All Questions
0
votes
1answer
8 views
SD card shield not working on 3.3v
My SD shield works nicely on 5v supply, but does not detect SD card on 3.3v. Could someone explain the possible reason behind this? Could you also provide a solution for this?
I've worked with it on ...
-1
votes
0answers
9 views
Arduino-UNO Programming
I'm doing a surveillance project using arduino UNO, sd card module, OV7670 and PIR sensor but can't get the programming right. could i get a correct programming for arduino UNO
-1
votes
0answers
17 views
HC06 Bluetooth module. Press button to make discoverable?
From what I have found, the HC06 bluetooth module defaults to being discoverable whenever it is not paired with a device. Is there a way to make this device discoverable only after a button press? For ...
-2
votes
1answer
28 views
control multi adruino over the internet
I have three arduino in different locations (house 1, house 2, office) and I am trying to build a web application to control these arduino, what are the possible ways to distinguish between then over ...
0
votes
2answers
16 views
ESP8266 GET REPLY ERROR 501
I am trying to build a home automation system and i am unable to get data from a website using the arduino sketch, however i am able to get data from the website when i enter the AT commands into the ...
3
votes
1answer
59 views
Sending uint16_t over I2C
How do you transmit and read a uint16_t over I2C?
I'm trying to read two uint16_t values from a slave device, and I'm seeing nonsensical readings.
This is the code on my slave Arduino Uno:
#include ...
1
vote
0answers
12 views
Interfacing arduino with LabVIEW
I have already downloaded the arduino package for LabVIEW, MakerHub LINX, NI-Visa, and I've uploaded LIFA_Base to arduino, and it still does not work :(.
My questions are:
1) Do I need to upload the ...
-2
votes
2answers
29 views
How do i test whether my code fulfills the timing requirement?
I at the moment trying to interface to an stepper motor control board - (ST330-V3)
I wrote the code, but aren't sure how i should test it. Is there someway i could scope it, such that also can be ...
2
votes
1answer
27 views
Using an LM339 IC as a motor driver
I have an LM339 IC from Radioshack that I am hoping to use as a motor driver.
I read many resources on how the L239D can be used as one. I don't have enough circuit experience to truly know the ...
2
votes
2answers
31 views
Pinball - “All Lanes Lit” Bonus score is not behaving as expected
I'm trying to build a (very basic) pinball machine with an Arduino Uno. This part of the code will detect when a ball passes 3 lanes. When a lane is passed, it will activate the lane(laneState), ...
1
vote
1answer
15 views
Arduino Due: multiple TCS sensors
I am trying to run 2 TCS3200’s from one Arduino Due. Next, I must increase to 4 sensors. I need to read the data from the 2 digital pins but how do I read both within the same loop rather than in ...
1
vote
1answer
23 views
Object can't get the right value of its property
I'm doing a program for a robot and I got stuck at a weird problem:
I have classes defined for my robot's internals, for example for a StepMotor. I also defined a class for a Controller, which is ...
1
vote
0answers
36 views
Determining if an LED on another device is on
I'd like to check if this circuit I'm making is correct -- I'm concerned I'll mess up my Arduino. Essentially, I would like to determine if an LED on another device is on or not by measuring the ...
1
vote
3answers
30 views
Good voltage and resistor value for string of LEDs
I building multiple parallel strings of 4 LEDs in series.
Since the four LEDs in series have a combined forward voltage of 12.56V at 20mA, and it's powered by 2 AA batteries, I have added a voltage ...
1
vote
1answer
42 views
Use transistor to press button on external device
I have a small device with a simple push button. I'd like my Arduino to be able to make the device register button pushes. It seems like the best way to do this is to use a transistor to close the ...
1
vote
1answer
31 views
Why is LED lid when pin is set low?
I made this simple piece of code, to make my LED flash.. Which it does when the pin is set low.. But how does that makes sense?
#include "pins_arduino.h"
void setup() {
// put your setup code here,...
1
vote
2answers
42 views
AVR (Arduino Uno) Serial.print and Serial.println only printing 1 or 2 chars
I first used the Arduino IDE but now I'm using PlatformIO which is awesome. But I have some big trouble with Serial.print() and Serial.println(). To show this error I have the following example code:
...
