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How to program a CLK signal and its inverse with Arduino/AVR [migrated]

Is it possible to simultaneously output a clock signal and it's inverse using the timer register(s)? I'm using the following code in arduino to output a 1mHz signal on OC1A: ...
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1answer
25 views

Feeding arduino with ATX standby power

I'm designing an Arduino shield to allow the Arduino to control, among other things, an ATX power supply -- I'm running GPIO pins to the PS_ON and P_OK pins of the ATX. I would like to be able to run ...
-3
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0answers
25 views

Send arbitrary Wi-Fi raw packets with ESP8266 and Teensy 3.1

I have a Teensy 3.1 and a ESP8266, and I want to craft special raw packets (such as ARP packets). I searched the web and I found a discussion on www.esp8266.com ...
1
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1answer
47 views

Raspberry Pi GPIO pin layout + Cooking Hacks Shield

I am studying the schematic diagram of the Raspberry Pi to Arduino shield from cooking hacks and I noticed that there is an inconsistency in the labeling of the pins. So, this gives me two questions. ...
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0answers
15 views

Arduino WiFi goes SOAP XML [on hold]

In my project I need to communicate with smart camera via its wi-fi network through a series of HTTP POST with SOAP XML envelopes within. So, what shield/module I should buy ti do it? Could it be ...
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1answer
16 views

Xbee serial communication

I'm building a mesh network with xbees, arduinos and sensors. Right now I have 2 Xbee routers and 1 coordinator. Each xbee module has an arduino attached. To communicate from the router to the ...
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1answer
50 views

Proper Method of Powering Nokia 5110

I am considering getting some Nokia 5110's for use with my Arduino Nano board but I am in a pickle because I can't tell the correct way to wire it. Some people say to power it with 3.3V and only ...
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0answers
34 views

How to use L293D to spin HDD motor FAST?

Short version: I have a HDD motor I want to spin. I have the L293D chip and after hours of fiddling with code and timing, can only achieve 1200 RPM. How can I get more out of it? Long version: I have ...
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35 views

ULN2803 acting really strange when changing Vsupp from 9V to 5V

So I'm trying to replicate a camera flash for a model camera, I'm using an atTiny, pushbutton, some bright white leds and a pushbutton. My sketch is very similar to the ButtonStateChange Example in ...
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2answers
252 views

Logging lithium battery discharge: why this curve?

I'm using Arduino to log the discharge curve of a 5V battery pack (usb type for smartphone recharging). Using Arduino I read the voltage every second and I save it to a log file. Arduino is powered ...
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63 views
+100

Controlling electric power steering using an Arduino to emulate torque sensor

I am trying to control an electric power steering rack with an Arduino. To do this I need to "trick" the EPS module that there is torque being applied when there really isn't. On the rack there are ...
0
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1answer
86 views

Can I connect a MOSFET to an Arduino directly?

I have the following electromagnet and plan on connecting it to the following MOSFET which will be controlled by an Arduino (I'm thinking analogue or PWM). Do I need any other parts (resistors etc.) ...
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0answers
28 views

Cannot read PORTB from ISR [duplicate]

I am trying to interface an ultrasonic sensor to Atmega328P (arduino uno). I have connected ECHO pin of the sensor to PORTB and used pin change interrupt on this pin. Inside the ISR I try to read ...
0
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1answer
47 views

Making a magnetic levitation system with arduino

I am planning on making a magnetic levitation system with an arduino that checks the value of a hall's effect sensor twice per second (but I have tried even 1000 times a second though) and turns the ...
0
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3answers
60 views

sd mp3 player board *Christmas Present Project* [on hold]

I recently bought a turtle night light that projects starts and plays a little lullaby. the music is triggered by a switch but i would like to have it so on click of the switch it plays music i have ...
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0answers
52 views

Video Conferencing [closed]

I'm currently struggling about my final year project. I want to accomplished this video conferencing project. Actually, I'm building a device with camera and projector. I wanted it like a video ...
1
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2answers
58 views

3.3v from 5v Arduino digital pin

I have an ESP8266 that I've got connected to my arduino and communicating quite well with... Now I'm looking at options to run my conifig via battery, so need to find ways to shutdown the ESP8266. ...
2
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1answer
55 views

choosing the right Opto isolator?

