Questions tagged [raspberry-pi]

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. There have been several generations of the device with improved performance, more memory, and more connectivity. This tag should be used for electrical engineering questions that involve the use of a Raspberry Pi. For questions about the Raspberry Pi itself see the raspberrypi.stackexchange.com Raspberry Pi specific forum.

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216 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 ...
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2answers
13k 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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3answers
2k views

Breadboarding a Raspberry Pi

Ok, long time reader first time asker on this parcticulair stack-exchange. I am rather new to electronics, I've done some simple projects like Blinking Lights, alarms that go on when its dark and a ...
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4answers
1k views

Using a digital potentiometer in a voltage divider

I'm using an MCP3008 ADC and an MCP4131-103 (10k) digital potentiometer to try and create a sort of "adjustable voltage divider." For the project, the resistance I'm measuring will vary, and I hoped ...
5
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2answers
480 views

Use ATX power source to power Raspberry Pi

I'm setting up several Raspberry Pi's and Arduinos connected together, and I'm looking for a way to power them. Would it be possible to adapt an ATX stock power source with female USB plugs using the ...
4
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1answer
1k views

Choosing transistor for a raspberry pi switch

I'm trying to design a circuit that will control the power to a raspberry pi with a button. The basic usage is: first button press-> rasp powers up. second button press-> rasp continues with power ...
3
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3answers
1k views

Ground loop when measuring in process pH

I have been experiencing a very difficult to solve ground loop problem with my pH measuring system. My basic setup is a standard pH electrode running through an op-amp to an ADC which communicates ...
3
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2answers
534 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 ...
3
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1answer
1k views

Managing I2C address conflicts with multiple MCP23017 on the same bus

I'm using a Raspberry Pi with the I2C master and I successfully wired 8 different MCP23017 chips, each with their respective addresses by setting the last 3 bits of their 7 bit addresses. They are all ...
3
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2answers
208 views

Different ways to detect seals? [closed]

I would like to build an underwater mammal detector to take videos of seals when they get in and out of their cave (the entrance of their cave is underwater). It will be a waterproof sealed box with ...
2
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1answer
871 views

How to start implementing your own computer? [closed]

The question As a first step I need to select a circuit board, CPU & RAM/ROM chips and I/O connectors. How do I select a board that can interconnect all these components? Perhaps you could give ...
2
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3answers
282 views

How can I seamlessly switch power supplies?

Quick question, I am not very good with my electrical circuit terminology so I'm not sure what to call what I'm trying to do. When I try to Google "How to switch power supplies" I got inundated with ...
2
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2answers
2k views

External power for Raspberry Pi USB device

The Raspberry Pi's USB ports can only supply about 100ma of 5V current; this comes directly off the 5V input power to the board. The usual solution is to use a powered hub to support devices that ...
2
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2answers
171 views

How do I build a system for localizing sound source? [closed]

In my apartement I have the problem that when I am in my bedroom I can hear the neighbours in their bedroom exactly above me talking. Luckily I can not hear what they are saying but still pretty ...
2
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2answers
138 views

Doorbell Press for MCU

Situation I'm looking to add Raspberry Pi 3 near my door and detect when the doorbell is pressed. But I don't want it to change the operation of the chime (if Pi is off/unplugged, the chime should ...
2
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2answers
453 views

What should I use from given options to power a raspberry pi?

I have a system which consists of 2 12V DC motors(0.65 A on max load) and 1 RPi 2 model B. I want this system to be plug free. I have Li-Ion batteries to power up motors. I use a L298N module to drive ...
2
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1answer
795 views

How to control PcDuino pins from Java?

When I had Raspberry Pi I used to control the GPIO (pins) from a Java application using the Pi4J library. Is there any library to control the GPIO (pins) on the PcDuino using the Java language?
2
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1answer
1k views

Power consumption and frequency

I am making a small, mobile device with the Raspberry Pi that depends on batteries, so power consumption is an issue. I have scaled the "arm_freq_min" (unsure if clock or instruction cycle frequency) ...
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2answers
816 views

Connecting 5V device to 3.3V input through a single resistor

Hi I've got a Raspberry Pi, that's 3.3V device, and a Nextion display, which is a 5V device. They are talking over UART. Obviously RPi's UART RXD link can be damaged if connected directly to the ...
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1answer
1k 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 ...
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2answers
502 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 ...
1
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1answer
3k views

