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

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Raspberry Pi as a POS?

How practical is it to use a raspberry pi for a POS system? I'm in a small country where bring in a large quantity of POS system will cost too much. Was wondering if i can replace the current ...
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1answer
20 views

RaspberryPi.Net Libary LCD Display

So my problem is, that we want to control a LCD (HD44780) Display with our Raspberry Pi Model B V1.1. The Libary seems to have a support for it. But there only seems to be one example in the whole web....
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1answer
18 views

Why is my right stepper motor stuttering?

Raspberry Pi : 2 Model B v1.1 This is the circuit I am trying to implement : http://www.homofaciens.de/bilder/technik/v-plotter_012.htm This is the code : https://ideone.com/vDPtsa I have made the ...
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0answers
18 views

How to drive a stepper motor using L298N Dual H Bridge Motor and Raspberry Pi?

This is the circuit I am trying to achieve : http://www.homofaciens.de/bilder/technik/v-plotter_012.htm Stepper Motor : 17HA0403-32N My stepper motors are not reacting at all. Is there any way to ...
1
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1answer
55 views

Soldering question

Beginner question. I have my circuit working, now I want to wrap up the pi and its cables in a clean fashion. For the external 5V charger I am using for the LED screen I can branch out, cut the pi ...
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2answers
106 views

Board sign from LED strips

I'm trying to build a sign board made of LED strips, just like this I found a ton of examples on controlling a single strip and also examples using the adafruit premade led boards (16x32), but no ...
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1answer
37 views

FS80H USB Fingerprint Scanner in Pi 3

I have a USB fingerprint scanner of brand Futronic (model FS80H). I am trying to get it working with Raspberry PI. On their website mention that on linux it doesn't use any kernel mode driver, but ...
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1answer
50 views

What is the best connection for Raspberry pi3 model to PC/laptop?

I heard we can connect Raspberry pi to laptop or PC Or Tv through LAN(Coaxial cable) and UART(serial to USB converter). Which one is gives better performance,speed(data rate). Instead of these two,is ...
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1answer
211 views

Raspberry Pi 3: microSD card vs hard drive

In my bachelor's thesis I compared the speed performance of a hard drive connected via USB adapter with a microSD card. I was challenged to answer the question "Why is the difference in speed drives ...
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6answers
114 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 ...
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1answer
43 views

mpg2 license on RPi3

Do you need to purchase a mpg2 license for the RPi3? I thought I heard somewhere that it was included in they unit purchase price.
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1answer
54 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? ...
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0answers
60 views

Is my Pi dead after plugging in four USB hard drives, if the power and ACT LEDs still light up?

My Raspberry Pi 2 B (rev a01041) has been working great for ages. I usually have two hard drives plugged into it. Yesterday, I plugged in another one. Today I plugged in a fourth. Immediately, the Pi ...
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1answer
40 views

Raspberry PI multiple high frequency pinout

I'm controlling 4 stepper motors with my raspberry PI, and I need to step them in a control loop cycling at a specified rate as low as once every 40 microseconds. The motors won't always be stepped ...
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2answers
109 views

LED Toggle Switch with GPIO

I have a raspberry Pi 3, and am looking to use a 3 wire automotive LED switch (think missile switch or lighted rocker switch) to trigger a GPIO pin, and power the LED when in the on position. If I ...
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2answers
96 views

RPi 3 B - On-Board wifi not present

I have this Raspberry Pi 3 B, and it seems that the on-board wi-fi is not showing at all. I have downloaded and flashed a fresh image of raspbian, but that did not help. If I use an external USB wifi ...
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2answers
37 views

Media center and web server at same time?