-1
votes
1answer
16 views
Errors in code, LM35 temperature logging to web server
trying to experiment with Wemos D1 and LM35. Need to have temperature reading on the ESP IP. Found the following project to be exactly matching my requirements but I am having certain errors in it. ...
2
votes
1answer
25 views
Arduino mini pro as ISP for Atmega329P-PU serial monitor failing
After trying a lot of tutorials and manuals around the web including at least 20 solutions here on StackExchange, I don't know what to try anymore.
My goal is to write a message in the serial monitor ...
2
votes
0answers
30 views
Serial Communication Between 3 Arduinos Doesn't Work (Daisy-Chain)
In my project, I have to send a string from one arduino to a second arduino, and make it send the same string to a third arduino. I used UART and SoftwareSerial library, and connected the arduinos ...
0
votes
1answer
26 views
Is it possible to hookup two ultrasonic sensors to one Arduino Uno unit?
I found a couple of projects using Ultrasonic Distance sensor with Arduino Uno. Is there a way to connect two or more sensors on the same Arduino Uno?
0
votes
2answers
19 views
Arduino box stops working: Reading RFID tag and sending data over network
This is a simple Arduino program which reads RFID tag and sends the data over a network (lora).
The program works fine in as i run it, the arduino reads RFID and sends it over the network (lora)
...
0
votes
0answers
13 views
ZigBee poll after wakeup
I try to understand some ZigBee basics:
Given: Two battery driven ZigBee 3 devices. A window contact and a radiator valve actuator.
Use case: The contact gets a new state (e.g. CLOSED -> OPEN) and ...
1
vote
1answer
50 views
Help avoiding floating point math
I'm using a Texas Instruments DRV2605 haptic controller in my project to drive a LRA vibration motor. I would like to calculate the LRA rated voltage during run time using the formula below as ...
-1
votes
1answer
30 views
Using MPU9250 with ESP8266 without Arduino
I have an AI-Thinker ESP8266MOD on Lolin v3 board and a 9-axis sensor, MPU9250. I have seen many examples of using the MPU9250 with Arduino boards, but none with ESP8266.
How should I access the MPU ...
-5
votes
0answers
38 views
Scroll only one line & another line is fixed
I want to make humidity and temperature measurement display on lcd(16x2) where 1st row is fixed(showing Humidity) and 2nd row is scrolling(showing Temperature). Please send me the arduino code.
...
0
votes
1answer
39 views
Sensors to measure wrist bending
I'm working on gesture gloves project, which means it detect hand movement or current position, to be used in something else such as controlling a car.
I wanted to measure how much the wrist joint is ...
1
vote
1answer
42 views
Individual control of multiple RGB leds
I'm trying to control several RGB leds individually. So far I've been able to control multiple RGB leds using only 3 PWM outputs using NPN transistors as shown here (pic below).
I would like to ...
-3
votes
0answers
20 views
Draw arduino and rfid circuit [on hold]
I'm using isis 7 professional to draw the arduino circuit. however i cant find the rfid component in that program. ive search over the internet the rfid library for isis 7 but i found nothing. can ...
0
votes
0answers
9 views
connecting both ov7670 and hc05 to arduino
I'm trying to send images from the ov7670 to my computer and in response to the type of image send something back to the uno, I'm trying to send back to the hc-05 through Bluetooth but the serial ...
0
votes
1answer
37 views
Arduino Uno outputs 8V when pin is set to HIGH
I am doing the following in setup:
pinMode(13,OUTPUT);
digitalWrite(13, HIGH);
When I check with the multimeter, I get an output voltage of 8V rather than 5V. What may be the problem and how do I ...
-1
votes
0answers
6 views
MKR1000 and Nokia LCD5110
I tried to connect the MKR1000 to display nokia 5110 using libraries issued by Adafruit -Adafruit_GFX.h-, -Adafruit_PCD8544.h- but filling in the sketch generates errors.Can you give me some more ...
0
votes
0answers
11 views
can't find Nexion libraries for arduino
I'm new to Nextion HMI and i try to import the Nextion libraries for arduino it didn't work as expected can any know any reference for download the Nextion libraries for arduino
0
votes
1answer
39 views
How avoid TCP packet fragmentation?
