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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24 views
Hobby King 30A ESC 3A UBEC AS a voltage regulator
I wanted to efficiently step down 11.1V into 5v for my raspberry pi so i ordered (after reading many forums suggesting) this 5V UBEC thinking it would be simple switching regulator with two wires ...
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0answers
25 views
Setting up RFM12Pi v2 on Raspberry Pi
I recently bought a RFM12 v2 receiver and connected it to my Raspberry Pi. I also have some transmitters but I can't make all of this work.
When I start my Raspberry Pi, the green LED on the RFM12 is ...
0
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1answer
53 views
RC Car mounted Raspberry Pi runs out of juice
I'm trying to make a Tamiya Blackfoot RC car run on a Raspberry Pi.
I've written a small C program for controlling the servo and the ESC/motor with a wireless gamepad. Everything is working fine ...
1
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0answers
33 views
MOSFET to be switched by a raspberry pi
My raspberry pi produces a 3.3V on it's GPIO. I want to buy a through hole MOSFET so I can simulate touch-events on a smartphone screen like this video. I'm trying to find something on Digi-Key, but ...
0
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2answers
57 views
retail store visitors counter [closed]
I want to count how many people every day visits our store. In store has two entrances. Second entrance is not used often. Entrance gate is about 1.5m wide. I plan to attach some device to Raspberry ...
1
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0answers
38 views
small, fully functional pc boards and kinect (example Raspberry Pi) [closed]
I have discovered that people trying to prototype a kinect controller with Raspberry Pi have had limited to no success. I found some people with limited success with PandaBoard. I am now interested ...
1
vote
2answers
100 views
Can ATmega88 be run at 3.3V with internal clock?
I want to use a few ATmega88s with Arduino bootloaders to act as I2C stepper drivers and temperature controllers that will interface with a Raspberry Pi. The thing is just that it seems the RPi ...
2
votes
2answers
114 views
RGB LED brightness levels
Do RGB LEDs have very different brightness levels?
I'm running an RGB LED (common cathode) via some TIP120 transistors, controlled from a raspberry Pi.
There is a 5v feed from the rPi.
Initially I ...
1
vote
2answers
120 views
Data lost writing on Arduino serial port. Overflow?
I have an Arduino connected to a linux box (a Raspberry Pi). I'm reading an analog pin and writing it out with Serial.println() together with the value of ...
3
votes
3answers
143 views
Best way to hook up Many analogue sensors
I started a home project which has become almost impossible i think and its all my own fault!
I planned on using a raspberry pi to monitor around 80 analogue sensors - specifically force resistors. I ...
0
votes
1answer
72 views
Converting 3.3v logic level to 5v using octal bus transceiver
I'm using the Raspberry PI to communicate with various sensors and other circuits that input and output 5V logic level. The Raspberry Pi itself has 3.3V GPIOs, so i need to convert the logic levels.
...
0
votes
1answer
41 views
Which controller board is best for hooking up rasberry pi to Traxxas 5675 Titan 77? [closed]
Can I hook this motor up to my rasberry pi?: http://www.amazon.com/Traxxas-7075-Titan-Brushless-Motor/dp/B0027GGZYU/ref=pd_sbs_t_4
How about this one?
...
1
vote
1answer
101 views
Random SPI Signals on LPD8806 LED Strip
I've got a long run of some LPD8806 driver-based LED strips (which use an SPI connection) that I am controlling via a Raspberry Pi. It controls it just great, but when I have the LEDs all off (not ...
0
votes
2answers
111 views
best way to detect if vehicle is running
Plan is to place in vehicle Raspberry Pi with camera. And fully automate startup/shutdown of raspberry. So - what is best way to detect that vehicle is running? ...
0
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0answers
30 views
XBee module lockup/freeze
I am using Xbee series 2 modules to handle communications between my home automation modules. As my base station, I am using Raspberry PI with Xbee coordinator attached to it.
It all seems to be ...
2
votes
1answer
131 views
How do I get 5V for a Raspberry Pi from 4 D batteries?
I'm hoping to run a Raspberry Pi and a hobby servo off 4x1.5V D size Alkaline batteries. The batteries are brand new and at the moment I am measuring 6.5V from the 4 in series. I'm guessing each cell ...