In the process of developing an RDM Compatible DMX receiver board (using a ATMEGA328) and I have been fortunate enough to come across kimliv's most informative answer concerning such a board; DMX on ...
0
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1answer
53 views

speed control loop for line following Robot

I am working to control the speed in my line following Robot (using arduino uno),by using proportional constant Kp in a closed loop, in my code I calculate the RPM from The Right Motor and the Left ...
0
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0answers
57 views

Replacing an IR sensor with buttons

So i have this HI-fi sub-woofer control thing that only has remote control support and i have no remote and I've got no codes for universal remotes. tbh just some switches on the side would be all i ...
0
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2answers
66 views

Help building a scheme (involves L293D H-bridge)

I'm making a bluetooth-controlled fire truck for my son based on an old wire-controlled truck I bought at a yard sale. It didn't have its wire-remote. I already got Arduino Nano to drive 2 motors ...
4
votes
3answers
324 views

Use network cable internal wires for Arduino project connections

I am new to Arduino and Raspberry Pi, and I have no eletronics knowledge outside of this. I have a good programming background. I just learned how to solder (basic), got my LCD working, my rain ...
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0answers
40 views

433MHz transmitter and receiver pair doesnt work [migrated]

I have a pair of 433 MHz transmitter and receiver: Transmitter is connected to Arduino pro mino, receiver to Arduino uno r3. Output of receiver on serial looks like that(it doest change much): ...
0
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1answer
90 views

Make stun gun with Arduino as oscillator

    Hello. I've noticed that for creating "sparks" with an transformer I need an oscillator. I want to know if I can use arduino for this. I'm afraid of breaking it because of the ...
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2answers
51 views

Interpreting CAN Bus Data from OBD Port

I'm using Arduino with MCP2515,2551 to read data from CAN bus over OBD port of my car, Honda Jazz 2012. From what I've read on other forums and OBD wiki, I can transmit the PID query to engine over ...
0
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1answer
45 views

3v wireless arduino and power consumption

I decided to create another post in order to get feedback for my ideas. I have created a network of wireless sensor nodes which connect to a central arduino with serial connection to a RPi. I ...
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0answers
6 views

Using C# Porgram to Interpret Keystrokes [migrated]

I am in the process of developing an arduino application that can read keystrokes from a PS/2 keyboard. I was wondering if it would be possible to upload a C# program onto the arduino to interpret the ...
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0answers
71 views

How can I perform power source switching using a P-channel MOSFET?

I am trying to build a power source switching circuit for an Arduino-based GPS tracking device/application. One power source is a solar-cell (rated at 1.5W and 6V) and the other is a 3.7V lithium-ion ...
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0answers
51 views

Control 12v 5A Pump using Arduino

I am currently developing a fluid controller using Arduino and a 12V 5A pump, whose speed can be controlled by a voltage input. From some google searches, I managed to find a circuit diagram that ...
0
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0answers
43 views

counting pulses from encoder on interrupt 0 pin every 50 ms [migrated]

I want to calculate the number of pulses coming from motor1 encoder pin2 (Int0) as input , and motor 2 encoder pin3 (Int1), I am working now for the first motor (just for the first motor ) so I set ...
0
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3answers
85 views

How to amplify voltage using op-amp

I want to measure a motor's load by it's current draw using Arduino, so I made this diagram: The Motor is controlled by a L298 H-bridge. My questions are : The motor's rotation can be reversed, ...
4
votes
1answer
195 views

Capture numbers entered during GSM call

I can't find any sources on how numbers are transferred during a phone call. I'm not talking about when dialing, but after the call is established. (like when you call an automatic bot and is given ...
0
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2answers
78 views

esp8266 throwing random symbols when powered and not responding to AT commands

I am trying to use ESP8266(ESP01) by interfacing it with Arduino using USB power. I followed the given tutorial. When I disconnect and reconnect ESP with Arduino it throws random symbols on the ...
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2answers
93 views

Audio amplifier controlling volume with Arduino?

I'm building a project that outputs audio via an Arduino to a powered computer speaker. This audio signal comes from a sine-wave-table lookup that I step through at various frequencies, setting a PWM ...
1
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2answers
41 views

How to use arduino and P-channel & N-channel MOSFET to control voltage to PT2264 address pins

Im looking to control a PT2264 RF transmitter module from an arduino so that I can transmit to different receivers. To do this I need to supply either +12v or 0v to the various address pins of the ...
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0answers
48 views

Are input and output grounds shorted in regulators/battery eliminator circuits?

