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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0answers
56 views
Connecting Raspberry Pi GND to GND of external source
This is probably a very basic question but the concept of GND always confuses me.
My setup:
Raspberry Pi connected with MicroUSB to a power supply.
External circuit supplied by an ATX power supply ...
1
vote
1answer
61 views
Powering a raspberry Pi using an ESC (Electronic Speed Controller)
I'm working on a quadcopter project using Motors/ESCs, an Arduino DUE and a Raspberry Pi.
I have 4 motors and 4 of these Opto ESCs.
At the moment I have the raspberry Pi plugged into the mains ...
2
votes
0answers
53 views
Remote communication with home server [migrated]
I make home micro-server (based on Raspberry Pi). It has Internet and works 24/7. The server make some home automation, monitoring and control. It has no static public IP address (it's assigned via ...
1
vote
3answers
179 views
How do I easily power a “mashed-up” project?
I'm working on a hobby project that involves a Raspberry Pi (with a powered USB hub for reliable wireless), an Arduino (driving a hobby servo, controlling some LEDs, etc.), and an audio amplifier (not ...
3
votes
2answers
64 views
Driving 7 segment displays through Raspberry Pi's GPIO
So I was thinking of wiring up four 7-Segment displays through the Raspberry PI.
I'd do that by multiplexing each of them, and came across this:
...
0
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0answers
38 views
Controll TV Channels via HDMI via Raspberry Pi [migrated]
So I have:
1x LG 42" LED LCD TV
1x HDMI Cable
1x Raspberry Pi (Model B)
I have been looking around but did not find much on this topic except a disscussion on how to do this via SCART. I'm ...
0
votes
0answers
37 views
How do I program a serial EEPROM IC using a raspberry Pi?
I am trying to program the 25L12835F Serial EEPROM with the firmware of the Pineapple WiFi router. I have the u-boot.bin file from Alfa. I have tried a programmer from eBay, but the software is unable ...
0
votes
1answer
67 views
Raspberry pi power supply
I am a beginner to this Raspberry Pi board. I wanted to power my board using 5V adaptor. I am currently having phone charger whose output specifications are 5V, 0.7 to 1A. So can I use the same ...
0
votes
1answer
53 views
Drive a DC motor as the maximum speed with a Raspberry PI
I am new to the Raspberry PI and I don't have strong background in electricity (but I'm here to learn).
The problem:
I have a dc motor that works at 12V, and I'm trying to let it run with the raspi ...
2
votes
1answer
58 views
Clamp diode to a solenoid activated by a raspbery pi, how do I choose it?
I need to activate a solenoid using a raspberry Pi, to do that I'm using a TIP121 to drive the current and a 12V power supply to power the solenoid. I also put a clamping diode (1N4001) but I'm not ...
0
votes
1answer
71 views
How can I trigger a photography strobe from a iPhone LED flash?
I would like to trigger a photography/studio strobe flash based on the flash of an iPhone camera's LED flash. I'm picturing a device that I could attach to the back of the iPhone temporarily when I ...
5
votes
1answer
110 views
Switching MOSFET from Raspberry Pi GPIO
I'm trying to drive a STP16FN06 from a Raspberry Pi GPIO pin but I'm a bit lost.
The schema below represent (I think) how it is currently wired, on the left the RPi pin + ground and on the right a 5V ...
5
votes
1answer
172 views
Low-side MOSFET: Current seems limited
I'm trying to use a MOSFET, an N-channel (specifically this one), with a gate controlled by an AVR to power on/off a Raspberry Pi (powered through GPIO), I'm using it on the low side. (Both share the ...
1
vote
1answer
50 views
Shift register with the Raspberry Pi
I have recently bought some 74HC595N (datasheet) shift registers to play with using my Raspberry Pi. The Raspberry Pi has a general purpose clock that I think I should be able to make use of, however ...
2
votes
1answer
48 views
How to control PcDuino pins from Java?
When I had Raspberry Pi I used to control the GPIO (pins) from a Java application using the Pi4J library.
Is there any library to control the GPIO (pins) on the PcDuino using the Java language?
7
votes
2answers
276 views
Using a microcontroller to turn on LED strip
I have 60 leds that came in a strip. One meter of the led strip requires:
400 milliamps
12 volts
I want to control these LEDs with micro controller. I'm thinking of using a TIP120 and a ...
