Tagged Questions
1
vote
3answers
63 views
What is SPI Interrupt (SPIE) in SPI control register?
I have been trying to understand SPI Interrupt i.e. what does it do and why is it used ? Reading about it on the web has not helped me. Can some one please explain it in a simple terms ?
1
vote
0answers
10 views
Controlling Floppy Disk Drive with Arduino [migrated]
I am having problems controlling a 3.5" Floppy Disk Drive with an Arduino Uno.
I have the floppy disk drive powered with a computer power supply that is switched on, and the Arduino powered by my ...
1
vote
1answer
57 views
Controlling various Arduinos with Android
I have an upcoming project which requires me to use about 8 different Arduinos, probably more. They all perform a light show which turns off and on various LEDs at different timings to simulate a ...
0
votes
0answers
42 views
How do I trigger a 1 wire capacitive touch button?
I have a lighting controller in my house for my under cabinet lights. It has a capacitive touch remote button with a 1 wire interface to the controller. How can I trigger this 1 wire remote with an ...
0
votes
0answers
27 views
Timing Issues When Interfacing with E28F800 Flash Chip
I'm trying to interface with an E28F800 via an Arduino Mega and am having trouble trying to program it. I'm successful in reading off the chip by toggling CE# & OE# while asserting an address, but ...
3
votes
3answers
346 views
What is an easy way to program an ATtiny microcontroller in C without an ISP?
I understand the "most raw" method to program an AVR microcontroller is probably with an ISP such as the AVRISP mkII.
However, I'm after a method that doesn't involve me having to purchase a $40 tool ...
2
votes
2answers
180 views
ATmega328P running on CR2032 has issues with timing/sleep code as voltage depreciates over time
I have an ATmega328P running at 16 Mhz on CR2032 with a few sensors and radio for about a week now. It started out at 3+ Volts and is currently measuring at 2.96 Volts. At present, I am not using ...
0
votes
0answers
28 views
RN 171 UDP Configuration not working?
I am trying to use a RN 171 module to send Data using UDP. The RN 171 is connected with a voltage regulator and this is connected to the laptop. I did all the configuration
looking at the data sheet:
...
1
vote
1answer
127 views
What is the 'best' way of communicating with small microcontrollers/devices?
var best = "simple & cheap";
I have a server in my apartment that I have an XBEE hooked up to. I use it to communicate with another XBEE plugged into an Arduino. I am trying to hook up many ...
1
vote
1answer
176 views
Count the number of times a button is pressed using ATmega
I have to count the number of times a button is pressed in 5 seconds and display it on an LED array.
If the number of times the button is clicked is 1 then the last LED should glow (...
3
votes
1answer
125 views
Controlling motor direction, usage and speed
I want to build a machine that can follow a set of simple rules by which it controls a motor. These rules are yet to decided, but the patterns are as follows:
Turn motor clockwise for ...
0
votes
2answers
118 views
How to measure microvolts of biopotential with Arduino?
I'm new to electronics, so don't judge me harshly. I need to measure the biopotential of a human. I will place special electrodes on the skin, and need to measure the voltage on it. Ordinarily, the ...
0
votes
1answer
121 views
Going from Breadboard to PERMANENT circuit but have Arduino shields attached?
I have made an Arduino project that uses a shield. I am now trying to turn it into a permanent circuit.
I have flashed the microcontroller with the program, and I have all the parts I need to solder ...
1
vote
2answers
102 views
Interfacing without an Interface
I have a project where I need to interface with a machine that was never built to be interfaced with.
I basically want to programatically press physical buttons on the machine(critical) and also ...
0
votes
3answers
111 views
Reprogram a calculator to a cash register
due to the "high cost" (at least from my point of view) of a thermal printer I was wondering whether it was possible/worth the effort to buy a compared cheaper device with it integrated already (a ...
0
votes
1answer
139 views
Which transistor should I use in place of a 5V relay to adjust brightness of lights (230V) with the Arduino?
I want to control brightness of lights (230V) with the Arduino, and I know that relays will just switch the lights on/off. If you have the circuit or any idea about which transistor to use and how to ...
