Tagged Questions

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0
votes
1answer
30 views

Emf interference on arduino and breadboard , using 74HC595 shift register, how to prevent it?

I’m using a 74HC595 chip (shift register) NPX semiconductors, connected to and arduino board. Basically the shift register switches on and off 8 leds in sequence. Everything seem to be working, code ...
-1
votes
3answers
31 views

Making my own kotatsu

I want to make my own kotatsu (a small table with an heating element underneath) and I'm considering using a "heat lamp" as the heat source (one of those aimed at reptiles, fits in a normal light bulb ...
0
votes
1answer
35 views

Changed Op-amp, now signal is not centered

I'm making a pre-amplifier for my 9mm electret microphone to be read by an Arduino. Here's the schematic: Note that the resistor I used connected to the output is 1Meg. My supply voltage is 5V. ...
0
votes
1answer
43 views

Arduino in Ground-Chassis (Vehicle): Activate by grounding

I am working with an Arduino as a controller for an Aftermarket Heated Seats Kit and interface for the stock A/C Auto Control Panel (the car did not come with heated seats, and I acquired an A/C Panel ...
0
votes
1answer
40 views

Schematic & pin reduction

I am using arduino Uno for developing my project. There are totally 24 analog hall sensor out put,1 temprature ananlog output, 1 Rshunt voltgae measurement. There are totally 26 Analog sensor.I am ...
1
vote
0answers
19 views

Single wire CAN // Saab 9-3 I-Bus // GMLAN

I'm trying to control an instrument cluster from a 2008 Saab 9-3. It has 2 pins marked for I-Bus (both wires are green, continuity test shows they are tied together as shown here: Some sites also ...
1
vote
1answer
48 views

1-Wire Serial communication to standard RX/TX Serial ports in microcontrollers

I just want to start by saying that I'm relatively new to electrical engineering in general, so if I sound absolutely retarded please bear with me. As part of a learning project I'm working with a ...
5
votes
5answers
708 views

Safety of using microcontrollers such as Arduino

I have been learning how to work with Arduino Uno R3, and it seems very intuitive and exciting for me. As many agree, I see lots of benefits of learning to use it at a young age. I would like to ...
0
votes
0answers
41 views

Non line-of-sight distance sensor

I am working on a project and need help with one of the systems. I have a car (4 feet by 5 feet) that starts off at a docking station and without user input moves around a driveway. One of my ...
1
vote
0answers
132 views

How do I transfer more than 1 byte at once via SPI bus? [migrated]

I have an AD5685R DAC that I am trying to communicate with over SPI. Per the datasheet, ...These [24] bits are transferred to the input register on the 24 falling edges of ...
0
votes
1answer
63 views

Arduino-like with fast ADC/DAC [on hold]

I am building a tester to measure the pulse response of certain equipment. The requirement is to apply a pulse in the low us range, measure the response, apply the next pulse etc. I have a setup using ...
0
votes
0answers
4 views

How to connect Arduino Pro Mini with PC? [migrated]

I'm about to buy Arduino Pro Mini (http://arduino.cc/en/Main/ArduinoBoardProMini). As far as I can see it requires FTDI or similar circuit to program it. Should FTDI be present for communication with ...
4
votes
2answers
739 views

How does a ps2 mouse send data to a computer? [on hold]

I want to read data from a mouse with the help of Arduino. I want to calculate relative motion between two objects. My questions are 1) Is it possible? 2) How is mouse interfaced with Arduino?
0
votes
1answer
37 views

Mosfet IRF7457PbF voltage drop too high

I'm using a mosfet for powering an Arduino mega 2560 on and off. The current drawn is less than 500mA with a 12V battery. I chose the IRF7457Pbs (RS 543-0888), with these features: VDSS - 20V RDS(on) ...
1
vote
2answers
53 views

Using LM2575 switching regulator

The LM2575 is a step-down voltage regulator. I want use it to step down from 9V to 5V in order to power my Arduino board and Bluetooth module. However, I'm not sure how to wire this into my ...
1
vote
5answers
161 views

Does the color of Jumper cables matter?

