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 ...
1
vote
1answer
28 views
Using a FTDI to USB adapter with a raspberry pi and a roomba [on hold]
I'd like to control a Roomba 560 using its 8-pin mini din SCI port. I've seen other people do this successfully but I'm still unclear on how exactly to go about this. I was planning on using an USB to ...
1
vote
1answer
50 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 ...
0
votes
1answer
49 views
How to wire external power supply on stepper motor
I followed this tutorial to setup my stepper motor.
Now my stepper needs 12V and not 5V. So I was wondering how I can add an external power supply without destroying my pi.
I found this:
But it ...
1
vote
3answers
115 views
Step up DC-DC converter for powering Raspberry Pi from batteries
I will power a Raspberry PI with 4 NIMH batteries, but they quickly lose charge, and end up at 3V instead of the 5V needed. I was wondering about a DC-DC step up converter.
I want a converter that ...
0
votes
0answers
28 views
Using PIC16F707 and Raspberry Pi for Touchscreen display
I've been asked to make a static touch screen for a store display with a very low budget.
Due to the cost limits and large number of 'buttons' required, I've considered the PIC16F707 since it has 32 ...
0
votes
1answer
67 views
I want to build a dehydrator [closed]
The basics are that I need a food grade box that insulates a cavity of air.
My intentions are to use a raspberry pi or some other similar platform for the electronics.
I'd like to build a box that is ...
8
votes
3answers
932 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 ...
0
votes
0answers
60 views
Snapdragon 200 vs Raspberry Pi
I and a few friends are creating our own games console, and I would like to ask a question on our behalf. We're all teens, so making our own Hardware is implausible. So, we were considering Either a ...
0
votes
1answer
54 views
Raspberry pi with direct relay
I have a very back to basics question.
I've been using a 5v relay with the raspberry pi. The relay trigger is connected directly to an output pin and the other side is connected to the ground of the ...
2
votes
3answers
86 views
Why does my switch need to be wired in this fashion?
Today was my first foray into electronics since high school, in the form of some simple Raspberry Pi experiments. I managed to get a circuit working where a switch controlled an LED with a ...
1
vote
1answer
94 views
RaspberryPi I2C sensor - capacitor's role
I'm new here and the same goes to my electronics "history". I like to understand things I'm dealing with even if I wasn't provided with a sufficient knowledge background at schools.
What I'd like to ...
2
votes
1answer
57 views
Tradeoffs of XBee vs. Wifi for remote sensor & camera
I'm planning to build a remote sensor for my driveway gate, which is about 250' from the house (line of site). The basic requirement is to notify my HA system when the gate opens or closes, but I ...
1
vote
0answers
33 views
Ir detector lamp, digital monitoring [migrated]
I just bought this IR-detector+lamp device http://www.biltema.se/sv/Bygg/Belysning-och-lampor/Arbetslampa/Halogenstralkastare-med-IR-detektor-46191/
It turns the light on for a certain time when ...
3
votes
1answer
86 views
Externally Powered USB Port
I have a Raspberry Pi and it requires a Externally Powered USB hub to run Portable HDD on it.
So what if I connect +5 and GND port of the USB Client to external power source of 5V-1A directly rather ...
1
vote
0answers
40 views
Accessing Diagnostic Trouble Codes (DTCs) in car [migrated]
I want to know how can i access DTCs by writing a code and parsing it? i have RaspberryPi and related hardware for communication with the OBD-II of car. I will generate manual faults and then after ...
2
votes
1answer
81 views
Reading and writing CAN messages through ELM327
I have an OBD-II cable, and an UART-to-OBD-II board which has the ELM327 IC in it. I want to communicate with my ECU by sending-receiving CAN messages. Is it possible to communicate through ELM 327?
...
0
votes
0answers
111 views
Digital Potentiometer (MCP4131) with Raspberry Pi
I'm very new in electronic stuff. I'm used to develop for desktop and mobile applications not for hardware products.
I try to wire up my Raspberry Pi board with a MCP4131 Potentiometer. But it's not ...
2
votes
3answers
114 views
Logic level converter for H-bridge and UART for Raspberry Pi
Here is my situation:
I'm using a raspberry Pi to control a H-Bridge. The H-Bridge is not tolerant of both it's inputs being high logic value, which causes a short through the transistors, bypassing ...
0
votes
4answers
80 views
Check if electrical current exists in high voltage
I'm thinking about a simple home automation project, containing a Rasberry Pi, a Sainsmart SPDT Relay, I would like to switch the state of a ordinary bulb (ON , OFF) using both the relay and the old ...
-1
votes
1answer
55 views
Need +9V power supply for breadboard (3x Stepper motors). Tried Arduino wall wart [duplicate]
I need to supply +9V to three stepper motors on a breadboard with driver carriers (see parts below). Its too much for my raspberry pi to handle, apparently. I was able to power and control a single ...
0
votes
0answers
45 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 ...
0
votes
0answers
95 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
votes
1answer
233 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
vote
0answers
62 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
votes
2answers
159 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
vote
0answers
50 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
131 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
211 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
202 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
169 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
162 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
103 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
226 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
138 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
votes
0answers
58 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
193 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
103 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
120 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
votes
2answers
194 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
60 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
76 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
139 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
236 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
votes
0answers
120 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
votes
0answers
119 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
366 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
216 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
336 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
85 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
87 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 ...
