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

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1answer
13 views

Raspberry PI digital signage solution

This is probably not the first digital signage discussion but I think my requirements are a bit different. I'm looking to set up a Raspberry Pi to connect to a network via Wifi and a TV via HDMI, on ...
1
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0answers
13 views

Raspbian /sys/bus/w1/devices/ is empty when having multiple 1-wire DS18B20 temperature sensors

I have a RasPi model B rev. 2.0 and two DS18B20 1-wire temperature sensors and they are working individually fine. I know I should be able to connect multiple 1-wire sensors in parallel but I can't ...
0
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1answer
18 views

Building a two DC motor robot cart with rpi

I want to build a Robot which runs on Two DC motors have cart like structure , I want to control it using PWM. what is best way to do it directly from rpi without using Arduino or kits or modules but ...
2
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2answers
77 views

How much current does the Raspberry Pi can handle?

I got a Raspberry Pi Model B+ for the first time and I have been searching in my house phone chargers that I can use. In the manual in the package it stated that the maximum current is 1500-2000mA and ...
2
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3answers
49 views

Default duty cycle of hardware PWM using wiring-pi

I spent quite some time, but I wasn't able to find the answer (and found other interesting sources like changing pwm frequency 1 and changing the frequency 2), and I lack the equipment to find out by ...
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1answer
26 views

How many GND does a RasPi model B rev.2 P1 header have?

I see a lot of conflicting documentation on how many GND pins are available on model B rev. 2.0. I have hardware revision "000e" and there are a lot of DNC (Do Not Connect) pins. ...
2
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2answers
60 views

Proper hardware debouncing my interrupt driven digital electrical meter input?

This is a child of my first problem, I am getting ghosting/bouncing on my digital input, but this question is more hardware related and specific to my problem. I have a RasPi model B. I have read ...
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1answer
54 views

raspberry pi os programming

My goal is to learn more about operating system concepts by poking around some simpler OS's and possibly writing one from scratch. The Raspberry Pi seems attractive as an entry level system to ...
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0answers
22 views

Raspberry Pi in 24/7/365 production [duplicate]

Would you advice to use Raspberry Pi as a server for an advertising display system to manage 150 LCD screens in 24/7/365 mode? Thanks in advance,
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2answers
93 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 ...
1
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1answer
43 views

Simple solenoid valve control troubleshooting

I should mention that I am trained in biochemistry with a basic college-level physics background, but with no background in DIY electronics. I'm trying to make my Raspberry Pi control a simple valve. ...
2
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4answers
130 views

Can the pi power this 2.5" drive without a usb hub?

I want to use my PI model B as a NAS, but I'd like to avoid using a usb-hub. I have a 2.5" western digital 1tb usb drive (this one), and a 2A power supply for the pi that I'm planning on using with ...
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0answers
35 views

Raspberry Pi Production Cost (Educated Guess)?

I am working on a project and need to know the production cost for a Raspberry Pi (any model). I understand that data regarding this has not been released officially and have seen the following quote ...
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0answers
110 views

Running RPi on Solar Panel and battery

I’m quite new in electronic projects and so my basics are quite limited. I've been reading a lot regarding this topic (refer to the title) and I’m currently planning to buy the suitable Solar Panel, ...
2
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1answer
66 views

Beginner Question - Reading Temperature, Opening Water Valve, Status LED [closed]

I am completely new to Raspberry Pi and would like to hear your input on this project that I need to solve. My question is: What hardware do I need, how would I connect it and how would I solve the ...
1
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0answers
22 views

Interference with Freeview box

I have a model B raspberry pi running OpenELEC v4.2.1 connected to my TV using the composite output. I also have a Freeview box receiving terrestrial TV from a coaxial cable connected by Scart lead to ...
1
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1answer
45 views

Brushless motors with Raspberry Pi [closed]

I would like to know if brushless dc motor can be directly run with Raspberry Pi without using an ESC. Thanx.
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1answer
42 views

Pins I2C cannot be used as input

When using pin 3 and 5 as inputs, I get only 3.3v and I'm not able to use them as inputs. I use the same code and circuit on all the GPIO pins the circuit worked on every single pin except on this 2 ...
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2answers
93 views

What steps can be taken to use the Pi as mission critical hardware?

I want to use the Pi as mission critical hardware. I have had a Pi running an informational system for 2 years straight and wanting to try a few more things... What steps can be taken to ensure ...
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0answers
34 views

Pi dead: U3 IC gets extremely hot

I got two Pi's, and both of them have the same problem. To the first one, I connected a 3.3V power supply to pin 1, following which the board didn't boot and no LEDs lit. The board seems to be dead, ...
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0answers
25 views

Can i setting sampling rate 2k in MCP3008 or python [closed]

Can i setting sampling rate 2k in MCP3008 or python. I think to do this a long time but i don't have no idea. please help, thanks.
0
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1answer
56 views

How to measure DC current RPi?

I have recently bought a Raspberry Pi, and I would like to be able to measure the current flowing through the circuit in our Greenpower electric racing car. It would also be useful to record this for ...
0
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2answers
501 views

External USB 2.5" HDD's with the Raspberry Pi B+

Is it possible to connect two 2.5" HDD enclosures to a Raspberry Pi B+ with only one USB cable, or will I have to use both cables? I am asking this because I do not actually own a Raspberry Pi and ...
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0answers
48 views

Should SD card be removable with little pressure?

I;'ve just purchased a raspberry pi b+ and the Noobs card. I've inserted the card into the slot on device and heard it click. But I'm able to remove the card easily without re-pressing the card into ...
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0answers
19 views

SPI to soft UART

Is there a way to use the SPI on pi for UART communications without any external hardware? Is there a library in C for this?
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0answers
37 views

Is a Pi able to put a monitor connected via HDMI to standby?

