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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37 views
Best way to emulate network switching on PCB
I'm interested in wiring up some Raspberry Pi Compute Modules together on a custom PCB board with DDR2 SODIMM connector interfaces.
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19 views
Raspberry Pi Compute Module schematics [migrated]
I want to create a massive electrical switchboard PCB (24x 230V relays) with individual current and voltage monitoring using a RPi Compute Module as controller and the GPIO banks for controlling.
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2
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1answer
28 views
Raspberry Pi and USB modem - can I connect it like this?
As some of you know - Raspberry Pi has only 100mA available on USB ports.
I want to connect USB modem (that takes > 500mA sometimes) to my Raspberry without powered USB hub.
I have:
Raspberry Pi ...
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1answer
17 views
Trouble bridging connection between my Pi and my laptop's WiFi
I have been trying to get this working for a while now and still no luck. I have Googled and Googled till my eyes hurt and everything I try won't fix it. I have sharing disabled on both connections, ...
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1answer
72 views
Linear regulator LM1084 5.0V capacitors choice
I'm trying to make power supply for RaspberryPi and another one for usb hub and another for 9 Ping sensors(20mA)+ few servos + few microcontrollers like Atmega328P. I have only LM1084 or LM7805. So my ...
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2answers
94 views
Can I amplify high frequency signal?
I have found this awesome Raspberry PI FM transmitter project. It uses RPi GPIO pin to simulate FM signal. After some filtering to smoothen it, this could act like a real transmitter.
But at this ...
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2answers
63 views
raspberry pi relay
I'm trying to make the Raspberry Pi controlled relay. Searching the internet the whole day, I still cannot get it to work. ( I did not even connect it to the GPIO yet, just using the 3.3v rail).
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1answer
38 views
Writing to register on I2C device, returns device busy
I am trying to write data to a register on an I2C chip from the Raspberry Pi, when I use i2cdetect I get UU, which I understand is an error.
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1answer
61 views
Two circuits with different voltages - should I use a transistor or an optocoupler as a switch
I am doing a project using the output of a Raspberry Pi GPIO pin (3.3V) to power a 12V remote control.
If the two are on different circuits, can I use a transistor to switch on the 12V circuit or do ...
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0answers
9 views
Adding and Cascading Ethernet and USB Hub LAN9512 to Raspberry Pi [migrated]
as the title suggested, I am trying to add 2 ethernet interface and several USB port to my Rasp Pi. Since this will be used in project and the client wanted me to make the device as small as possible, ...
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0answers
13 views
Raspberry Pi Camera… What's the big deal? [migrated]
I remember when raspberry camera was announced everyone was very excited about this.
The question is why?
Couldn't you hook up regular cameras to pi?
Or maybe use a cell phone camera? What interface ...
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2answers
75 views
Can a Raspberry Pi control a servo motor?
Can a Raspberry Pi (RPi) board can control a 10Amp servo motor ?
I read on the Internet that a RPi could control small servo motors.
If so, is there an add-on board that, when connected to the Pi, ...
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3answers
71 views
Identify key in a multiple keys, single lock system
I have a hobby / office project underway.
We want to issue a key to multiple users each with a different pin pattern. Upon turning the key we want to identify the key and thus the user.
My google fu ...
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0answers
13 views
Raspberry Pi with boots up with Rainbow screen [migrated]
How can I fix a Raspberry Pi with Rainbow screen on boot up? I have good voltage coming in and I believe I've formatted and setup the SD card properly. I have two of these boards that do the same ...
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0answers
28 views
How to connect SINAMICS V60 driver to RaspberryPi
I have a Siemens motor with SINAMICS V60 driver (10A). Here is the Getting Started Manual (28MB PDF) .
I want to connect this driver to the GPIOs of my raspberry Pi board. The purpose is to control ...
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0answers
37 views
ADC and Pre-Amp Suggestion for RBpi
I want to receive VLF signals (between 15kHz to 30kHz) with my RBPI. So I can found only this antenna:
Miniature Very Low Frequency Antenna
ANTM1. This miniature 6 inch long antenna can be ...
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1answer
116 views
Programmable Bluetooth transmitter
As I develop my R&D project I decided to add bluetooth to the mix... In the first stage I decided to use my own iMac as a transmitter and my iPhone as the receiver, and it worked great...
