1answer
32 views
Transistor with nfc doorlock on arduino
I'm pretty new to using transistors and I'm trying to make nfc doorlock. My electoric doorlock is working on 9V and 280-530mA, and have resistance about 20 Ohms. I'm powering it from external 9V power ...
0
votes
0answers
21 views
Arduino, L298N and 4x 5 V motors voltage loss
I'm building a circuit with an Arduino Uno rev3, a 12 V wall adapter connected to the Arduino power port, 4x 5 v 180 mA motors and an L298N motor controller. The L298N controller is powered from the ...
1
vote
4answers
84 views
Arduino I2C communication between 2 master networks
I have 2 Arduino microcontrollers, each with a network of I2C devices connected to them (one has 2 ADCs and the other an LCD display and a RTC). How can I use the I2C connection to transfer the values ...
0
votes
2answers
77 views
LED Visible Light encoding
I'm trying to drive a 12V LED with an arduino acting as an encoder: a PWM signal with 80% duty cycle ("1" symbol is +5v for the 80% of the time, 0v for 20% of the bit-time) . Testing the maximum ...
0
votes
1answer
31 views
Rs485-TTL-Arduino data receive [closed]
I want read data from rs485 port to arduino using Rs232-TTL converter but I am not getting any data in arduino serial monitor. Please help me.
1
vote
1answer
48 views
Arduino - Use arduino as to switch to power up 12v pump
I want to switch a 12 V pump from the digital output of an arduino. I have tried using 5 V relays by using this schematic:
and put two of these in parallel. The power they are getting is from the ...
0
votes
1answer
114 views
Simulating a simple RC circuit using an arduino and the circuit's equivalent discrete-time transfer function
Suppose we have an RC circuit with the continuous transfer function: \$G(s)=\frac{1}{RCs+1}\$ with R=1.6k, and C=2uF. Using the bilinear transformation(or better known as Tustin method) \$ s=\frac{2}{...
