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Questions tagged [measuring]

The tag has no usage guidance.

1
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1answer
31 views

connect 4 measuring devices output to a raspberry and set a Pin high if value exceed a particular value

I have a special measuring system. Each measuring unit gives PWM output (total 4 outputs). Maximum frequency will be 10Khz (for each output). I wanna measure the frequency of each PWM evey second ...
0
votes
1answer
32 views

Raspberry Pi 2 power consumption incorrectly

Before, i'd a problem about changing governor for my Pi (cpu always stays at 600Mhz in every mode), after doing some tweaking, i'd already make it up to 900Mhz. However, now i'm using a power-meter to ...
0
votes
0answers
38 views

Flooding another device with hping3 from RPi

My purpose with flooding another device is to see the maximum traffic that the sender can generate with the hping3: sudo hping3 --flood -d 65495 192.168.0.3 I tested it with gigabit Ethernet adaptor ...
1
vote
1answer
300 views

Saving measured data to text file

Im using an ADC to measuring values and send them over a socket via the RP, yet I also want to save the values to my RP as I'm reading them. For some reason when I open the text file it only has the ...
-1
votes
2answers
233 views

Count time between two pulses in nano seconds

How can i count time between two pulses in nano seconds by using raspberry pi?
-2
votes
1answer
187 views

Energy consumption measurement using ACS current sensor [closed]

I want to build an energy consumption meter using my Raspberry Pi. I have done some research, and determined that the ACS712 current sensor could be interfaced with my RPi for this purpose. I do not ...
1
vote
0answers
1k views

Is there a way to check out the GPU usage (how busy it is) on a RPi3? [duplicate]

I have a Raspberry Pi 3 Model B and would like to know how busy the GPU gets when I run certain tests to determine whether it would be possible for me to do certain things. I see that the GPU is a bit ...
1
vote
2answers
353 views

How do I connect an S beam load cell to a raspberry pi 3 and then to my Laptop?

I am a university masters student who is currently working with a group of mechanical engineers to built a tabletop tensile and fatigue testing machine. To measure the forces being applied to a sample ...
0
votes
0answers
56 views

graph time vs frequency

I am in search of a code which can display the real time graph. I am going to display the microphone input signal in frequency vs time domain. The function that I am expecting is same as the vocal ...
0
votes
1answer
1k views

code to read live mic input audio frequency

My project is to create a kit to play recorded (music chords) audio file automatically changed with respect to frequency of live microphone input with a certain period.This will help the solo singers ...
1
vote
1answer
575 views

Why is my zero SPI clock frequency different than requested?

Using the SPIdev, I have setup the SPI clock frequency, but measuring the real signal frequency using oscilloscope shows, it differs extremely to the expectations. How is this possible? spi_fd = open(...
3
votes
1answer
4k views

Does Raspberry Pi 3.0 support HDMI 2.0 standard?

I am not able to see specific protocol version of HDMI (1.4 or 2.0) supported by RPI 3.0. Basically I want to take HDMI 2.0 output from RPI and provide it to my device. Also can we measure the rate ...
0
votes
0answers
593 views

Incremental Encoder / Frequency

Can anyone help. I have a raspberrypi3 with a photoelectric sensor and a 600ppr encoder hooked up. Everything is up and running, im using pigpio to capture my pulses from the encoder and using the ...
0
votes
2answers
239 views

Pigpio belt speed encoder

I'm trying to read pulses from an encoder to measure belt speed. My encoder is 500 ppr. I have approx 2400 pulses per meter and I need to measure speeds upto 450 meters per minute. Can anyone help ...
1
vote
0answers
67 views

Detect voltage using Raspberry Pi [duplicate]

Background My cottage has a cellar which is relatively humid, so I purchased a system that keeps the humidity at reasonable levels using a set of fans and a dehumidifier. The system runs two ...
1
vote
1answer
487 views

What sensors do i need to use to measure density? [closed]

I want to measure the density of object and I need to get the volume and weight of the object. What sensors do I use to measure density?
0
votes
2answers
2k views

Vehicle 12v detection or measurement

I have an idea that involves detecting and possibly measuring a 12v feed from a car but my electrics skills are a little limited and I'm using this idea to learn. My understanding is that the 12v feed ...
0
votes
2answers
605 views

How can I measure current with RPi at high voltage/high current (100-120V / 0-30A)

How could I measure current with a raspberry pi at voltages and currents that can be found inside a typical home's power outlets? The goal is to create a device that monitors how much energy is being ...
16
votes
2answers
3k views

Measure RPi3 power consumption without external hardware

I power my RPi3 using a power bank for smartphones, and I'd like to check how much power the Pi draws from it while my project is running. I don't have any special equipment for power measurement. Is ...
-1
votes
1answer
747 views

how to measure length [closed]

I want to measure the number of meters of running cloth off of a fabric roll. So that when I press a button a motor spins a roll of cloth and the fabric is rolled onto a separate roll. I want to be ...
4
votes
5answers
3k views

How to read values from an clamp-on ammeter with an raspberry pi?

I want to use a clamp-on ammeter (like this one) to detect whether a table saw (230V) is switched on or not. The clamp-on ammeter is meant to be used with a volt meter and has an 1 mVAC / A output ...
1
vote
0answers
364 views

Measure input voltage of Raspberry Pi B+ running Ubuntu

I just learned that a red flashing LED indicates voltage below 4.63V on a Raspberry Pi Model B+. Thus, the Pi seems to "know" about it's input voltage. So my question is: Is there a command to ...
0
votes
1answer
303 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 ...
7
votes
2answers
22k views

Count RPM/Frequency/Pulses on GPIO ports (Maximum?)

I'm planning to count the RPM of a RC Car which is controlled with a PI B+. But while planning the question occurs, how to count the RPM. My Idea is via a Sensor, which gives a Pulse every Round, and ...
2
votes
1answer
9k views

Measuring frequency via GPIO

I'm trying to input the frequency of a 3.3V square wave on a GPIO pin as a program feedback parameter. The input frequency range would be 1000 to 100,000 Hz and data polling would happen at 30 Hz. ...
2
votes
2answers
6k views

How to measure DC current RPi?

I have recently bought a Raspberry Pi, and I would like to be able to measure the current flowing through the circuit in our Greenpower electric racing car. It would also be useful to record this for ...
2
votes
1answer
190 views

Can GPIO measure 3-10ms input spike?

I want to measure speed with one infra gate. The width of the bypassing object is known therefore I could calculate the speed. However the infrared gate would be interrupted only for 3-10ms. I ...
0
votes
1answer
471 views

How to measure mains frequency safely via GPIO

I would like to measure the mains power (120vac/60hz) to know precisely when the voltage drops to 0, but in a safe manner for the pi - one solution would be to use a high-value resistor bridge that ...
1
vote
1answer
130 views

Mesure weight using force [closed]

Is it possible to use this force-sensitive resistor to measure weight between 10g-5kg(0,4oz-176oz)?
1
vote
1answer
8k views

Are my GPIO ports not working?

On my Raspberry Pi, I tried to do some experiments with GPIO, without success. Measuring the voltage between GND and GPIO11, for example, always helds a result of 0. I am using /sys/class/gpio ...
24
votes
5answers
39k views

How do I measure the current power consumption?

Is it possible to measure (with software, like PowerTOP) the Pi's current power consumption, on my Raspberry Pi?
8
votes
3answers
7k views

How to detect whether there is voltage between two points via GPIO?

I'd like to detect whether an external device is switched on or off. I found two pins where there should be 5V between in the first case, but the voltage may vary a bit and I don't wont to break the ...