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
60 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 ...
1
vote
2answers
97 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 ...
0
votes
1answer
34 views

ACER 522 FOXCON motherboard schematic (where to find?) [closed]

my University has given me a oscilloscope and I had an old ACER 522 sitting around, so I decided to dismantle it and do experiments on it as if it were a beaglebone or rasberry pi. The only problem is ...
0
votes
1answer
53 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 ...
-1
votes
0answers
23 views

What's a good RFID solution for SoCs like RaspberryPi or BeagleBoard? [closed]

I'm looking for a cheap, preferably OSHW RFID interrogator (and compatible tags) that will "work" with an SoC such as RPi Model B or BeagleBoard. The idea is that I could write my own middleware and ...
-1
votes
0answers
8 views

rasberry pi two devices GPIO [migrated]

I want to use both a the PiTFT monitor (http://www.adafruit.com/products/1601) & Woldsfson Audio (http://www.element14.com/community/community/raspberry-pi/raspberry-pi-accessories/wolfson_pi) ...
0
votes
1answer
64 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 ...
0
votes
0answers
37 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 ...
0
votes
2answers
25 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?
0
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0answers
13 views

WiringPi vs default Raspbian RPi.GPIO module [migrated]

Can anyone explain the difference between WiringPi and the default RPi.GPIO module that comes with raspbian? What extra features does WiringPi have?
0
votes
1answer
33 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
47 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
vote
2answers
174 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
26 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 ...
-1
votes
0answers
65 views

Maximum Ohms for IR LED and transistor

I bought a cheap IR extender and I'm trying to use the small sticky cases to control my TV using a Raspberry Pi. The extender has two "heads" with a small IR LED in it and they were connected to the ...
2
votes
2answers
159 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
60 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
221 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
119 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
60 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. ...
-1
votes
0answers
19 views

Raspberry Pi Compute Module schematics [migrated]

I want to create a massive electrical switchboard PCB (24x 230V relays) with individual current and voltage monitoring using a RPi Compute Module as controller and the GPIO banks for controlling. ...
2
votes
1answer
39 views

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

As some of you know - Raspberry Pi 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: Raspberry Pi ...
0
votes
1answer
19 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, ...
1
vote
1answer
79 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
104 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
78 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
56 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
85 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
86 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
votes
3answers
73 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 ...
0
votes
0answers
35 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
votes
0answers
41 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
votes
1answer
138 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
23 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 ...
2
votes
2answers
167 views

Creating an opto isolator board for Raspberry Pi

I have a relay board which I bought from dx.com and I am not sure about its reliability. If it fails, then it may harm my Pi right? So I googled around and read that opto isolator provide complete ...
1
vote
1answer
91 views

Connect VLF antenna to raspberryPi

I want to connect two VLF antenna (given below) to a RaspberryPi using it's GPIO ports with a MPC3008 ADC. Desired frequency range is between 3kHz to 30kHz, and MPC3008 supports 200,000 samples/sec ...
0
votes
2answers
116 views

Question regarding PCB design layout of Raspberry Pi

I have query regarding PCB design layout of Raspberry Pi (RPI). I wanted to know how LAN9512 chip is connected to Ethernet RJ45. I found one of PCB layout picture which suggests there is line on PCB ...
1
vote
1answer
107 views

UART connection

I want to implement an UART port, just like the raspberry, but I have seen other connections that include more pins (like the picture below) In some cases, only TXD, RXD, CTS, RTS, GND are ...
0
votes
1answer
133 views

How to power Raspberry Pi with a Flight Controller

I am making an autonomous quadcopter and I need Raspberry Pi on board to implement image processing. The issue is that I have a 4in1 ESC which comes with only one UBEC to power the flight controller, ...
3
votes
1answer
64 views

How to read SAA1064 7-segment values

I have a central heating system that displays it's info and error codes on 4 7-segment displays. These displays are driven by a SAA1064, like so: This SAA1064 (datasheet here) receives it's ...
0
votes
1answer
117 views

Raspberry Pi SPI interface with PIC-16f877A

My project is to receive sensor data at I2C of PIC and transfer it to Raspberry Pi via SPI. How can I interface my PIC and Raspberry Pi so that PIC starts receiving data as per command (SPI ...
2
votes
1answer
67 views

DS18B20 with MOSFET - reading temperature from multiple sensors on Raspberry Pi

I am attempting to read temperature data from 10 DS18B20 sensors, not connected in parasite mode. It happens quite often that I don't get a reading from a sensor. I read online a bit about MOSFET's ...
1
vote
0answers
38 views

Need circuit to power string of LEDs via TV USB port and separate psu [closed]

I built a ambilight clone with a raspberry pi and a string of ws2801 LEDs. The LEDs are powered by a 5v 2a power supply. I would like to build a circuit that detects the 5v coming from the TVs USB ...
4
votes
2answers
118 views

How to create a touch switch to use with a Raspberry Pi

I'm trying to make my own wakeup lamp. I have a lamp with a large metal base to hide all the components in. I also have a Velleman K8064 DC Controlled Dimmer Kit which I have put together and is ...
1
vote
1answer
61 views

Need specifications to operate this stepper motor with RPi or Arduino

Here is the disassembled stepper motor that I'm working with: I need to identify this stepper motor that was retrieved from scrap for a project. Budget constraints force us to use the scrap ...
2
votes
1answer
148 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 ...
3
votes
2answers
355 views

Control 12 solenoids with a raspberry pi

I'm a musician and I'm working on a funny project : control solenoids with a midi keyboard. So I have a MIDI keyboard connected to my raspberry pi connected to my breadboard. Until now everything is ...
6
votes
7answers
1k views

Sending I2C reliabily over Cat5 cables

I am considering implmenting an home automation system around my Raspberry Pi but I found the price and space requirement of inserting a Pi every place some control is required too much but the Cat5e ...
1
vote
1answer
165 views

ATX-PSU to supply PC and RaspberryPi

I want to integrate a RaspberryPi into the case of my desktop PC, that has an ATX-PSU. I want the RaspberryPi to keep running, even if the PC is shut down. It would be nice to avoid the additional ...
2
votes
3answers
241 views

Ground loop when measuring in process pH

I have been experiencing a very difficult to solve ground loop problem with my pH measuring system. My basic setup is a standard pH electrode running through an op-amp to an ADC which communicates ...