I'm using an Arduino Uno with an Ethernet Shield and the arduino.cc Ethernet library for a custom TCP-based message-exchanging chat-like protocol. Specifically I'm using the Client class with its ...
0
votes
0answers
41 views
Simplifying my Arduino circut
I created a circuit to control the directions of two motors. I am trying to learn how to use this to eventually, if I get good enough, make a programmable auto tripod. So far I am learning to use ...
-1
votes
0answers
12 views
servo.h library and SeedRFID library conflict code
rfidreader works if i comment the myservo.attach(6);
#include <SeeedRFID.h> //rf
#include <Servo.h>
#define RFID_RX_PIN 2 //rf pin
#define RFID_TX_PIN 3 //rf pin
Servo myservo;//servo ...
-5
votes
1answer
22 views
Printing on LCD screen in different languages
I need to write to an arduino LCD screen in different languages like Japanese or Chinese.
Someone knows how?
0
votes
1answer
17 views
How do I convert program made on notepad to my arduino on proteus
I had the Arduino IDE but I accedentally deleted it. I have no internet connection, so I could not download it again. I do not currently posses the Arduino hardware itself but I do have proteus and ...
1
vote
2answers
22 views
WiFiClient.connect() does fail all the time (ESP8266 Core for Arduino)
I have one ESP(1) opening an AP and running a server on it. The other ESP(2) is running a client on it and is connecting to the AP and after that trying to connect to the host server. The connection ...
-1
votes
0answers
16 views
How do I run 6 motors and sensers for a Arduino mega?
I am building a robot and don't have much knowledge in electrical components. I was wondering if the arduino mega could handle 6 motors (the motors specifications are located bellow). I also was ...
1
vote
0answers
22 views
Arduino Mega 2560 from .org- which IDE works?
My personal choice is to purchase from the .cc (or adafruit) for new boards. YMMV. Craigslist locally of course has generic and .org boards now and then.
If I get a .org board on craigslist, will I ...
2
votes
3answers
40 views
Sending textual and nontextual data simultaneously across a serial port
I am currently using an Arduino Uno and creating an LCD simulator that works by sending LCD data through the hardware UART (serial interface). This LCD data is very short in length; in this case, it's ...
1
vote
1answer
43 views
Atmega328p programming with Arduino libraries
I'm trying to use the serial communication to work between a naked AVR Atmega328p and a computer (OS X and Linux Ubuntu).
I can program the atmega (using a pololu programmer), I make it blink a LED ...
4
votes
1answer
33 views
Motor running slowly when connected to digital pins, but fine with 5V pins
I am trying to connect a Dagu DG01D motor to my Arduino Uno. First I tried connecting the black wire to GND and the red wire to digital pin 7. My code:
void setup() {
pinMode(7, OUTPUT);
...
1
vote
1answer
35 views
Possibility of installing custom firmware from Arduino Uno R3?
I've been messing around with installing keyboard firmware onto my Arduino UNO R3 (I used this tutorial) and had an interesting idea: would it be possible to have this install custom firmware, ...
2
votes
1answer
26 views
ATtiny serial.print() crash with INTs
I'm trying to print some data to and from an ATtiny85 via serial, using the SoftwareSerial library. So far I've tried these setups with no results:
1/8MHz clock
baud rates from 9600 to 57600 (...
1
vote
3answers
59 views
Making three LED's blink at given times
I have a breadboard connected to an Arduino Uno, 220k resistors connected to an led, of course it has a common ground and a pin connected to 5v. All pins are digital.
Now, I want led 1 to turn on for ...
1
vote
1answer
52 views
Serial Communication Not Receiving Entire String
I have an Arduino connected to a pico motor driver that is supposed to take a number of steps for a specific number of triggers that gets from a source (i.e. waveform generator). I've setup the code ...
1
vote
1answer
20 views
Sending IR via a wire
So i have taken apart this old remote i found, and removed the IR-LED and replaced it with wires.
I thought that i would just be able to put the wire that used to go to the positive side of the IR-...
1
vote
0answers
30 views
In-application programming for the Arduino Uno
I would like to know if it is possible to read from and write to the microcontroller's (Arduino Uno's ATmega328P) flash memory using a program or "bootloader" previously stored in the flash memory (or ...
