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
15 views

Circuit Check Please

So im Building a project these leds will be arranged in a circle there will also be about 15 more of these. with inputs to activate them the 3.3 volts will be from a raspberry pi gpio pin. The 12v ...
-1
votes
1answer
30 views

How can I interface with RPi-Camera to FPGA?

I want to interface with RPi-Camera to my FPGA bord. As you can see, http://www.wvshare.com/product/RPi-Camera-B.htm This camera has a 15pin-ffc cable. But I can't get a ffc cable's interface ...
0
votes
0answers
23 views

H-Bridge Motor Stuttering

I've built a little 2-wheel robot connected to a Raspberry Pi and I'm attempting to drive it using a SN754410NE H-Bridge. It's plugged into a 9V/650mA power plug. When I run either motor on its own ...
0
votes
2answers
48 views

Raspberry Pi 2 vs STM32f429I Discovery?

I couldn't really figure out this issue. Raspberry Pi 2 has 1GB of RAM, 900 Mhz Quad Core ARM Cortex-A7 processor and so on. On the other side we have Cortex-4 processor 256Kb RAM. Other peripherals ...
0
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0answers
21 views

Finding the audio frequency using a Raspberry Pi and a Piezo sensor

I am trying to use a piezo sensor to determine the audio frequency of a guitar and displaying the result on a monitor via a raspberry pi but want to make sure it's possible before I try. Using the ...
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0answers
39 views

On/Off things wireless and cheap [on hold]

I am not sure if this is the right section, but first let me tell you that I have almost no knowledge of electric circuits. What I want to do is to have in different part of the house something that ...
-1
votes
0answers
33 views

ESP2866 Style controller but 5GHz [on hold]

So I'm looking into using the ESP2866 for some projects but I noticed it operated in 2.4GHz. Is there a cheap alternative that supports 5GHz?
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0answers
49 views

Raspberry Pi GPIO pin layout + Cooking Hacks Shield [migrated]

I am studying the schematic diagram of the Raspberry Pi to Arduino shield from cooking hacks and I noticed that there is an inconsistency in the labeling of the pins. So, this gives me two questions. ...
0
votes
2answers
70 views

Out-of-band communication between two PCs

I'm working on a little project. In the project, data must be sent from a PC to another device. Initially, I used a Raspberry Pi and life was good. I could communicate Python between the RPi and the ...
0
votes
1answer
53 views

Powering multiple devices from a single supply with 48V

First of all I asked this question in DIY.stackexchange.com, because of the cabling in the house. Here I would like to ask about the electronics (or electrical) part of it. And there is a very ...
-4
votes
2answers
96 views

I have a LED problem, please check image [closed]

I have a problem getting a signal out of a LED circuit, I have written the problem in the image.
-1
votes
1answer
39 views

Opto-Coupler that will switch on a 230 volt appliance plugged into the mains [closed]

I am making a little project on my raspberry pi that will act as a simple thermostat, I have managed to work out I need an Opto-coupler but I am not sure it will be able to cope with thr UK's 240 volt ...
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votes
0answers
36 views

How to (cheaply) generate a low voltage DC analog signal (+/- 14 to 70 mV). 1 mA/cm2

I am looking to generate a low voltage DC analog signal (+/- 14 to 70 mV). I was also looking to incorporate frequency modulation (voltage controlled oscillator?). Would I be able to achieve this ...
0
votes
2answers
61 views

From a 3.3v Pin do we separate Positive and Negative flow? If so, how?

If we do not separate Positive and Negative flow, what is the flow from a 3.3V connection? A Little more background on why I ask this question and my confusion follows I have been reading simple ...
1
vote
1answer
43 views

Calculating resistor values for RPi circuit detecting AC current using H11AA1 and PNP transistor

I've got an electronic doorbell system (Aiphone IE-1AD) that sends a ~15Vac signal when the button is pushed. I used this blog post on detecting a signal on a similar door bell using a moteino ...
-1
votes
0answers
50 views

Will this work on a touchscreen? [migrated]

I am trying to make a portable games console using the raspberry pi and i've came across a nintendo ds emulator. I'm trying to find a touchscreen for it but I can't find an accurate one. I found this ...
0
votes
2answers
74 views

Create a rolling code garage door opener [closed]

I've been tinkering with my Raspberry Pi lately and I've been looking at opening garage doors. A majority of garage doors have the ability to "learn" a new remote. Is it possible to program a Pi with ...
0
votes
1answer
97 views

How to modify USB battery pack to function like a UPS?