0
votes
1answer
50 views
Wiring a 24-volt Swamp (Evaporative) Cooler for Control With Relays
I am attempting to build a raspberry pi controller for my MasterCool swamp cooler, which has a rather dumb controller. The cooler has the 24V low-voltage control kit (as opposed to 120V or 240V direct ...
1
vote
1answer
33 views
Clocks setup when programming Atmel via ISP?
When programming an Atmel microchip over SPI (ISP), what external clocking do I have to provide to programee? Does it have to match programmer's internal clock frequency, or can be totally different ...
1
vote
1answer
83 views
Raspberry Pi / Arduino Button GPIO pins
I got myself a little button to start playing around with. Attempting to hook it up to a Rpi.
What I wanted to confirm was the purpose and pins for each wire. The button I got is ...
1
vote
0answers
114 views
Power coming from unknown source
Power coming from unknown source
Hi, I have a quite complex circuit with 5 DC/DC Converters all being powered by a 28V power supply and with a common ground. All DC/DC converters have a on/off ...
0
votes
1answer
163 views
LCD screen gets hot and sucks power from Raspberry Pi
Has anyone else experienced LCD screens overheating, and drawing too much current? I was trying a GPIO project with my Raspberry Pi in an attempt to interface with an LCD screen but for some reason my ...
4
votes
1answer
134 views
Choosing transistor for a raspberry pi switch
I'm trying to design a circuit that will control the power to a raspberry pi with a button. The basic usage is:
first button press-> rasp powers up.
second button press-> rasp continues with ...
-1
votes
2answers
119 views
Raspberry pi relay check from remote
I'll start saying that I'm almost noob on electronics, so that's why I'm here.
I'm looking for a smart way to check the state of an RF relay module remotely.
This is the relay module:
The module ...
0
votes
1answer
39 views
Development Board Choice [closed]
I've been working with the ATmega328 microcontroller for some time, with great success, but recently my projects have gone beyond the edge of its capabilities. I thought of switching to ATmega2560 but ...
0
votes
3answers
234 views
How to connect Raspberry Pi to House Alarm Serial Bus (DSC Keybus)
I have a DSC 1864 House Alarm and I want to connect up my Raspberry Pi's GPIO to the Keybus (a serial data communication protocol used by the alarm).
I would say my knowledge of electronics is novice ...
0
votes
0answers
91 views
I2C Raspberry Pi to PIC24F
I'm new to PIC's and PIC programming but I'm working on a little project to try get a PIC24F32KA301 to communicate with a Raspberry Pi using I2C. The Raspberry Pi is the master and the PIC is the ...
7
votes
4answers
320 views
shorting a remote control pushbutton with GPIO and a transistor
I'm trying to control my garage door remote with a GPIO pin from my Raspberry Pi. Instead of driving a relay, it would be much easier to just short the pushbutton on the remote. Is this how I ...
1
vote
1answer
80 views
Connecting an always on LED to a raspberry pi [duplicate]
I'm new to electronics, so I thought I'd start simple and just connect an LED to the GPIO on the raspberry pi, to pin 1 (3.3v) and the ground pin.
But I'm having trouble calculating the resistor I ...
1
vote
1answer
169 views
Shutdown controller for Raspberry Pi (+ other components) on mains AC
Inspired by the Shutdown Controller for Raspberry Pi in a car I would like to know if it is possible to build a similar circuit working with ~230V AC instead of 12V DC.
I have a power adaptor where I ...
-1
votes
1answer
203 views
How to construct an uninterruptible power supply for my Raspberry Pi
I want to construct an uninterruptible power supply for my Raspberry Pi that switches from one PSU (USB) to another (batteries) if the first one fails. Naturally, I don't want to drain my batteries ...
1
vote
2answers
129 views
Weather proof enclosure for Raspberry Pi
I have built a device based on Raspberry Pi who have to be located on a house's roof.
I use an IP67 enclosure with IP69 pressure compensation element with gore-tex membrane. I add silica gel before ...
3
votes
1answer
223 views
Drive stepper motor from Raspberry Pi
I am looking to drive this stepper motor from the Raspberry Pi. I have successfully followed this tutorial to get the small stepper motor used in the tutorial working correctly. I am using the L293D ...
0
votes
1answer
181 views
What are some inexpensive easy to use SPI devices I can experiment with? [closed]
Introduction
I'm completely new to EE, but have decades of software development experience. I want to learn to interface with multiple SPI devices on a single SPI interface on a Raspberry Pi. I'd ...
