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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13 views

migrating questions to raspberrypi.stackexchange.com [migrated]

There appears to be a spate of migrating questions to raspberrypi.stackexchange.com just because they mention Raspberry Pi. A recent example is ...
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1answer
32 views

operating landline phone via mobile phone [on hold]

I am making a small DIY project to operate my wired landline phone (twisted copper cable) using my mobile phone. Use cases: Dial number on landline via mobile device. Receive incoming landline calls ...
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3answers
47 views

Wire microswitch so state can be read from Raspberry gpio

I'm trying to check whether a series of valves (described here Can I measure if current is on or off in cable with 24v DC (in a cheap way)) are open or not. Updated question to be more specific after ...
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1answer
85 views

Can I ignore resistor for IR LED?

I have two IR diodes and I want to connect them to my Raspberry Pi. From Pi I have 3.3V voltage. Diodes are TSAL 6200 . Can I connect them to PNP and my PI without resistor safely with this wiring?
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0answers
19 views

HDMI input raspberry [migrated]

i would like to know is it possible to process images that came from a HDMI source (not a camera) with raspberry pi and openCV, even by using the hdmi to csi-2 bridge (b102) or by using hdmi to usb ? ...
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0answers
78 views

Powering a Magic Mirror

Background: I am trying to create a magic mirror similar to this: Problem: I need to power two devices, one monitor and one raspberry pi. My approach was the same as in the article (which also ...
3
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2answers
122 views

Mechanical Switch in parallel to the Micro Controller working in Sync

Here is the image for my requirement,want to operate Load Lamp of 230V AC with Mechanical Switch in parallel to Controller where one can 'ON' the Load Lamp from the Mechanical Switch and 'OFF' from ...
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3answers
90 views

Want to replace raspberry pi with something cheaper and customised [closed]

Recently I have built a project using raspberry pi, I am using the USB ports, LAN, 3.5 mm jack headphones, file system in raspberry pi. Now I want to replace raspberry pi with something cheaper and ...
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2answers
52 views

M-Bus (Meter-Bus) Arduino / RPI [closed]

Is there some one that have manage to connect to a M-Bus (Meter-Bus)? With a Arduino or RPI? Maybe a M-Bus to serial is the way to go?
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1answer
38 views

Wireless data transmission options for streaming video

I am in the initial stages of planning a project that involves the wireless transmission of data between either an Arduino or Raspberry Pi and a base computer/RPi. Data transmitted includes the state ...
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1answer
56 views

How to determine range of wifi module

I am starting to plan a project that involves either an Arduino or Raspberry Pi (haven't decided yet) connected to a number of sensors. The unit will be located outside, battery powered and will send ...
0
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0answers
34 views

How is data being sent to this Dot Matrix LCD? Can I just read one of the pins on the board using SPI?

I'm good with programming but am getting better with electronics. Can you guys easily tell how data is being sent to my LCD? I think it's using SPI but am not sure. I built a music/video/network box ...
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2answers
97 views

Intercepting graphics card output?

I was wondering what it would take to intercept a PC's graphics card output or parts of it. First of all I'm wondering if you could even intercept the output without increasing the latency between the ...
1
vote
1answer
44 views

how can I current-limit a Raspberry Pi 2 USB host port so phones/tables do not try to charge

Although my use case is specific to Raspberry Pi, I think the question is a general USB Host port question. When a phone/tablet (especially iphone and ipad) is connected to a Raspberry Pi 2, if its ...
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2answers
46 views

Optocoupler w/ RasPi & Door Buzzer

I'm currently trying to make a system where sending a message to my Raspberry Pi from my phone will send a signal to my apartment's buzzer to open the front door, however I've been having problems ...
0
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1answer
38 views

Unnatural AD9850 Output Attenuation

Yes, another question about this DDS. However, I think mine is sufficiently different from the others I've read. I purchased an AD9850 board on Amazon for $17 from "NooElec" (see here). I've been ...
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0answers
3 views

Trying to modify the monitor switch to power up a Raspberry PI [migrated]

I have a Xerox "a7-17i" monitor. That I am trying to modify it so when it's powered on the monitor and the Raspberry PI gets powered ON and when it's powered OFF it will turn off the Raspberry PI and ...
0
votes
1answer
38 views

