Raspberry Pi Stack Exchange
Raspberry Pi Stack Exchange

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.

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.

62 questions
21
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4 answers

How can I generate frequency / pulse signals?

I am looking at ways to use the Raspberry Pi as a signal generator. Currently I am working on hooking up an inexpensive AD9850 module from ebay. This will generate fairly accurate frequencies up to 40MHz (70MHz with the AD9851). I guess the audio…
John La Rooy
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votes
2 answers

What is a accurate way to generate and decode IR signals?

I want to receive and generate IR signals with my PI. What is the best way to reliably do this? Would it be with something like this?
PersonOfInterest
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5
votes
1 answer

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 work, I need to test quality of network with a…
jon
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5
votes
2 answers

How to find distance and direction of IR signal?

I am wondering where I should start in trying to get my Raspberry Pi to detect the distance of an IR signal and the direction of it. Has someone already done something similar? The end goal is to get a RPi robot to follow the signal; move towards it…
M2com
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3
votes
1 answer

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 from Waveshare, with ADS1256 8 CHANNELS 24 BITS,…
Tagalog
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2
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2 answers

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 giving out negative values around -0.1V. Here are…
Jihun Kim
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2
votes
1 answer

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 press the button it will start another python…
user93154
2
votes
3 answers

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 follows; if I open either Drain Pump/Fill Pump…
Brad W
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2
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0 answers

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
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2
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1 answer

Import composite/ntsc-signal

I already googled a lot and mostly read that importing composite Signal to the Raspberry is almost impossible. I would just take a webcam and proceed since it seems to be a lot easier. The problem is, I already have this camera and just wanted to…
ibanes88
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2
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2 answers

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/extender to increase the range? Any thoughts I can…
Sal7740
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2
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0 answers

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 electrical current flow running through a simple table…
Tuomas Talvitie
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2
votes
0 answers

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 someone as a gift and I need to know it will work…
Dan
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1
vote
2 answers

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 to it. The first Time I boot up the Raspberry Pi,…
J.Doe
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1
vote
0 answers

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 it for data acquiring, but there is only written…
Zahi Azmi
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