The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. It’s a capable little PC which can be used for many of the things that your desktop PC does, like spreadsheets, word-processing and games. It also plays high-definition video. The design is based around a ...

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1answer
36 views

driving LEDs via a PI a attiny and TLC5940 (validation) and possible powering issues

at the moment I am planning my first real (big) electronics project. I want to build a LED lamp, that can be controlled by a RaspberryPi (for e.g. programming a binary clock or changing the brightness ...
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3answers
124 views

Rate my Rasberry Pi UPS

I've made simple schematic for a UPS for Raspberry Pi. It contains a 12V Lead Acid Battery (40Ah), 5V LM7805 regulator and some capacitors. I'm supposing max 1.2A load from Raspi. Should I add ...
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1answer
65 views

Building a wifi controlled switch [on hold]

What I want to achive :: I basically want to control all the lights and fans in my dorm room using my smartphone My plan :: Send wifi signals using my smartphone . Using a receiver and processor to ...
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0answers
39 views

DIY wireless image or video transfer [closed]

I would like to start a DIY project for wirelessly transmitting a image or video to my raspberry pi. To start with i would like to take image using cheap camera module with I2C or some other interface ...
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2answers
48 views

Connect an ATmega328 to a Raspberry Pi

I've been stuck on this problem for a couple of months now and haven't had much luck finding the exact information that I need. So, I'm currently working on a project to make a handheld raspberry pi, ...
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1answer
20 views

Raspberry Pi High Voltage Supply Soft Off Circuit

After looking at various designs for a "software" controllable power off circuit for a raspberry Pi computer I decided none of them fit my need so I designed my own. Before I commit it to a PCB for ...
1
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1answer
75 views

24V to 5V DC conversion for Raspberry Pi

I'm trying to power several devices off of a breadboard. For simplicity I want to power these all from the same PSU. The highest voltage amongst the devices is 24V. I was looking to use a 24V 2A ...
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votes
2answers
58 views

Is it possible to power an Arduino Uno with a Raspberry Pi?

I have an Arduino Uno and a Raspberry Pi that I'm using to control some LEDs in a computer case. Power is coming from a Molex connector from the computer's PSU. I want to place the Arduino and the Pi ...
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2answers
189 views

Can I run matlab on a microcontroller?? and if yes which one?

I am working on a complicated robotics project which involves MATLAB image processing algorithm and LEGO MINDSTORMS interface as well as an Arduino. The system works dependently in a sequence ...
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2answers
60 views

Faster quadrature decoder loops with Python code

I'm working with a BeagleBone Black and using Adafruit's IO Python library. Wrote a simple quadrature decoding function and it works perfectly fine when the motor runs at about 1800 RPM. But when the ...
0
votes
1answer
43 views

Solar power monitoring with Raspberry Pi

I want to measure the current and voltage from a set of small solar panels (about 10V and 100mA but not settled yet) using a Raspberry Pi. There will be between 4 and 6 panels. This project will ...
1
vote
2answers
92 views

Raspberry Pi + Microcontroller for commuting audio input and output (audio matrix switch) [closed]

I am new in electronics and I'm working on a personal project with Raspberry Pi that I need help. I want to make a board that allows to commute 4 audio inputs (TV, MP3, DVD, FM web) in 4 audio ...
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2answers
76 views

Interfacing incompletely documented logic signal where resistor affects output voltage level

So I've got this marginally documented 12V logic signal from something I have to regard as a black box that I'd like to interface to a pi or arduino (i.e. c 3V). I have 3 lines - 0V, +12V and signal ...
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votes
0answers
46 views

Connecting a garage door opener remote directly to Raspberry Pi [migrated]

I am a newbie. I am going to try and make my first Raspberry Pi project. I have the Model B revision 2.0 board and want to connect a spare garage door opener remote. I have an option of using a relay ...
0
votes
0answers
54 views

Can I use Cat5e cable to carry 12V and signal for Raspberry Pi project?

