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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40 views

Using Raspberrypi to measure power consumption

I am looking to use the raspberry pi 2 to measure the power consumed by household appliances. I know that the pi does not have an inbuilt ADC. I found that the MCP3008 can be interfaced with the pi as ...
0
votes
1answer
18 views

RF Receiver for 433mhz and 315mhz?

I have a XD-RF-5V receiver wired to my Raspberry Pi listening with RFSniffer (433Utils). I also have a XD-FST 433.92mhz transmitter wired to my Raspberry Pi running codesend (433Utils). I can ...
0
votes
4answers
75 views

Switch from 3.3V to 24V Raspberry Pi

I want to convert the Raspberry Pi's 3.3V output to 24V as this is what the I/O uses on the Universal Robot arm, UR5. The 24V is supplied by the UR5 and so I thought that a simple NPN transistor would ...
0
votes
1answer
18 views

ad5359 address not shown

I am working AD5259 , its a digital potentiometer. Its connected to i2c bus on raspberry pi. But the address of device is not shown. Datasheets says its 0X18. I guess the device does not respond to ...
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votes
0answers
14 views

RPi prototype design (camera, thermal printer, display and button) [migrated]

I want to create a prototype using a RaspberryPi model B+. I created a list of the things I think that I'm going to need. I need the following modules connected to an RPi: a camera a thermal ...
-1
votes
1answer
40 views

Detect open or closed circuit via USB sensor

I have a relay which I need to detect the state of (similar to this question but no current flow) and would like know what the easiest method would be to detect the state via USB and Raspberry-pi. I ...
0
votes
0answers
109 views

Raspberry PI PWM Common Anode 5v 12v Lamp Circuit

i'm not an Electronical engineer, i prefer to write codes. But lately (since about 2-3 months) i finally had the balls to connect something to the raspberry PI's gpio. Two days later i already tested ...
0
votes
0answers
28 views

How to power multiple different LED light strips with a single adapter [duplicate]

I am building a fun electrical project soon using up to 16 LED light strips and I am having worries on either breaking them or under-powering them. The project takes in MP3 audio files and uses a ...
0
votes
0answers
45 views

How can I interface a Raspberry Pi with a bare Atmega128

Currently in this project, I have an Arduino Uno controlling some low-level hardware, which interfaces to software running on a Raspberry Pi via the Arduino USB cable. I'm looking to shrink the ...
-1
votes
0answers
5 views

raspberry camera [migrated]

i have tried to use a raspberry in order to to some time lapse recordings with an old webcam, after some research i found ouit it wasnt compatible. I have a playstation eyetoy and read it was ...
0
votes
1answer
39 views

Drive relay with Npn transistor thanks to RTC and Rpi

It' s my first projet in electrical and i m not very sure about what i'm doing ... I Would like to drive a relay thanks to a Rpi and a RTC clock that has a alarm feature ( ds3231 with high-z/active ...
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votes
1answer
41 views

How can I relay 120VAC with a raspberry pi?

I have five 75W 120V AC LED lamps on a dimmer switch. They draw 13 watts each (375W total). I also have a 600W Lutron dimmer switch hooked up but the thing buzzes when the lights are dimmed. I also ...
0
votes
2answers
49 views

74HCT244 UART level translator, how would the circuit look?

I am building a UART 3.3V to 5V Level translator between a Raspberry Pi and a ATMega328. The 74HCT244 is my choice of translator but I can't find a good example of of hooking it up. Am I right that ...
-1
votes
0answers
35 views

What is the Raspberry PI GPIO 3.3V tolerance Percentage

I am building a test jig to test my Raspberry Pi extension board and one of the tests is to check that the UART 3.3V levels shifter are within tolerance. The tester uses a Arduino Nano with one ...
0
votes
2answers
111 views

Simple transistor circuit

I have been studying transistors and decided to try my knowledge in my lab to find out that nothing works as I thought it would.. I had a small lamp 12V and a handful of 2N3904 transistors, along ...
-3
votes
2answers
74 views

Controlling a DC motor directly with Raspberry Pi GPIO without any external IC or Transistor

I need to control a DC motor without the use of an external IC or transistor with the raspberry pi GPIO. I do not need direction or speed control. All I need is the motor to controlled by raspberry pi ...
0
votes
1answer
49 views

How to use 2 power supplies in transistor key?

