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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2answers
11 views

Raspberry Pi + IRFZ44N to control a 5050 RGB LED strip: current seems to be limited

Introduction and General Question: Scalability I have assembled very simple circuitry to successfully control one RGB LED strip. I have also managed to improve slightly its yield. However, when I ...
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0answers
11 views

Repairing Raspberry Pi 3 [on hold]

I recently fried my Raspberry Pi 3 by powering it with a UBEC over the 5v rail by the GPIO. Although it worked for a couple weeks it suddenly failed and my Pi would no longer boot with the UBEC over ...
0
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0answers
38 views

DIY Pixelvision-Type Camcorder?

Preemptive warning: My knowledge of electronics is fairly basic, so please understand that I'm still learning (aren't we all?) so I may not have a clue what I'm talking about. For the past week or so,...
0
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1answer
28 views

RPi Pressure Sensor using Piezo Transducer

I am trying to make a pressure sensor to use with my raspberry pi zero. I would like to avoid making another purchase, so while an ADC or FSR would be easier I would like to figure this method out. ...
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2answers
78 views

Auto shutdown and start of Raspberry Pi (remote application) using powerboot 1000c - need help debugging the circuit

In my application, the raspberry pi (A+) is remotely located and is powered using Powerboost 1000c. The powerboost is connected to a battery (lipo) and a solar panel. The battery is rechargeable and ...
1
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3answers
122 views

Raspberry pi super capacitor power supply

I'm trying to make a simple ups for a raspberry pi dash cam. The goal is to provide power to the pi for about 10 seconds after the car has stopped running. When the power supply turns off, the gpio ...
0
votes
1answer
82 views

Current limitations of a MOSFET [closed]

I am using IRFZ44N for supplying current to the RGB LED strip. The current that is supplied by the three MOSFETs for the three corresponding colors (R-G-B) is not uniform and much less than required ...
0
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0answers
6 views

How to connect such display to raspberry pi gpio? [migrated]

I'm a newbie to electronics and recently found a transparent oled and want to connect it to a raspberry pi as a screen. How do I do that? There's the link to the display specifications: https://m....
2
votes
3answers
96 views

Getting a more stable signal on very long strips of adressable RGB LEDs

I need to drive a 12m strip of APA102 RGB LEDs (144 per meter). I use a Raspberry Pi for this Job. This LED driver IC (APA102) takes an SPI signal and hands it to the next LED in the series and so on....
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0answers
39 views

Powering USB hub via batteries causing problem

First of all sorry for bad english, secondly I am noob when It comes to electronics. What I am trying to do: I am trying to connect multiple mobile phones to Raspberry Pi via USB hub. Naturally I am ...
0
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0answers
57 views

ESP8266 - 01 blue led stuck on with nodeMCU firmware, LED control worked before

I'm using a ESP01 for my experiments. I installed a nodeMCU firmware on it using a RaspberryPI: And I connected a serial with it in baud = 9600. All ok. Then I use two leds for led blink: It's ...
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vote
2answers
63 views

P-channel MOSFET with variable resistance on the drain

I would like to switch a variable resistance using a P-channel MOSFET as a high-side switch. I asked a similar question here using PNP BJT; however, it appears as though a BJT would be inappropriate ...
0
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1answer
115 views

Help With My Motor Controller Circuit Diagram

I'm a novice when it comes to electrical engineering, primary since I'm a programmer. However, I am trying to make a drone for fun and I made a really(REALLY) basic motor controller with some NPN ...
0
votes
1answer
40 views

Calculate base resistor of PNP transistor in switching circuit with variable resistance

I would like to read analog input on my Raspberry Pi using various resistive sensors I represent in the schematic below as potentiometers (R5 ad R7). I need to be able to switch the circuits on and ...
0
votes
2answers
52 views

How can I close a remote controller switch with an optocoupler and a Pi?

