Questions tagged [raspberry-pi]

The Raspberry Pi is a credit-card sized computer that plugs into your TV and a keyboard. There have been several generations of the device with improved performance, more memory, and more connectivity. This tag should be used for electrical engineering questions that involve the use of a Raspberry Pi. For questions about the Raspberry Pi itself see the raspberrypi.stackexchange.com Raspberry Pi specific forum.

Filter by
Sorted by
Tagged with
6
votes
3answers
7k views

Using larger resistor values

I'm connecting a Raspberry Pi to an LED and this video tutorial says that I need 270 Ω resistors. I only have 100 Ω, 1 kΩ, and 10 kΩ resistors with me. Is it okay if I use the 1 kΩ resistor?
0
votes
2answers
887 views

i2c bus isolation using Si8400

I am currently working on optical isolation of the i2c bus in order to remove the risk of damaging the PI from outside noise. I am using Si8400 optical isolator but I was so far unable to make it ...
-2
votes
1answer
381 views

Is it possible to connect a raspeberry pi to a 3.2" TFT LCD touch panel?

I am wondering if i can connect a raspberry Pi to this? How hard would it be?
0
votes
2answers
4k views

How RF 443.92 MHz works?

I have an RF 443.92 MHz transmitter and the receiver, the model is TWS-DS-3 and I'm trying to understand how does it works. There are 4 pins (GND, Data In, Vcc, ANT), I'm going to wire the Vcc on a 5V ...
12
votes
1answer
7k views

Plugging a LDR into GPIO pins of a Raspberry Pi

I want to connect a LDR into the GPIO pins of my Raspberry Pi, I know that Raspberry Pi doesn't have an analog-to-digital converter so what I want to do is to signal a HIGH signal (3.3v) on the GPIO ...
1
vote
4answers
5k views

I2C optocoupler separation - which IC?

I am designing a circuit which will have some external I2C sensors connected to it and thus I want to protect it from noise - via an optocoupler. I have to say that I am a complete novice to this all ...
4
votes
4answers
8k views

Raspberry Pi wiring simple LED

I'm completely new to hardware in general. I just got a raspberry pi and was messing around trying to get an LED to light up. I have everything wired like the picture below. I am using a 330ohm ...
1
vote
2answers
395 views

Should I connect 3V3 in UART

My Raspberryπ has a serial console in its GPIOs. My logic level UART converter has four pins: GND, RXD, TXD and 3V3. It works without connecting 3V3. Why should I want to connect the 3V3 pin to the ...
5
votes
2answers
1k views

Raspberry Pi as basis for commercial device?

I am thinking of using a Raspberry Pi as the basis of an electronics project that I am working on, and plan to eventually sell to the public. I want to use the Raspberry Pi in order to reduce the ...
1
vote
3answers
3k views

Raspberry Pi and laptop display

I have a Raspberry Pi Model B and the display unit from a Dell laptop - functional, but removed from the laptop because of a broken hinge. Is there any way the Pi's GPIO pins can be used to drive the ...
0
votes
2answers
3k views

GPIO remote switching PC on/off

I saw a post on raspberry official forum. It's about GPIO remote switching PC on/off, but it is not very detailed. I am pretty interested in it and i have this relay. I am wondering if anyone here has ...
4
votes
4answers
4k views

Using a 5V LCD screen from a 3.3V Raspberry Pi GPIO pin

I have an LCD screen which expects power from a 5V line, but I want to hook it up to my Raspberry Pi's GPIO pins which only supply 3.3V. What equipment do I need to increase the voltage from 3.3V to ...
2
votes
2answers
2k views

How can I get extra power for USB 2.0 device?

I have a raspberry pi and a WiFi module, unfortunately I can't get enough power from the raspberry to power up the WiFi module. Can I power up the device if I cut an USB cable, I'm letting the data ...
1
vote
3answers
418 views

How to go from GPIO to digital signal?

I'm sitting here with my Raspberry PI and some other equipment that requires digital signal (high/low, enabled/disabled). But the Pi only has a GPIO so to get it to work I would need a microchip of ...
3
votes
1answer
1k views

Arduino / Raspberry Pi: Voltage Converters and IO-Pins

I want to drive an LCD that needs 6V from a RaspberryPi. The Pi has a 3.3V logic power-pin, and a 5V power-pin that's directly connected to the MicroUSB-PowerSupply. Am i right in the assumption that ...
9
votes
5answers
12k views

Raspberry PI without OS on it?

I've been doing a lot with Arduino recently. It's very simple because you can directly execute C++ code on it without the need of operating systems or drivers. I've done some research and AFAIK, you ...
4
votes
3answers
1k views

I can't use digital ports with my raspberry pi?

I have a raspberry pi that I really want to be able to control some motors and was thinking of this one at sparkfun: http://www.sparkfun.com/products/9670 The problem is that the Pi does not have ...
2
votes
6answers
5k views

Can I safely use a HDD in a car?

A few months ago I bought some new speakers and an amp for my Jeep. I made a little face plate with an ALPS potentiometer to control the volume and it has an iPod dock (no head unit, just the pot). ...
2
votes
1answer
755 views

Connecting multiple cameras to a single CAMIF (Camera Interface)

I am looking for examples of connecting multiple camera modules to a single CAMIF for multi sensor still-image acquisition (ie, very low speed per sensor). The broadcom chip used in the raspberry pi ...
1
vote
1answer
679 views

Simple voltage build-up circuit

I'm planning on buying a Raspberry Pi and I want to power it using solar energy. Since the voltage input needed by the Raspberry Pi is 5 Volt, I need to build up the relative low voltage power input ...