Questions tagged [wiringpi]

WiringPi is a C language library for accessing GPIO pins.

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How to use 4 CS for SPI in C++

I'm currently trying to implement 4 CS in RaspPi. I'm still a newby in this field and used the library wiringPi. For CS0 and CS1 this works totally fine. However now I have 2 more CS on the GPIO Pin ...
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77 views

Raspberry Pi Software Driven servo control with PWM using C and Wiring Pi LIbrary

I'm trying to get my raspi zero to move an SG90 PWM driven servo. I have achieved this with python already using the gpiozero library, so I know my hardware works but I am trying to do it with C using ...
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4answers
2k views

GPIO pins not changing state

I have Raspberry pi 4B, and I want to interact with the GPIO pins. I connected simple LED wiring to physical pin's 37(GPIO25) and 39(GND). After exported pin, and set up mode to "out", I ...
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2answers
209 views

GPIO not working on Raspberry PI 4 4GB

I have a RPi 4 running Raspbian with the Ubuntu Mate desktop environment, whenever I try to use the Wiring Pi library through a C script, to doesn't work at all. On using the gpio readall command I ...
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Rotary encoder working on Pi 3 but not on Pi 4

I'm trying to read an encoder switch using wiringPi (latest, 2.52). Whenever there is an edge on either of the encoding pins a or b, I store a snapshot of the state of both pins on two bits: int val = ...
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2answers
301 views

wiringPi.h not found by gcc. Works in Raspian, not Ubuntu Mate

This is my first time posting on stack exchange so I apologize if this is too much or not enough info on the problem. A few months ago I installed Ubuntu Mate 18.04 on a Raspberry Pi 3B+ and tried to ...
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1answer
163 views

how to use MCP23S17 pin expander via SPI

I'm working on a custom sensor that is wired to a couple of MCP23S17 gpio expanders, which are in term connected to a Raspberry Pi 4 via the SPI pins i.e. SPI_MOSI, SPI_MISO, SPI_SCLK and CE0 pin. I'm ...
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49 views

How to wire an electromagnetic lock to my raspberry pi

I am trying to build an RFID controlled electronic lock using my raspberry pi 4. I am still brand new to robotics and so far have only been able to turn a LED on and off. I bought the following ...
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1answer
791 views

Enabling of I2C-0 via “dtparam=i2c_vc=on” on Pi 3B+ causes “I2C-10” & “I2C-11” to appear and disables GPIO 10 GPIO 11

For reference: I am using the latest release Pi OS Lite, Aug 2020 version. I am developing an application using Pi4J. I am referring to pins via this Pinout: https://pi4j.com/1.2/pins/model-3b-plus-...
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says i don't have wiringpi module when runing code at startup

I have a code set up to run at boot, and it works fine when I start it via terminal, but it doesn't run at boot. I opened the terminal, and this is what I saw: Running at boot Traceback (most recent ...
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I2C, SPI and Python Libraries with Raspberry Pi 4b

I've been working with RPi.GPIO so far but I have had issues with PWM and edge detection, which are well known issues with RPi.GPIO, anyway, after some research I'm considering using a different ...
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Can't get to toggle leds with WiringPi library in C

So I got my python code to run that basically just toggles the LED, but now I tried enabling the GPIO via WiringPi library in C but it doesn't work. Considering python code runs, there isn't really ...
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99 views

libpgiod vs wiringPI code/configuration

I have an RPI, setup with wiringPi and some code I wrote to read a quadrature encoder. It works just fine, I can read the pins, using a wiringPiISR mechanism (the ISRs get executed on the rising as ...
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2answers
87 views

Output resistors and GPIO

I am planning to control a IC (CD74HCT299E). I have currently GPIO-pins directly hooked up to the IC. My Question is, does the Raspberry pi have resistors before the GPIO-pin, or do I have to or ...
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1answer
125 views

Running pump & servo - Relay needed?

simulate this circuit – Schematic created using CircuitLab So I am working on a project that will require both a servo motor plus a small water pump. Both run on 3.7 -6v and I am going to use ...
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1answer
266 views

How to write 16 bit data to device address using the i2c wiringpi lib

I am trying to write 16 bit data to i2c device . As there are no registers specified to write to the slave device, I am not able to use the built-in wiringPiI2CWriteReg16 Api. Can some one guide me ...
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gcc and g++ compilers don't find wiringPiSetup() and wiringPiI2CSetup() functions

Update/solution: The sample program(s) Gordon refers to are at github/wiringPi - specifically for me lcd-adafruit.c. On my Rpi, the correct libraries are in /usr/lib and are libwiringPi.so and ...
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How do I hold SPI high value?