Does the color of jumper cables in a circuit matter? I'm starting out with Arduino and can't get it to work at all with a breadboard! I'm thinking it's something simple like this! I know Black is ...
1
vote
2answers
77 views

Number of bytes and file size(HEX)

I am confused regarding the (size/number of bytes) in a hex file. Taking the case of A sample Blink Arduino Program - Blink.cpp.hex On linux terminal, size command output: ...
0
votes
0answers
34 views

Getting to work RFID-RC522 reader / writer with Teensy 3.1

I am trying to use the RFID-RC522 reader / writer together with a Teensy 3.1. I cannot get it to work. I always get the error: MFRC522 Software Version: 0x0 (unknown) WARNING: Communication ...
0
votes
1answer
44 views

Jack type for a 12v DC motor

I have an Arduino with a motor shield and I use it to power 4 different DC motors. Motors are connected to the shield through a screw terminal. Since I am in the prototyping step, I am moving them ...
0
votes
1answer
70 views

Arduino standalone with 9V battery and accelerometer

I'm using an Arduino Mega for a project involving an accelerometer. Everything works fine when the board is connected via USB. When I use a 9V battery plugged in with the 2.1mm jack, values are ...
0
votes
0answers
17 views

How to Segment Accelerometer Signal at idle points

I'm using an 3 axis Accelerometer(GY-521) to get the acceleration data and also the gyroscope to get the gyro data. I want to segment the signals at the idle points so that i can get the segmented ...
0
votes
0answers
26 views

Using 3 Channel Video Switcher Module with Arduino

Hey all I am wondering how to go about switch from camera 1, 2 or 3 using this 3 Channel Video Switcher Module on ebay here. Since there's only V+, V- and signal for the "switch" it looks to take a ...
0
votes
0answers
45 views

Arduino Output to 24V logic

We are testing out some analog sensors, and we need to send a 24V trigger (maximum 15mA) to a PLC from an arduino. I have seen some designs using a MOSFET to make a bidirectional logic converter, but ...
1
vote
0answers
18 views

Altera DE2 compatible sensors

I'm a beginner in the world of digital systems, I want to connect an ultrasonic range finder sensor to my Altera DE2 Board, and this sensor is Arduino and pic microcontroller compatible , can I ...
0
votes
0answers
12 views

Hide Line Feed Values in Arduino/Android communication [closed]

I have created a client android application that sends ASCII character to a server hosted on arduino wirelessly. My Arduino server reads in these values and Display's ASCII values in the serial ...
1
vote
2answers
94 views

Controlling a 12v potentiometer with Arduino

I want to use an Arduino to control a motor I pulled from a treadmill. The treadmill came with an MC-60 controller. The treadmill used a potentiometer to control the motor speed. Here's a portion of a ...
1
vote
0answers
30 views

Arduino Serial buffer [migrated]

I am trying to write one code that takes data from serial ie. 0x4E, 0x20, 0x--, ...
0
votes
1answer
79 views

Choosing N-channel MOSFET for 12V output

I'm looking for an alternative to the STP16NF06L MOSFET N-Ch 60 Volt 16 Amp as Radioshack does not carry it. The MOSFET is meant to take a 5V PWM signal from the Arduino to drive a 12V LED strip. ...
0
votes
2answers
101 views

Embedded system for image processing project

Is it possible to do image processing (to extract numbers and text) using a microcontroller? If not, what are the alternatives to do this task?
0
votes
0answers
51 views

DS1307 not counting

I've got a TinyRTC board with a DS1307 on it connected to an Arduino. Setting the time and reading is no problem (using the DS1037 Arduino lib). Weird thing though is that when I disconnect the power ...
0
votes
2answers
56 views

arduino based pic16F877A programmer

is it possible to program PIC 16F877A using arduino uno? if it is possible, please tell me how to this;
0
votes
0answers
49 views

Connecting GSM SIM900A module with Ardunio

I have bought an SIM900A Mini V4 GSM module. Here is the module, I want to configure with arduino to send and receive SMS. Do I have to connect TXD of this module--Tx of Arduino & RXD of this ...
0
votes
0answers
41 views

pin connection added

I am trying to communicate 24 hall sensor via arduino & 8:1 Mux . I am using CD74HCt4051E 8:1 multiplexer. Instead of hall sensor i have used potentiometer 24 nos and connected to MUX IC devide ...
0
votes
1answer
46 views

Arduino not driving RGB LED Strip

I'm using Arduino Uno with a 12V RGB Signal Amplifier and a 12V RGB LED strip. 12VDC is supplied to the amplifier. However the LED strips does not light up whether the PWN pins are set to either ...
0
votes
0answers
20 views

Can the Arduino use this i2c LCD Panel [migrated]

Can the Arduino Mega2560 use the New Haven NHD-0420D3Z-NSW-BBW-V3 LCD panel by controlling it with the New LiquidCrystal library? What cable will you use to connect the LCD to Arduino, are there screw ...
0
votes
1answer
89 views

Why does the GND of the Arduino oscillating as well?

