All Questions
1
vote
1answer
10 views
I2C LCD Seral Interface Board not displayng text (wrong pins?)
I have a 1602 LCD screen that works fine on it's own. However I wanted to free some pins by using an I2C / IIC LCD controller I purchased separately.
While the controller seems to be communicating ...
0
votes
2answers
17 views
Using an Arduino as an input device
I had an idea to create a control panel using an arduino and some buttons. How would I go about making the arduino emulate an input device so that when I press a button connected to the arduino, it ...
0
votes
0answers
5 views
DS1307 RTC conflicts with DS18B20
I'm working on a project to output the temperature from a DS18B20 to a 16x2 LCD while logging the temperature to a CSV file using the Adafruit Data Logging Shield. I keep getting this error when ...
0
votes
1answer
10 views
Use website to communicate with Arduino WirelessProtoShield
I have a small office with wireless network, is it possible to make a wireless doorbell?
Practical example:
Arduino is connected to the main wireless network and has a static ip,
i have a website that ...
0
votes
0answers
16 views
Cannot get ECG readings from heart, but I do when I poke at the leads [duplicate]
I have a minor issue with my ECG. When I poke at the leads, I get a reading. But when I hold the leads or place it near my heart, I don't get anything. I'm pretty sure this is hardware related, but ...
0
votes
0answers
15 views
EFCom GPRS/GSM Shield
I have an EFCom GPRS/GSM Shield
http://www.elecfreaks.com/wiki/index.php?title=EFCom_GPRS/GSM_Shield
and I am using it with a mega 2560. The problem is that the code in the wiki page
//Serial Relay ...
0
votes
3answers
44 views
Can the Sparkfun AVR pocket programmer bootload/program a 3.3 V ATmega328p
The product in question - https://www.sparkfun.com/products/9825 - operating at 5 V (and can also supply it to the device being programmed).
I need to program the bootloader onto a 3.3 V ATmega328p ...
0
votes
0answers
19 views
Arduino serial communication broken. Possible due to short circuit
So I have a project I'm working on where I have about 6 arduino boards communicating with one another through cables. I've been testing them using a regulated DC PSU and at some point I caused a short ...
1
vote
1answer
21 views
Help with parts identification from arduino starter kit from aliexpress
Ordered an arduino starter kit from aliexpress Link
The parts list they provide (as a jpg on the order page) is vague and not very descriptive, I've gone through most of the parts and am down to ...
0
votes
1answer
34 views
What's the smallest Arduino board with wifi capabilities? [on hold]
The Photon from Spark IO looks super small. Are there smaller wifi enabled microcontrollers available that can be programmed with the Arduino IDE?
0
votes
0answers
35 views
MPU-6050 giving strange data
I'm using an MPU-6050 chip in order to calculate orientation. It is connected to an Arduino Pro Mini. I am using code written by Jeff Rowberg that uses the internal DMP. The 57600 baud rate crashes ...
1
vote
1answer
43 views
Serial interrupts?
In a project, I’m using an EIA485 bus to send encrypted data packets. That works with Arduino’s buffered serial, but it is kind of awkward, and I’m using none of the more complex stuff in that class ...
3
votes
1answer
34 views
Choosing right Sleep state
I'm planning on building an LED clock, but I want it to be lit only when I press the POWER button on my remote control. Using an IR receiver, which Arduino sleep mode should I use to reduce the ...
2
votes
1answer
66 views
Arduino motor shield will only work in one direction
I have this Arduino motor shield which is hooked up with two DC motors. The board is the same as this one from Sparkfun.
A PWM output controls the speed of the motor, and a digital out controls the ...
1
vote
1answer
29 views
Data Report Which Technology
I want to create a small position reporter for cars. I found some good GPS Modules with which i could collect data. But i'm unsure with what technology i should send the data.
A possibility would be ...
0
votes
0answers
16 views
Memsic Accelerometer not returning T value
I hooked up a Memsic2125 accelerometer to a Arduino Uno. X and Y values are returning fine, but the T value is returning -4000 every time.
// these constants won't change:
const int xPin = 2; // ...
0
votes
1answer
41 views
Compilation error when trying to give pointer to a function to another function
I'm trying to write a library for Arduino using the Wire library.
