Questions tagged [pigpio]

pigpio is a library for accessing GPIO pins as well as other functions including I2C. pigpio has a client-server architecture , which enables you to remotely control GPIO pins.

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221 views

Multiplexing to 1000 devices, Raspberry Pi and Python

All, I'm working to develop a piece of hardware that allows me to control 1000 outputs (servos) from a single output pin. I'm using pigpio on a Raspberry Pi B3 with python. I'm also using an array ...
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2answers
144 views

pigpio I2C reply value

I'm sending a command e.g. "wifion" with I2C arduino(master) to RPI(slave) That works perfect but I need to return a confirmation value. How can I send back/reply from the RPI to the Ardunio a value? ...
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1answer
67 views

PWM with pigpio does not trigger alert function regularly

I combine C examples of pigpio for gpioSetAlertFunc and gpioWaveTxSend working with the same pin. My PWM has several pulses, so I expect alert function to print out a message for me several times. ...
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1answer
83 views

Is there a GPIO current limit function available, and where is the documentation?

I have read that limits may be programmed for the output current of GPIO pins. However, after reading several online versions of Broadcom's data sheet for the SoC, I've found nothing to corroborate ...
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1answer
65 views

I2C slave on a RPi Model B with pigpio?

I want to use the I2C slave provided by pigpio with a Raspberry Model B. pigpio documentation says GPIO 18 and 19 are used for that. Unfortunately there is no GPIO 19 on an RPi1. Is it possible to ...
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15 views

How can I share a C++ class variable between a thread started with the pigpiod start_thread () method and the main thread?

I've got a C++ class containing some class variable like char some_class::current_command. One of the static methods of this class, say void Play () now calls the pigpiod start_thread () method to ...
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1answer
177 views

Pigpio Wiegand timeout

I have an RFID keypad linked to my Raspberry Pi. It sends out a Wiegand 26 signal when someone presses a key or presents a card/fob. The code is based on http://abyz.me.uk/rpi/pigpio/examples.html I ...
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1answer
126 views

enable software i2c on raspberry pi gpio

I am trying to interface more than one sensor with Raspberry Pi Zero W, which communicate using i2c interface. So far I am able to connect sensor to dedicated i2c and read the data. Want to know ...
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57 views

How to track steps of multiple stepper motors with different frequencies

I’m working on a small stepper motor driven vehicle powered by a Raspberry Pi 3B. For the motor control, I am using the hardPWM function of the pigpio library from Joan, which is working great. I can ...
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1answer
91 views

How can I use the RPI3 to generate a sawtooth with frequency around 20kHz?

I am trying to generate a sawtooth waveform from the GPIO, the frequency is high, 20 Khz. is pigpio library my best option?
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300 views

How to control the raspberry pi over internet using android app?

I had bought a Raspberry pi 3b+ recently to make many of the projects I had dreamed of. Most of these (or maybe all) involves controlling the GPIO pins over the internet using an app. One of the ...
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1answer
140 views

pigpiod pid listen on port 8888 [duplicate]

My nodejs app is using pigpio. It keeps getting error because port pigpiod is listen on port 8888 already. I can kill -9 the process but when I restart pi port 8888 is jammed up again. How do i solve ...
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1answer
189 views

nodejs app running pigpio - error Can't lock /var/run/pigpio.pid

I am trying to run my Nodejs app but keep getting error: initInitialise Cant lock /var/run/pigpio.pid. I tired remove the the file with rm /var/run/pigpio.pid but the error remains. I have read tons ...
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83 views

using I2C in threads

I have several devices on one I2C Bus and am wondering now what happens, if I have some threads using this one I2C Bus. Do I need to implement a scheduler or is the I2C Bus automatically blocked ...
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2answers
644 views

How to make a button toggle a led?

I have some code which turns an led on when I hold the button. But only when I am pressing it. Could somebody help me so when I press the button then the light stays on and if I press it again the led ...
2
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1answer
74 views

Two data parsing frames for SPI reads of MCP3008 ADC, any advantages or disadvantages of either one?

I am reading an MCP3008 ADC using pigpio, I've abstracted the script below. I have also found a slightly different construction or parsing of the three SPI command bytes and reconstruction of the ADC ...
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1answer
2k views

OSError: [Errno 121] Remote I/O error or pigpio.error: 'I2C read failed' on MPU6050

So I use MPU6050 to get acceleration from stepper motor linear rail movement(steper motor working in thread, I use pigpio for the motor) by make the MPU6050 can work on threading and it can show data ...
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1answer
589 views

Problem autostarting pigpiod

On my Pi3B+ I had pigpiod configured to run on boot and I can successfully run compiled c programs; specifically DHTXXD.c which contains:- /* DHTXXD.c 2016-02-16 Public Domain */ #include <stdio....
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2answers
570 views

AttributeError: 'NoneType' object has no attribute 'send' pigpiod

So I create an another program that can run stepper motor clockwise and counter clockwise with a ramp up and ramp down in there and adding limiter switch on GPIO 16 and 26 to stop the pi....
2
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1answer
166 views

Does pigpiod feature a verbose / debug mode?