I have an Arduino Uno and what it does is simply output an oscillating signal of 1 MHz on PIN11. I measured the signal using a oscilloscope and a probe with a ground clip. First, I connected the probe ...
0
votes
0answers
54 views

7 segment LCD replacement

I have a Honda Goldwing motor cycle the LCD showing time & radio channels has failed, the LCD is no longer available. It uses 7 segment technology, is there anyway to convert the 7 segment data ...
0
votes
0answers
11 views

Have Arduino write data to a MySQL database? [migrated]

Would it be possible to have an Arduino write directly to a MySQL database? I'm a web programmer, so I'm familiar with how to get records from a MySQL database. I have MAMP installed on my mac, so I ...
0
votes
1answer
38 views

Connecting multiple servos for a robotic arm

i am computer programmer and its really been long since i have done electronics. I need help on connecting my servos to an arduino to power my robotic arm. This is the robotic arm that i am trying to ...
0
votes
0answers
55 views

PNP and NPN transistor used with ARDUINO how to connect them?

This my circuit. What it does is: measuring pressure with MPX200A sensor and looks if pressure under 3 bar, switches on part 1 on arduino (2 transistors) to run DC motor clockwise. If pressure above ...
0
votes
2answers
31 views

Equivalent of STP16C596 in DIP package for through-mount [closed]

I’m trying to add a large number of RGB LEDs (70, so 210 outputs) in a fairly small space (basically a keyboard, although it’s a bit bigger than most). I read on this tutorial and elsewhere about ...
1
vote
1answer
67 views

ATMEGA328P SPI MMC/SDIO

I want to connect an ATMEGA328P to a mobile phone, a Samsung Galaxy S3 to interface some data. I need to use the microSD port behind the battery cover for this purpose, so here is the question, Is it ...
0
votes
0answers
66 views

4x4x4 LED cube using 74hc595 shift registers

I am currently planning on building a 4x4x4 LED cube. It will be organised as 4 layers of 4x4 matrices where the cathode of each 16 LEDs are soldered together. The anode of each of the 16 LEDs are ...
1
vote
1answer
60 views

SMBus using Silicon Labs C8051F560

I am trying to communicate an arduino with a Silabs F560 Toolstick Daughter Card. On Arduino (Master) I have loaded the i2c scanner program from http://playground.arduino.cc/Main/I2cScanner which ...
1
vote
2answers
59 views

Can I program 5V ATmega328P using 3.3V ICSP bus?

I am considering building a microcontroller HAT for Raspberry Pi Model B+. Since the Pi have the SPI bus exposed and some avrdude fork supports using it directly, I ...
0
votes
3answers
129 views

Using a P-channel MOSFET as an on/off switch

The project I want to build is shown below. I want to operate the P-channel mosfet on and off with variable frequency from 20-100Hz and I choose P-channel to do this so that the +350V will not be ...
0
votes
2answers
101 views

How to tell when the stepper motor is done stepping?

I am working on a project that requires mildly accurate positioning of the x and y axis. It involves an airsoft gun and it is basically a motion tracking turret. Because of the requirements for ...
2
votes
2answers
70 views

How to Check Rechargeable Battery NiMH Status with Microcontroller?

I created a device, based on an Arduino Uno, which runs on 6 rechargeable NiMH batteries. Now I would like to add a check, if the batteries have enough power left, to warn with a signal when the ...
0
votes
1answer
51 views

PIN selecting problem over arduino

My schematic as below. I have connected 8 hall sensor as shown in picture. Problem i am facing here is SO, s1, s2 The Led light are not glowing .Even the forard voltage across is 3.9v. i have tested ...
0
votes
2answers
57 views

Miniaturizing home automation help? [Novice]

Right now I am doing a home automation project and I want to create two things. The first is a device that looks like this but has the capability to also be controlled over wifi using Arduino. I know ...