Questions tagged [hardware]

Questions relating to the physical components that the Raspberry Pi consists of.

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Raspberry Pi 3b+ not booting

I got a raspberry pi 3 b+ for Christmas and yesterday whilst installing a Pi Hat's Software (Rasp.io Duino) it just flat out died after showing that there was an under-voltage, even though I was using ...
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5answers
130k views

What is the maximum / minimum operational temperature?

As per the title, what are the maximum and minimum operational temperature ratings of the Pi before it stops reliably working? Could this also depend on the SD card in use?
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2k views

Rpi freezes every now and then, how to fix it with a watchdog?

I'm building a system with a raspberry pi located in a very remote area connected to internet with an internet stick. The tests are promising so far but the pi freezes every here and then and I'm not ...
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4answers
54k views

What are the RUN pin holes on Raspberry Pi 2?

Inbetween the Display port, and the Activity LED on my Raspbery Pi 2, There are 2 holes boxed off, labled with: "Run". What are those pins? What do they do? Is it a reset?
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4answers
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How do I attach a GPS receiver?

I would like to hookup a GPS receiver to my Pi so that I can: Get my geographical position Synchronise clock when not connected to network What are my options? Will any hardware supported by gpsd ...
22
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3answers
78k views

Control Hardware PWM frequency

I'm using the hardware PWM output with wiringpi. It provides the function pwmSetClock that should make it possible to change the frequency. (https://projects.drogon.net/raspberry-pi/wiringpi/functions/...
69
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7answers
54k views

How do I control the system LEDs using my software?

There are 5 LEDs on the RPi: OK, PWR, FDX, LNK, 10M. I'd like to know if it's possible to control any of these from software i.e. turn them on, or change intensity (or even change colour gasp). And ...
10
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2answers
24k views

Can the Pi Emulate an HID device with via USB? [duplicate]

Does the Raspberry Pi model B+ have the capabilities of acting as a Human Interface Device (HID) with no extra hardware (other than a USB to USB cable)? I saw this question but it was about ...
65
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5answers
75k views

How do I hard reset a Raspberry Pi?

How do I hard reset a Raspberry Pi? Obviously you can power cycle, but is there a more subtle way, like a reset pin? It would be very useful to connect a watchdog in case the Raspberry Pi crashes (...
14
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4answers
10k views

Turning on and off a 3G (or any USB) port?

I have a project which will require using a Raspberry Pi in a low power environment, but it will also require a 3G connection. I have not done any tests, yet, but I am under the assumption (and ...
6
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4answers
7k views

How can I control the red LED again

I just acquired the latest Pi-3. In the Pi B+ and Pi 2 it was possible to access both the red and green LED through /sys/class/leds/led0 and /sys/class/leds/led1. After setting up the Pi 3, I have ...
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Why is the CPU sometimes referred to as BCM2708, sometimes BCM2835?

I've seen the System on Chip of Raspberry Pi referred to usually as "BCM2835" (e.g. on Wikipedia), but sometimes as "BCM2708" (e.g. sources for Linux SPI driver are in bcm2708.c, or in comments to my ...
26
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4answers
25k views

Why is my SD card slow?

My SD card seems to be running slow. I have an ADATA 16 GB SDHC Class 10 card. I checked the compatibility list which lists a card with similar specifications, and it states that it is "working". Even ...
37
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1answer
268k views

Virtual keyboard activation

I bought a raspberry pi2 and 7 inch waveshare touchscreen. The SD card came along with the system already flashed. It turns on and everything works, but how do I activate the virtual keyboard. Do I ...
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2answers
11k views

Editing Serial Number

On the official raspberrypi.org forum, "Dom" - a moderator wrote: I've fudged my board to have your serial number How do I edit the serial number of a Raspberry Pi?
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5answers
13k views

How can I turn an GPIO to its alternate function?