Coordinator + Repeater Xbee + End device configuration

I am trying to work on a Xbee based solution for transferring data from with in a specified area.I am using Xbee865LP for the same project. Now what i want to implement is Make one device act as ...
1
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1answer
56 views

control 3 status LEDs with 2 PCs

I'd like to control 3 status LEDs with two different PCs: an OrangePI-PC, using the GPIO pins as power source (same pinout of a RPi2); regular desktop PC, using the parallel port as power source. ...
1
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1answer
349 views

Add 3.5mm Jack to Raspberry Pi for TTL Signal with 5V

I am a 100% software guy, so i wanted to confirm that my little project is gonna work before i fry everything. I am trying to create a controller for my (quiet old) Onkyo reciever. I am trying to do ...
0
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1answer
386 views

Raspberry Pi- SPI with Hi-Res Bipolar ADC Chip (LTC1867). Wrong values being read

this is a follow up to my previous question "How to measure bipolar analog signal accurately (to 1mV) on raspberry pi" . I can't post more than 2 links yet but please have a look for some more ...
0
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1answer
231 views

TUSB2046B hub with raspberry pi zero

I'm using a TUSB2046B hub connected to a raspberry pi zero. The hub circuit looks like this: There appears to be a 12MHz sine wave coming from the crystal (as counted by my scope) and 3.3V on the ...
0
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2answers
931 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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2answers
209 views

Resistor and voltage of a circuit

I'm a beginner in electronics and I was studying when I had a question, how to calculate the voltage after passing by a resistor. Ex: there is a circuit of 10mA with a 5V voltage, what is the voltage ...
0
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1answer
208 views

Ethernet to SPI converter Differential line importance?

I hope someone can shed some light in this, I am laying out a Ethernet to PI zero HAT and will be using the enc28j60 controller from microchip. People have reported getting 2.8mbps up and down speed ...
0
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1answer
1k 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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3answers
289 views

Can I drive a BLDC driver with this diagram?

I'm a programmer and I've only started messing with hardware half a year ago, mainly with the Raspberry Pi. I now want to drive a brushless DC motor using my Raspberry pi. To do this, I've bought this ...
0
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2answers
928 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 end ...
0
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2answers
156 views

Unable to activate an Nmosfet gate with raspberry pi

So I've been trying to control a motor using a MOSFET transistor, where the gate is controlled by a raspberry pi. My circuit is wired as follow: The diodes represent the raspberry pi ground and gpio ...
0
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1answer
603 views

Calculate base resistor of PNP transistor in switching circuit with variable resistance

I would like to read analog input on my Raspberry Pi using various resistive sensors I represent in the schematic below as potentiometers (R5 ad R7). I need to be able to switch the circuits on and ...
0
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2answers
137 views

Read state from LED in another circuit

For a current project, I have to read the state of an LED in another circuit with a Raspberry Pi. My current schematic is this: simulate this circuit – Schematic created using CircuitLab ...
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2answers
120 views

Powering up raspberry pi 3 b+ with one 11.1V 3S 2200mAH 30C Rechargeable LiPo Battery

I wanted to power up my raspberry pi with the only lipo battery I have which is a 11.1V 3S 2200mAH 30C Rechargeable LiPo Battery. I done some research, and most of them used a voltage regulator to ...
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3answers
82 views

Checking how many inputs (reed switches) are active using minimal GPIO pins [duplicate]

I've been a programmer, for a while, but I am new to the hardware aspect of things so I apologize for my lack of knowledge. Just for a fun project to try to get better with hardware, I've decided to ...
0
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3answers
350 views

How to mount four 6-wire 10V load cells on Arduino or Raspberry Pi?

I want to connect four 6-wire load cells (Tedea Huntleigh Compression & Tension Load Cell 300kg, 15V dc, IP67, product page and datasheet) into an Arduino or Raspberry Pi and get four independent ...
0
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2answers
324 views

Driving a 6V relay from an 3.3v GIO pin of Raspberry PI3 [duplicate]

I want to drive this 6v relay (RT314F06) from a 3.3v output gate of an GIO pin of a R-PI3. --edit-- There is already this answer on SO, but it is incomplete in the way that it does not tell which ...
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2answers
356 views

Powering a rpi and accessory of a 9v battery [closed]

We are trying to use a raspberry pi to record the current going through a dc circuit. The circuit we are trying to measure the current in is powered by a car battery. We have no idea how to record the ...

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