0
votes
1answer
66 views
Touchscreen interference (metal frame)
I have one of these. It's connected to a raspberry pi. It's being mounted against a metal frame, but when it's mounted, i get interference on the touchscreen (the mouse jumps all over the place). How ...
1
vote
0answers
73 views
What is the best way to take multiple near-simultaneous pictures from 6 cameras on a development board?
I thought I could use a powered usb hub, connect the 6 cameras to it, connect the hub to the raspberry pi and capture the images one after the other quickly using the motion package. But I can't find ...
1
vote
1answer
88 views
When does raspberry Pi pin reset its state
Using Arduino, I'm trying to detect whether Raspberry Pi has successfully turned itself off. I first tried to check on the pins that are used for serial communication between said devices but the pin ...
3
votes
3answers
575 views
understanding how a motor is controlled with an L293D and raspberry pi
See update, picture of robot below.
So today I hooked up a motor and made it spin with my raspberry pi and an L293D by reading this tutorial.
This is what the circuit looks like (larger pictures):
...
0
votes
0answers
184 views
Raspberry Pi with SPI RFID reader/writer
I've been using Arduino for years and am now transforming to take a sip on the Raspberry Pi. I've been using the MF522 13.56 MHz RFID reader in my Arduino projects. It uses an SPI interface to ...
1
vote
1answer
142 views
How do I connect non-I2C devices to an I2C bus?
I'm quite new to electronics and just trying to do my first Raspberry Pi based system: one diode, one pressure sensor and LCD 1602 with keypad shield (the one for an Arduino board). The way I'd like ...
3
votes
1answer
98 views
16X2 character LCD changes contract intermittently and doesn't work with raspberry pi
I've been following adafruits RPi tutorials (and bought their starter kit)
I had an Sparkfun LCD Kit lying around. (It has an HD44780 controller LCD, a 10K trimpot and a 16 pin male header)
I ...
4
votes
1answer
187 views
transmit data wirelessly under water?
I am looking into constructing a small submarine with a Raspberry Pi. This is just for a hobby project but my idea is to have it communicate with the surface wirelessly. I know that normal radio waves ...
0
votes
2answers
144 views
Low power method to turn Raspberry Pi on or off using an Arduino
I want to use an Arduino to control power to a Raspberry Pi.
The power supply to this system is a solar panel with rechargeable cells, and the Arduino will turn the Pi off to preserve power in ...
0
votes
1answer
93 views
Can one use PiFace for A/D conversion?
the PiFace is advertised as the shield "connecting the Raspberry Pi to the real world" and they claim that this includes things like temperature sensors. I know how to read the temperature using an ...
2
votes
1answer
132 views
Power source select for Raspberry Pi
I'm creating a board which takes an external power source to drive motors which are controlled by a ULN2003A connected to the Raspberry Pi GPIO.
It would be nice if when the external power source is ...
0
votes
2answers
956 views
Fastest boot time comparisons between RPi, BeagleBone Black, UlinuXino, etc?
I can find many tables comparing the specs of the latest development platforms like Raspberry Pi, BeagleBone Black, and UlinuXino. However, as all of them run some flavor of Linux, there is going to ...
1
vote
2answers
154 views
Netduino or Raspberry PI for my requirements?
I do not want to start a religious war, and believe that neither of them can be better in all circumstances. So, let' consider my circumstances.
My problem is that I am a software guy with no ...
2
votes
1answer
379 views
Headphone/Line out voltage for driving a LED?
I'm currently messing around with infrared LEDs and controlling my TV and various other devices from it. I have the spec and want to write a short Python script to generate these codes, and thus turn ...
0
votes
0answers
111 views
Raspberry Pi not successfully booting with USB hub
I recently got my Raspberry Pi Model A, I decided to use a normal USB hub (with no external power source), it appears to be supported, as well as my other devices on the hub. My Pi has booted before ...
0
votes
0answers
159 views
Raspberry Pi SPI and AtMega
I'm trying to make multiple DMX modules that communicate with a raspberry pi through SPI, I would assume SPI would be the fastest ?
The modules are made of an atmega (not sure which, but probably ...
0
votes
0answers
99 views
AXDL345 Accelerometer on SPI Raspberry PI with bcm2835
I have this accelerometer ADXL345. I am trying to read data from it from SPI using the BCM2835 Library here.
When I run this, I SOMETIMES get a value back (other than zero), but it's never ...
