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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18 views

LAN9512 USB hub and Ethernet Controller Problems

I'm working on a custom board using a Raspberry Pi computer on module (COM) (info and schematics here: http://www.raspberrypi.org/raspberry-pi-compute-module-new-product/. The board is based on the ...
1
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0answers
45 views

Problems with Infrared circuit on a PCB - Is it the board or schematic?

I am using the toner transfer method to apply my circuit for 6 sets of infrared emitters and collectors connected to an RJ15 cable on a PCB for use with a Raspberry Pi B+ board (connected via IDE ...
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1answer
25 views

Help needed driving an old PIC programmer from Raspberry Pi GPIO

I have been trying to use a Raspberry Pi's GPIO pins to drive an old PIC programmer board that used to have a parallel port connection before I started messing about with it. You can see from the ...
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0answers
25 views

ADC input to raspberry pi - I2C vs I2S

I'm trying to create a microphone array and take readings into a raspberry pi. I'm having an 8 bit ADC connected to the pi via I2C (SCL and SDA pins). I'm able to read samples (0-255) into my pi using ...
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5answers
783 views

Safety of using microcontrollers such as Arduino

I have been learning how to work with Arduino Uno R3, and it seems very intuitive and exciting for me. As many agree, I see lots of benefits of learning to use it at a young age. I would like to ...
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0answers
14 views

Connecting RFID reader over USB [migrated]

I just purchased the RFIDRW-E-USB RFID reader from Priority 1 Design (see this page, datasheet available in PDF form.) I have tried to make it work on my computer (Ubuntu), before plugging it to my ...
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0answers
45 views

How can I auto tune raspberry pi with a PID controller, so that I don't need to connect it to my PC everytime I have to run my controller

I am building a level controller to check the water level in my home using raspberry pi. I have a control system designed for it. But I found that to operate raspberry pi we need a wireless sensor ...
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0answers
9 views

Board-to-Board (B2B) connector for Raspberry Pi [migrated]

I have a BLE module that connects to its original MCU board with a 30 pin CN2 type board-to-board (B2B) connector. I want to use this BLE module in Raspberry Pi. I've some BLE related code that runs ...
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2answers
103 views

Embedded system for image processing project

Is it possible to do image processing (to extract numbers and text) using a microcontroller? If not, what are the alternatives to do this task?
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1answer
52 views

Change of RGB LED to cheaper one

Right now I'm reading Raspberry Pi Cookbook and I would like to create the program described in the book. Because I'm beginner and I would like to buy more (cheaper) RGB LEDs at once and also I will ...
0
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2answers
38 views

Do I need a current limiting resistor for MAX383 digital logic?

I'm trying to control a MAX383 analog switch using a Raspberry Pi, through an optocoupler (Sharp PC817), to separate digital logic from the analog section. On the analog side, I will have a bipolar ...
0
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1answer
21 views

Si8519 AC Current Sensor usage

I'm trying to find a good and practical current sensor and I found this: Si8519 http://www.silabs.com/Support%20Documents/TechnicalDocs/Si85xx.pdf My idea is monitor AC Mains current, so this Si8519 ...
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0answers
24 views

Rasp PI spectrum analyzer led strip length [migrated]

I'm new to raspberry-pi and electronics. I was looking to this tutorial: https://learn.adafruit.com/raspberry-pi-spectrum-analyzer-display-on-rgb-led-strip/page-1 Is it possible to build that ...
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2answers
62 views

Can I program 5V ATmega328P using 3.3V ICSP bus?

I am considering building a microcontroller HAT for Raspberry Pi Model B+. Since the Pi have the SPI bus exposed and some avrdude fork supports using it directly, I ...
2
votes
2answers
119 views

Rotating POV LED Cylinder Using Addressable RGB LED Strips

​My son and I are trying to build a somewhat large Rotating POV Cylinder (or Globe) making use of ready-made Addressable RGB LED strips (WS28011 or LPD8806?). After some browsing, we found that many ...
2
votes
1answer
59 views

Low voltage DC Supercap UPS Design

Most generally I'm looking to design a UPS for a low power DC device given higher voltage AC current, with storage handled by a supercapacitor, or a bank wired in parallel. For my specific case I'm ...
0
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0answers
41 views

