Questions tagged [signal]

Use this tag for any question involving types of communications . Generally at the hardware level such as electric voltage levels or light colors. Modulation is a key component of data signaling, but the mere presence of a voltage can signal availability of a device.

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Connecting 12V doorbell signal to GPIO input

I'm trying to connect the signal from a doorbell to a Raspberry Pi Zero 2W to modernize the existing system with IoT capabilities. I did some measurements and I found that the terminal that powers the ...
SierraJuliettMike's user avatar
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39 views

Control Signal Raspbery Pi

I have a project to generate DCC signal so it needs to be used bts7960 to control the signal and connected to Raspberry Pi 3B. But, unfortunately the signal wave is not like digital signal perfectly. ...
Naufal Yanu Kusdianto's user avatar
1 vote
0 answers
50 views

Transmit data from LoRa connected to Raspberry Pi

I am working on a project related to data transmission between nodes and a gateway. Currently, I am using 2 ESP32s and 1 Raspberry Pi 3B+ as nodes, and another Raspberry Pi 3B+ as the gateway. The ...
Hien_lee's user avatar
1 vote
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34 views

When I put a bit in GPSET to 1, what is the actual mechanism that "reads" this register and put the electric line to HIGH Voltage? Who does this? How?

I don't know what is the actual mechanism. When the CPU sets that register(GPSET)'s bit to 1, what entity/element reads that and is responsible to activate the electric line to HIGH? How is this done?
Allexj's user avatar
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Reading Durations of signal train

I am receiving a signal train of alternate high low pulses and trying to read it on Raspberry Pi Zero W. I have enabled the one wire pin(GPIO-4) and used that pin to read the pulses. I am reading the ...
John Mist's user avatar
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0 answers
29 views

Can raspberry Pi support TWI communication?

I have an image sensor MT9V034-D, which is manufactured by onsemi. It is supposed to be controlled by TWI with a SCLK and SDA input, I want to use Raspberry Pi to control it. I know that Raspberry Pi ...
Jingxuan Cai's user avatar
2 votes
2 answers
429 views

Rasberry Pi signal repeater/extender

I'm trying to extend the range of a robot that uses UHF or Wi-Fi signal to communicate with its controller with a range of 100 meters. Is it possible to implement RPi 4 to serve as a signal booster/...
Sal7740's user avatar
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1 answer
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Spi wrong voltage

Obviously, my spi is not happy. MISO and MOSI were idling around 1.5v instead of 3.3 so I added a 10k pull up, and that helped a bit, but as you can see, it's still not good. It idles around 2.8v ...
bob mcgrath's user avatar
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1 answer
189 views

gpiozero and signal

My python script waits for motion (with gpiozero MotionSensor wait_for_motion()) most of the time. But it also needs to react to SIGUSR1. The problem is: when SIGUSR1 is received wait_for_motion() is ...
Antonio Garcia's user avatar
1 vote
0 answers
88 views

Problem with reading GPIO input value - photoeletric sensor

Good night! I've got some problems with GPIO input values in my code (Python). I'm using a Raspberry Pi model 3, and RPi.GPIO as GPIO module. I'm tring to get the signal values of a photoeletric ...
Eduardo Carlos's user avatar
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How I can transmit data from soil moisture sensors 10m away to raspberry pi?

I found this interesting project: https://hydrosysblog.wordpress.com/hardware/ And I want to apply a soil moisture sensor. But the sensor may be 10m or more (but less than 20m) away from the raspberry ...
Dimitrios Desyllas's user avatar
1 vote
0 answers
496 views

Monitor I am using is keep showing input signal out of range. (Raspberry-pi4) How can I fix it?

I am currently connecting my raspberry-pi4 to Hanns.G monitor. The monitor's display looks fine just except the message about INPUT SIGNAL OUT OF RANGE. This message is located at the center of my ...
임성래's user avatar
1 vote
0 answers
369 views

Trying to plot the ADC values from the PICO similar to what an oscilloscope displays. Just scrolls to the left right now. Total Python newbie

#!/usr/bin/python #Python 3.7.3 # Attempting to plot the ADC values coming from the PICO # Program contains only necessary lines of code for testing plot routine # The Raspberry PI Pico is connected ...
R Bowles's user avatar
1 vote
0 answers
182 views

I would like to control my Traxxas Stampede with a raspbery pi

So i want to make basically a glove where when i tilt my hand it will turn the car. (I'm going to just have simple buttons for forward and back so I only need to focus on one tilt plane) I plan on ...
lucifer's user avatar
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2 answers
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What is the maximum baud rate achieved in raspberry pi 4b

What is the maximum baud rate achieved in raspberry pi 4b for serial communication? I want to use RPI for communicating with PC(win, linux),Want to acheive maximum speed through USB communication. I ...
user138911's user avatar
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1 answer
394 views

Receiving noise signal on input pin after connecting jumper wire to GPIO pin Raspberry pi 4

I am trying to use GPIO pin to get input from the sensonr, after connecting the sensor I noticed I have a lot of noise ( fluctuating signals between 0 and one). After further troubleshooting I noticed ...
Shahin Shirazi's user avatar
1 vote
2 answers
479 views