Indoor Location Tracker for Automated Cameraman

I am new to Electronic Hardware, but have prior experience with Custom built web applications. Recently purchased Raspberry Pi and have been thinking of different projects to make with it as the ...
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2answers
41 views

CAN BUS system compatibility? DB9 to M12

I have a CAN SYSTEM with a M12 5pin male plug that acts as a sensor processor. It runs on 12 volt. I am trying to feed this system with a Raspberry Pi B system using this CAN BUS board: ...
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0answers
39 views

Raspberry Pi 2 Arduino Mega USB Communication [migrated]

we are trying to control our rover via wifi. the idea is motor drivers are connected to arduino mega and the mega is connected to raspberry pi 2 (raspbian os) via USB. raspberry pi is receiving ...
0
votes
1answer
33 views

Media converter (eth/fiber) problem in communication

I have a system which looks like that: CPU(macbook)<-->thunderbolt<-eth->ethernet media converter<-fiber->ethernet media converter<-eth->raspberry pi 2. Both CPU and RP2 have static IPs. ...
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3answers
33 views

16/18 VAC to 5 VDC UPS

I'm new here so please bear with me. I'm planning to replace my old central alarm system with a new raspberry pi, which takes 5 VDC input. My old central uses a separate 230 VAC to 16/18 VAC ...
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6answers
194 views

Designing a circuit with a bi-colored LED for indicating power vs. system ready

I am working on a headless Raspberry Pi project. Being headless, I can't visually tell when the system is fully booted and ready to accept tasks. While a Pi doesn't take an inordinate about of time ...
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votes
0answers
11 views

How To Switch On/Off A Circuit using GPIO [migrated]

I have a simple circuit that runs on 5 volts. Let's just say for simplicity that it is a circuit with an LED that lights up when a push button is pressed. The problem is that it has a push button ...
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0answers
34 views

MCP23017 with Raspberry Pi sometimes reset

I use MCP23017 with my Raspberry Pi and sometimes MCP23017 resets. MCP23017 is powered from Raspberry 5V and reset pin is also connected to 5V. MCP23017 is connected to 2 x 8-channel relays. Relays ...
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votes
1answer
98 views

Beginning electronics programming [closed]

I have substantial experience programming computers, but never programmed micro controllers or built digital equipment. The closest I ever came was controlling modems by reading & writing ...
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1answer
54 views

What are the options for short range under six inches 3D multi point location tracking?

What methods exist to track the position of points relative to each other. Particularly what methods allow the determination of the distance between up to ten points at once. The distance ...
0
votes
1answer
55 views

Controlling servo: how to determine the angle and needed pulse-width?

I'm kind of new when it comes to using servo's with an Raspberry Pi. Although I do have some experience, I'd like to understand things a bit better. Therefore I would like to share some questions with ...
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votes
0answers
36 views

how to control a 12v dc wiper motor with raspberry pi?

I am going to use raspberry Pi for the first time and am looking forward to any suggestions which describes whether a raspberry pi can be used for controlling a 12v Dc wiper motor or not. If yes, how? ...
1
vote
1answer
82 views

Interfacing Raspberry PI to HoneyWell alarm system (3V vs 12V)

simulate this circuit – Schematic created using CircuitLab I've been working on a similar project as this but with a HoneyWell alarm system. I've managed to lower the voltage from the ...
0
votes
2answers
60 views

Optocoupler Question

I'm currently trying to create a system to open my apartment's door (using the buzzer) using my raspberry pi, and thought that using an optocoupler would be the best solution - although I'm a complete ...
1
vote
1answer
64 views

Powering LED strip and Raspberry Pi from a single 10A 5.5V power supply

I plan on making an ambilight project for my TV, using a ~4m 5V APA102 60leds/m LED strip, controlled by a Raspberry Pi. In order to power the LED strip, I bought a PSU rated 10A 5V, which in reality ...
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votes
1answer
56 views

Noise in simple BC547-Raspberry Pi GPIO doorbell?

I've connected a Raspberry Pi to my Friedland "Ding Dong" doorbell. The doorbell has two (apparently unused) terminals, over which there seems to be a stable voltage of 1 mV when the button is not ...
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0answers
57 views

Raspberry pi B+ internal power supply ckt?