Power with Battery + 1wire to i2C

I'm creating a project with Raspberry PI B+ where I will get energy from a truck (12~27v) or/and a solar power (6v 5.6w) to charge a battery and keep the device running until the battery finishes or ...
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0answers
18 views

Raspberry PI B+ color screen and noobs [migrated]

I am new user for Raspberry pi so I get Rasberry pi B+ and I download NOOBS on Rasbarry pi website. After that unzip that file and copy these files to SD card. Then when I power up, display the color ...
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1answer
119 views

Control 12V LED Strip with 5V from RaspberryPi or Arduino [closed]

I have a 12V RGB 5050 LED Strip with no controller and I cannot change the color without modifying the circuit. What I want to do is hook it up to my Raspberry Pi or Arduino and control the color and ...
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1answer
71 views

I2S interface ideas for multiple MEMS microphones

I plan on forming a microphone array with 4 MEMS microphones and doing the signal processing(beamforming) in matlab/C on my PC. MEMS mics i use have Digital I²S interface with high precision 24 bit ...
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0answers
40 views

Video input to Raspberry pi

I have a camera that gives analog video (composite-CCIR standard) output.I want to connect this camera to my Raspberry pi B model. I thought of using a normal video decoder and connect the parallel ...
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2answers
67 views

Play audio from raspberry pi through my car's disc changer

I'm interested in trying to buy a raspberry pi and create a small bluetooth / airplay type module that I can plug into my car somehow and get wireless audio streaming. I don't necessarily care about ...
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0answers
75 views

Help identifying a voltage regulator

I'm trying to build a portable screen so that I can watch movies around my apartment if I need to move away from my TV screen (think a WiiU gamepad or a tablet). I have many raw components and I think ...
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2answers
53 views

DC - DC Amplifier for Piezo Buzzer

I have a Raspberry Pi outputting a 3.3v DC square wave that I'd like to be able to amplify to just under 20v, the maximum the piezo can handle. Just to clarify, the piezo does not have an internal ...
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2answers
72 views

How can I make the Raspberry Pi and BeagleBone Black talk via serial?

The BeagleBone Black is great. You plug in the USB cable to your computer and a DHCP connection is established, allowing you to ssh to the BeagleBone in seconds. Unfortunately the Raspberry Pi takes ...
5
votes
3answers
444 views

What should I use for powering a Raspberry Pi at near space altitudes?

I'm planning a high-altitude weather balloon project (to around 100000 feet) some time down the line to take video and pictures of near space altitudes and I have some questions I need to ask before ...
0
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1answer
57 views

Stepper motor driver differences?

I have recently used a H bridge to control a small stepper motor obtained from a DVD drive and now want to look into controlling something larger, for example large Nema 23 steppers. From reading ...
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2answers
51 views

Joining a raspberry Pi to an external hard disk cage power supply

I have an external SATA hard drive enclosure that has its own power input. I would like to be able to run a Raspberry Pi from the same power input. The enclosure takes a 12VDC input (currently I'm ...
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votes
1answer
59 views

External power supply necessary to run two stepper motors from a RPi?

I am following this tutorial for a CNC laser engraver. I have two stepper motors from some old DVD drives and two L9110S H-bridges to control them. I am now working on putting it all together and ran ...
0
votes
1answer
92 views

I2C: How to adress the second page of a eeprom

I have an eeprom and I can't properly adress everything out of the range 0x00-0x1f. Using the Raspberry I send the following I2C command to the eeprom: "sudo i2cset -y 1 0x50 0x00 0x10 0x29" This ...
0
votes
2answers
66 views

Raspberry Pi and TLC5615 DAC

Currently I'm working in a project in which I need to programmatically control 2 currents from 0 to 1 Amp. My plan is to use two DACs controlled by a Raspberry Pi. My idea was to use the MCP4725 but ...
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3answers
111 views

8V AC signal into 3.3V digital input pin

I'm a noob and I'm doing this to learn, basically. I have a typical old-style door bell with a transformer that outputs 8V AC, the wire the goes through the push button on the door and finally hits a ...
0
votes
1answer
55 views

USB OTG: Possible to perform emulation of slave device on master with drivers recognized?

I'm not exactly sure if this should be under a separate StackExchange topic altogether (programming maybe?), if it is, please move it and sorry for the inconvenience. I'm planning to build a device ...
0
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1answer
45 views

Why is voltage properly siphoned off in this circuit?