As I ...
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0answers
18 views
Using Arduino ADK as a USB to TTL converter?
I know this can be done with the UNO, but does anyone know if it would be possible to use my Arduino ADK as a USB to TTL converter, then use that to program my Raspberry Pi instead of using a regular ...
1
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2answers
118 views
Creating an opto isolator board for Raspberry Pi
I have a relay board which I bought from dx.com and I am not sure about its reliability. If it fails, then it may harm my Pi right? So I googled around and read that opto isolator provide complete ...
1
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1answer
81 views
Connect VLF antenna to raspberryPi
I want to connect two VLF antenna (given below) to a RaspberryPi using it's GPIO ports with a MPC3008 ADC.
Desired frequency range is between 3kHz to 30kHz, and MPC3008 supports 200,000 samples/sec ...
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2answers
99 views
Question regarding PCB design layout of Raspberry Pi
I have query regarding PCB design layout of Raspberry Pi (RPI). I wanted to know how LAN9512 chip is connected to Ethernet RJ45.
I found one of PCB layout picture which suggests there is line on PCB ...
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1answer
81 views
UART connection
I want to implement an UART port, just like the raspberry, but I have seen other connections that include more pins (like the picture below)
In some cases, only TXD, RXD, CTS, RTS, GND are ...
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1answer
90 views
How to power Raspberry Pi with a Flight Controller
I am making an autonomous quadcopter and I need Raspberry Pi on board to implement image processing. The issue is that I have a 4in1 ESC which comes with only one UBEC to power the flight controller, ...
3
votes
1answer
61 views
How to read SAA1064 7-segment values
I have a central heating system that displays it's info and error codes on 4 7-segment displays. These displays are driven by a SAA1064, like so:
This SAA1064 (datasheet here) receives it's ...
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1answer
96 views
Raspberry Pi SPI interface with PIC-16f877A
My project is to receive sensor data at I2C of PIC and transfer it to Raspberry Pi via SPI.
How can I interface my PIC and Raspberry Pi so that PIC starts receiving data as per command (SPI ...
2
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1answer
58 views
DS18B20 with MOSFET - reading temperature from multiple sensors on Raspberry Pi
I am attempting to read temperature data from 10 DS18B20 sensors, not connected in parasite mode.
It happens quite often that I don't get a reading from a sensor. I read online a bit about MOSFET's ...
1
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0answers
34 views
Need circuit to power string of LEDs via TV USB port and separate psu [closed]
I built a ambilight clone with a raspberry pi and a string of ws2801 LEDs. The LEDs are powered by a 5v 2a power supply. I would like to build a circuit that detects the 5v coming from the TVs USB ...
4
votes
2answers
111 views
How to create a touch switch to use with a Raspberry Pi
I'm trying to make my own wakeup lamp. I have a lamp with a large metal base to hide all the components in. I also have a Velleman K8064 DC Controlled Dimmer Kit which I have put together and is ...
1
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1answer
58 views
Need specifications to operate this stepper motor with RPi or Arduino
Here is the disassembled stepper motor that I'm working with:
I need to identify this stepper motor that was retrieved from scrap for a project. Budget constraints force us to use the scrap ...
2
votes
1answer
143 views
FPGA or microcontroller for this robot
I am at a loss of whether I need to use an FPGA or a microcontroller.
I need to build a robot that can chase my cats around and shoot them with a water gun. So there seems to be a number of parallel ...
3
votes
2answers
257 views
Control 12 solenoids with a raspberry pi
I'm a musician and I'm working on a funny project : control solenoids with a midi keyboard.
So I have a MIDI keyboard connected to my raspberry pi connected to my breadboard. Until now everything is ...
5
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6answers
982 views
Sending I2C reliabily over Cat5 cables
I am considering implmenting an home automation system around my Raspberry Pi but I found the price and space requirement of inserting a Pi every place some control is required too much but the Cat5e ...
1
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1answer
115 views
ATX-PSU to supply PC and RaspberryPi
I want to integrate a RaspberryPi into the case of my desktop PC, that has an ATX-PSU. I want the RaspberryPi to keep running, even if the PC is shut down. It would be nice to avoid the additional ...