GPIO configured as interrupts detects noise of the engine even if isolated

Did anyone work with a Raspberry Pi in a an automotive project ? I am working on creating a dashboard for a motorcycle and it is making me crazy! when configuring a GPIO pin as an interrupt it ...
mina's user avatar
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1 answer
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Transmitting a signal without an external transmitter [closed]

I found a repository called rpitx which can be used to transmit a signal (e.g. the signal of the keyfob of my gate). I'm wondering how this is possible without an external transmitter connected to the ...
Gennaro Arguzzi's user avatar
1 vote
2 answers
527 views

How to use 2 GPIO pins for 3 buttons

I am using almost all the GPIO pins on a project so I had to be resourceful when adressing the pins for the buttons. But I just can’t get it to work. I don't know if something is wrong with the code ...
Mysterious Challenger's user avatar
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0 answers
175 views

What is going on with the Raspberry PI SPI? Weird jitter in signal

I'm using python and spidev to do spi transactions over the Raspberry Pi's spi channel. I'm having a couple of different things happen that are not what I am expecting. This is a capture of a spi ...
Hal Owens's user avatar
1 vote
1 answer
855 views

Raspberry pi4 + ADC

I have been working with Raspberry pi 4 to acquire analog signals. I get AD/DA High Precision Board by Waveshare (ADS1256 A/D) to convert analog input and I downloaded python source code from ...
Tagalog's user avatar
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3 votes
1 answer
3k views

Real time + High frequency ADC data reading with Raspberry Pi 4

I need to acquire a signal at a minimum sample rate of 10 kHz and processing it real-time using a Python code. Since Raspberry Pi only reads digital signals I get an ADC (High Precision AD/DA Board ...
Tagalog's user avatar
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0 votes
1 answer
378 views

Sending a NEC like signal via a GPIO

I'm trying to control an existing LED strip controller with a Raspberry Pi. The controller has an IR receiver to receive commands. I removed the IR receiver of the controller and added a connection to ...
stg93's user avatar
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1 vote
1 answer
345 views

Waveshare AD/DA espansione board setting sampling frequency

In order to acquire 3 analog signals with Raspberry pi 4 I want to use ADS1256 Waveshare's AD expansion board ( 8 channels single-ended, 24 bit). I was wandering if there's a way to set a different ...
Tagalog's user avatar
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-1 votes
2 answers
171 views

GPIO 3.3 V signal still readable after inputting high resistance values

I recently obtained a raspberry pi 4 (8GB) and I am trying to understand the GPIO behavior and ran into an event that I don't understand. I have set-up a simple script that allows pin 36 (GPIO 16) to ...
Maxime's user avatar
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1 vote
2 answers
4k views

Monitor only recognises the signal when started first

My monitor, an old Toshiba 47wlg66, will display what my boards output (whether it's my old Raspberry Pi 1 A or new Raspberry Pi 4 B) only if it was powered first. Otherwise it will remain black.. It ...
Shautieh's user avatar
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-1 votes
2 answers
2k views

Connecting Raspberry Pi 4 to old VGA monitor

I'm trying to set up an old monitor to use with my Raspberry Pi with Ubuntu 20.04, but whatever options I try, my monitor doesn't detect any signal coming from raspberry. I have original HDMI cable ...
Marcin Nowowiejski's user avatar
1 vote
0 answers
267 views

High-precision time-varying PWM outputs on R Pi

I'e seen a lot of examples of simple PWM on the Pi where relatively high-precision PWM signals at a fixed duty cycle can be generated using WiringPi or pigpio in hardware PWM mode. I have tried ...
a ortiz's user avatar
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1 vote
0 answers
52 views

Monitor not recognized by other devices after having connected my raspberry pi 4

I have a weird problem and I simply can't find any solution to it: I use a Fujitsu Siemens monitor with a dvi to hdmi cable which works just fine with all my devices. However, after I connected my ...
Matthias's user avatar
1 vote
1 answer
125 views

PedalPi, lag when piping in data

I am modifying a pedal pi (link here). I split the input program from the output program. For simplicity right now, that all it does. The standard out from my input program is being fed to the ...
Aubrey Champagne's user avatar
2 votes
0 answers
1k views

Interpreting voltage output on ADC with rated AC current sensor

I know I have asked similar questions before, but I have switched sensors and encountered interesting results that I do not understand. Purpose: I intend to use an AC current sensor to measure ...
Tuomas Talvitie's user avatar
2 votes
0 answers
48 views

HDMI No signal on one tv but signal fine on another

I am using a pi zero w. I have used it on two TV's to date. It's been a month or so since I last used it and now it works on only one of the TV's. This wouldn't be a problem but I am giving this to ...
Dan's user avatar
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1 vote
1 answer
458 views

Interpreting 10-bit ADC output

I am having difficulty understanding the output from my ADC. I am using a 10-bit MCP3008 with a photoresistor and CT current sensor connected into the analog inputs. I am reading the signals with this ...
Tuomas Talvitie's user avatar
1 vote
1 answer
329 views

How to enable sending keyboard signals while in SSH?