I'm doing a "home automation" project with a RPi at the center. It's to do various things including a) controlling lights using PIRs, and b) automating a motorised blind. The blind is opened / closed ...
1
vote
1answer
112 views

Raspberry Pi stereo camera frame synchronization/genlock (video or still image)

I need to frame synchronize a stereo camera for a computer vision application. The synchronization should the best possible, hopefully on a millisecond level. I would like to get about 10 FPS either ...
1
vote
1answer
57 views

Beam sensor or other switch needed for electric blind project

I am designing a motorised blind (powered by a Raspberry Pi) and need a reliable way of detecting when the blind is fully "up" or "down". I don't want to use a stepper motor, and rely on counts, as I ...
0
votes
1answer
45 views

Powering Raspberry-pi using ESC

Currently I am building a quadcopter with Raspberry Pi and I have four 20A Tunigy Electronic Speed Controller (ESC). I was wondering about could I use ESC's red wire to power my Raspberry-Pi? (tying 4 ...
0
votes
2answers
71 views

How do I active the relays on this relay bank?

I purchased 2 "Mechanical Relay Board, 8 gang, 10A 220VAC, 24VAC 30ma coil" relay banks that I am trying to control from a raspberry Pi. To do this I've built out 2 595 shift registers and I'm using ...
0
votes
1answer
75 views

Seperate device vs software solution

My apologies, I'm not really sure how to phrase this question. I'm a little confused about what is the advantage of having a separate circuit controlling a module vs connecting the module directly to ...
0
votes
1answer
92 views

Failsafe for home automation with Raspberry Pi

I have a Raspberry Pi driving a home automation system. I have connected a bunch of lights to the network. The GPIOs of the Pi connect to a relay board that switch the lights on and off. What I need ...
0
votes
0answers
74 views

Controlling solenoid valve using Raspberry Pi

I'll start by saying I'm a CS student with almost zero knowledge in electronics. I want to build an irrigation system which is controlled by a Raspberry Pi (with fancy wi-fi features), and uses a ...
0
votes
1answer
152 views

Arduino: What is the best way to send and receive data with I2C?

I am using I2C to send and receive int values from a RaspberryPi to an Arduino then echoed back to the Pi. The primary problem I am having is with int values larger than 255. A secondary problem is ...
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2answers
110 views

How can I seamlessly switch power supplies?

Quick question, I am not very good with my electrical circuit terminology so I'm not sure what to call what I'm trying to do. When I try to Google "How to switch power supplies" I got inundated with ...
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votes
1answer
71 views

Controlling a bank of relays

I have a project that requires me to control a set of relays (up-to 24 of them). The current setup is using Wago Speedway 767 field-bus modules. I'm just ramping up so I have to either figure out how ...
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1answer
157 views

Potential project: Wireless Security Camera with the Arduino Yun

I have been following Arduino and Raspberry Pi projects closely for a while and I am pretty keen on giving one a go. I have no real electronics assembly experience but can program. I have chosen the ...
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0answers
47 views

Spurious interrupts using switches on a Raspberry Pi

I have two switches connected to GPIO pins on a raspberry pi. One side of each switch is wired to +3.3v. The other side is connected to an input pin via a 330 Ohm resistor, and each input pin has a ...
1
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2answers
46 views

Connecting RaspberryPi & Leonardo-voltage divider needed?

According to this article when connecting a RPi to a Uno a voltage divider is needed because of the voltage difference. Does the same apply to a RPi and Leonardo?
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1answer
35 views

Connecting RaspberryPi to leonardo

Can any RaspberryPi-Arduino experts tell me what are the best options of sending data from the RPi to a Leonardo given the following 1- running raspbian on the RPi 2- running a Python script on ...
0
votes
1answer
53 views

Avoding repeated queries while working in a WSN set-up of Coordinator-->Repeater-->End Device , when Coordinator and End device are in Range

I am working on a WSN set-up. I posted a question earlier on the same. I had a another question with respect to the same. My question is while working in broadcast mode, if Coordinator and end ...
1
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2answers
184 views

Transistor Ohms

I've built the circuit in the schematic below to control my TV, the D1 and D2 LEDs are the two mini LEDs from this IR Extender: I've cut it below the female headphone jack and I'm using my ...
0
votes
1answer
56 views

Coordinator + Repeater Xbee + End device configuration

I am trying to work on a Xbee based solution for transferring data from with in a specified area.I am using Xbee865LP for the same project. Now what i want to implement is Make one device act as ...
2
votes
2answers
190 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 ...
2
votes
2answers
90 views

