For questions dealing with devices that measure the physical world around us and translate it into signals for the Raspberry Pi.

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Raspberry Pi 2 : DHT11 : Oracle Java ME Embedded

Anyone integrated DHT11 temperature sensor on Raspberry Pi2 with Oracle Java ME Embedded system? Any direction will be helpful.
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1answer
27 views

cron job for gpio 1-wire sensor fails at 17 minutes past hour

I am developing on a Pi 1B some work with 1-wire sensors - using my own software. My application is running as compiled C - bit-banging the GPIO. On the current setup I have a single sensor on gpio 17 ...
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27 views

RPi 2 B+, node.js and Hall Effect Sensor

New to forums.. looked around for the answer to my question but have not been able to find anything.. I am trying to write a REST API but first need to get node.js to see my Hall Effect Sensor ...
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26 views

Recording a wav file using a GPIO Microphone sensor

I have connected an analog sound sensor to my raspberry pi via an Analog-To-Digital-Convertor (MCP3002), a breadboard, and a whole bunch of wires (dupont cables). I have successfully tested the ...
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18 views

MCP3008 with photoresistor, I get reading but what is a cut off point for normal light

Hi I have been doing a project regarding Raspiberry Pi with multiple sensors, I done my read up but for photoresistor(the one in Arduino starter box) with MCP3008. I know that I will get a reading ...
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1answer
28 views

Questions about wiring raspberry, l298n, SG90 and HC-SR04

I've finished testing and mounting my hc-sr04 and sg90 and now i have to connect everything, but have doubts and questions. Here are the diagrams that show what I am thinking to do: This one shows how ...
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33 views

Light Sensor project

Perhaps this has already been done and if it has, please post the link in the comments. I am developing a python script that will run on the Raspberry Pi that also has a light sensor connected to it ...
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1answer
95 views

How to use the water flow sensor with raspberry?

I'm trying to use this water flow sensor with raspberry: https://www.adafruit.com/products/828 I'm using this python code to read the pulses: #!/usr/bin/env python import RPi.GPIO as GPIO import ...
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1answer
26 views

Does RB URF02 ultra sonic sensor give false readings?

There's only 1 raspberry pi shop in my country and he offers only two ultra sonic sensors HC - SR04 and RB URF02 there's a pdf on the pages I linked to for more information. RB URF02 is so much more ...
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11 views

Is there a bluetooth device for distributing remote GPIO devices?

In a project I am working on, the distance between my Pi and the location of the various sensors is quite far (>20m), so I was wondering if anyone knows of a small bluetooth beacon-style device which ...
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1answer
61 views

Communicating with a Raspberry Pi that is underwater ? [closed]

Is there a way, that I can communicate with a Raspberry Pi, that is underwater. The depth of the Raspberry Pi will be about 20 meters or less. I was thinking of using Bluetooth, or 433Hz RF ...
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3answers
39 views

Temperature Sensor for use with Nagios

I have my Raspberry Pi 2 running Nagios 4 in a small HiFi cabinet which I have converted into a rack of sorts, and would like to monitor the temperature of said rack. Ideally I would like to not have ...
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1answer
42 views

How to send data back and forth between the Pi and a C# application on a Windows PC

I want to connect the Raspberry Pi to a few sensors and motors and then control it via a C# application I have written. After it has carried out the operation I want the Pi to send back data from the ...
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1answer
113 views

How to use JSN-SR04T on a Raspberry Pi?

I want to try out JSN-SR04T, which is an ultrasonic distance measuring module, that is also supposedly water proof. The main reason that i want to try this module over the HC-SR04, is because the ...
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24 views

Wireless Reed Sensors

I want to connect a Raspberry Pi wirelessly to 2 read sensors, and Sensor - Reed Switch XRF development sensor - RS and Slice of Radio - Wireless RF Transceiver for the Raspberry Pi look like what I ...
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1answer
76 views

Cannot get ultrasonic sensor HC-SR04 to work(maybe I broke it with wrong wiring?)

I am trying to measure distance with HC-SR04 and Raspberry Pi A+ using Python on Raspbian. So here is how it is connected: VCC - to the 5V Out from L289N motor driver GND - to GND on the L298N motor ...
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7 views

How can I install the KY-001 temperature sensor on my Raspberry Pi 2 B? [duplicate]

I'm a beginner and know basically nothing about Raspberry Pi. Recently I bought a sensor kit and a breadboard, but there are no tutorials for them. So how can I, for example, install a temperature ...
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2answers
241 views

How to read Analog 5V sensor ouput with Digital 3.3V GPIO?

