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 ...
0
votes
2answers
34 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
20 views
Raspberry PI freezes [migrated]
I am running my Pi with an Iphone charger( 5V ~1A). It was running quite well and no hangups or anything. I was mostly using ssh to use it.
Recently, I hooked up and ADC(MCP3202) to connect a sensor ...
0
votes
0answers
40 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
197 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
55 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
83 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 ...
0
votes
1answer
101 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
votes
0answers
30 views
Driving Bi Polar stepper motor using DRV8825
I am attempting to drive this stepper motor using this driver. I have it hooked up exactly as described in the diagram on the same page, I have gone over and over my breadboard connections. The issue ...
1
vote
2answers
73 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 ...
2
votes
1answer
80 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
111 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
0answers
37 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 ...
0
votes
0answers
52 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
75 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
175 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
72 views
Raspberry Pi with SPI RFID Reader/Writer
I've been using Arduino for years and now transforming to take a sip on the Raspberry Pi. I've been using the MF522 13.56MHz RFID Reader in my Arduino projects, it uses SPI interface to communicate ...
1
vote
1answer
107 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
68 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
127 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
73 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
67 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 ...
1
vote
1answer
78 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
308 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
91 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
206 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
81 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
141 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
63 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 ...
1
vote
0answers
70 views
Raspberry Pi with SMBus SmartBattery
I'm trying to interface a Raspberry Pi with the mini-box OpenUPS. It claims to implement the Smart Battery SMBus specifications.
I can read data from the device using the i2c_smbus_read_word_data() ...
2
votes
2answers
101 views
Mini Skee Ball - Detecting a ping pong ball
Background
I really want to do something with my raspberry pi, so I thought of a game that's a mix between skee ball and beer pong. Basically, the build is a mini skee ball board (about 20x24 ...
0
votes
2answers
98 views
How do I connect this 3.3V system and 6V ish system together?
I have an old 'Cybot' robot I built from a kit. I'm trying to mount a Raspberry Pi on it to act as brains. I'm a computer programmer, but my electronics knowledge is very limited. Have access to basic ...
5
votes
2answers
135 views
Using a 5v voltage regulator - Capacitors necessary? Better options?
I am very new to electronics. I am learning as I go, and I haven't quite found the answers I need; when it comes to programming, I'm not afraid of mistakes as they happen constantly. With electronics, ...
1
vote
2answers
130 views
Bidirectional Level Shifter without IC
I'd like to connect R-Pi serial to PC's RS232 port without IC (such MAX3232), using only diode (thus block negative voltage to 0V), voltage divider resistors, and common BJT.
For TXD (RX from R-Pi ...
0
votes
2answers
180 views
Raspberry Pi GPIO
I need to make a connection between the "Device"'s 2 wires using a Raspberry Pi, but I am unsure how to go about doing this (and I don't want to just play about with it and get it wrong as I might ...
1
vote
0answers
115 views
Dimming USB Led Lamp
So, currently I have a project that consist in the following:
We have 2 USB Led lamps. (e.g 13 leds, 5V, ~200mA)
To these lamps, we would like to control the intensity of the light, through a ...
2
votes
1answer
100 views
Raspberry Pi: driving Servo with PWM
I'm experimenting with a small servo motor with the raspberry pi using PWM (pulse-width modulation). My understanding is that the servo should respond to different length of pulse. I should be seeing ...
-2
votes
2answers
132 views
raspberry pi + USB Hub [duplicate]
I bought a cheap USB Hub Powered to connect my Raspberry Pi and two External Seagate HD (USB 2.0/3.0), but obviously that 400 mA is not enough for all this things.
So, I want to buy a new AC Adpater ...
2
votes
1answer
114 views
Control old printer motor with position ring
I purchased two old printers at a garage sale today in hopes of dismantling them and playing around with some stepper motors. After tearing both of them apart I discovered that there are no stepper ...
2
votes
3answers
144 views
What do you use a board like this for?
I'll start by saying that I'm a software guy, I know literally nothing about electronics.
I recently bought a raspberry pi, and while browsing at my local electronics shop, saw this board for $5.
...
2
votes
1answer
139 views
How to connect a pulled motor from a printer to Breadboard and control with raspberry pi? [closed]
I managed to salvage a couple of motors from a worn down old printer, and I'm unsure of how to get about connecting it to a breadboard and then to a Raspberry Pi. I've got a cobbler kit for my Pi that ...
2
votes
2answers
216 views
Multiplexing large LED matrix
I have a project which involves building a 64 x 48 (3072) LED matrix driven by a Raspberry PI computer. I am a first-year computer engineering student so I am still inexperienced with shift registers ...
0
votes
1answer
89 views
Current flows from the source towards the sink
I happened upon the following schematic:
simulate this circuit – Schematic created using CircuitLab
It's supposed to reduce the max.voltage between the GPIO input pin and the current ...
1
vote
1answer
199 views
Is De0-Nano an alternative to Arduino/RaspberryPi?
Arduino and Raspberry Pi are touted as ideal programming boards for beginners and hobbyists. Could De0-Nano fit in that role, too?
What does Arduino or RaspberryPi have that De0-Nano does not?
3
votes
2answers
256 views
Manual SPI interface on Raspberry PI
I am trying to control a MCP4131 digital pot from my Raspberry Pi using the
library here
Using the GPIO pins, I am "emulating" an SPI interface. I bring the ChipSelect pin to low, write my byte, ...
1
vote
2answers
68 views
Peak voltage rating means voltage drop?
This LDR is said to have Peak voltage rating of 400V in the description. Does this equal the voltage drop, meaning that I need to supply at least 400V or is it the maximum voltage value?
0
votes
2answers
131 views
Multiplex two I2C ICs into four 7 Segment displays
I currently have two PCF8574AN I2C 8-bit IO expander ICs. Is there a way I could have two seven segments be driven off one IC (So i could run four seven segments displays off the two ICs that I have). ...
3
votes
2answers
90 views
Using 2 different LDO with the same voltage in the same application
I'm using a Raspberry Pi and have designed an extension board (Like the Pi-face) but I have a question about the power supply. I need 3V3 on my board, but the 3V3 from the Raspberry is not strong ...
3
votes
1answer
99 views
Can I use Sn only solder for PCBs?
I bought the Raspberry Pi cobbler kit a while ago, and I needed to solder a part together. The local hardware store (Useless ACE) only has a specific solder, which has just Sn, a diameter of 1.0mm and ...
1
vote
0answers
157 views
Raspberry Pi vs Arduino ADK (with phone tethering)
I was doing some research for my capstone project next year. Basically it is an autonomous rover, designed to scout out outdoor areas and send back video/pictures to a website.
So far, our initial ...
5
votes
3answers
370 views
Serial bus Raspberry Pi to multiple AVRs
Background: I'm trying to replace the electronics for a ice hockey scoreboard. The old electronics had the following issues:
It stop working. I have since discovered that a couple of diodes and ...
