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0answers
8 views

Piezo into 0-5v ADC, with offset center voltage?

I want my piezos to have a center voltage at 2.5v for a 0-5v ADC input on Atmega328, so it can sense force in both ways - one way would be >2.5v and the other will be <2.5v. Will this circuit ...
-2
votes
0answers
10 views

driver motor dc connect to arduino?

please help me make a dc motor driver with a large current (10A) with a relay that is connected to the arduino and code. by using two buttons Thank you
-2
votes
0answers
13 views

rfid and arduino

I want to ask, I want to create a project using RFID barrier gate. I want the way it works when the RFID is scanned then the bar will be open 90 degrees, and after the vehicle passes through the ...
-1
votes
1answer
41 views

Question about Vcc

I am working with an Arduino Mega 2560 and have an sensor connected to it. I have read instructions about how to write code to read the supply voltage, Vcc, immediately prior to executing analogRead, ...
0
votes
1answer
14 views

Burning Arduino Leonardo Bootloader to ATmega32U4 with 8MHz internal clock

Burning question: So, I'm trying to burn the Arduino Leo bootloader onto a ATmega32U4 that's on 3.3V and the internal 8MHz clock. Do I have to modify and rebuild the bootloader to set the fuses ...
0
votes
1answer
39 views

Homemade PC EKG circuit

About a week ago I had an idea to build a computer EKG using the computer's mic input as a signal input. One of the most complete tutorials I found on the internet was this one (that is applicable on ...
-2
votes
0answers
52 views

Arduino Tx / Rx pins, what type of protocol is it?

When you use the Tx and Rx pin in the arduino and plug that into another Arduino what type of protocol is that ? i myself am looking to build a similar system on a humanoid im putting together and in ...
0
votes
2answers
50 views

Amplify Pizzo Buzzer

I have an Arduino pro mini connected to a Lipo 3.7 battery. I am using a pizzo buzzer connected to a Ultrasonic sensor, the buzzer only makes small clicking sounds, I assume this is due to lack of ...
0
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0answers
30 views

Measuring touch-weight resistance in piano keys

Piano technicians, such as myself, use an old, labor intensive way of measuring touchweight resistance in piano keys. I would like to automate this process electronically. This is an explanation of ...
-2
votes
0answers
22 views

Beginner Projects for Arduino Uno and Raspberry Pi [on hold]

I'm an absolute beginner in doing stuff with the Raspberry Pi and Arduino(Uno). Actually, I just got them yesterday. I was wondering if there were any beginner projects for them. I would prefer if the ...
0
votes
0answers
22 views

Optimizing an Arduino code [migrated]

I am working on project and using Arduino Pro Mini (Atmega328p running on 2xAA) to measure the time to charge a capacitor (when the volt level is high). This is the code I used while testing: ...
0
votes
2answers
64 views

Implementing Safety Shut-Off Relay In Project

I am working on a project which I have poured lots of cash into that involves water, pressure and electronics in very close proximity of each other... Lately, I have been considering adding some ...
-1
votes
1answer
39 views

Infrared Door opener

I have a case here, in the main entrance corridor, we have a door which have an automatic door opening mechanism if you push a button. There is also an IR receiver, I was planning to make a ...
-1
votes
0answers
32 views

ESP2866 Style controller but 5GHz [on hold]

So I'm looking into using the ESP2866 for some projects but I noticed it operated in 2.4GHz. Is there a cheap alternative that supports 5GHz?
0
votes
0answers
5 views

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: ...
0
votes
1answer
44 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
votes
0answers
32 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
vote
0answers
49 views

Raspberry Pi GPIO pin layout + Cooking Hacks Shield [migrated]

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. ...
0
votes
0answers
16 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 ...
0
votes
1answer
25 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 ...
0
votes
1answer
55 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 ...
1
vote
0answers
38 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 ...
0
votes
0answers
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 ...
5
votes
2answers
259 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 ...
0
votes
1answer
97 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
votes
1answer
88 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.) ...
0
votes
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
votes
1answer
50 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
votes
3answers
63 views

sd mp3 player board *Christmas Present Project* [closed]

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 ...
-1
votes
0answers
53 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
vote
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
votes
1answer
57 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
votes
1answer
55 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
votes
0answers
58 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
votes
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
330 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 ...
0
votes
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
votes
1answer
92 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 ...
1
vote
2answers
54 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
votes
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 ...
0
votes
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 ...
0
votes
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 ...
0
votes
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
votes
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
votes
3answers
87 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
196 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
votes
2answers
85 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 ...
1
vote
2answers
95 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
vote
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 ...
0
votes
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 ...