I'm thinking of getting the raspberry pi 3. I'd like to use it as a media center and in the future possibly set it up as a server to host my own website. Can the raspberry pi do it all at the same ...
0
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0answers
35 views

Raspberry Pi controlling 5v Fan using Transistor [duplicate]

I have a project that requires a fan to keep the Pi cool due to the terrible ventilation. It's a 5v 0.6w fan. So I thought I could use this wiring here: Instead of 12v it would be 5 from a UBEC, and ...
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1answer
36 views

Raspberry Pi Zero as Hardware Bypass

My girlfriend has been working on a project for a high level university CS class. The requirements are that input is take from a gaming controller, steering wheel, et al, and sent simultaneously to a ...
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0answers
20 views

Shutdown Button for Raspberry pi [duplicate]

I am using the RP3 as a NAS (OpenMediaVault installation) and would like a button that I can hold down to trigger a controlled shutdown. I had a NAS that I could shut down like that, but miss this ...
1
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1answer
50 views

How to use PI4J with a brushless motor?

I have a Raspberry Pi 2 model B. I would like to be able to control a motor with a regulator and PI4J. I put the black cable to a ground pin and the PWM pin to pin 26. I've worked with servos before, ...
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2answers
520 views

hcitool scan says No such device

Using Raspberry Pi 3, Linux test 4.4.9-v7+ #884 SMP Fri May 6 17:28:59 BST 2016 armv7l GNU/Linux root@raspberry:/home/user# hcitool scan Device is not available: No such device What can be the ...
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2answers
60 views

Why raspberry has 5V output rail if gpio only works with 3.3V?

I have recently read that using Raspberry GPIO with 5V is risky as it may damage the GPIO pins. I did used my Raspberry with 5V without knowing this fact and I was lucky that sensors I have used were ...
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0answers
32 views

What component do I need to play a sound clip over GPIO?

I'm looking for a way to play a sound clip (wav/mp3/ogg) using the GPIO and some small component(s) (i.e. not ordinary speakers). The sound clips contain human speech, so quality need not be great. I'...
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2answers
114 views

How do I detect the type of camera installed?

I need to know how to remotely detect whether an 8mp or a 5mp camera module is connected to the rpi for implementation in an embedded project. Any help?
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5answers
3k views

Is it possible to add RAM to Raspberry Pi?

Is it possible to add RAM to a Raspberry Pi?
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0answers
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Can i run multiple Raspberry Pis together to build a workstation? [duplicate]

I have taken interest to Raspberry Pis recently and want to start a project. I have not yet used or purchased a Pi yet so i have a couple questions before i do. Is it possible to connect multiple Pis ...
0
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1answer
74 views

Write interrupt data into a Raspberry pi Register on C?

I'm trying to read interrupts and detect direction of interrupts from an encoder using a raspberry pi , it is USdigital Brand "H6BM-1000-500-IE-S-H" , it has 1000 signals per revolution , the thing ...
0
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1answer
65 views

Fastest Hardware Interrupt software?

I'm wiring my Raspberry pi to a USdigital encoder , especifically this model "H6BM-1000-500-IE-S-H" , it has 1000 signals per revolution , I've followed the tutorial on http://raspi.tv/2013/how-...
3
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1answer
84 views

Connecting a 24v appliance(solenoid) to Raspberry Pi

I am trying to do an Internet of Things project with the help of a Raspberry Pi. While most of the project is complete, there is one small thing I am stuck at. I need to connect a solenoid valve to ...
0
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1answer
68 views

20x4 LCD Shield for Pi?

I'm attempting to build a user interface that provides minimal access to only a few crucial configuration options (network config, host name, reset defaults, etc). I have a SainSmart 20x4 LCD that I'...
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1answer
80 views

Is there a drone kit that connects to a raspberry pi?

I am trying to build a drone with any amount of propellers(quadcopter,single,double,octo,etc.). I am not trying to do so much work of programming it, but I do want to assemble it. I'm looking for ...
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2answers
58 views

Detect milisecond on hardware

I'm trying to start a project as described: When someone presses a button I need to start a stopwatch. Then, when someone presses another button (hardware button), I detect the elapsed time from the ...
5
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1answer
48 views

Is there way get the GPU-load average per second?