I'm using wiringPi spi library to communicate two raspberries. As the spi clks aren't synchronised, I don't read the high values, since they are only a pulse. Is there a way to hold the high value ...
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Controlling PWM by wiringpi through python programming [closed]

Can anyone give me the program for controlling PWM by wiringpi through python programming? I have already searched on the net but could only find program through C programming.
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99 views

Initializer element is not constant serialOpen WiringPi

I'm getting an error when trying to run some code on my raspberry pi. Here is the source code: /* SimpleReceive This sketch displays text strings received using VirtualWire Connect the Receiver data ...
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107 views

Can't read data from PN532 NFC reader over SPI

I'm using Pi4J library to read data from a NFC reader based on PN532, connected to my Pi via SPI. However, I don't seem to receive any data from if when I put a NFC card to my reader. I'm using SPI0 ...
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1answer
98 views

Crontab with WiringPi

I want to change pin state at certain time with Crontab. I tried to use this command: 7 0 * * * /usr/bin/gpio -g write 0 0 but it returns me this error: bash: 7: command not found I also tried: 7 0 * ...
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Changing speed of a stepper motor break the rotation smoothness?

I'm using node-stepper-wiringpi with the L298N driver (12V) to control a stepper motor. If i put a speed of 30 the rotation is smooth but if i put more than 30 the stepper struggle to make the ...
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2answers
708 views

GPIO pullups not working?

Sorry for the very basic question. I am trying to set a built-in pullup on GPIO pins and it doesn't seem to be working. Hardware is Pi 3B and 4B (I tried on both), OS is Raspbian 10 (buster). The ...
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1answer
2k views

WiringPi and ADS1115 C/C++ sample programs

I am trying to create c++/c program to AnalogRead using and ADS1115. I have seen that wiringPi has support for ADS1115 but i could not find any sample program to start with. Can anybody link guide me ...
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4answers
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Setting Pull Up/Pull Down mode doesn't work (mostly)

I can't seem to set the pull-up resistor mode on the PI4 with most methods I try. I have tried: C# (the new System.Device.Gpio interface), WiringPi (using a C# abstraction), and wiringPi command line ...
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123 views

using Pi Zero W GPIO relay control

I am trying to control my relay with Raspberry GPIO. Using the terminal to write to gpio5 (Physical 18, BCM 24) works: gpio mode 5 out gpio write 5 1 Trying to do the same in my c++ code doesn't ...
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2answers
457 views

Wiring Pi Issue - #!/bin/bash vs #!/bin/sh

I am working on a project and have an application shell script. For function part, I need the GPIO access, and for that, I am using the standard wiringpi package. The issue I am getting is with the #...
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1answer
237 views

How rpi3 as slave use i2c with wiringPi

I tried to let my rpi3 with wiringPi as slave to receive data from master and data +1 send to master . mater send 1 to slave (rpi3) My rpi3 SDA is GPIO 18 ,SLC is GPIO 19 the code on my rpi3 : #...
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1answer
122 views

How to use at the same time 2 hardware pwm in wiringpi

I need help to configure 2 hardware PWM channels. I am developing device, and sometimes I will need active 2 PWM channels with different frequencies (frequencies is low: 410 and 580 Hz).I'm writing ...
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1answer
181 views

How can I require root privileges for invoking 'gpio' from WiringPi?

I removed my user from the gpio group, logged out and back in. I can still run e.g. gpio write 25 1. I see from this answer how the memory mapping and permissions changed between Jessie and Stretch, ...
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181 views

Interrupt issue - Wiringpi and pigpio show different values for pin

I am having an issue with raspberryio/wiringpi interrupts. A lot of extra interrupts are generated. My configuration is as follows: Physical pin 16: Set as input Pulldown resistor Interrupt ...
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2answers
1k views

What is the correct way to use /dev/gpiomem with mmap to get access to Raspberry PI3 peripherals

I'm implementing a pascal library to deal with RPI3 peripherals. My goal is to control GPIO pins' functions, pins' logical levels, pins' pull resistors, I2C and PWM, at least. To achieve this I'm ...
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3answers
2k views

