Be sure to use the Arduino Stack Exchange for questions that are more Arduino and less electronics.
0
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0answers
2 views
3-wire SPI Interface between Arduino (Teensy 3.1) and Accelerometer (ADXL344 or ADXL345)
I'm having problems in interfacing and receiving data from the Accelerometer (ADXL344) to my Arduino (Teensy 3.1).
I have connected the pins as shown in the attached schematic.
Furthermore, I have ...
4
votes
3answers
37 views
Simple ADC alternative by using a capacitor and digital Arduino pin
I'd like to measure a dozen potentiometers with an Arduino UNO. Unfortunately, the UNO only has 6 analog pins, but it does have about a dozen digital pins.
Could I effectively measure an analog value ...
0
votes
0answers
6 views
Seeedstudio Wifi shield v1.1 Not working with Arduino Mega 2560 [migrated]
I have been trying use the Seeedstudio wifi shield v1.1 with Arduino Mega 2560 as part of my project but I could not make the WiFly library provided on the wiki work with the Mega. I tried to run the ...
0
votes
0answers
17 views
How to do Serial monitor with Arduino Yun? [migrated]
I'm trying to read some values from a TCS3200 colorsensor using Arduino Yun. I have some code, which you can see below, that I used when I tested on the Uno.
With the Uno everything worked fine and I ...
0
votes
0answers
8 views
Arduino/C++ byte manipulation [migrated]
Consider this scenario, I have a single byte of data; I have to use the 8 bits it is composed of to generate 4 extra bits from it.
Now, my problem is that I have to store this data somewhere while I ...
0
votes
1answer
36 views
matlab image processing supported microcontrollers [on hold]
I'm a mechatronics engineering student. I'm working on a senior year project related to computer vision in matlab, specifically real time object recognition. I have created a code for object ...
1
vote
0answers
50 views
Reading an ABS wheel speed sensor
I am trying to use an Arduino to intercept and send out modified wheel speed readings on a 2014 Subaru Forester. The problem I am running into is the wheel speed signal.
From what I can tell the ...
0
votes
1answer
30 views
Bluesmirf sparkfly bluetooth HID Radio
I am looking to connect this Bluetooth radio to a FTDI Basic sparkfun so I can program it's baud rate through TERA Term, but I cannot get it to switch from HID to SPP I was supposed to order the Gold ...
0
votes
1answer
44 views
problem of transmitting data from serial device to bluetooth on Arduino
I am using an accelerometer which uses serial communication on Arduino (UART), I wish to transmit the data to a bluetooth module (blusmirf gold) using I2C and finally read it from my android ...
0
votes
0answers
28 views
Using arduino for a hanging scale [on hold]
Is it possible to connect an arduino to a load cell and measure weight?. I have a Sbeam load cell which I am trying to hook up as a hanging scale.
0
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0answers
8 views
Ethernet shield not getting IP [migrated]
I am just running the below DHCPAddressPrinter sketch in Arduino example to setup EthernetShield with MAC and IP
...
0
votes
1answer
50 views
how can we detect overspeeding through sensor or by building up circuit ??
I am working on project to detect overspeeding through sensor.
but i am not getting any information regarding sensor.
All i want to do, sensor inside vehicle with arduino and gsm which will send out ...
1
vote
0answers
47 views
Anakog Input not going zero [migrated]
Arduino Uno user here
I am building a project with 4 analog inputs A0 dose not work. A1 A2 and A3 work perfectly fine! But for last input when I connect to A4 or A5, then they do not go to zero. They ...
1
vote
0answers
18 views
Arduino unstable analog reading when using power supply [migrated]
As soon as I unplug my Arduino from USB and only use the VIN pin with my 9V power supply, the analog readings from my arduino start to get unstable, which means the value fluctuates much more than ...
2
votes
2answers
49 views
How do i count a fluctuating 22.1v (11.5v) pulse from reed switch with Arduino?
It has come to my attention that my first description of my problem was very cryptic, so I have tried to rewrite it for better understanding.
I have an actuator that measures 8 pulses/rpm and there ...
0
votes
0answers
4 views
Operate Arduino Nano using variable voltage [migrated]
How safe/dangerous is it to operate an Arduino Nano 5V with a varying voltage source?
I have a circuit that provides a duration of power with a starting voltage of 5.3V and an ending voltage of 4.5V. ...