2
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3answers
226 views
Ground loop when measuring in process pH
I have been experiencing a very difficult to solve ground loop problem with my pH measuring system. My basic setup is a standard pH electrode running through an op-amp to an ADC which communicates ...
1
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3answers
156 views
Creating and Receiving Electromagnetic Field with RaspberryPi
I am trying to make a basic HLEM (Horizontal Loop Electromagnetic) device for my undergraduate thesis but I haven't started yet, just researching that can I build it myself without sufficient help. I ...
1
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3answers
177 views
NPN BJT Relay Circuit will not turn off
I'm applying a 3.3V signal with my Raspberry Pi to the base of an NPN transistor to activate a SPDT 6V relay (relay data sheet, model G2R-1-S-DC6(S)). The relay pickup/dropoff voltage is 4.4/0.9V. ...
2
votes
1answer
88 views
Best way to short these pins?
The pins that the arrows are pointing to are for the power button on my camera. If I take a small piece of wire and touch the two leads (they seem microscopic), then the camera turns on and off. I ...
2
votes
2answers
176 views
Ultrasonic Sensor Controller
I am working on a project at school where we need sonar input to control a little vehicle. Pretty simple stuff, usually. However, we're having a bear of a time getting the sonar to work. My faculty ...
3
votes
3answers
628 views
Powering a Raspberry Pi from 12 V DC
I new to electronic engineering and am trying to learn electronic engineering by creating little projects. I have a few questions about powering my Raspberry Pi (5 V DC @1000 mA) from a ...
0
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1answer
79 views
AVR ISP-Programing LEDs SCK
I'm using a Attiny45 microcontroller and USBtinyISP as my programer, and this is the first time I need to hook stuff up (in this case just LEDs, but eventually I'll want to conect a raspberry pi) to ...
1
vote
2answers
81 views
How does a CD-ROM rotor know when to stop the moving plate?
I need to make a mechanism with a RaspberryPi like in CD-ROMs, so I can easily move a plate from the minimum position (CD-Rom closed) to maximum (CD-ROM open). I have a DC motor (from CD-ROM) and I ...
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1answer
49 views
Pi4j port for pcduino
Do you know any port of Pi4j for PCDuino boards or anything similar?
I am particularly interested in I2C, oneWire and Serial reading.
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2answers
103 views
5V wallwart to 4 USBs and 3Pin fans
I am working on a small Raspberry Pi cluster that I am going to use for web hosting, home automation, cloud storage, VPN, and so on. I plan on using the 3D printer and laser cutter/engraver at my high ...
0
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1answer
58 views
2 sources one speaker - for old rotary phone
I have built a "mobile" phone using an old GPO 746, a Raspberry Pi and an old Nokia 6301, amazingly I have managed to get the audio to/from the phone's 2.5mm jack plug to through the GPO handset, ...
5
votes
3answers
177 views
Wheatstone bridge sensitivity and accuracy
From my earlier question I was able to wire up 2 SEN-10245 weight sensors (each forming one half of a wheatstone bridge) with an AD620 InAmp & 47 Ohm resistor (to set the gain to ~1000). I then ...
2
votes
1answer
66 views
Is it possible to use the RTS pin as DTR?
I'm deveoloping a project with a raspberry Pi that involves serial communication. In order to properly handle voltage levels, I used a max3232 converter between the raspberry and the external device ...
1
vote
2answers
131 views
Bidirectional driving solenoid using H bridge and raspberry pi
I want to drive a old phone ringer solenoid bidirectionally (20 Hz) using raspberry Pi GPIO pins. I am new to electronics, but I thought a H-bridge design would work to do this:
The solenoid is 500 ...
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votes
1answer
66 views
Appropriate electronics to use for scoring closest Nerf football air cannon shots? [closed]
Appropriate electronics and sensor technology to use for scoring closest Nerf football air cannon shots? The general concept would be to have a target area marked on the ground around a target device ...
0
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1answer
40 views
Slice of Pi wiring
I'm trying to wire a Ciseco Slice of Pi.
I need to break out the 3v3, 5v and GND solder pads as I need several of each. There's no track between the pad and the holes I want to use. I could wire ...
1
vote
2answers
207 views
How to create USB toggle switch controled by GPIO
I have Raspberry Pi setup as NAS. The storage is external HDD powered through USB. I would like to encase this whole thing in some nice box and still be able to easily use the HDD, without ...
