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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2answers
24 views

Reset the raspberry pi with a relay

I'm going to use my Rasp as a GPS tracking and it should be running even if the car is off; however, I don't want run out the car battery. To make it happens I added a battery controller ...
0
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0answers
38 views

Can I link Ethernet chips on PCB? [duplicate]

I read up on the Raspberry Pi Compute unit and wanted to link a hand full for networking. Unfortunately, they do not come with native Ethernet, but USB. So I was thinking of linking each compute ...
1
vote
1answer
66 views

H Bridge Control using Raspberry PI / Micro controller

I am looking for input on this circuit that I have designed. I am currently working on a project called the Net-EEL RC Car. It is an RC car that will be controllable using Network Socket Servers / ...
0
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0answers
44 views

DVD player internal interface [migrated]

Is it common for DVD players to include an IDE DVD drive? The unit in question (Panasonic DMR-E95H) has an internal HDD, which is a perfectly ordinary 3.5" IDE drive. The unit's power supply is ...
0
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0answers
28 views

Selecting relay for raspberry pi

I'm currently working on a raspberry pi project.In which i have to control four 30W 0.25A 230V Bulbs(which works using main 230V power supply) using output from GPIO pins.I'm a beginner in ...
0
votes
2answers
35 views

what do you connect to IN+ and IN- for ADC differential input configuration?

I was trying to understand how to read analog inputs on a raspberry pi. I found this video post and I think I understood how it works. https://www.youtube.com/watch?v=oW0mTwFck_c This video uses a ...
0
votes
1answer
50 views

3v Relay raspberry

I'm trying to drive a 3v Relay with a schematic like this: Relay is a HWE JRC-21F and transistor is a PN2222A instead of a BC337. This won't work unless I connect 3.3v directly to transistor base, ...
0
votes
0answers
45 views

Hardening Raspberry Pi performance for reliable 24x7x365 use [migrated]

I am working on a project, which currently is a pet project and am using Raspberry Pi model B+ for it. But, while working this prototype a few questions have started coming up, so my question is in ...
0
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0answers
51 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
vote
0answers
55 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 ...
1
vote
1answer
33 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 ...
0
votes
0answers
53 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 ...
5
votes
5answers
832 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 ...
0
votes
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 ...
1
vote
0answers
59 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 ...
0
votes
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 ...
0
votes
3answers
147 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?
0
votes
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
votes
2answers
47 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
votes
1answer
30 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 ...
1
vote
2answers
77 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
161 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
82 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
votes
0answers
46 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 ...
1
vote
1answer
188 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 ...
0
votes
1answer
91 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 ...
0
votes
0answers
54 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 ...
0
votes
2answers
97 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 ...
0
votes
0answers
77 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 ...
0
votes
2answers
69 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 ...
0
votes
2answers
89 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
463 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
votes
1answer
72 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 ...
0
votes
2answers
61 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 ...
-1
votes
1answer
70 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
112 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 ...
-1
votes
2answers
73 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 ...
1
vote
3answers
119 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
74 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
votes
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
147 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
votes
0answers
39 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
170 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
votes
0answers
99 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
130 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
152 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), ...
-1
votes
1answer
310 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
43 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
257 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 ...