I'm trying to close the contacts of a remote controller (wires are soldered to either side). I have an RPi and I'm yet to buy an optocoupler. What would I need to get this to work? A Pi outputs 3.3v ...
1
vote
1answer
55 views

Smart Phone's camera socket

I just want ask how the socket in the image is called? I couldn't really find and the closer I could get is only Raspberry's module.
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0answers
44 views

Best and Simplest component for switching

I have a SIM 928 that has 4 pins for serial rx/tx. One set is for GSM and the other is GPS. On raspberry pi or micro controller, I only have one set. What is the best component to use to switch from ...
1
vote
1answer
37 views

Best way to make connection with rubber contact pad

I dismantled a push-button telephone and I am want to control it using a Raspberry Pi (A+) to trigger the button presses. The phone has a grid of 12 (+2 special buttons) contacts that correspond to ...
0
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0answers
16 views

What's the best way of using LiFePO4s in a UPS?

I have built a server using a Raspberry Pi and a couple of USB HDDs. The HDDs are 3.5". The server system also includes a network hub and a router, so I need 5 V @ 2A for the Pi, and 12 V @ 4A for ...
0
votes
1answer
46 views

Powered USB hub

I would like to know if the bellow montage is going to work. I will try to convert a cheap USB hub for a raspberry pi zero.
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3answers
54 views

RaspberryPi + FET LED lighting controller

I'm attempting to control an LED Lighting Strip from a RasperryPI GPIO pin. I have the following setup: simulate this circuit – Schematic created using CircuitLab This is the diagram ...
0
votes
1answer
30 views

Why dc motor is buzzing when using it with XL6009 converter?

I have the following scheme RPI, L298n with 6v DC motor. I'm trying to add a XL6009 boost converter but set to boost 5v into 6v but sometimes the motor is rotating and sometimes is buzzing. Does this ...
0
votes
1answer
41 views

Senseo & Raspberry PI soldering circuit board

I am kinda new to the whole hardware stuff and as an amateur I am working on a little project. I would like to connect my senseo machine to my Raspberry Pi. I've got a senseo HD7810 and a Raspberry Pi ...
1
vote
1answer
70 views

Battery charger with load sharing for portable Raspberry Pi 3

i'm doing portable Rasberry Pi 3 and i need help choosing the right battery power system requiered for the project. The project has: Raspberry Pi 3. Normal power consumtion around 700 mA with peaks ...
0
votes
2answers
88 views

Raspberry Pi controlled power on/off switching of an Ethernet connection

I want to power on/off an (Gigabit) Ethernet connection physically by using some circuit. The main idea was to use a transistor with the Raspberry Pi GPIO to switch an Ethernet cable. The schematics ...
-3
votes
1answer
73 views

Pinout diagram of Lora SX1272 RF board module

I already bought Lora SX1272 and Arduino . I would like to connect Arduino with Lora SX1272 RF board module. However, I couldn't find the pinout diagram of Lora SX1272 RF board anywhere. Could ...
1
vote
1answer
52 views

Using AC relay with DC voltage

I apologise in advance if this is the wrong forum, or I'm not providing enough details. I'm building a thermostat zone controller on a raspberry pi and I've encountered an issue with the relays in my ...
3
votes
1answer
40 views

CE and FCC for MCU boards/Raspberry Pi HATs/Arduino shields etc

There doesn't seem to be a great deal of information on the internet about this (and the information that there is is usually contradicted somewhere else), so I'm going to ask this here, in the hope ...
0
votes
1answer
148 views

Have Cell Phone Display Panel(s) been hacked to accept HDMI?

Cell Phone Displays are cheap and have high-resolution and touch sense, but use varied specialized inputs via ribbon cable. So, has the DIY community made any controllers to input HDMI? What about the ...
0
votes
1answer
64 views

How to create a network of multiple xbee s2 with python and arduino

I'm working on a wireless sensor network in which I have one coordinator router (API mode 2) connected to a Raspberry Pi 2, 5 or more routers in API mode 2 as well. Each router is connected to an ...
0
votes
0answers
35 views

Relay module not working

I bought this relay module and I tried connecting it to my raspberry pi. I attached the Vcc (one next to the inputs) to the 5v rail of the pi and gnd to gnd. I attached the input pins to various gpio ...
0
votes
1answer
71 views

MCP3008 reading wrong values

I'm currently using an MCP3008 ADC with Raspberry Pi and interfacing them with the wiringPi library. To test the MCP3008 was reading the values properly I set up a voltage divider with a 100kΩ ...
0
votes
1answer
48 views