I bought the "Sunfounder Sensor Kit" for Raspberry Pi 2, but the whole content is made for Arduino (5V). I have bought ADC, Level Shifters but I am stuck because I think I certainly miss a simple ...
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1answer
84 views

How to use E18-D50NK on a Raspberry Pi?

I have one question . I want to try out a sensor called E18-D50NK, which is a infrared proximity sensor, for obstacle avoidance. More details and information about this sensor can be found here : ...
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1answer
131 views

BMP180 wrong reading

I connected my BMP180 on Raspberry Pi, temerature reading is correct, but pressure reading is incorect. It says Pressure=100448.00Pa, Sealevel Pressure=10450.00Pa while my local weather station says ...
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2answers
113 views

Is this possible to read internal CPU temp sensor directly from cpp code?

I am working on the kind of RPi platform to collect some external sensors data or control relays (using the remote tools like web or sms). Next problem I am tring to solve now is to get the direct ...
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1answer
255 views

LM35 temperature sensor not listed

I followed this guide: http://www.cl.cam.ac.uk/freshers/raspberrypi/tutorials/temperature/ to setup a LM35 temperature sensor on my Raspberry Pi. Changed the raspi.list file as well to deb ...
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3answers
824 views

Can I use the 3.3v pin instead of the 5v pin?

I am using a HC-SR04 ultrasonic sensors, and I don't have enough 5V pins on a Raspberry Pi, and I don't want to buy an expander. So is it possible to use the 3.3V pins on some of the sensors? What ...
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2answers
98 views

Is the Raspberry Pi suited for sensor and voice recognition project?

I am going to do a project in which the user moves his head in order to control the cursor across the computer screen using accelerometer sensor and gyroscope sensor (not combined). And for the mouse ...
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1answer
70 views

Measure the frequency of a 555 timer

I try to design a moisture sensor for the Raspberry Pi. To get a more stable measurement my idea was to use the 555 to generate a frequency depending on the capacitance. The circuit looks as follows: ...
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1answer
35 views

IOError exception not handled within signal handler

I am usig a RPi as a datalogger for an accelerometer, the ADXL345 breakout from Sparkfun. Since I need the accelerometer to sample at an exact frequency of 200Hz, I am using a signal to trigger the ...
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1answer
77 views

Vibration sensor / accelorometer capable of measuring vibrations caused by trains passing by

We live pretty close to the rail tracks, and for a long time I wanted to create a system that is capable of measuring the vibrations of the trains passing by. I tried to do it using the Sudden Motion ...
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1answer
52 views

Raspberry Pi Rapid Development Shield-Atlas Scientific-Reading Two(2) Sensors at the Same Time

Has anyone tried to use Atlas Scientific Raspberry Pi Rapid Development Shield: Can this shield run two(2) sensors at the same time(i.e., Thermometer probe and pH probe) and read both inputs? here ...
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0answers
9 views

GY-521_MPU6050 i am interfacing with LPC1768 the device is not recognized [duplicate]

I am not getting the raw values from gy-521_mpu6050 values .i connected scl,sda,ad0(gnd), vcc(5v),gnd. but i didn't connect the INT pin.i check the no_pull_up and operating frequency .if i want ...
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1answer
35 views

Powering via a motion sensor using a battery pack

I'm new to Raspberry Pi and I had a few questions. I want to connect a raspberry pi to a e-ink display, it will retrieve content over wifi. It will only display when a motion sensor picks up on light ...
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1answer
78 views

Raspi Type B with MQ sensors (updated)

Is there any other way to integrate raspberry pi with mq sensors?? I've been successful with one mcp3002 and one mq-2 sensor but is it possible to add another mq sensor (mq4,mq6) and should i provide ...
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5answers
121 views

How do I retrieve data from another Pi on the same network?