I have 2 power supplies in my scheme, one is from Raspberry Pi GPIO and one is 9v battery. I need GPIO output to work like a button, e.g. when output from GPIO is 1, battery should power the scheme ...
0
votes
1answer
45 views

How to use 2 power supplies in my scheme?

I am building a device to send a signal from Raspberry Pi GPIO to a vibration motor. Here is how it should work: the RPI outputs 0v or 3.3v, and when it outputs 3.3v, the vibration motor should ...
1
vote
1answer
70 views

I2C: How to connect Raspberry Pi (power cut) to ATmega328p

I would like to interface a Raspberry Pi with an ATmega328p microcontroller using the I2C bus. These two parts act both as masters, but not at the same time. The Raspberry Pi is powered through the ...
1
vote
1answer
106 views

Burning out relays when supposed to be within ratings

I am using this Normally Closed Relay on a 24V circuit: DataSheet The circuit is 24VDC source, which I measured the Amperage in series to be 29mA at the highest. I've breadboarded a lower voltage ...
0
votes
1answer
40 views

Sprinkler Control Power supply requirements questions

Not sure if this is the right forum or not... I am looking to build a custom sprinkler controller using a Raspberry Pi and a relay board. The question is around the power supply. The valve ...
0
votes
1answer
127 views

How to share a VCC and a GND across to multiple relays

I'm working on my first electronics/Arduino project to control two pairs of motors. Currently, the motors are controlled by a simple four-button, wired remote controller, where each button controls a ...
0
votes
3answers
62 views

Liquid throughput hall sensor giving odd number of pulses plus only works in horizontal level

I'm an IT guy, but have lately started working more and more "on the edge" as we say, so close to the real world and with low level sensors. I'm currently building a liquid throughput sensor and ...
4
votes
2answers
58 views

Design Considerations for Raspberry Pi Expansion Boards

I am venturing into the space of designing expansion boards for Raspberry Pi's. I have done this for Arduino boards but RPi's are a different beast. From personal experience I have already had ...
0
votes
1answer
37 views

Raspberry PiFace, need to put 14 gauge wire in 1.5mm terminal

I have a PiFace and I need to get at 14 gauge wire which is 1.63mm thick into a 1.5mm screw terminal. To pass 4 Amps at 24VDC. I only have 14 gauge and 22 gauge wire, the 22 gauge wire won't pass all ...
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votes
0answers
40 views

Reading analogue input using digital GPIO

I'm using soil hygrometer to measure soil moisture. Since I don't have adc I'm using This method. Please tell me how to connect resistor and capacitor along with amount of resistance and capacitance. ...
0
votes
1answer
68 views

Why are corresponding USB datalines connected to each other in this USB hub?

Background: this is (I think) effectively a USB hub, with built in ethernet. This is the circuit as it is being used in the Raspberry Pi B rev. 2 The USB+ from the upstream port (0) is connected to ...
0
votes
0answers
15 views

Reprogrammable Remote Power Supply Raspberry Pi Monitor and Control

I currently have a reprogrammable power supply (HCS-3400) hooked up to be controlled remotely from an control/monitor app provided by the power supply company, Manson. The supply is connected via USB ...
0
votes
0answers
29 views

Fuse header for GPIO pins?

I have recently gained interest in electronics & tinker with Arduino & Raspberry Pi. But I made some big mistakes & ended up frying my board with mains AC supplied to the GPIO :( (yes, I ...
0
votes
1answer
28 views

L293ne wireing help

First real project in many years so please accept my apologies of this is a silly question. I want to use the L293 to drive a motor (or 2). Using a raspberry pi which I have done using the add on ...
2
votes
2answers
64 views

GPIO Input fluctuating between high and low when no input is received

I posted this on the Raspberry Pi StackExchange but I feel as though it might be better suited for here, as the SE is pretty inactive anyway. I've got a fairly simple circuit that I've made where a ...
0
votes
1answer
31 views

Acquiring and fusing data from different controllers

TL;DR: What are some options to fuse data acquired with separate controllers? I'm developing my own IMU for a quadrotor. My inputs are an accelerometer, gyro, magnetometer, and barometer all via I2C ...
0
votes
3answers
79 views

Brown Out Problem in Raspberry Pi Over Power Tether Cable

I am in the middle of making my own ROV with six DC motors as the thrusters. The main controller inside the ROV is a microcontroller that is connected to Raspberry Pi that can send and receive ...
0
votes
1answer
151 views