I want to use the altenate function of GPIO 4 namely the GPCLK0 function. How can one set a GPIO to its alternate function? Many alternate functions are summarized here: elinux-wiki The best would ...
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2answers
34k views

Using single 5V relay (jqc-3ff-s-z) - safety advice required

Above is relay I'm using and everything works as expected using diagram below. I will add 1n4148 diode on IN line for safety and will connect VCC to power supply before Pi. Can I use ground (GND) ...
3
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3answers
5k views

I am getting ghosting/bouncing on my digital input

I am meassuring data pulses from my electrical meter, giving me one pulse per Watt used. I have 4 electrical meters connected to my Raspberry Pi model B. I have connected them directly like this (no ...
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5answers
7k views

Disabling USB ports

I'm using the RPI to create a program, but I need to disable the USB ports so that the end user cannot plug in a keyboard or mouse and mess with the device. Is this possible, and if so how is it done?...
3
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3answers
546 views

How can a 12VDC power supply stepped down to 5VDC for Rpi?

Good day, I have a Raspberry Pi Zero W that I would like to deploy onto a tower that is supplied with 12VDC power from a photovoltaic solar panel. I'm currently looking at powering the Pi Zero W ...
1
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0answers
163 views

How can Rpi python control MCP3008 ADC?

I've been messing with raspberry pi, and I am learning about interfacing it with analog devices. I am using the MCP3008 for that and following this tutorial here. I wired it up like the pictures below:...
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3answers
384 views

Rpi Reading MCP3008 10 bit ADC Result Problem

I want to measure some battery voltage in a range 0V-4.2V with MCP3008(VDD=VREF=3.3V). I used a voltage divider with R1=2.7MOhm and R2=8.2MOhm, but it didn't return correct value, I used resistors ...
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5answers
71k views

Does the Raspberry Pi need a cooling system?

Searching on Newegg for "raspberry pi", the results included many heatsinks and as well as a few other types of cooling systems, yet these items do not seem to appear when looking through the stores ...
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3answers
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How can I record audio using a microphone?

Just came across this question while trying to connect a webcam. If the webcam encapsulated audio that is fine. But what if I want to attach a microphone in another location / locations. Question: ...
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4answers
15k views

How can I use more GPIO ports on the Raspberry Pi?

I am currently planning a project for a course at school which involves using the Raspberry Pi - however I'm worried that I will not have enough GPIO connectors for the inputs and outputs that I will ...
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5answers
36k views

What SPI frequencies does Raspberry Pi support?

What SPI frequencies does Raspberry Pi support? Additionally: Are they all supported by the bootc.net SPI driver? Are there any additinal things I should be cautious about when trying to ...
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5answers
23k views

How to install Waveshare SpotPear 4 inch LCD in RaspberryPI 2?

I've bought 4inch IPS LCD from WaveShare but cannot get it run on newest Raspberry PI 2. The original DVD comes with image which isn't compatible with RPI 2. Tried to follow this manual but without ...
26
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8answers
28k views

What are the possible OUIs for the Ethernet MAC address?

I'm setting up a computer lab in which many Raspberry Pis are going to acquire IP addresses via DHCP. I'd like to have the DHCP server to differentiate between Raspberry Pis and other clients. What ...
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4answers
12k views

Is a super computer built from many RPis really practical or just a novelty?

This question is inspired by this article. Currently I spend a lot of time in R to analyze data. Some of the scripts I run in R could benefit from parallel computing in order to save time. Let's ...
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2answers
7k views

Is it possible to record and stream audio from a raspberry pi to a PC?

I'm trying to come up with a project and I want to know how feasible the following is: I want to be able to stream audio from a raspberry pi to a PC. This includes: Connecting a mic to the pi ...
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2answers
12k views

Pi Zero Video out header

I'm still waiting to sort getting a Pi Zero, but a thought has just occured to me. The Pi Zero has 4 pins which are AFAIK something to do with video: So I have two questions: What is the pinout for ...
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3answers
11k views

How fast is GPIO+DMA? Multi I2S input

I want to connect multiple I2S ADCs to RaspberryPi and record multi-channel audio. I calculated that it requires copying GPIO input port to RAM at 3072kHz (or every 0.33µs). I want to do it using DMA. ...
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3answers
49k views

Why Isn't My Ethernet Working?

I just got Pi Model B. I downloaded Wheezy on SD card and plugged in all of my cords. Everything works fine except the Ethernet port. The LINK LED flickers for a second while booting up, but then it ...
12
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2answers
954 views

Should GPIO pins 13 and 14 be soldered together?

