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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39 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 ...
-2
votes
0answers
39 views

Internet of Things - Urinalysis in the toilet plate [on hold]

I was thinking it would be a nice idea if a detector like this can be installed inside the toilet plate and connected to a Raspberry PI for example. I was wondering though, what is the best place I ...
0
votes
1answer
82 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
24 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 ...
0
votes
1answer
48 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
40 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
0answers
60 views

Easy WatchDog Timer Circuit for Reset Relay

I am searching for a easy WatchDog Timer Circuit which Reset a 5V circuit I want to reset my Raspberry pi If it does not response. I try Raspberry Pi internal Watchdog but its not working for my ...
0
votes
1answer
54 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
43 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
51 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
40 views

Can this motor shield be used with a raspberry pi and not an arduino? [migrated]

Is it possible to wire this motor shield designed for the Arduino up and get it to work for a Raspberry Pi 2? http://linksprite.com/wiki/index.php5?title=Motor_Shield
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0answers
30 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 ...
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votes
0answers
37 views

Raspberry Pi Circuit Problem

I am currently trying to build a robot using raspberry pi. As a power source I am using an battery pack which provides 1.5 A at 8.4 Volt. I set up the circuits so that the power source was connected ...
0
votes
1answer
63 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
47 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 ...
-1
votes
4answers
77 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
85 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
34 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
106 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
66 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
104 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
449 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
53 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
60 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
33 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
58 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
77 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
93 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
44 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
75 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
23 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
42 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 ...
4
votes
2answers
147 views

Why do I need this relay?

Hopefully I don't get torn apart for such a noobie question (but how else do you learn right?). I got a Raspberry Pi to hopefully learn a bit about electronics (and because it was 35 dollars). I asked ...
0
votes
0answers
40 views

Beginner needs help - Rpi controlled lights question

I'm currently working on a home automation project and I've came across a roadblock. Hopefully someone can tell me if what I want to do is possible and maybe point me in the right direction. This ...
0
votes
2answers
353 views

RF Receiver for 433mhz and 315mhz?

I have a XD-RF-5V receiver wired to my Raspberry Pi listening with RFSniffer (433Utils). I also have a XD-FST 433.92mhz transmitter wired to my Raspberry Pi running codesend (433Utils). I can ...
-1
votes
4answers
168 views

Switch from 3.3V to 24V Raspberry Pi

I want to convert the Raspberry Pi's 3.3V output to 24V as this is what the I/O uses on the Universal Robot arm, UR5. The 24V is supplied by the UR5 and so I thought that a simple NPN transistor would ...
0
votes
1answer
21 views

ad5359 address not shown

I am working AD5259 , its a digital potentiometer. Its connected to i2c bus on raspberry pi. But the address of device is not shown. Datasheets says its 0X18. I guess the device does not respond to ...
-1
votes
1answer
103 views

Detect open or closed circuit via USB sensor

I have a relay which I need to detect the state of (similar to this question but no current flow) and would like know what the easiest method would be to detect the state via USB and Raspberry-pi. I ...
0
votes
0answers
187 views

Raspberry PI PWM Common Anode 5v 12v Lamp Circuit

i'm not an Electronical engineer, i prefer to write codes. But lately (since about 2-3 months) i finally had the balls to connect something to the raspberry PI's gpio. Two days later i already tested ...
0
votes
0answers
28 views

How to power multiple different LED light strips with a single adapter [duplicate]

I am building a fun electrical project soon using up to 16 LED light strips and I am having worries on either breaking them or under-powering them. The project takes in MP3 audio files and uses a ...
0
votes
0answers
59 views

How can I interface a Raspberry Pi with a bare Atmega128

Currently in this project, I have an Arduino Uno controlling some low-level hardware, which interfaces to software running on a Raspberry Pi via the Arduino USB cable. I'm looking to shrink the ...
0
votes
1answer
66 views

Drive relay with Npn transistor thanks to RTC and Rpi

It' s my first projet in electrical and i m not very sure about what i'm doing ... I Would like to drive a relay thanks to a Rpi and a RTC clock that has a alarm feature ( ds3231 with high-z/active ...
0
votes
1answer
96 views

How can I relay 120VAC with a raspberry pi?

I have five 75W 120V AC LED lamps on a dimmer switch. They draw 13 watts each (375W total). I also have a 600W Lutron dimmer switch hooked up but the thing buzzes when the lights are dimmed. I also ...
0
votes
2answers
94 views

74HCT244 UART level translator, how would the circuit look?

I am building a UART 3.3V to 5V Level translator between a Raspberry Pi and a ATMega328. The 74HCT244 is my choice of translator but I can't find a good example of of hooking it up. Am I right that ...
0
votes
2answers
122 views

Simple transistor circuit

I have been studying transistors and decided to try my knowledge in my lab to find out that nothing works as I thought it would.. I had a small lamp 12V and a handful of 2N3904 transistors, along ...
-3
votes
2answers
120 views

Controlling a DC motor directly with Raspberry Pi GPIO without any external IC or Transistor

I need to control a DC motor without the use of an external IC or transistor with the raspberry pi GPIO. I do not need direction or speed control. All I need is the motor to controlled by raspberry pi ...
0
votes
1answer
59 views

How to use 2 power supplies in transistor key?

I have 2 power supplies in my scheme, one is from Raspberry Pi GPIO and one is 9v battery. I need GPIO output to work like a button, e.g. when output from GPIO is 1, battery should power the scheme ...
0
votes
1answer
65 views

How to use 2 power supplies in my scheme?

I am building a device to send a signal from Raspberry Pi GPIO to a vibration motor. Here is how it should work: the RPI outputs 0v or 3.3v, and when it outputs 3.3v, the vibration motor should ...
1
vote
1answer
151 views

I2C: How to connect Raspberry Pi (power cut) to ATmega328p

I would like to interface a Raspberry Pi with an ATmega328p microcontroller using the I2C bus. These two parts act both as masters, but not at the same time. The Raspberry Pi is powered through the ...
1
vote
1answer
108 views

Burning out relays when supposed to be within ratings

I am using this Normally Closed Relay on a 24V circuit: DataSheet The circuit is 24VDC source, which I measured the Amperage in series to be 29mA at the highest. I've breadboarded a lower voltage ...