-1
votes
1answer
143 views
Can I turn normal speakers into wireless Bluetooth speakers with Bluetooth modules? [closed]
I want to turn my simple wired speakers with 8mm audio jack to wireless Bluetooth speakers which can be operated from an android Smartphone with Bluetooth module and microcontroller.
(Sorry for my ...
2
votes
1answer
149 views
FPGA or microcontroller for this robot
I am at a loss of whether I need to use an FPGA or a microcontroller.
I need to build a robot that can chase my cats around and shoot them with a water gun. So there seems to be a number of parallel ...
2
votes
1answer
121 views
How can I control brightness of a CFL with a microcontroller?
I'm new to electronics and just turned on and off appliances with an Arduino and relays. Now I also want to control the brightness of a CFL with an Arduino as I controlled the brightness of a LED. So ...
2
votes
3answers
212 views
Attiny44A Arduino Multitasking
I am trying to blink a led as well as switch a motor on/off parallely using attiny44A below is my code:
Pump Controller:
...
1
vote
3answers
241 views
NPN BJT Relay Circuit will not turn off
I'm applying a 3.3V signal with my Raspberry Pi to the base of an NPN transistor to activate a SPDT 6V relay (relay data sheet, model G2R-1-S-DC6(S)). The relay pickup/dropoff voltage is 4.4/0.9V. ...
0
votes
2answers
58 views
Button cells for arduino uno
OK, before I start I know that there is significant difference and that the Arduino Uno is not designed to run off button cell batteries especially to run both the ...
1
vote
0answers
67 views
Atmega328 NFC cannot wake
I'm trying to communicate my 328 with DFRobot's NFC Module a while now, but I cannot wake the card. Below is my code, where I use DF's instructions on how to make the card work. I write what card ...
0
votes
1answer
186 views
Choosing resistor values for Op-amp and inverting/non-inverting configuration
A LM358AN op-amp is choosen to amplify a AC input signal by a gain of 2.0. The input signal ranges from -1V to +1V and from 0 mA to 16.7 mA. The amplified signal ...
1
vote
1answer
623 views
Internal temperature sensor for the MSP430 - energia
I'm trying to use the internal temperature sensor for the MSP430G2553 with energia (a branch of arduino for the TI MSP430 microcontrollers) but to I'm having trouble calibrating it. The solution I've ...
2
votes
1answer
168 views
Amplifying and Reading a 0-1 V signal into Arduino
I'm trying to read the (0~1V) output of a current transformer (CT) into the 10-bit ADC input of an Arduino Nano. The CT is sensing the L wire carrying 120V at 60Hz.
...
1
vote
1answer
81 views
Power consumption - Energia Launchpad
I'm working with energia for the launchpad 430 and have a rather specific question to make: is example A the equivalent in power consumption has example B, or is it that B drains more power? Thank ...
0
votes
1answer
173 views
LED glows on low port is set to 0?
I have an Arduino UNO board with a ATMEGA328-PU and am trying to control the LED on output 13 that is on the processor pin B5.
I have a switch connected on the Arduino port 7, which is on the ...
0
votes
1answer
75 views
7V or 12V Power Supplies for Arduino
The recommended input voltage for Arduino is 7-12V. Given that both 7V and 12V power supplies (AC-to-DC converters) are available, which voltage will be more suitable/practical? Could be in terms of ...
0
votes
1answer
122 views
Choosing Screw Terminals for connecting Arduino to other components
For connecting a 16 channel relay board to 16 devices running off 24VDC, and for connecting the relay board to Arduino, I am thinking of using screw terminals where one side of the terminals connect ...
1
vote
2answers
305 views
Arduino Pin value gets stuck
I'm using a Python program to send some message over serial port to Arduino. This message contains the pin number of the pin and whether it should be HIGH or ...
0
votes
1answer
101 views
Lighting LED using keypad and microcontroller
So I am working with Gizduino (Arduino clone), keypad and led. What am I doing is getting the value of keypressed and then light up the led according to the value (eg., when I pressed 2 on the keypad ...