I bought this USB battery hoping to use it as a uninterruptible power supply for a Raspberry Pi 2. I researched it, and users said it could be charged while also powering devices...just what a UPS ...
1
vote
0answers
45 views

Connecting encoders/SPI devices/LEDs/buttons to a Rasperry Pi

I'm trying to connect a model B rev 2 Raspberry Pi to a whole bunch of stuff to create a MIDI foot controller: Adafruit touch screen 20 switches (some foot, some encoder buttons) 8 x SPI LED drivers ...
1
vote
2answers
56 views

Send signal to gpio when 8V power drops

I want to be able to detect when a 8V signal goes low and send a signal to a raspberry pi over GPIO. A java app will be listening on the GPIO pins for any changes. I would check if the voltage drops ...
0
votes
1answer
23 views

Raspi Audio Problems When Using a Servo

So I am trying to make a raspberry pi control a servo but it also needs to have speakers attached. But whenever the servo is powered there is a horrible audio output through the speakers. This will ...
1
vote
1answer
136 views

Will this schematic work?

Newbie here, trying to learn electronics (Iam from SW background). Looking for someone to review the initial schematic and advise. Haven't ordered the parts yet, so appreciate any tips in finalising ...
1
vote
2answers
267 views

Sharing GND with a device

I've built a watchdog circuit for my Raspberry Pi using a NE555. In the astable configuration I'm counting ~5 minutes and then I kill the switch unless there is a signal from GPIO that discharges the ...
0
votes
1answer
97 views

How to modify existing circuit to additionally control it from outside by raspberry?

I found a great circuit for light home automation: circuitdb.com, but I would like it to be more than a momentary light switch bricked up in the wall.I would like to control it by raspberry or ...
0
votes
1answer
46 views

Replacing SD card reader on a Raspberry Pi B+

I recently purchased a Raspberry Pi B+. However, the micro SD Card reader had a defective spring loading mechanism, so the card would not lock in place (a new Pi is now on the way!) However, I would ...
1
vote
1answer
83 views

Raspberry Pi Intercom, switch using transistor or relay?

I am researching a way of using a Raspberry Pi to act as an Intercom. I already have the intercom system mounted, but it's a very old one and wanna do something to it to be more new technology ...
0
votes
2answers
57 views

How to use a Raspberry Pi Pin(3.3V) to reset a ATMEGA328(5V)

I have a ATMEGA328(AVR) connected to a Raspberry Pi(RPI) via serial using a level shifter. The AVR has the Arduino Bootloader installed and I would like to program it via serial. What would be the ...
0
votes
1answer
82 views

Help, How do I interface this screen with an arduino?

I have a very small LCD screen for my Arduino, it has a ribbon cable on it and I do not know how to connect it with an Arduino, it has a small piece of paper on it and that reads " OS096016PP08MB2B10 ...
3
votes
1answer
49 views

How to replace a SMD capacitor on a raspberry pi?

(Note: also posted first in raspberrypi stackexchange, but not a single answer yet) While desoldering the GPIO, I accidentally broke the capacitor C13 of my raspberry pi model B (2011.12 Rev7). It ...
1
vote
0answers
76 views

USB battery charger and GPIO power supply schematic for Raspberry Pi

I'm trying to design a circuit in Eagle to provide reliable + safe battery power to a Raspberry Pi via the GPIO pins. The requirements are: Accept power input via micro USB (separate from the Pi). ...
0
votes
0answers
37 views

LCD Flickering when Shielding is not Connected to Ground

I got myself one of these LC-Displays: http://www.sainsmart.com/sainsmart-hdmi-vga-digital-9-9-inch-1024x600-lcd-driver-board-for-raspberry-pi.html It's a barebone LCD setup with just the components ...
0
votes
1answer
87 views

How to restrain this soft latching power switch from eating too much current?