I have just started to study about raspberry pi B+ (data sheet) Can somebody explain the working of power supply circuit (individual component wise) starting from pg 14. How and why it is ...
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2answers
62 views

Connecting a Raspberry Pi to a 220V switch

I have a switch that works at 220-230V AC and I'd like to link it to my Raspberry Pi and I want to know what I have to do from an electrical point of view. So my switch, when switched on, places 220V ...
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vote
3answers
56 views

What type of diode?

I'm using raspberry pi 2 for driving a motor,, using motor driver L293d, through gpio pins of RPI. My question is,if some short circuit happens between input and output of L293d,,12v goes to RPI,and ...
3
votes
2answers
119 views

Raspberry PI audio over Cat5e wired ancient hotel intercom

My question is can I (and how might I with minimal insanity) connect the audio output of a Raspberry PI (and/or other USB audio outputs) via say some 10-30m of Cat5 cable to some 10 or so pretty ...
0
votes
1answer
50 views

Reversing a small synchronous gearmotor

it's been difficult to find the answer to this problem I have. My project is based on home automation. I need to control the direction of the rotation and if possible the torque of an AC synchronous ...
0
votes
2answers
65 views

Can a 6V rechargeable battery be charged to 5V after complete discharge?

I live in a area where there is power cut. I have to power a Raspberry Pi (a device rated as 5V and 300-700mA) through micro USB continuously. So I decided to make my own mini inverter. Now I have a ...
1
vote
1answer
86 views

315 MHz Reciever/Transmitter Raspberry Pi

I bought a receiver and transmitter (I can't find the link, but it says FS1000A and LR1 315.00 on it). I also have a set of remote controlled wall outlets that operate on 315MHz according to the FCC ...
0
votes
3answers
75 views

Computer PSU 5v Output direct with Raspberry Pi USB

I'm using an old power supply unit from an old computer (2011 HIPRO) to power my Raspberry Pi 2 Model B V1.1 (2014). I have measured the voltage across the terminals of the 5v output (Red and Black) ...
1
vote
1answer
85 views

Multiple Broken Relays — What About My Circuit Is Making Them Fail?

I recently purchased one of these relay boards ... to use along with my Raspberry Pi to switch an AC outlet on/off to control a fountain pump. Since the relay board requires 5V for the control ...
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votes
1answer
55 views

Raspberry Pi controlled lamp using a relay & mains procedure

I am trying to turn on and off a lamp I have at home using a relay controlled by my Raspberry Pi. Here are the exact parts I will be using: Raspberry Pi B+ My lamp: My relays: Potential ...
2
votes
0answers
64 views

Raspberry Pi Zero - Male pad or connector for underside contact pads?

I got an idea after reading this hackaday article http://hackaday.com/2015/11/28/first-raspberry-pi-zero-hack-piggy-back-wifi/ that I could make a daughter board to sit under the Pi Zero and have ...
0
votes
0answers
17 views

Raspberry Pi LCD HDMI driver

I've bought an lcd screen with driver online, however it only displays the VGA input. When I Google the driver board, it is always connected with another board to control the input, however this board ...
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votes
0answers
59 views

Problem with coil current on NEmA 17 stepper motor and chinese A4988 driver

Since my driver for CNC/3D printer blew up (my fault), I decided to make one on my own. I am using chinese made NEMA17 stepper motors with max current of 2A@2.2 V and 1.1 ohm coil resistance. I have ...
0
votes
2answers
74 views

Will this raspberry pi circuit work?

simulate this circuit – Schematic created using CircuitLab Will this circuit work with the raspberry pi and will the rpi be safe? I want the motor to turn on when GPIO_2 is set high. It ...
4
votes
3answers
129 views

RxTx communication with multiple slaves using a RaspberryPi

I am a programmer trying to build a circuit with limited EE knowledge. With so many options(at least being new to this), just want to make sure I am going down the right path. What I am trying to ...
4
votes
2answers
89 views

How to stop Car Alternator audio noise / buzz?

I connected a Raspberry Pi 2 in the car to add OSMC media player capabilities. However, there seems to be a buzz / hum of background noise in the audio. The noise is correlated to the engine speed so ...
0
votes
2answers
56 views

Replace potentiometer in Dart Controls 90vdc motor controller with raspberry pi

My existing setup: Rae Corporation gear motor (90vdc, 4.5amps, 120rpm, 150 in/lb torque, Part number 6040042). I can't find a datasheet, but it looks a lot like this Dart Controls motor controller ...