I've installed xset and tried to send the monitor to standby with xset dpms force standby The screen goes black, but the power LED doesn't start to flash, so the monitor doesn't seem to be in ...
0
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1answer
34 views

Connecting a Long Stem Thermometer to a Raspberry Pi to automate the recording of temperature in an experiment [closed]

Is there a way to connect and read the output of a long stem thermometer like this one to a raspberry pi?
1
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1answer
78 views

Basic hand (touchless) gesture detection, solution needed

I need a good solution for basic gesture recognition (touchless), like swipe left, up, down, right, "tap" hardware/software for Raspberry Pi. I've seen http://www.hoverlabs.co/#hover which looks very ...
1
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1answer
354 views

Barcode Scanners compatible with Raspberry Pi

I would like to buy a barcode scanner to use with Pi, so which one will be compatible with Pi..?? Something around $50 would be great, like the Barcode Scanners we use at POS (Point of Sale), ...
0
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1answer
56 views

I2C and ST 24C64 (5V Problem)

I`m planning to use the 24C64 EEPROM with my Rasberry Pi. According to the datasheet the EEPROM "Single Supply Voltage" is 4.5 to 5.5 V. (Datasheet: ...
0
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1answer
79 views

Does the Raspberry Pi manage hardware interrupts?

I'm planning to use a raspberry pi to move DC motors using a PID programmed on the raspberry pi. the question is can I interrupt the raspberry pi by hardware, The idea is to interrupt it depending on ...
1
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1answer
288 views

Interacting with a RJ11 “phone” / Hardware

I'd like to be able to interract with a piece of hardware which is able to be controlled by a standard phone line (and provide vocal metrics, ...) Let me stress that it is not a modem, nor has it ...
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0answers
43 views

Soldering Components onto RasPi headers

I am trying to use the P5 header on the RasPi for soldering a switch to act as a safe shutdown button. But I am unable to solder the connections onto the headers. The reason for this, I believe, is ...
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0answers
56 views

Alternative IO board for Compute Module

Are there any alternative (unofficial/3rd party) boards for the (IMHO overpriced) official IO board that ships within the Raspberry Pi Compute Module Development Kit?
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1answer
946 views

How to switch my Raspberry Pi B+ with OpenElec on and off?

I have a Raspberry Pi B+ set up with OpenElec which I happily use as a media player for movies. What would be the best way to switch it on and off in a similar way I switch my TV or BluRay Player on ...
1
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1answer
109 views

Raspberry Pi B+ CPU clock manipulation

Is it possible to manipulate rPi B+ with ArchLinux system clock, I need to slow it down because of power management purposes.
1
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1answer
391 views

How to import Xbee to Python?

I would like to handle my xbee with raspberry pi via Python. I install xbee with this command: pip install xbee And I try to use this example code: #! /usr/bin/python # Import and init an XBee ...
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2answers
86 views

Data transfer from arduino to raspberry pi wirelessly?

How do I send data to raspberry pi connected over wifi from arduino connected to a laptop which is in turn connected to the same wifi network as raspberry pi?
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0answers
61 views

Did my PI lockup or was it halted?

I couldn't connect to my pi this morning until I turned it off and on again. I did this at around noon, didn't record the exact time, thereafter it connected via ssh. My sys.log state: Sep 18 ...
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0answers
15 views

Looking for a reference sheet for both Raspberry Pi and electronics for a study gruop

I'm planning to start a robotics study group for children or adults new to both electronics, robotics and programming. I've collected some reference sheets for programming, but I can't find any good ...
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2answers
232 views

RetroPie missing 'emulator' folder

I've installed RetroPie and I've tried update it to its latest version (I think). RetroPie runs fine and games load perfectly but the problem I'm having is getting a USB controller to work. I've ...
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0answers
43 views

Beginning with servos and PWM

As a way into getting myself back into learning more about electronics I'm trying to figure out how not to screw up configuring an Adafruit 16-Channel 12-bit PWM/Servo Driver with my pi. It's been ...
4
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1answer
431 views

Can Raspberry Pi B+ use a card (with Debian) configured/used with “old” Raspberry Pi B?

So, I've several SDs bearing several OSes (Debian, Occidentalis, Raspbmc) for my several Pi Bs and my question is two-fold: can I (safely) boot B+ Pi from those cards w/o a risk they will be ...
1
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1answer
79 views

model B wrong amount of ram displayed

I have model B with 512 MB of RAM, but htop displays 92/231MB free -h pi@raspberrypi ~ $ free -h total used free shared buffers cached Mem: 231M ...
0
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1answer
96 views

Scanning, OCR and adding the scanned numbers using a Raspberry PI

I asked this question on Superuser and was unsuccessful in getting enough attention (even with a bounty on it). So I'm here. System setup: The intended system will be a Raspberry PI connected to a ...
0
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1answer
124 views

Defining PWM ports to be used on the GPIO

Now as i have noted in previous questions i understand the PWM area of the raspberry pi is the most saturated area, but my question lies in which ports can actually be allocated as a PWM output due to ...
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5answers
114 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
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2answers
122 views

Raspberry PI will not boot unless I apply pressure to SD card

I have several Raspberry Pis that need extra pressure on the SD card in order to boot up. I have a temporary fix that involves scraps of envelope flaps glued onto the card but they become unstuck over ...
2
votes
1answer
750 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 ...
1
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1answer
319 views

Using other camera modules to build custom webcams

I have three old iPhones (iPhone 3GS, iPhone 3G and an iPhone 4) that I recovered from family members that were going to throw away. I had the 3GS so out of curiosity I disassembled it and recovered a ...