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 ...
4
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3answers
75 views
Serial bus Raspberry Pi to multiple AVRs
Background: I'm trying to replace the electronics for a ice hockey scoreboard. The old electronics had the following issues:
It stop working. I have since discovered that a couple of diodes and ...
1
vote
3answers
65 views
Higher resistance resistor in place of higher wattage?
Engineering newbie here. I'm fairly sure I already know the answer to the question, but I figure I'll ask anyway.
I've got an LED lying around, that according to an LED calculator requires a 80R 1/2w ...
0
votes
1answer
69 views
How can I decide whether I can use a Raspberry Pi for my application?
How do I calculate whether some specific hardware can run my code with a given speed?
It's an image recognition software, and a simplified version of the algorithm is:
Grab a frame (in RGB, ...
-3
votes
0answers
45 views
Timetable controlled digital potentiometer [closed]
Objective:
Control digital potentiometer (transistor) (up to 1kW output) and relay switch using specific timetable.
E.g. slowly turn on (15 mins - from 0% to 100%) lights on 6 A.M. everyday. After ...
-3
votes
0answers
41 views
What USB Devices exist to control motors and connect sensors? [closed]
I am planning to use a Raspberry Pi for controlling an automated toy car. I would like to know what USB devices exist that have several slots for connecting motors and sensors. My plan is to connect ...
1
vote
0answers
72 views
How to properly turn off a Raspberry Pi when instant plug-out is a criteria [duplicate]
I want to create a stand-alone internet radio device. Therefore I want to use an existing subwoofer box with connected speakers. Inside the subwoofer box there is the electronics for the sound system. ...
2
votes
1answer
57 views
Frequency Scaling and current draw
I am trying to power a RPi of 4 AA's, and my mobile power device can only output limited current (500mA), but I can underpower my RPi by frequency scaling. Is frequency scaling and current draw a ...
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votes
0answers
51 views
system architecture [closed]
hello im doing a home automation project that have this architecture:
android client communicating with a raspberry pi that contains a server for authentification, infromation gathering and request ...
1
vote
3answers
143 views
Convert 9v of battery into 5v at 3.5watt
I want to run Raspberry Pi using a general non-rechargeable 9v battery.
Raspberry Pi needs 3.5W and 5V input.
Questions:
Which LDO should i use ?
For what amount of time general 9V battery is able ...
1
vote
1answer
67 views
Interactive Single Color LED Matrix
I'm trying to build an LED matrix (32x16) that lights up in certain areas in response to movement, as detected by another matrix (8x16) of infrared phototransistors.
Here's where I'm at:
Main ...
2
votes
2answers
127 views
Can't Get Raspberry Pi and Xbee to Work Together
I am having the hardest time trying to get my XBEE's to work with my Raspberry pi (RP). I have one on a USB breakout board into my computer and the other XBEE connected to a RP. The one on the RP is ...
5
votes
2answers
438 views
Is the Raspberry Pi a microcontroller or a motherboard? [closed]
I had quick question regarding Raspberry Pi: is it a microcontroller or a motherboard?
It looks like a motherboard, but considering that it has its own dedicated memory and processor, it should be a ...
1
vote
1answer
93 views
Reading Array of Phototransistors With Raspberry Pi
For a project I'm working on, I need to read the values from a matrix of phototransistors (8x16) into the Raspberry Pi.
I'm not exactly sure how to go about doing this, since I know I need to include ...
0
votes
1answer
50 views
24-bit parallel TFT module on circuit designed for 16-bit parallel
I've designed a circuit that connects a 16-bit parallel LCD TFT module to the SPI-connector on a RPi, but bigger TFT modules often have 24-bit parallel. Can I use a 24-bit parallel TFT with my circuit ...
0
votes
1answer
84 views
Rasperry Pi Out to XBEE In
I am using the IO pass through mode on an XBEE, so basically if one XBEE has a high input, it passes that input to the other XBEE and that XBEE's output is also high. Since the Raspberry pi has an ...