-1
votes
0answers
5 views
Which Arduino is compatible for atmega164pa [migrated]
I am working on a project using 5 pins of ADC, 5 pins for PWM, and LCD. I need to use Atmega164pa. I would like to know how I can transfer it to Arduino. Is there any Arduino compatible with this ...
0
votes
2answers
60 views
How to connect a stepper motor with exactly 4 wires to Arduino?
simulate this circuit – Schematic created using CircuitLab
Today I bought a stepper motor to play with, after 12 hours of struggling with it, I haven't been able to figure out how to ...
0
votes
1answer
73 views
Blood pressure algorithm [on hold]
I am testing the proof of concept for an IOT smart watch. Is there an algorithm for calculating Blood Pressure if the smart watch is on the person's wrist? From the algorithm I can determine what ...
1
vote
3answers
89 views
How does the Arduino compare to PIC and AVR for serious learners
I'm trying to get into microcontrollers, but as you might guess, choosing the first microcontroller to start with is a difficult task due to the many great choices available.
I have studied ...
-2
votes
0answers
32 views
Can(and if I can how) I make 2D pong using LED matrix, a shift register and an arduino? [on hold]
I have LD-1088BS 8x8 LED matrix,a 74HC595N shift register,an Arduino Uno and a desire to make 2D pong game using this components.Is this possible and if it is can you please send me some example code? ...
0
votes
1answer
37 views
Amplifying a 100mV range (sinosoidal wave) to a range of 0 - 3.3V for the Arduino
I have a partial discharge wave form which varies between -100mV to +100mV. For simplification, I am using a sinusoidal wave with that range. I need to amplify and bias this signal between the range ...
-1
votes
0answers
49 views
Design a 32-bit develpment board [on hold]
I am really interested in design a 32-bit development board. I have already designed a couple of 8-bits development boards, using Atmega 328, Atmega 32u4 and Attiny85. I have always used the Arduino ...
-2
votes
1answer
14 views
arduino based multiple ultrasonic with range variable output for each
I'm new to Arduino but have been an analog electronics tech for over half a century. I'm trying to prototype an Arduino based personal navigational device for blind user utilizing multiple ultrasonic ...
0
votes
0answers
30 views
Arduino UNO not working with L293D
I am creating a simple robot that is controlled by an Arduino UNO, and given instructions by a button matrix.
One can press 4 buttons for Forward, Backward, Left and right on on the matrix array, ...
1
vote
5answers
51 views
Using Arduino-UNO to control LED pins Greater than the Number of I/O Pins
Our class have been given a project to create a miniature of our department building. It will have 11 laboratory rooms, 1 server room, 1 faculty room. Each laboratory room will contain 18 pc's, each ...
0
votes
0answers
10 views
Using an Arduino uno to program a standalone ATmega2560 [migrated]
I have successfully programmed standalone ATmega328p using arduino uno by adding following lines in the boards.txt file:
...
0
votes
0answers
5 views
arduino mega number of simultaneous pulse inputs [migrated]
I'm looking at this specification page:
http://arduino.cc/en/Main/ArduinoBoardMega2560
It says there are 54 digital input pins. How many of those can be used at the same time to measure pulse input ...
-2
votes
1answer
98 views
Current Measurement Problem [on hold]
I'm trying to measure the current through a DC motor but the things aren't working as expected.
First, let me say that I can't do the measurement with an ammeter. I also don't have a current sensor. ...
2
votes
1answer
362 views
9 Volts battery is draining fast in Arduino
I am currently working on a project using Arduino UNO and two 3 volts DC motors. I chose a 9 V Goldtop battery to power my two motors. The two motors seemed to work fine until after some time, a very ...
0
votes
3answers
98 views
Anything Wrong with my Light box Design?
I am creating a custom box that will contain 3 * 400 watt metal halide bulbs (1200 watt total). The box will remain closed for 60 minutes, open for the next 60 minutes, then closed, then open and so ...
0
votes
1answer
27 views
Arduino Serial Error Correction
I currently have a setup where I take serial output from Arduino 1 and push it through a transmitter to the receiver of Arduino 2 where it is fed back into the serial input and further processed. I ...
0
votes
1answer
36 views
DH-11 Sensor on a Raspberry Pi & Arduino
I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit:
...
0
votes
3answers
33 views
Voltage range of a differential pressure sensor px26, and opamp saturation
Im using a px26 001GV differential pressure sensor for a project with arduino, here is the data sheet. (http://www.omega.com/manuals/manualpdf/M1608.pdf)
Now, I have few questions regarding this.