Here's my code:
PiCom.h:
#ifndef PiCom_h
#define PiCom_h
#include "Arduino.h"
#include <Wire.h>
class PiCom
{
public:
...
1
vote
1answer
86 views
Can I use the setup() function inside the loop() function
In the normal case the setup() function will be run once automatically and and then the loop() function will run many times.
I want to initialize several modules in the setup() function and then in ...
0
votes
1answer
52 views
Read temperature (DS18B20) with the ATTiny85
I'm trying to read the temperature of a DS18B20 with my ATTiny85 - but I'm getting rubbish data :D
I should have gotten ~22 degrees, but I'm getting 129! I followed this tutorial i found here, but ...
0
votes
1answer
41 views
How does the Light Controlled by Photoresistor(LDR) + Arduino Works? [on hold]
How does the Light Bulb Controlled by Photoresistor(LDR) + Arduino Works ?
I can understand , if the Darkness increases(Daylight Decreases) the Arduino then starts the Light Bulb and if Daylight ...
2
votes
1answer
24 views
Discrete H-Bridge very low current output
I have built two parallel H-bridges from "Design 1" on this page as you can see in the attached schematic.
However when I apply the external power (VCC1 in the center of the diagram) the two motors ...
0
votes
2answers
28 views
how to make arduino as mind thought reader?
I'm trying to create arduino base mind reader... And for that I thought that EEG electrode connected to arduino and then the data send to arduino in 01 form .. But I facing problem in how to convert ...
1
vote
2answers
51 views
How to attach interrupts to Arduino UNO timers?
I understand there are 3 timers on the Arduino UNO. What specific registers do I need to use to access them?
My goal is to use these timers to poll different sensors I am using with a ms period. Are ...
0
votes
1answer
63 views
too few arguments to function 'void setColor(int, int, int)'
When I put "c" inside setColor(c);
it tells me:
error: too few arguments to function 'void setColor(int, int, int)'.
I understand that I should put 3 arguments. What I don't understand is that the ...
1
vote
1answer
14 views
Audio Frequency White Noise generation using Arduino Mini Pro
For DIY, how to program Arduino Mini Pro to act as an Audio Frequency White Noise generator?
Presumably,
a) using one Digital Output pin
b) feed to a simple passive RC low pass filter to reduce ...
1
vote
1answer
29 views
5 Switches 1 AI pin
Im starting to get into Arduino a little. Ive got a Small project to start me off,
To keep it simple its: 5 level Switches, 1 flow switch and 3 solenoid valves.
This question is for the Level ...
1
vote
1answer
56 views
Is SoftwareSerial left out for the ATTiny85/84?
I want to use SoftwareSerial with my ATTiny85 and when I google it several projects claim that they are using it... I downloaded the hardware from https://code.google.com/p/arduino-tiny/, but when I ...
0
votes
0answers
16 views
Daisy Chaining USB Communication over Arduino Due
I have two Arduino Due boards. I would like to connect one to my computer through the programming port as USB Serial so that I can send it commands, but I would like it to also be able to communicate ...
0
votes
1answer
18 views
Arduino UNO GPS module
I am thinking about buying a gps module for Arduino UNO.
I would like to install it on a self-build RC-car which is also controlled by Arduino.
The problem is, I cannot install the gps module on the ...
2
votes
1answer
43 views
Attiny85 and 433Mhz RF
I have this cheap RF link that I had working with the Arduni UNO, but I wanted to make it smaller and ATTiny85 should do the trick. The RF module is connected (data pin) to PB3 on the ATTiny.
But I ...
1
vote
0answers
15 views
Arduino Pro Micro clone not recognized, flickering RX LED
I have an Arduino Pro Micro clone that seems to be in some sort of reset loop.
The RX LED is flickering very fast and very dim.
The power led also seems to flicker at the same frequency but has normal ...
1
vote
1answer
21 views
Powering Arduino from a shield
I'm designing a shield for Arduino which drives two stepper motors. They are small and require 5V but their max combined current is around 1A, way too much for the USB supply. Therefore I will have ...
1
vote
1answer
24 views
Arduino Yun RFID-RC522 module not working
I have tried to use Arduino Uno with RFID-RC522 module. It is good work[1] and read rfid cards. But Arduino Yun doesn't work with RFID-RC522 module.
What is diffrent Uno and Yun?
1- ...