I am interested to get the GPU-load average over, for example, an interval of one second. Alas, I was unable to find a direct way to get this information with the current API or tools ( vcgdb or ...
4
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1answer
63 views

Looking for lab test results for the PI's random number generator

I'd like to host my electronic raffle system on a Pi 2 or Pi 3. However, in some jurisdictions, the random number generator must be certified by an independent testing lab. Have you ever seen any ...
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1answer
67 views

Micro SD card slot on Pi 2

I've just received a Raspberry Pi 2 and tried to insert the micro SD card, but for some reason the mechanism doesn't appear to be working correctly. You hear a click and can observe the card ...
0
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1answer
20 views

Multi Display configured to cube like format?

I was wondering if there was any program or way for a pi/alternative SBC to output to several displays 4-6 as a single canvas. The wrinkle is that this single canvas needs to wrap around as if each ...
0
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1answer
72 views

Safe to solder directly onto Pi GPIO pins?

I just purchased an Adafruit 2.2" PiTFT screen with the intent of fitting it inside an official Raspberry Pi case. If fits pretty well just resting directly onto the GPIO pins (without the supplied ...
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5answers
687 views

What can Raspberry Pi do that my Linux desktop can't

I have been told by some friends that Raspberry Pi computer is the "next best thing". I am trying to understand what it is and what it can do before I jump on the bandwagon. After doing some ...
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1answer
50 views

sense hat sample “snake” returns “event device not found” error

My "sense hat" sits ontop of a raspberry pi 3. I've completed the installation instructions found at https://www.raspberrypi.org/documentation/hardware/sense-hat/ lexu:~> sudo apt-get update lexu:~...
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1answer
106 views

Solder USB to Raspberry Pi 2

Alright guys, I have a question in how to solder an additional USB port to the board. I have an old security camera system dvr that I've taken apart and gutted to install my raspberry pi and tb hard ...
0
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1answer
57 views

Where can I get FULL mechanical drawings of Pis?

Anyone know where I can get the FULL mechanical drawings of the Pis? I have found many drawings - but the cover only the top PCB perspective - i.e. the do not cover left/right/front/back perspectives,...
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0answers
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Raspberry Pi Nokia5110 not working after first use

So, I just connected my Nokia5110 screen to my raspberry2 following these instructions, and everything went great. The only problem is that my screen was upside down. I shutdown the machine and change ...
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3answers
78 views

Can I control a DC 3-6v Gear Motor without any driver?

I was wondering if I can control a DC 3-6v Gear Motor without any thing but my Raspberry Pi. I have provided an image of what I have done and it does not seem to work but when I plug the positive side ...
4
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1answer
643 views

Raspberry Pi Business use VS Personal use

I am new with Raspberry Pi... Since I wanted to buy one piece of raspberry pi, on the website I found (RS online) that there are 2 possibilities: Buy your RPi 3 model for business use Buy your RPi 3 ...
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1answer
217 views

Where can I find Raspberry pi 3 complete data sheet

I heard Raspberrypi is an open source project. Where can I get Raspberry pi 3's complete documentation of hardware design and data sheet? I bought a RPI3 and I want to look whether the Micro USB port'...
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0answers
66 views

File transfer failing (SSH and Samba)

I currently have a Pi 2 with a 2.1 A power supply, a powered USB hub (separate mains supply), and plugged into that, is a powered USB2 HDD (HDD has its own mains supply). The entire HDD is shared via ...
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0answers
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What refresh rate is used on the 7" DPI panel (with the closed driver)?

In debugging the open source driver's DPI panel support, I noticed that I was choosing a weird clock rate for the 7" DPI panel (working out to 38.7Hz refresh rate, when I meant to get 60Hz). Looking ...
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0answers
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Power On/Off and Regulator Schematic Design

For my final year project, I'm designing an add-on PCB circuit that connects to the Raspberry Pi A+ by means of jumper wires as opposed to the GPIO directly. This is due to size restrictions on the ...
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2answers
259 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 ...