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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0
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1answer
29 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 ...
-1
votes
0answers
31 views

Raspberry pi home automation [on hold]

I have read many articles about using a raspberry pi for home automation and being able to access it through a Web interface to control your home from anywhere. I am curious what all I can do with a ...
0
votes
1answer
54 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
40 views

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

I'd like to run my raspberry pi via solar energy. I have a 12v 20w solar panel with the following charge controller: ...
0
votes
1answer
15 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
44 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
47 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 ...
0
votes
1answer
30 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
20 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
41 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
38 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 ...
0
votes
0answers
4 views

Using a wifi adapter with the raspberry pi [migrated]

a friend of mine recently got me a wifi adapter to use with my raspberry pi, unfortunately, the driver comes in the form of a CD. Does anyone know whether I can get around this somehow? Can I get a ...
-2
votes
3answers
50 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
17 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 ...
0
votes
0answers
20 views

Raspberry PI Server [migrated]

I'm working with a 3d printer. The printer is connected to a Raspberry PI B+. I've installed Repetier Server on it. The problem is that I can't access to the server outside my LAN network (if I use ...
0
votes
0answers
7 views

raspberry pi 2 is unable to read input from PCF8591 [migrated]

I have wired according to these instructions. http://blog.chrysocome.net/2012/12/i2c-analog-to-digital-converter.html I tried the methods of getting the value at the bottom of the page and it told ...
3
votes
3answers
511 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? ...
-1
votes
0answers
20 views

Can't connect to raspberrypi.local from TI TM4C129 LaunchPad

I am using the WebClient example at TI TM4C129 LaunchPad to connect to a service running on my local network on a raspberry pi. If I use IP address of the raspberry PI as the server, I can connect ...
0
votes
1answer
39 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
48 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 ...
0
votes
0answers
56 views

How can I let my raspberry pi 3 know that my cars ignition is off using an ignition controlled 12 volt dc input with a battery in between

First of all I'd like to clarify the difference between my project and that of the "Shutdown Controller for Raspberry Pi". I only have access to the 12 volt DC ignition controlled line for my previous ...
5
votes
1answer
103 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
0answers
39 views

Interfacing Example for GT-511C3 Fingerprint Scanner and Raspberry PI 2 Model B

I want to know, how to connect GT-511C3 Fingerprint Scanner Hardware with Raspberry PI 2 Model B and will these connectors be good to achieve the same? and, I want to connect the scanner without ...
0
votes
1answer
74 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 ...
-2
votes
1answer
78 views

Wire soil moisture sensor such that it only powered when measuring

I am a rookie electronics tinkerer who wants to use the SparkFun soil moisture sensor. I plan on connecting it to ADC MCP3008 to the GPIO pins on a Raspberry Pi. On the SparkFun site the vendor warns ...
0
votes
1answer
53 views

How to control house climate system

In my house I have a climate system and I want to control the modes using RPI. I'm not very strong in electronics so my question is - How can I connect RPI GPIO to this hardware X2 switch? Like ...
1
vote
2answers
195 views

What is the quickest way to read an analogue signal - Arduino / Raspberry Pi + ADC / Arduino + ADC?

I need to sample 50Hz voltage signals from four CT current sensors and compare the waveforms to a voltage signal from the mains (stepped-down and offset for ADC) to accurately measure power ...
0
votes
0answers
81 views

Interfacing a CMOS photosensor to Raspberry Pi for low light (astrophotography)

I'm a amateur astronomer, astrophotographer & casual electronics tinkerer. I am looking to homebrew a low-light, long exposure (30s - 5min), camera prototype for astrophotography imaging based on ...
0
votes
2answers
62 views

How can I measure the supply voltage of batteris without a multimeter?

My system consists of two XBee S1s and a Raspberry Pi. I've attached a TMP36 sensor and a ...
3
votes
2answers
96 views

Different ways to detect seals? [closed]

I would like to build an underwater mammal detector to take videos of seals when they get in and out of their cave (the entrance of their cave is underwater). It will be a waterproof sealed box with ...
1
vote
1answer
68 views

Reading LM35 temperature sensor through long wire

I'm trying to read temperature through long wire, using raspberry pi. I use mcp3008 that I power using one of my rpi 5V pins. I use the same 5V pin to operate my LM35 temperature sensor. The ...
2
votes
3answers
96 views

Hardware for IP Camera Project

I intend building a custom IP camera for home use, project goals are: Videos are stored remotely in real time (storage somewhere else in home or cloud server) Live steaming from internet Video data ...
0
votes
2answers
41 views

Using Raspberry Pi GPIO for matrix switching

I'm working with a Raspberry Pi. I want to be able to connect any two of 7 pins together in a matrix fashion to control a device with a keypad input. This means I need to be able to short any of the 3 ...
0
votes
2answers
148 views

How does a 4 pin IR Object/Proximity Sensor work?