1
vote
1answer
68 views
Socket wiring to relay + Ardunio / Pi
I’m working on a personal project at the moment and needed a small amount of electronics help. What I am building is a RaspberryPi/Arduino connected to wall plugs (which is not being fitted to the ...
0
votes
1answer
80 views
Setting up Raspberry Pi detection of multiple FSRs
I am trying to start a home project with a raspberry pi. I want to link a number of these force-sensitive resistors up
The issue is i really want to assign some form of id so i can tell which has ...
0
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2answers
91 views
Control 12v circuit from a Raspberry Pi
I'm looking to control a 12v/2A circuit from a Raspberry Pi but I'm a little lost on what I need to get to operate it.
I was looking at the following but with a IRLZ44NPBF transistor and a in4004 ...
1
vote
0answers
49 views
Rasplex, Pi and USB keypads [closed]
Looking to create a music playing solution for the shower using a Raspberry Pi loaded with Rasplex. Have the Pi and a monitor external to the shower with then a usb controlled 4 button pad as here, ...
2
votes
0answers
61 views
Determining Capacitor Discharge Rate
First time poster, apologize if I accidentally missed any rules.
I've built a circuit that keeps a relay closed that is attached to battery power for a specific amount of time so my Raspberry Pi has ...
0
votes
1answer
132 views
NOT another Arduino vs. Raspberry Pi question [closed]
I've developed an interest in electronics, more specifically getting to the very root of how my operating system functions. My goal over the last few years has been to learn as much as I can about ...
3
votes
5answers
187 views
Looking to build signal level converter to reduce 20V input to 3.3v out. Am I on the right track?
I'm working on a small pet project with my RaspberryPi and I'm looking hook it up to some sensors. The output from the sensors is normally at 0v but when the sensor is triggered, goes high to 20v. ...
0
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0answers
88 views
Use Dell Laptop internal speakers with Raspberry Pi
I have some speakers from an old Dell Latitude D600 that I and a friend took apart (his brother had managed to fry the motherboard?!!?) and so we salvaged some parts, one of which is the speakers.
...
0
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0answers
96 views
Connecting Raspberry Pi GND to GND of external source
This is probably a very basic question but the concept of GND always confuses me.
My setup:
Raspberry Pi connected with MicroUSB to a power supply.
External circuit supplied by an ATX power supply ...
3
votes
1answer
184 views
Powering a raspberry Pi using an ESC (Electronic Speed Controller)
I'm working on a quadcopter project using Motors/ESCs, an Arduino DUE and a Raspberry Pi.
I have 4 motors and 4 of these Opto ESCs.
At the moment I have the raspberry Pi plugged into the mains ...
1
vote
3answers
203 views
How do I easily power a “mashed-up” project?
I'm working on a hobby project that involves a Raspberry Pi (with a powered USB hub for reliable wireless), an Arduino (driving a hobby servo, controlling some LEDs, etc.), and an audio amplifier (not ...
3
votes
2answers
234 views
Driving 7 segment displays through Raspberry Pi's GPIO
So I was thinking of wiring up four 7-Segment displays through the Raspberry PI.
I'd do that by multiplexing each of them, and came across this:
...
0
votes
0answers
55 views
How do I program a serial EEPROM IC using a raspberry Pi?
I am trying to program the 25L12835F Serial EEPROM with the firmware of the Pineapple WiFi router. I have the u-boot.bin file from Alfa. I have tried a programmer from eBay, but the software is unable ...
0
votes
1answer
75 views
Raspberry pi power supply
I am a beginner to this Raspberry Pi board. I wanted to power my board using 5V adaptor. I am currently having phone charger whose output specifications are 5V, 0.7 to 1A. So can I use the same ...
0
votes
2answers
148 views
Drive a DC motor as the maximum speed with a Raspberry PI
I am new to the Raspberry PI and I don't have strong background in electricity (but I'm here to learn).
The problem:
I have a dc motor that works at 12V, and I'm trying to let it run with the raspi ...
2
votes
1answer
104 views
Clamp diode to a solenoid activated by a raspbery pi, how do I choose it?
I need to activate a solenoid using a raspberry Pi, to do that I'm using a TIP121 to drive the current and a 12V power supply to power the solenoid. I also put a clamping diode (1N4001) but I'm not ...
0
votes
1answer
94 views
How can I trigger a photography strobe from a iPhone LED flash?