I would like to combine two tutorials (here and here) that I have found on sensing temperature with Raspberry Pis. I am already able to retrieve the temperature from the DS18B20 on multiple pis. ...
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0answers
58 views

Pi getting data from XinoRF

I'm trying to get the data from a DHT11 sensor connected to the XinoRF board. But it seems I get nothing from the wireless port ttyAMA0, but when I use the USB port ttyACM0, the python program seems ...
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1answer
209 views

Understanding the library from MCP3002 ADC chip

can somebody explain to me about this mcp3002 library used in analog to digital conversion?? It has some connection to my first question here. # botbook_mcp3002.py - read analog values from mcp3002 # ...
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1answer
600 views

Problems Regarding Raspberry Pi Project with MQ-2 Gas Sensor

Recently I have been learning Python implementations on Raspberry Pi's GPIO system. I'm interested in wireless sensor network examples and decided to make a fire alarm system using MQ-2 sensor as the ...
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2answers
116 views

Soil hygrometer without adc

I want to measure soil moisture using THIS sensor. I do not want to use ADC. In the sensor there is a digital output port and an analogue output port. I can use the digital output of the sensor ...
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1answer
50 views

dt11 is not detected on raspberry pi 2

I am trying to setup dt11 sensor using T-cobbler but its not getting detected. For reference attaching the screen shots. Any help really appreciated :) Thanks, sushanth
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2answers
345 views

Python taking pictures with raspberry pi camera

I have written this code to take a picture when it detects motion however when I run the code it prints 'picture taken' but does not save the picture. I know my camera works as I tested it in LX ...
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1answer
104 views

Wirelessly transmit sensors status

I am currently working on a home automation system and one of the challenges is big distances between my sensors and the the Raspberry Pi. For instance, I would like to monitor two rooms with PIR ...
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2answers
53 views

Detect stall current from motor and send gpio signal

I have a project which has a 12 V DC motor controlled by a raspberry pi through a l293d. The motor draws about 600-800mA from the power source while it is running, and > 1A (much greater) when it ...
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0answers
30 views

How to hook multiple SR04 Ultrasonics without soldering or using resistors / parts

What hat would be appropriate for attaching 3-5 Ultrasonic sensors like the SR04? For this question, assume I have to use a prebuilt 4-pin F-F dupont style connector.
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2answers
178 views

Resetting I2C? Or did I break my chip?

I'm connecting a TS45315 light sensor on an Adafruit breakoutboard to the I2C bus of my Raspberry. I access the data through the following simple Python script: ...
2
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1answer
387 views

Do I need a current limiting resistor in series with a magnetic door sensor?

I'm building an alarm system and I'm using a magnetic door sensor, conected to ground and a pin of the gpio set up with an internal pull-up resistor. As far as I know, this means that the pin will be ...
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1answer
120 views

433 Mhz transmitter on RPI always sending 00000000

I've bought a Realtek RTL2832 DBV for my RPI to read 433 mhz data and a transmitter HM-T433. I can successfully receive messages from two 433mhz remotes with the rtl_433 utility, but when I try to ...
2
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1answer
181 views

DS18b20 temperature sensor not found [duplicate]

Trying to install DS18b20 temperature sensor but it looks like the RPi cannot find it. From console: sudo modprobe w1-gpio sudo modprobe w1-therm cd /sys/bus/w1/devices/ ls But there is nothing ...
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39 views

Ultrasonic Sensor isn't consistent

I setup ultrasonic sensor on B+, following instructions given in this video. But each time I test I get a different distance for the same object which hasn't moved, seems like it decreases every time ...
2
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1answer
199 views

Accessing ADXL345

I'm trying to access an ADXL345 Accelerometer mounted on a Sparkfun breakoutboard via Python and I2C from a Raspberry B+. I'm following this tutorial However when trying to check for the sensor with ...
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2answers
239 views

Building a Raspberry Pi network monitor. My code is not working

Long story short. I moved, put my home server is a closet and started worrying about temp and humidity, saw a guide online to make a network temperature and humidity monitor from a rasberry pi and an ...
3
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1answer
112 views

Emulation of the Raspberry Pi with sensors

I am trying to emulate NOOBS or some other Raspberry Pi distro. I have tried QEMU but unfortunately this does not simulate peripheral devices (eg. Sensors) I was wondering if it was possible that a ...
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2answers
2k views

How to hook up an AM2302 temperature & humidity sensor several feet away from the Raspberry pi?

I have a raspberry pi running pipgio and am using the provided code under the python section to get the temperature and humidity reading from the AM2302 (http://www.adafruit.com/products/393). If I ...