I just bought a new Model A+ board, and noticed that the GPIO pins 13 and 14 (board pins 21 and 23) are soldered together on the backside. This was not the case with my previous A+ board: see the two ...
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1answer
2k views

WiFi not working on fresh install

I have had my Raspberry Pi for a few years now and today I went to do a fresh reinstall of Raspbian. I downloaded v2.4.4 of NOOBs and used that to install Raspbian. Everything installs nicely except ...
2
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1answer
766 views

HDD 2.5 with Raspberry Pi 3 Model b

I'm new on Raspberry world and bought this components: Raspberry Pi 3 Model B Power Adapter 5V 2.5A HDD 2.5 My question is: Is this enough to connect the HDD to Raspberry Pi, or must I buy a HUB? ...
35
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4answers
28k views

What is the highest performing hardware configuration?

I know that exact benchmark numbers will vary between manufacturers, but in general if you only consider higher end flash drives, SD cards, and USB HDDs and your Raspberry Pi is connected to a network ...
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3answers
56k views

What size screws does the Raspberry Pi board use?

On the model B+ there are four screws that can be used to attach your device either to a base or firmly inside of a case or other enclosure. What is the size of these screws? That is, if you are ...
13
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3answers
10k views

Maximum current on each GPIO pin for Raspberry Pi 3 Model B

Anyone knows what's the maximum input/output current for the individual GPIO pins? Perfectly fine if someone is able to point me to the Broadcom BCM2837 datasheet, which I for some reason, cannot ...
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3answers
2k views

How can I identify from command line which board revision I have?

I just ran cat /proc/cpuinfo on my board. I get "Revision : 1000002". I've failed to find any mention of which version of the board this is. Any help?
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5answers
6k views

What is an easy way to electromagnetically shield a Pi?

My friend and I are working on a Civil War telegraph project, and we incorporated a Pi into the project, for reading and displaying the received code from the key. My friend created a period correct ...
14
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2answers
2k views

Where can I find the schematics and supporting design documents for the hardware?

I've tried to search for this online, but other than a few posts on the Raspberry Pi blog, I can't find an official source of the design documentation for the hardware. It was my understanding that ...
7
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1answer
2k views

How to precisely capture the arrival time of an input edge?

On the Arduino / ATmega328p, the 16-bit Timer/PWM modules have a input capture unit that allows the precise time of arrival for an input edge to be recorded even if the processor is busy when the ...
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5answers
11k views

Raspberry Pi 3 Power supply - chargers for mobile phone

I ordered new Raspberry Pi 3 for testing Win 10 IoT. Have a question about power supply. I have two chargers for mobile phone and which one do you recommend to use: Sony Xperia Z2 = 5v 1500mA Galaxy ...
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3answers
7k views

Raspberry Pi 3 USB booting

According to official bootmodes documentation, the process of booting Raspberry Pi 3 off USB takes two seconds to wait for mass storage devices (MSD) to enumerate. That article also says it is also ...
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0answers
158 views

How to make an external monitor working while lcd display is connected? [duplicate]

I have a touchscreen lcd display connected to Raspberry PI 2. Everything works fine: os is booting etc. If I connect an external monitor via hdmi, I get some output on the monitor and some output ...
5
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1answer
5k views

Powering Raspberry PI With Broken Micro USB Connector

The Micro-USB port has been brutally ripped off from the PCB on my Raspberry Pi along with traces connecting it. I know that I can power the device from GPIO 5V and GND, but there will be no ...
4
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4answers
4k views

Logic converter for relay module or extra resistors and transistors?

I would like to use a 8 channel relay of SainSmart for house automation: http://www.sainsmart.com/8-channel-dc-5v-relay-module-for-arduino-pic-arm-dsp-avr-msp430-ttl-logic.html This Relay module ...
3
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3answers
1k views

GPIO input and output levels

I have some basic questions, sorry, I have'nt found this. What are output levels of GPIO (Raspberry Pi) I mean the voltage ranges of low and high for input/output What is the maximum current that ...
2
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5answers
766 views

Can I Use this Relay Board with pi?

Can I use this Relay Board with the Pi ? Because This board doesn't have Opto-Coupler..can i drive it from 3.3v...will It Cause any Issue for Pi