I am new to electronics and I'm curious about something: Would there be any voltage between the input GND of a regulator (or a BEC), and it's output GND? In other words, is GND the same everywhere in ...
0
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1answer
44 views

What is a good resistance value for voltage divider to measure LiPo voltage with Arduino

(Full disclosure: I'm a newbie.) I'm trying to measure my 4S lipo's cell voltages using an Arduino Mega. I know that I should use a voltage divider (actually, several of them) and I think I ...
0
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0answers
41 views

Arduino ,How I can see the value (0 or 5) on my screen, where I connected my sensors output to analog input A0,A1.. pins [migrated]

I am working in my project and I want to see the output of my sensors as (0 or 5 ). the maximum read was 770 and the minimum read was 0 so ,How I can see the value (0 or 5) on my screen, where I ...
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0answers
37 views

led is getting on but not getting off and gsm sim900A not receiving sms continuously

hello sir i am using the Arduino code below to switch on led by receiving an SMS. Led is getting on but it is not getting off. i am using simcom sim900A gsm modem. please help me in this regard. ...
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0answers
61 views

What's the benefits between different interrupts on Arduino [migrated]

On an Arduino you can have several different interrupt types, two of them being RISING and FALLING. Looking past that RISING is from LOW to HIGH, and FALLING is the opposite, what are the benefits of ...
0
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2answers
65 views

Arduino digital input - Read voltage slightly higher then 5V - a power efficient solution [duplicate]

I need my Arduino to detect the state changes in a device - (ON or OFF). In order do do this, I have to check the voltage between two points on the PCB of the device. When the device is OFF, the ...
2
votes
2answers
94 views

Making a robot go straight using encoder motors and micro-controller (Arduino)

Now I have a simple chassis with two wheels which are powered by encoder motors. I connected Arduino Uno with the chassis and made a simple program to just count the numbers of signals (in simple ...
0
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1answer
46 views

Can decoupling capacitors be doubled up? Xbee + VR both have them

I'm using an MCP1700 low-dropout voltage regulator to power an XBee separately from my other Arduino circuit, because it can use up to 215mA all on its own. There are 1uF decoupling caps on both the ...
1
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1answer
96 views

Choose the right resistor for your RGB led (calibrate the colors)

Calibrate RGB leds with the correct resistor Playing around with some microcontrollers and multiplexed leds i noticed that i always need to fix the colors of each led rgb output softwareside... thats ...
1
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1answer
94 views

Handling audio signals on a 5v ADC

Some days ago I have made a multiplexed 3x8 LED grid based on Arduino RGB Controller. In my case I don't use RGB but row1, row2 and row3. While I already made some nice animations but I'm not really ...
1
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2answers
138 views

Can I bench test a N-channel MOSFET with battery, oscilloscope, and arduino alone (no applied load)?

I am having trouble getting some MOSFETs I have to behave like I expect, but I am just testing them with an oscilloscope, battery, and appropriately high voltage digital output on a microcontroller. ...
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2answers
75 views

What should I do if my MCU output is higher voltage than the Max Gate V on my N Channel MOSFET?

The V(GS) Gate to Source Threshold Voltage for a MOSFET I would like to use is listed as Min 1.5, Typ 1.9, and Max 2.3V. I am working with a Teensy3.1 that outputs 3V on the PWM pin. Do I need to ...
-1
votes
1answer
77 views

Why are LCDs and their controllers (HD44780, etc) hard to find as a consumer direct from their manufacturer? [closed]

I've been researching the development of an arduino-compatible with a built-in 16x2 character LCD, and have had no success finding anywhere to directly buy a LCD screen and the controller without ...
0
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0answers
35 views

How to (cheaply) generate a low voltage DC analog signal (+/- 14 to 70 mV). 1 mA/cm2

I am looking to generate a low voltage DC analog signal (+/- 14 to 70 mV). I was also looking to incorporate frequency modulation (voltage controlled oscillator?). Would I be able to achieve this ...
0
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2answers
46 views

TMP04 Temperature Sensor with Arduino Not going HIGH

I have a TMP04 temperature sensor (3 pin package). It outputs a square wave at approximately 35Hz and the duty cycle can be converted into a temperature reading (see datasheet). It has an operating ...