Using the raspberry pi to measure multiple electrical circuits

I am looking to use the raspberry pi to measure the power consumption of multiple household electronics and record the information to analyze later on. However, I'm not sure if it's possible to ...
3
votes
2answers
252 views

Can I use 74HC14 or NPN transistor instead of MOSFET as level shifter

I have SN74HC14 or BC548 / 2N2222 transistors. I need level shifter for I2C between arduino and RPi. Here's simple circuit from the internet Problem is I don't have any MOSFETs. Can I use NPN ...
1
vote
1answer
130 views

Two or more different regulators connected to one battery

I want to make batteries provide power to both a micro controller (Raspberry Pi) and a 4x4 LED matrix. A simple circuit diagram is shown below. (only one LED is drawn in the fig. But regard it as LEDs ...
0
votes
1answer
74 views

Best way to emulate network switching on PCB

I'm interested in wiring up some Raspberry Pi Compute Modules together on a custom PCB board with DDR2 SODIMM connector interfaces. ...
3
votes
2answers
111 views

Raspberry Pi and USB modem - can I connect it like this?

As some of you know - Raspberry Pi model B has only 100mA available on USB ports. I want to connect USB modem (that takes > 500mA sometimes) to my Raspberry without powered USB hub. I have: ...
0
votes
1answer
26 views

Trouble bridging connection between my Pi and my laptop's WiFi

I have been trying to get this working for a while now and still no luck. I have Googled and Googled till my eyes hurt and everything I try won't fix it. I have sharing disabled on both connections, ...
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vote
1answer
94 views

Linear regulator LM1084 5.0V capacitors choice

I'm trying to make power supply for RaspberryPi and another one for usb hub and another for 9 Ping sensors(20mA)+ few servos + few microcontrollers like Atmega328P. I have only LM1084 or LM7805. So my ...
0
votes
2answers
116 views

Can I amplify high frequency signal?

I have found this awesome Raspberry PI FM transmitter project. It uses RPi GPIO pin to simulate FM signal. After some filtering to smoothen it, this could act like a real transmitter. But at this ...
1
vote
2answers
102 views

raspberry pi relay

I'm trying to make the Raspberry Pi controlled relay. Searching the internet the whole day, I still cannot get it to work. ( I did not even connect it to the GPIO yet, just using the 3.3v rail). ...
0
votes
1answer
118 views

Writing to register on I2C device, returns device busy

I am trying to write data to a register on an I2C chip from the Raspberry Pi, when I use i2cdetect I get UU, which I understand is an error. ...
0
votes
1answer
100 views

Two circuits with different voltages - should I use a transistor or an optocoupler as a switch

I am doing a project using the output of a Raspberry Pi GPIO pin (3.3V) to power a 12V remote control. If the two are on different circuits, can I use a transistor to switch on the 12V circuit or do ...
0
votes
2answers
112 views

Can a Raspberry Pi control a servo motor?

Can a Raspberry Pi (RPi) board can control a 10Amp servo motor ? I read on the Internet that a RPi could control small servo motors. If so, is there an add-on board that, when connected to the Pi, ...
0
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3answers
83 views

Identify key in a multiple keys, single lock system

I have a hobby / office project underway. We want to issue a key to multiple users each with a different pin pattern. Upon turning the key we want to identify the key and thus the user. My google fu ...
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0answers
47 views

How to connect SINAMICS V60 driver to RaspberryPi

I have a Siemens motor with SINAMICS V60 driver (10A). Here is the Getting Started Manual (28MB PDF) . I want to connect this driver to the GPIOs of my raspberry Pi board. The purpose is to control ...
0
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0answers
46 views

ADC and Pre-Amp Suggestion for RBpi

I want to receive VLF signals (between 15kHz to 30kHz) with my RBPI. So I can found only this antenna: Miniature Very Low Frequency Antenna ANTM1. This miniature 6 inch long antenna can be ...
0
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1answer
194 views

Programmable Bluetooth transmitter

As I develop my R&D project I decided to add bluetooth to the mix... In the first stage I decided to use my own iMac as a transmitter and my iPhone as the receiver, and it worked great... As I ...
0
votes
0answers
26 views

Using Arduino ADK as a USB to TTL converter?

I know this can be done with the UNO, but does anyone know if it would be possible to use my Arduino ADK as a USB to TTL converter, then use that to program my Raspberry Pi instead of using a regular ...