1
vote
2answers
213 views
Photoresistor is not working, is there something wrong in the code?
I am trying to make the photoresistor work in a simple project.
The project is as follows:
The LED light should light up brighter and brighter as the photoresistor reads less light in the room.
The ...
-1
votes
1answer
12 views
arduino wifi shield not present error
I'm using an HLK-RM04 WIFI shield and arduino uno R3 board. whenever I mount my shield on the uno board and connect it to the pc using a usb only the power led(red) of my wifi shield glows. I tried to ...
0
votes
1answer
22 views
SD Initialization Failing
I am using a SEEED SD Card Shield. Everytime I attempt to write the card, I get
When Using File> Examples> SD > CardInfo:
initialization failed. Things to check:
* is a card is inserted?
* Is your ...
3
votes
1answer
85 views
What are the benfits of global variables over static class members?
On an embedded system we use global variables often to keep dynamic memory consumption on heap and stack low. But global variables are also considered bad programming practice if they aren't used in a ...
0
votes
0answers
30 views
How to rotate a servo continuously?
I'm new in robotics. I bought a mini robot ( Link ), which i rebuilt a little. Now it has legs and arms. This little robot has 4 little servos (Link). There are two wheels attached to two of these ...
0
votes
1answer
61 views
Why does Arduino use USB A-B plug, instead of A to micro USB plug?
I understand that A-B plug used to be common but they could have switched to micro without issues.
My questions:
Why does Arduino use USB A-B plug, instead of A to micro USB plug?
What are the ...
1
vote
2answers
43 views
Serial debug output looking messy
I've got this quite basic code running on an Arduino Mega 2560, and the output is looking like I have the serial settings wrong, though I can't work out what to change.
void setup()
{
...
0
votes
1answer
32 views
RCSwitch on Attiny85
I would like to use my Attiny85 as an remote controlled relay switch.
I have already tested the sketch on my Atmega328 and it worked.
Now I wanted to burn the sketch on my Attiny85 using ArduinoISP ...
1
vote
1answer
30 views
Servo motor swinging back to 0°
I just got my arduino and servo. But my servo may be acting strangely.
Whenever I tell the servo to go somewhere it keeps going to 0 than to that position and stops after 10-15 seconds or more.
...
0
votes
3answers
42 views
Can an Arduino Micro recieve commands from another microcontroller when hardwired together?
I plan to build functioning reaction wheels, controlled by an Arduino Micro. Ideally, I'd like to have the reaction wheels, and the micro, be a single unit which would receive external commands from ...
0
votes
1answer
36 views
Is there a radar - like sensor that can tell me the distances of multiple things around the sensor?
I'm trying to develop something that requires accurate distance measurement of objects around the center of the contraption. However, I cannot find any way to achieve this other than using a bunch of ...
0
votes
0answers
12 views
avrdude: stk500v2_ReceiveMessage(): timeout with ADDAC VCC
I am getting the above error message uploading the ADDAC VCC, and the only thing that's changed I think is the patch is bigger.
Is there a fix for this or will I have to send it back?
1
vote
1answer
40 views
control a jack/cylinder to open/close a window
I want to open the window to let the cat enter or go out, but the mecanism of the window may me think that the best way should be to use a jack/cylinder (I don't know what term is more appropriate in ...
0
votes
1answer
53 views
Raspberry Pi with Arduino, Serial connection stops working
This is the hardware set-up at home,
Raspberry Pi GPIO -> Logic Level Converter -> Arduino -> Multiple Relays
I am running Raspbian and NodeJS on the Pi while the Arduino is loaded with ...
0
votes
3answers
48 views
Program got so many errors about expected ) or ; before either
This is my first time to try program arduino, and I am clueless. I have a friend who told me about things work, and he told me the programming language is C (or similar to C) which we have learned in ...
0
votes
1answer
27 views
IDE support for Arduino micro
I have an Arduino micro http://arduino.cc/en/Main/arduinoBoardMicro I was looking to know which is the lowest version of the IDE that support it. Actually on the IDE 0023 is not present in Tools > ...
-1
votes
2answers
46 views
Read all Digital input in arduino once time and sent theme to serial
i need to read all Read all Digital input in arduino once time; example:
Serial.write(digitalRead(0),digitalRead(1),...,digitalRead(13));
to receive state of all digital pin in one times from my ...