I would like to trigger a photography/studio strobe flash based on the flash of an iPhone camera's LED flash. I'm picturing a device that I could attach to the back of the iPhone temporarily when I ...
6
votes
1answer
276 views
Switching MOSFET from Raspberry Pi GPIO
I'm trying to drive a STP16FN06 from a Raspberry Pi GPIO pin but I'm a bit lost.
The schema below represent (I think) how it is currently wired, on the left the RPi pin + ground and on the right a 5V ...
5
votes
1answer
204 views
Low-side MOSFET: Current seems limited
I'm trying to use a MOSFET, an N-channel (specifically this one), with a gate controlled by an AVR to power on/off a Raspberry Pi (powered through GPIO), I'm using it on the low side. (Both share the ...
1
vote
1answer
71 views
Shift register with the Raspberry Pi
I have recently bought some 74HC595N (datasheet) shift registers to play with using my Raspberry Pi. The Raspberry Pi has a general purpose clock that I think I should be able to make use of, however ...
2
votes
1answer
103 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?
7
votes
2answers
470 views
Using a microcontroller to turn on LED strip
I have 60 leds that came in a strip. One meter of the led strip requires:
400 milliamps
12 volts
I want to control these LEDs with micro controller. I'm thinking of using a TIP120 and a ...
0
votes
1answer
85 views
Wiring a 24-volt Swamp (Evaporative) Cooler for Control With Relays
I am attempting to build a raspberry pi controller for my MasterCool swamp cooler, which has a rather dumb controller. The cooler has the 24V low-voltage control kit (as opposed to 120V or 240V direct ...
1
vote
1answer
62 views
Clocks setup when programming Atmel via ISP?
When programming an Atmel microchip over SPI (ISP), what external clocking do I have to provide to programee? Does it have to match programmer's internal clock frequency, or can be totally different ...
1
vote
1answer
105 views
Raspberry Pi / Arduino Button GPIO pins
I got myself a little button to start playing around with. Attempting to hook it up to a Rpi.
What I wanted to confirm was the purpose and pins for each wire. The button I got is ...
1
vote
0answers
124 views
Power coming from unknown source
Power coming from unknown source
Hi, I have a quite complex circuit with 5 DC/DC Converters all being powered by a 28V power supply and with a common ground. All DC/DC converters have a on/off ...
0
votes
1answer
248 views
LCD screen gets hot and sucks power from Raspberry Pi
Has anyone else experienced LCD screens overheating, and drawing too much current? I was trying a GPIO project with my Raspberry Pi in an attempt to interface with an LCD screen but for some reason my ...
4
votes
1answer
172 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 ...
-1
votes
2answers
202 views
Raspberry pi relay check from remote
I'll start saying that I'm almost noob on electronics, so that's why I'm here.
I'm looking for a smart way to check the state of an RF relay module remotely.
This is the relay module:
The module ...
0
votes
1answer
42 views
Development Board Choice [closed]
I've been working with the ATmega328 microcontroller for some time, with great success, but recently my projects have gone beyond the edge of its capabilities. I thought of switching to ATmega2560 but ...
0
votes
3answers
465 views
How to connect Raspberry Pi to House Alarm Serial Bus (DSC Keybus)
I have a DSC 1864 House Alarm and I want to connect up my Raspberry Pi's GPIO to the Keybus (a serial data communication protocol used by the alarm).
I would say my knowledge of electronics is novice ...
2
votes
1answer
191 views
I2C Raspberry Pi to PIC24F
I'm new to PIC's and PIC programming but I'm working on a little project to try get a PIC24F32KA301 to communicate with a Raspberry Pi using I2C. The Raspberry Pi is the master and the PIC is the ...
7
votes
4answers
531 views
shorting a remote control pushbutton with GPIO and a transistor
I'm trying to control my garage door remote with a GPIO pin from my Raspberry Pi. Instead of driving a relay, it would be much easier to just short the pushbutton on the remote. Is this how I ...
1
vote
1answer
109 views
Connecting an always on LED to a raspberry pi [duplicate]
I'm new to electronics, so I thought I'd start simple and just connect an LED to the GPIO on the raspberry pi, to pin 1 (3.3v) and the ground pin.
But I'm having trouble calculating the resistor I ...