I am designing a two buttons soft latching power switch for a project involving a raspberry pi, li-ion cells I salvaged from the battery of a broken laptop, and a power booster from adafruit. I ...
0
votes
1answer
71 views

MOSFET Switching without gate voltage / LED Strip

I have ordered logic-level MOSFETS of the type IRLZ34N (for the sake of working on a Raspberry Pi) but I have problems in Wiring it up. I have so far connected: +12 to the +12v lane of the switch ...
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votes
4answers
84 views

Can two LED circuits with a shared ground use a single resistor? [duplicate]

I wonder if anyone can help me, a complete beginner, with a very basic question? I currently have a red LED connected to a GPIO pin on a Raspberry Pi, and a green LED attached to a different GPIO pin. ...
0
votes
1answer
105 views

Coffee machine wiring diagram

First of all I am a beginner in electronics / electricity. I am currently trying to connect a coffee machine to a Raspberry Pi powered relay. No problem with that, but as I am going to put apart and ...
0
votes
0answers
35 views

Power Pi and LED-Matrix with one PSU

I am new to electronics, so excuse me if my question is very silly. I have a banana Pi and a LED-Matrix like this one (http://www.adafruit.com/products/1484). I want to power both of them with one ...
0
votes
3answers
157 views

Basic power: drive 12v LED from 5v Raspberry Pi output — no 12v supply available

There are a lot of questions on here and elsewhere about this. The consensus seems to be to use a transistor to switch a power supply — implying that I have a 12v supply available. Only 5V is ...
2
votes
1answer
70 views

Connecting cables when end point rotates 360

I need to be able to rotate raspi camera 360' by motor and up/down by servo. The problem is that when I rotate it 360', all camera cables will tangle up. What is the method to make it right? I need ...
0
votes
2answers
161 views

Is it possible to combine multiple 5V USB batteries to power a Raspberry Pi for a long period of time (months)?

I need suggestions or help thinking this problem through. I want to battery power a Raspberry Pi with multiple USB battery packs (for a remote sensing application) with no need to do anything ...
3
votes
2answers
458 views

9V wallwart powering a fan via Raspberry Pi

I have a fan rated at 12V, 0.14A, 12/0.14 = 85 Ohms (taken from an old PC case) and a wallwart that outputs 9V, 1A. I have ...
0
votes
2answers
75 views

Unsure of transistor to use for LED strip

I'm trying to control an LED strip by means of a Raspberry Pi, replicating what is done here: http://popoklopsi.github.io/RaspberryPi-LedStrip/#/ It recommends using the IRLZ34N transistor between ...
3
votes
0answers
65 views

building a remotely controlled remote controlled car :) [closed]

I am a newb to EE (I am a web developer). My friend works remotely and this is what I would like to accomplish: Build a web interface like this: When he visits this interface from a remote ...
0
votes
1answer
35 views

Wiring +5V to Micro USB [duplicate]

I'm wiring 5V from a power supply directly to a micro USB cable. I'm only using the +5V and GND connectors, and leaving Data+ and Data-. While I only plan to use the cable for power, do I need to do ...
0
votes
1answer
63 views

Powering a Raspberry Pi using 15A supply [duplicate]

I'm trying to power a Raspberry Pi off a 5V, 15A power supply. Measured with a multimeter, the voltage is actually a little more than 5 - ~5.25V. I've never powered a Pi with anything more than 2A, so ...
1
vote
1answer
83 views

Comparing industrial vs. off-the-shelf analog input

Industrial controls are expensive and my company current spends a great deal of money installing them to monitor some rudimentary signals on equipment. For instance, we're trying to monitor: ...
0
votes
1answer
115 views

ULN2803A PWM LED High Watt/Ampere

Reading the ULN2803A datasheet, especially the part "Figure 13. ULN2803A as Inductive Load Driver" and after various fails to properly drive 12v RGB led strips, as i can't find the proper mosfets. i ...
1
vote
1answer
50 views

Using 12v to supply a Raspberry Pi with a switching regulator

firstly please forgive any confused terminology, I'm not an electrical engineer by trade! I have a Raspberry Pi which is operating a series of relays via its GPIO pins. On the other side of the ...
0
votes
0answers
91 views

AVR device not responding

I am using Raspberry pi to program ATMEGA32A and when I have finally set up evrything it gave a response "AVR device initialized and ready to accept instructions". But when I burned a program it ...
1
vote
1answer
26 views

How to access the selectmap pins (both hardware and software) in Virtex 5 development board?

We are trying to interface a Raspberry Pi with an Virtex 5 dev. board to read the configuration memory. We have decided to use the selectmap protocol and we understand the signals involved and ...
0
votes
0answers
52 views

Raspberry Pi + GPS + Arduino Shield

I have this GPS module and an arduino shield for the raspberry pi from Cooking Hacks. See link: https://www.cooking-hacks.com/gps-shield-for-raspberry-pi My raspberry pi B+ is fully updated i have a ...