1
vote
0answers
294 views
ATTiny85 to power two RGB LED strips
Currently I am trying to control two RGB LED strips with an ATTiny85 microcontroller that I programmed with an Arduino Uno. The program I have basically fades the two LED strips between blue and ...
16
votes
8answers
1k views
How to graduate from Arduino to using a microcontroller directly?
I've been working on an Arduino project. After I get everything working using the Arduino, I would like to move to a solution that does NOT use Arduino. That is, I would like to use a microcontroller ...
0
votes
1answer
83 views
Where to connect RX and TX on my Sainsmart UNO?
I am trying to connect a Bluesmirf Gold on my Sainsmart UNO. I don't know where I should connect the RX and TX on the Sainsmart and I don't have any electronics experience.
On Arduino, that's quite ...
2
votes
1answer
322 views
How to use MOSFETS for single-button on-switch and input signal to microcontroller [duplicate]
I'm trying to create a single button circuit for the purpose of both powering on a microcontroller (probably an arduino) and then allowing the microcrontroller to control its own power (power itself ...
0
votes
1answer
75 views
Programming FabISP Attiny44 with Arduino
Is there a way to program the Attiny44 on a FabISP board using an Arduino board? I read through a few online tutorials, and the ones that even mention using the Arduino as an ISP for an Attiny44 don't ...
1
vote
5answers
585 views
Arduino vs Microprocessor vs Microcontroller
What is the difference between an Arduino, a microprocessor, and a microcontroller? I'm trying to determine what is best to operate a cheap resistive touch screen.
2
votes
1answer
214 views
electronically activated mechanical release mechanism
I’m hacking a toy and would like to fire a spring loaded sponge missile. I’m having trouble googling for some sort of PCB mounted mechanical latch. Or any type of tiny mechanical mechanism that I ...
2
votes
2answers
127 views
Filter 5v pulse from micro input
I am monitoring an external system which sends out a 5v pulse every 2 seconds when in normal mode. When the motor is working, it sends out a constant 5v designed to power a flashing light or LEDs as a ...
0
votes
2answers
84 views
Not recognizing the port [closed]
So I have a gizDuino ATMEGA 644(an arduino clone), yesterday it is working very well and even uploaded some codes into it. But today my computer suddenly don't recognize the port where my ...
2
votes
2answers
338 views
Using an Arduino to Emulate a CD4021 Shift Register for Controlling an NES [duplicate]
This is probably a silly thing to do when I could wait for my CD4021s (74HC165Ns) to arrive and save myself the hassle but I feel as though this can be done and I'm simply missing something. I've ...
0
votes
1answer
665 views
Using Arduino to program at89s51
I want to program at89s52, and on the internet there are many tutorials on how it is usually done, but almost all of them use the RS232 output from the computer, which I don't have.
The only resource ...
2
votes
3answers
267 views
Parallel LCD screen to serial? (1 dedicated microcontroller?)
I'm a newb with electronics and was wondering if there's an IC or PCB that could convert a parallel LCD connection to Serial so I can use 2 wires to communicate with the screen using an arduino and ...
0
votes
2answers
169 views
gizDuino(arduino clone) doesn't power up with 7.4v battery
So i am using an arduino clone gizDuino. Im connecting it to a lcd module. I successfully connected all the pins in the diagram, but when I connect it to the microcontroller the backlight doesnt power ...
0
votes
2answers
155 views
Deleting Single character in LCD
While I have successfully cleared all the lcd display with the help of some guys here by a cheat code (because it doesnt really delete the display)...
1
vote
3answers
299 views
1
vote
1answer
873 views
Playing sounds using WTV020SD mini
I'm a beginner when it comes to electronics. So I want to play sounds using my controller and I am using a WT020-SD-16P
I connected the module to my microcrontroller like in the picture. and added ...
0
votes
1answer
266 views
Simple calculator problem [closed]
So I am trying to create a calculator program in arduino using this codes.
...
1
vote
1answer
161 views
how do I connect a BN59-01006A samsung rc to an Arduino Uno IR receiver module
I have this remote control (BN59-01006A):
and this IR receiver brick(Keyes IR receiver):
I managed to connect the IR brick to my Arduino Uno. I downloaded this library and used a basic Arduino ...