When I use a keyboard plugged into the pi directly, I can send signals using ctrl+T / ^T to get messages from ongoing commands in terminal. When I'm logged in via SSH on my mac, I seem to lose this ...
grad student's user avatar
1 vote
2 answers
3k views

Broadcast VHF or UHF to CRT TV

I picked up this TV and thought it may be fun to use it with a Raspberry Pi. https://www.cnet.com/products/spectra-52-bw-5-crt-tv/ However, I soon realized the only way to get a video signal to the ...
Justin's user avatar
  • 89
2 votes
2 answers
1k views

How can Rpi read ADS1256's negative values?

I'm using this Raspberry Pi High-Precision AD/DA Expansion Board from waveshare. I have some questions regarding its ADC (model name: ADS1256) unable to give out negative value. Specifically, only ...
Jihun Kim's user avatar
1 vote
2 answers
650 views

Raspbian Stretch lite doesnt send HDMI signal on second boot

I have installed the most recent Raspbian Stretch lite (release: 2018-11-13) to a SanDisk ultra A1 micro SD card to use it for my Raspberry Pi model 3B. I connected a HDMI monitor and a USB keyboard ...
J.Doe's user avatar
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0 votes
1 answer
144 views

Generating signals with Pi

I have a vector of 500 numbers and would like to output these at a sample rate of 1kHz, thus a signal time of 0.5seconds. Is there any way to do this using a Pi? Do the GPIO pins only allow for an On/...
bob776's user avatar
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0 votes
0 answers
2k views

Python script wait for button press before starting/stopping a separate python script

I've written a python script (shown below) which starts and stops another separate python script (datalogger) once a button is pressed. The datalogger script records logic levels (0 or 1) and stores ...
user avatar
2 votes
1 answer
9k views

How to start and stop python script using button

I've written some python code that should start and stop another python script (Datalogger) when a button is pressed. So when the Pi is booted up I'm wanting the button script to run and then once I ...
user avatar
1 vote
0 answers
146 views

Data acquisition using DSO 2150 (Hantek, Virtins, etc.) in Raspberry Pi

I have Virtins 2815H which is a DSO based on DSO 2150, I would like to real time record a signal around 1 MHz using it and process it in Raspberry Pi. I have searched a lot about the data comm from ...
Zahi Azmi's user avatar
2 votes
3 answers
1k views

GPIO relay signal cross turns to all relays staying on after Darlington added

I have 4 Sunfounder 2 channel relays 7 of which that I'm using to control some things on my aquarium. I suspect that I may have wired them up wrong somehow though. The behavior I'm seeing is as ...
Brad W's user avatar
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0 votes
2 answers
3k views

GPIO.wait_for_edge and signal.signal()

I have the below sample code that is trying to implement a safe shutdown mechanism ( yet to fully implement) For some reason, I am not able to catch any signals using the registered signal handlers. ...
Pradeep Prakash's user avatar
1 vote
0 answers
28 views

Changing RPi version may lead to binary corruption?

Apologizes for the object, but I cannot easily summarize the scenario. I created an sd-card based upon Raspbian Stretch Lite, with some customization. Then I cross-compiled Qt5.9 and copied the ...
Mark's user avatar
  • 513
1 vote
1 answer
911 views

SignalR on Mono Raspbian

Had tried to launch SignalR client (.NET Framework 4.5 target) on my Pi 3 with Mono on Raspbian. But it's not working because SignalR's throws a System.InvalidProgramException - something wrong with ...
MihailPw's user avatar
  • 153
0 votes
1 answer
1k views

Send and receive 868Mhz signals with my Pi

My home lighting is achieved using wireless Delta Dore switches working in 868 Mhz. Here are my switches reference : https://www.deltadore.fr/data/product_files/6351091/documents/notices/Util/fr/...
Rémy's user avatar
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2 votes
0 answers
258 views

Raspberry Pi + Windows 10 IoT Core + RS485

Has somebody ever worked with windows 10 IoT Core and used RS485? I would like to receive some signals from the RS485 device. I would like to do this with Windows universal app.
ARichter's user avatar
0 votes
2 answers
12k views

Raspberry Pi no signal to hdmi

This is the first time I've tried to use a raspberry pi, I bought a CannaKit that came preloaded with NOOBS. When I attempt to boot with the HDMI my screen says no signal, the HDMI output is correct, ...
user5574068's user avatar
5 votes
1 answer
10k views

Control signal strength of Raspberry Pi 3 WiFi signal down to minimum

With the Raspberry Pi (latest Raspbian OS) configured as a WiFi Access Point that gives internet access through ethernet interface, I'm doing some WiFi Signal Strength testing. In reduced space to ...
jon's user avatar
  • 53
1 vote
1 answer
2k views

Square wave generator using RPi 2

I am completely new to this and I am not into programming. My requirement is to generate a 965Hz precise square wave. This frequency may need fine tweeking from 955Hz to 975Hz depending on other ...
Umesh R's user avatar
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