1) ...
0
votes
0answers
23 views
TSL230 vs TSL235 Light Sensor Issue
I have both a TSL230 and TSL235.
My issue is that the TSL235 saturates under direct sunlight since the datasheet says it cannot handle the light. So I flipped over to using a TSL230ASD since it has a ...
0
votes
0answers
17 views
ISP isolation between ATMEGA32U4 and MPU-9250 while programing
I am experiencing problems with ISP programming on a custom Arduino Micro board. I am sharing the ISP connection (SPI) with a MPU-9250 IMU.
I have added 1K resistors between the line, but the ...
0
votes
1answer
32 views
Powering up arduino with Xbee and a 6V (run on 5V) motor
I am working on a small project where i'll need an arduino to control a motor wirelessly using Xbees.
I have a 7.4v lipo battery
I am wondering will there be a problem or insuffciency if i only use ...
0
votes
0answers
58 views
Collision direction using an accelerometer
I'm trying to determine the direction on a vehicle that a collision occurred. After some threshold value is met I've tried a couple of different approaches to determine which direction the collision ...
-3
votes
0answers
45 views
Aerospace graduate program with Electronic engineering B.E [closed]
Is it possible to attend a graduate program in aerospace after an electronic engineering bachelor ? Not to work in communication and electrical power supply, but to work in something more related to ...
3
votes
2answers
160 views
Creating a loud cracking sound to scare cats away forever and ever
So we have some hardcore cats in our area, recording their glorious conquests with excrement. They don't scare easily. I'll be conducting psychological warfare, they must start associating some form ...
0
votes
1answer
65 views
Read Values from a Speaker
I am using Arduino UNO and did a project to sync LED to audio. I am not sure how to read a value from a speaker.
I connected a LED to Pin 9 (PWN) with 220ohms and ground. I connected A0 pin to a ...
0
votes
1answer
118 views
Do I need a resistor when controlling an ESC with an Arduino?
I am planning to connect one of my arduino's PWM pins to the input pin of an esc and the GND pin to the GND pin of the ESC, which in conjunction with the servo library should allow me to control the ...
0
votes
1answer
86 views
Any good microcontroller with highly accurate ADC for voltage and current measurement? [closed]
I have to build up a battery cell(single) monitoring system which can calculate the cell's (single) efficiency which should be atleast 0.1% - 0.5% accurate. The cell would be charged over a couple of ...
0
votes
0answers
6 views
ATMega328P-PU and 328P-AU [migrated]
im planing to make my very own arduino design based on the Arduino PRO mini. I picked this board instead of the UNO mostly because it's way more simpler compared with the UNO since the USB-to-Serial ...
0
votes
0answers
11 views
Arduino Sainsmart uno communication problem [migrated]
I'm trying to communicate with my arduino uno but it seems to have troubles to understand characters. For example, printing things with Serial display weird things, changes characters, removes some.
...
0
votes
2answers
61 views
SPI Troubleshooting, Teensy, Arduino, and tri-state
I'm trying to get my SPI bus devices up and running on a custom circuit board that I've soldered together. Unfortunately, I neglected to add probe testing spots on this particular circuit board, and ...
0
votes
0answers
10 views
What bytes do I send to the MAX7221 to light an LED (in an led Matrix)? [migrated]
Datasheets
LED Matrix (p2): https://www.circuitspecialists.com/products/pdf/M105057CHR1.pdf
MAX7221: https://www.sparkfun.com/datasheets/Components/General/COM-09622-MAX7219-MAX7221.pdf
...
-1
votes
1answer
53 views
Switching on and off an IC7805 voltage regulator with Arduino? [closed]
I have been trying to control on/off of voltage regulator with the help of an Arduino pin by placing PNP, NPN and even opto coupler in the circuit. But the output is not as expected. I have given a ...
0
votes
1answer
44 views
Connecting components to an arduino without a breadboard
I've never worked with an arduino before, so bear with me.
I'm looking to start a project with an arduino nano, and I want to keep everything as small and as light as possible. Because of this, I ...
3
votes
3answers
662 views
Why drive a relay with a transistor switch?
It appears most people drive relays through a transistor rather than directly from a digital output pin on an Arduino. I had wired the output pin directly to my relay before realizing this and it ...
