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 Raspberry Pi specific forum (raspberrypi.stackexchange.com).

The Raspberry Pi is a single-board computer developed in the UK by the Raspberry Pi Foundation. 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 a desktop PC can do, like spreadsheets, word-processing, and games. It also plays high-definition video.

There are several generations of the Raspberry Pi, as well as several variants. More recent generations such as the Raspberry Pi 3 have faster processors and more capabilities such as WiFi and Bluetooth.

The processor used depends on the Pi generation, though all (as of 2017) are ARM processors. The design does not include a built-in hard disk or solid-state drive, instead relying on an SD card for booting and long-term storage. A self-powered drive connected through USB for large amounts of storage can also be used.

The standard operating system is Raspbian, a version of Linux, but other operating systems are available on later generations of the Pi (which have improved performance because of the processor used).

Note that SE has a Raspberry Pi site.

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I connect a 5 volts to a low resistance, but I measure a much lower current than I expect

I cannot understand why the current I expect is so different from what I am measuring. I found a very low resistor, 15 ohm and connect it to 5 volts. Why is the current I measure so low? Shouldn't it be 0.333 amperes? Obviously, I am a noob, but I…
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Can raspberry Pi 3 and Lidar lite v3 connecting without resistor in circuit?

I recently try to use Lidar Lite v3 with my Rpi 3, and it works with I2C communication. My wiring method is due to offical documentation. However, what I have learned before is that the gpio pin of RPI can only afford 3.3v working voltage. My…
fevemania
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General question about memory addresses with underscore

total noob here. Upgraded to a pi 4 recently, checking the BCM2711 ARM Peripherals manual I noticed the memory addresses have an underscore, for example, the physical main address is: 0x4_7C00_0000 to 0x4_7FFF_FFF. When programing for c / asm, is…
boring
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TI 83 keyboard to USB/raspbian?

Hi electrical engineers! This is my first time posting, and I am really just beginning to explore basic concepts in EE. That said, my project right now is putting a raspberry pi zero into a ti 83. I expect it to be pretty easy, but I'm not sure how…
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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 adaptor to power my board?
IamDp
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12V power supply for Raspberry Pi

I want a small Raspberry Pi computer running off grid with a 12V, 35Ah battery and a solar panel. The current power supply converts AC to DC 12V, 1A, 12W. My question is if I cut the leads of the AC to DC converter and hook it up directly to a 12V…
SHAD
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Reading mV from the MAX31856

I am trying to use a Type-C thermocouple with a MAX31856 thermocouple IC. This means that I must read the thermocouple voltage directly (in mV) and convert the voltage to temperature in software using a lookup table. I cannot understand the…
tinker242
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Raspberry Pi GPIO Input fires random high interrupts

I have a raspberry pi 3 model without anything attached. If I configure a GPIO as input with the internal pull up resistor enabled, the GPIO reads high as expected. However, the interrupt randomly detectes raising edges. I can even cause them by…
Henning
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Powering a 14v incandescent bulb with Raspberry Pi & Transistors

I am trying to drive 14V #73 incandescent wedge bulbs using a Raspberry PI and separate GPIO pins (which run at 3.3V), combined with transistors, to control them 100% electronically. I understand the concept and why I can't run lights off of the…
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Hard on/off switch RPI with graceful shutdown

I am building a WiFI solution for a DSLR camera; so after connecting you can view the image via a webbrowser. For this I gutted a so called battery 'grip', which has buttons with which normally you can take a picture, use the scroll button for ISO…
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Raspberry Pi crashes When 3.3v or GND on GPIO connected to breadboard

I'm new to Raspberry Pi and electronics in general and I've been having trouble with GPIO. I've connected the GPIO pins to the breadboard with a ribbon, but then when I use jumper wires to connect either the 3.3v pin or GND pin to the + or -…
yascat
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PiSupply reverse engineering

I'm trying to figure out how to build my own PiSupply as my first electronics project. The schematics of the PiSupply are provided here as a PDF in the zip file, but I've reproduced the schematic to the best of my ability. My questions: Why is the…
beerbajay
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Wiring +5V to Micro USB

I'm wiring 5V from a power supply directly to a micro USB cable. I'm only using the +5V and GND connectors, and leaving Data+ and Data-. While I only plan to use the cable for power, do I need to do anything with that D+ and D- cables, or can I…
Melllvar
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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 control) installed. Today I was messing with the…
Brock Tice
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How to program Raspberry Pi tiny RP 2040

I am trying to program my tiny RP 2040 board for the first time. I have generated the uf2 file and try to connect the board via USB to have it as a mounted USB drive. However, after holding the boot button and connecting it to USB Port of my…
Bornak
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