Input on GPIO at very Fast Speed

I am getting a signal at 1 GPIO which i need to read at an interval of exactly 10^ (-6) seconds. I am using wiringpi.h in C and the issue is that digitalRead() also takes some time thus i am not able ...
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1answer
387 views

pwmWrite() does not change dutycycle immediately

I'm using wiringPi for PWM on BCM18. I tried to use this to generate a STROBE-equivalent signal to turn ON the LED for the Camera Capture. My intention is to synchronize the LED-ON to shutter opening (...
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1answer
1k views

Cross compiling for RPi - error while loading shared libraries

I'm trying to compile a simple program on my Ubuntu using the ARM cross compile toolchain (arm-linux-gnueabihf-gcc) and run it on my Raspberry Pi. The program is using the wiringPi shared library (...
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2answers
257 views

Connecting multiple DHT11 sensors using WiringPi and C

For my internship I need to get measurements of multiple dht11 sensors and send them to a database using a REST API. I decided to go with WiringPi and C. I followed this tutorial: http://www....
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1answer
118 views

GPIO not fast enough for RF transmitter?

I'm trying to control a 315MHz RF socket using the RCSwitch library. I tested with an Arduino and it worked 100% of the time but when porting over to a pi zero I can only get it to correctly turn on / ...
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1answer
419 views

Python RPIO.ChangeDutyCycle() Equivalent in WiringPi (C)

I'm currently developing an application with the WiringPi library. I have implemented a prototype in Python, and I'm currently trying to reproduce the same behaviour in C++. However, I ran into some ...
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0answers
1k views

Access Timer Interrupts in Raspian

I want to write a C program that runs some code at a fixed interval (somewhere between 200us and 1ms, TBD). Is it possible to use the hardware timer interrupts to execute code without resorting to ...
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2answers
634 views

Why is WiringiPi unable to find hardware revision?

I installed Ubuntu 18.04 on a Raspberry Pi 3 B+ and WiringPi following the instructions presented here. The problem is that when calling the GPIO utility, I get the following error: It seems that the ...
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0answers
85 views

Adafruit Ultimate GPS with Rpi 3 “Permission Denied”

I am trying to connect an Adafruit Ultimate GPS to my Raspberry Pi 3 and read data from it using the WiringPi Serial library. I have set the serial connection up and removed the serial console through ...
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1answer
3k views

Serial Port & C Code

I have a sensor connected to an ODROID UART (Basically an RPi just a different name for the UART port) and using the WiringPi Serial library. I am able to echo/cat to the sensor via two terminal ...
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334 views

GCC and makefile on Raspberry Pi running NOOBS deletes my c file

I am having an issue with my pi where I run gcc or make from the terminal and my main c file included in the compilation is deleted. I am using the wiringPi library to communicate with some sensors ...
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1answer
128 views

Can't trigger GPIO control via executable run through php's exec function

/var/www/html/index.php <?php exec("./on"); shell_exec("/var/www/html/on"); on.cpp #include <string> #include <getopt.h> #include <cstdlib> #include <sstream> #include &...
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1answer
565 views

How to access to I2C software with wiringpi library-

I want to use I2C software instead hardware I2C. Because a buggy parto of the I2C related with clock stretching. I can enable in boot.txt adding this: dtoverlay=i2c-gpio,bus=3 It would create a /...
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1answer
107 views

Wiring Pi - BCM 20 works with a button, but not BCM 21 :-(

I have two switches (buttons). Red is connected to physical pin 38 (BCM 20) and green to physical pin 40 (BCM 21). I call wiringPiSetupGPIO() it returns 0. When I use pullUpDnControl(redSwitch, ...
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263 views

WiringPi install using npm fails

I'm having a hard time installing the wiring-pi node package. It fails on the step "Making wiring-pi ...", spaming the terminal with build errors. If I clone and install wiring-pi manually as ...
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0answers
47 views

Raspberry-pi read data from thermometr

I am newbie at raspberry. I have raspberry Raspberry Pi Details: Type: Pi 3, Revision: 02, Memory: 1024MB, Maker: Sony * Device tree is enabled. *--> Raspberry Pi 3 Model B Rev 1.2 ...
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1answer
83 views

RaspberryPi getting error after reading some serial Input, using rs232 and C Language

my raspberry keep getting error after reading some serial input, like this: i'm using Library wiringPi with this sample code: #include <stdio.h> #include <string.h> #include <errno.h&...