This comes from the Raspberry Pi "fart detector" project. It says to place a 47k Ohm resistor connected to ground in order to siphon off a certain amount of voltage so that the voltage read from the ...
2
votes
2answers
133 views

Powering multiple devices from a single power supply

I am learning electronics on my own and have been having a lot of fun. I am currently working on creating a Nerf sentry gun for fun with my son. I am at a point there where I need to power multiple ...
0
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0answers
37 views

Sensor to detect that the subject is still close

I'm thinking about starting a small Raspberry Pi / Arduino project and I have to use some sensors. I want to detect if a mechanical plastic part on the other side of a wooden panel has moved and if ...
1
vote
4answers
169 views

Best way to control around 250 LEDs [closed]

I have got the task of coming up with a solution of individually controlling around 250 LEDs. As I would be a complete newcomer in programming an Arduino or whatever else there is, the computing ...
0
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0answers
86 views

How to power an arduino controlled thermostat

I'm slowly working on my home automation system which is controlled from a central Raspberry Pi. My current project is to control the thermostat / heating from the Pi based on time, temp, occupancy ...
2
votes
1answer
121 views

General wiring questions: high power LEDs, relay and microcontroller

I think I understand the Raspbery Pi GPIO pins and most of how this diagram below works, at a high level at least. First question, it's not clear to me exactly how the middle part with the ...
0
votes
2answers
139 views

How to separate two DC voltages in a dual power supply?

I have a dual power supply (Lacie ACLG-51) that supplies both 12V DC and 5V DC with a common neutral (3 wires) I have used it to drive a little system composed of a Raspberry Pi (5V), USB HUB (5V), ...
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votes
1answer
228 views

Design and build a single board computer [closed]

I want to learn how to design and build a single board computer like the Raspberry Pi. I saw a DIY project on Hack-A-Day and design something like the board in the DIY project but a bit more ...
1
vote
1answer
40 views

How to determine FET switch specifications

I am working on a DIY drone, and I (preferably) need to be able to disconnect my ESCs from the battery via the transmitter (a Raspberry Pi). After looking for solutions for a while, I concluded FET ...
1
vote
4answers
251 views

Noise from switching fans nearby disrupting the I2C bus

I have a RPi controlling a solar system which uses temperature sensors on the I2C bus, the sensors are away from the RPi (20m). The problem is that I have cooling towers and cooling compressors which ...
1
vote
0answers
59 views

Capacitive where is the touch?

I am a newbie in the world of circuits and electronics. But we all started somewhere. I have this idea about a street sign that should be used as an instrument. All most like a Theremin. Touching it ...
0
votes
1answer
67 views

Power supply for Raspberry Pi

Before you tell me that the question has already been asked, only similar things have been asked. I need to power a Raspberry Pi with some electrical equipment attached to it. The Pi needs to run ...
0
votes
1answer
65 views

Power supply for usb devices

I had a question that I was hoping someone could help with. I am building a cluster of raspberry pis to do research on and I decided the best way to power all the nodes was through micro usbs. (I ...
2
votes
0answers
170 views

How to fix RaspberryPi HDMI-DDC/CEC issue while keeping ESD protection?

The RaspberryPi (Type B, all revisions before B+) shows a more or less well known issue with the CEC/DDC of connected HDMI devices. When powered down CEC between the connected TV set and other devices ...
0
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0answers
46 views

Computation capacity for a sound localization and tracking system

I'm working with Raspberry Pi and the Generalized Cross Correlation - Phase Transform (GCC-PHAT), i want to do synchronized sampling on 6 signals of 6 microphone amplifiers. The Raspberry Pi has no ...
0
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2answers
195 views

DIY 5v Solar Panels

In a nutshell : What is a good way to power a 5V project with one-two 0.5 V solar cells? The motivation is as follows: My project needs about 2.5-5 Watts from the solar panel. Also, this project ...
2
votes
5answers
620 views

Simplest uni-directional level shifter (3.3V -> 5V)

I want to drive a WS2801 LED strip from a Raspberry Pi GPIO. I have connected the MOSI and CLK pins directly to drive the LED but it is not working as the WS2801 datasheet says that a high level is ...