How does this IR Proximity/Object sensor work ? Any resources or tutorials on how this works would be really helpful. I want to use this for my raspberry pi NOTE : I have searched a lot on the ...
-2
votes
1answer
90 views

How to use plain 315 MHz RF Transmitter with Simple RF T4 Receiver - 315MHz using Raspberry Pi?

I bought a 315 MHz RF receiver - Simple RF T4 Receiver - 315MHz Toggle Type - and a transmitter - Keyfob Single Button RF Remote Control 315MHz, both from Adafruit. After trying some prototyping to ...
-1
votes
1answer
111 views

Programming Intel i3 like RPi [closed]

I am building a fairly large home automation system comprising of cameras and other sensors. I experimented with a Raspberry Pi, but it simply wasn't able to handle the load. Therefore I want to know ...
0
votes
2answers
86 views

Serial communucation rasperberry pi and atmega328p

I have a design system which is generate data. My system include lidar sensor and atmega328p. Atmega is driving my sensor and generate data. No problem is here. But my aim is data processing in matlab ...
1
vote
2answers
212 views

Flickering on PCA9685 PWM controller with 3W RGB LED and Picobuck

I'm hoping someone here has some experience with the PCA 9685 PWM controller (16 channel, I2c interface). So far everything is working pretty well after getting the circuit connected properly. I'm ...
0
votes
1answer
60 views

operating landline phone via mobile phone [closed]

I am making a small DIY project to operate my wired landline phone (twisted copper cable) using my mobile phone. Use cases: Dial number on landline via mobile device. Receive incoming landline calls ...
0
votes
3answers
95 views

Wire microswitch so state can be read from Raspberry gpio

I'm trying to check whether a series of valves (described here Can I measure if current is on or off in cable with 24v DC (in a cheap way)) are open or not. Updated question to be more specific after ...
0
votes
1answer
103 views

Can I ignore resistor for IR LED?

I have two IR diodes and I want to connect them to my Raspberry Pi. From Pi I have 3.3V voltage. Diodes are TSAL 6200 . Can I connect them to PNP and my PI without resistor safely with this wiring?
3
votes
2answers
148 views

Mechanical Switch in parallel to the Micro Controller working in Sync

Here is the image for my requirement,want to operate Load Lamp of 230V AC with Mechanical Switch in parallel to Controller where one can 'ON' the Load Lamp from the Mechanical Switch and 'OFF' from ...
-1
votes
3answers
95 views

Want to replace raspberry pi with something cheaper and customised [closed]

Recently I have built a project using raspberry pi, I am using the USB ports, LAN, 3.5 mm jack headphones, file system in raspberry pi. Now I want to replace raspberry pi with something cheaper and ...
-5
votes
2answers
429 views

M-Bus (Meter-Bus) Arduino / RPI [closed]

Is there some one that have manage to connect to a M-Bus (Meter-Bus)? With a Arduino or RPI? Maybe a M-Bus to serial is the way to go?
0
votes
1answer
62 views

Wireless data transmission options for streaming video

I am in the initial stages of planning a project that involves the wireless transmission of data between either an Arduino or Raspberry Pi and a base computer/RPi. Data transmitted includes the state ...
0
votes
1answer
75 views

How to determine range of wifi module

I am starting to plan a project that involves either an Arduino or Raspberry Pi (haven't decided yet) connected to a number of sensors. The unit will be located outside, battery powered and will send ...
-2
votes
2answers
123 views

Intercepting graphics card output?

I was wondering what it would take to intercept a PC's graphics card output or parts of it. First of all I'm wondering if you could even intercept the output without increasing the latency between the ...
1
vote
1answer
64 views

how can I current-limit a Raspberry Pi 2 USB host port so phones/tables do not try to charge

Although my use case is specific to Raspberry Pi, I think the question is a general USB Host port question. When a phone/tablet (especially iphone and ipad) is connected to a Raspberry Pi 2, if its ...
0
votes
2answers
90 views

Optocoupler w/ RasPi & Door Buzzer

I'm currently trying to make a system where sending a message to my Raspberry Pi from my phone will send a signal to my apartment's buzzer to open the front door, however I've been having problems ...