RPI with power supply alternating between Li-ion battery pack and DC 5V

I have a Raspberry Pi model B+ and I've been trying to design a solution so that I can switch power supply without having to shutdown. The idea is this: I have 2 li-ion 18650 batteries with ...
0
votes
1answer
63 views

rasperry pi with i2c arduino leonardo

I'd like to connect a Raspberry Pi A+ with an Arduino leonardo. I'd like the rapsi to be able to upload HID sketches on the arduino.Then I'd like the arduino to run the sketch over the USB interface ...
0
votes
1answer
82 views

433Mhz Receiver Low Range Only on Raspberry Pi

I have an Arduino mini pro with a 433mhz receiver attached. I connected this to my computer via a usb to serial cable. I've tried it on two laptops ans it works fine with it (>15 metres), but when ...
0
votes
1answer
58 views

DIY Photobooth: LED puck lights potentiometer suggestions

I'm building a Raspberry Pi powered photobooth, and want to add some lighting. I purchased this set of led puck lights, and would love to control their intensity from the Raspberry Pi, instead of the ...
2
votes
1answer
212 views

Magic number in ADC Pi code

Im trying to measure temperature using PT100. Im using ADC Pi board for that. ADC Pi uses MCP3424(pdf datasheet) A/D converters, and in datasheet I found how to calculate voltage - it is pretty simple ...
3
votes
2answers
345 views

Industrial equivalent of rapid prototyping hardware

If I want to automate something at home, I can use a Raspberry Pi or Arduino to hookup some sensors and put the business logic on the chip. Internet-of-Things-style, I can even read those sensors on ...
3
votes
3answers
720 views

how to increase the voltage of a digital signal?

I'd like my Raspberry Pi GPIO port to communicate with a digital circuit that works at 2x the GPIO voltage. The communication will be at a relatively high frequency (up to 500kHz). The main question ...
2
votes
2answers
89 views

Is this the behavior of a broken mosfet?

I designed this circuit to switch on/off 8 solenoid valves for a programmable dancing fountain that I am building. The GPIO is coming from a Raspberry Pi. VCC is coming from a 12V deep cycle car ...
0
votes
3answers
88 views

Power Circuit for Raspberry pi portable

I am building a hand held portable raspberry pi. I have just plugging the battery in and using the thing, but I want to make the battery completely part of the unit without the need to unplug it when ...
1
vote
2answers
258 views

How do I work out what resistor to use?

I am trying to work out what resistor to use in a circuit. The circuit is a series circuit. The power to the circuit is 5.5V, with a switch, which connects to a GPIO pin on the RasberryPi. I believe ...
0
votes
1answer
79 views

Raspberry Pi B+ with relay: Lights change but relays don't click

I am using an 8 Relay module, bought from dx.com. It has no instruction manual... This board has 8 inputs (IN1,...,IN8) to control each relay, 1 VCC pin that requires 5V and 1 GND pin. I connected ...
0
votes
1answer
60 views

Controlling an ESC for Brushless Motors with an RPi

Originally posted on Robotics, but guess it's not active enough. I'm looking to build a new (first) quadcopter without the conventional flight controller and radio, with an onboard RPi and applying ...
0
votes
1answer
52 views

PoE Lower Signal Voltage

I'm currently working on a little project using a Raspberry Pi and an Ag9000-S. I've got it working using Mode A (phantom power over the data pairs) and Mode B (direct power over unused pairs), but ...
0
votes
0answers
74 views

RFID race timing system using raspberry Pi?

I would like to build a race timing system using UHF RFID passive tags. I have seen self build systems described as per the following link which is being used in races with apparent success: ...
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votes
1answer
39 views

ADC ic's for SPI protocol [closed]

I want to know what are the ADC Ic's is suitable for SPI protocol? because i cant find MCP3008 ic in shops? No one having this IC. Thanks.
0
votes
1answer
52 views

Darlington does not switch

I have a darlington Transistor circuit. Like in the schematic i attached. When i power up the 3V3 from my raspberry, the led is not on. When Doing Danke same with 12v instead of 5v, it Works ...
-1
votes
1answer
65 views

DH-11 Sensor on a Raspberry Pi & Arduino

I am trying to make my DH-11 sensor work on my raspberry pi but I have not succeeded after several attempts. I followed the following tutorial from Adafruit: ...