Which battery to use to charge from 12v solar and supply raspberry pi [closed]

I'd like to run my raspberry pi via solar energy. I have a 12v 20w solar panel with the following charge controller: https://www.amazon.co.uk/gp/product/B0197ZNWLM/ref=oh_aui_detailpage_o00_s00?ie=...
0
votes
1answer
31 views

circuit explanation for detecting different gases by mq2 with raspberry pi [closed]

I am able to get the readings from mq2 sensor but don't know how to detect different gases by it. Can anyone help me in getting the circuit explanation of detecting different gases by using mq2 ...
0
votes
1answer
54 views

home automation with arduino, raspberry using externally powered relay board

I have a plan to put together small home automation system. For now I was just playing with smaller parts like single type of sensors at once etc... I would like to ask for opinion & check of my ...
1
vote
2answers
71 views

charge 5v battery with 12v solar panel

I've a 5v 2200mAH battery and a 12v solar panel and charge controller. Is there any danger in charger my battery from the 12v panel/controller? The batter will then power my raspberry pi zero micro-...
0
votes
1answer
44 views

Getting Raspberry Pi or Arduino to control three clock hands separately

I want to make an analog subway countdown clock. The idea is to have an ordinary clock with three hands. These hands will point to the number of minutes before the next, second next, and third next ...
0
votes
1answer
40 views

My BeagleBone Black does not turn on other than power LED turns on for a second

The power LED just turns on for a second and turns off. I again tried with power adapter (5V 1A) and the mini USB cable but nothing else happens.
0
votes
1answer
50 views

pwm amplifier with npn bjt

I'm trying to do a pwm amplifier in order to control 3 fans with one pwm signal. Since there are three fans and according to the pwm specs allowed current per each is 5-8mA, I expect current load of ...
0
votes
1answer
47 views

Raspberry Pi 2 to arduino RF Serial link with USB to Serial TTL Converter

This is my first question here. I want to have a communication channel which will use a 433 MHz RF TX-RX pair. I want to use a Raspberry Pi 2 as a transmitter and an Arduino Mega as a receiver. Is it ...
-2
votes
3answers
62 views

Powering Raspberry Pi and servo motors from a single power adapter

I want to use a single power supply for a Raspberry Pi and 2 servo motors. The servo motors require 6V for operation and their cumulative current consumption does not exceed 1A. The Raspberry Pi runs ...
0
votes
1answer
23 views

What does short circuiting a RST front IO header do?

My motherboard has a connector to enable the use of a front panel RESET button: I would like to simulate the press of the button (equivalent to short circuiting the wires) by a Raspberry Pi, by ...
3
votes
3answers
539 views

How to convert 14V AC to 5V DC?

My interphone's buzzer receives an AC voltage of 12V. I would like to substitute this buzzer with an embedded board (raspberry-pi). What would be the ideal way of converting such voltage to 5V DC? (...
0
votes
1answer
42 views

How to lower volume on microphone input before outputting through headphones? (Using a DSP) [closed]

As part of a senior engineering course, my partner and I decided on tackling the problem of hearing loss in youth, and went with a more preventative approach, trying to reduce the amount of cases ...
0
votes
1answer
71 views

LED strips controlled by SN3218

I have 6 RGB LED strips and I would like to control them by Raspberry PI. 6 strips with 3 colors each require 18 controllable PWM sources, so I have SN3218 which is exactly what I need. But I am not ...
0
votes
1answer
41 views

Multiple signals over single RJ-45 cable

I need to set up a Raspberry Pi system with remote storage, but only have access to a single RJ-45 cable. This limitation is so the system may be replaced in the future, without having to change the ...
5
votes
1answer
237 views

Understanding an 'ideal' diode made from a p-channel MOSFET and PNP transistors

The Raspberry Pi B+ models have a protection circuit between the USB connector and the 5V net on the board. They recommend putting a similar protection circuity on a Pi HAT before 'backpowering' the ...
0
votes
1answer
150 views

Help SIM5320 Breakout Board construction for Raspberry Pi model B

I need a breakout board based on SIM5320 for experimenting web server http requests. I've found the board shown above in adafruit library and thought of using it as reference and slim it down to the ...