As I'm currently trying to debug an issue with my SPI link, which is addressed through pigpio, I'd like to make pigpiod write warnings and debug messages (if such occur) to stderr.
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283 views

pigpio library serial_wave confusion

I am trying to use joan's pigpio for python to try to write a command from a rpi3 GPIO pin to a peripheral device. the peripheral device uses UART and when it receives a data packet it will then ...
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154 views

After switching from pigpio to pigpiod, how can SPI write operations display random bit errors?

I've already written and tested some code using pigpio to drive a Futaba GP9002A VFD. When using the pigpio lib directly, it worked almost absolutely fine, but after migrating to the pigpio daemon (...
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278 views

pigpio python serial wave output not correct

I am trying to use joan's pigpio to write a serial command on my Rpi 3 gpio 14(UART0TX).My goal is to write a command from the pi to another device. When i send the command i do not see the ...
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73 views

Trying to use pigpio wavechains to drive very specific acceleration and deceleration

I'm working on a kinetic sculpture that involves a large pendulum swinging perpetually left to right. I'm using a raspberry pi 3 B+ / arduino uno with a DM860AC to control a nema 34 stepper. I was ...
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140 views

Raspberry as I2C Slave, how to slow down transfer rate?

I have had minor success using the PIGPIO library and interfacing the Pi as an I2C Slave (Using GPIO Pins 18 and 19 as SDA and SCL) with a Campbell CR1000X Datalogger I am encountering a problem ...
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1answer
365 views

Problem counting pulses

I want to count pulses and find the frequency. Here is the picture of pulses from the oscilloscope: Obviously, frequency is around 1/2.3 ms = 420 Hz. First I tried this program: import RPi.GPIO as ...
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1answer
1k views

Pigpio setting mode to BCM or BOARD

Is there any option in pigpio library that sets pinout mode as BCM or BOARD ? I decided that in pigpio default is BCM but in RPi.GPIO there is an option to change that like GPIO.setmode(GPIO.BOARD) ...
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1answer
58 views

When switching to pigpiod, which replacement shall I use for gpioSetTimerFunc()?

When still using the pigpio API "directly", I made extensive use of the gpioSetTimerFunc function, just like this: gpioSetTimerFunc (4, 500, OnRDSDataTimerElapsed); After making pigpiod do all the ...
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1answer
543 views

Using hardware PWM and audio simultaneously

I am developing a project on a Raspberry Pi 3 B+. I am using the PWM0 channel to send a custom-made IR signal using PiGPIO waves. I gather it might then be possible to use PWM1 for mono audio; is that ...
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1answer
66 views

Strange signals on GPIO 14 & GPIO 4 when ribbon cable is attached to GPIO

I'm using RP3B. I'm using piscope, as I don't have an oscilloscope available. After I boot my RP3B with nothing attached to the GPIO port, if I start pigpiod and piscope, I see all my GPIO with a ...
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1answer
2k views

How to read motor RPM open collector tach output

I have this motor which has a tach output that I want to use to read motors RPM, EC centrifugal fan - RadiCal. On page 4 there is a shcematic diagram and it also says Tach output: open collector, 1 ...
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2answers
2k views

Python pigpio 'no permission to update GPIO'

I am trying to run the following code on my Raspberry: import pigpio import fileinput pi = pigpio.pi() ### Define constants pwm_range = 255 pwm_clock_div = 8 left_motor_dir_pin = 35 ...
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1answer
93 views

Raspberry PI GPIO Extender [closed]

I am trying to control 42 relays with a Raspberry Pi 3 B+. Due hardware limitations, there I cannot do that with the current amount of GPIO pins. I've found some GPIO Expansion Boards online, but I ...
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1answer
1k views

RpiZeroW - Can't find `pigpio` while running Python code

I have a python code, using gpiozero. When running this code on a RPI-ZEROW it fails, while running same code on RPI3 it succeeds. All installed pretty much the same ( shown checks below ), pigpio is ...
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0answers
105 views

pigpio monitor GPIO not detecting change correctly

I am having trouble detecting a level change on pin 16 (or any other pin). My script is as follows: import RPi.GPIO as GPIO from time import sleep GPIO.setmode(GPIO.BOARD) GPIO.setup(16, GPIO.IN, ...
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91 views

How to generate a hardware PWM wave for driving an LED through RPIO?

I've looked through the documentation of RPIO, and used GPIO18 to get my PWM up and running. This is my code: from RPIO import PWM servo = PWM.Servo() servo.set_servo(18, 4000) As explained in the ...
3
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1answer
82 views

pigpio pwm — gpio <pin_no> bad dutycycle (nnn)

I'm tinkering with the pigpio [C] PWM functions and get ``pio bad dutycycle (nnn)'' messages while cycling an LED with increasing/decreasing gpioPWM() values. As always, any help will be greatly ...
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2answers
588 views

How to read a specific register using spi_xfer from PIGPIO

I am building a single channel LoRa gateway using the RFM95W module. I am using this github repo; single_chan_pkt_fwd, as a guide. However I am not yet using a PCB, even though it is very difficult, ...
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1answer
356 views

Slow i2cdetect command response after running a program using the pigpio library

System: RPi # B OS: Ubuntu-16.04 Ma'te desktop environment Problem: i2cdetect -y 1 command response ultra-slow after running a program using the pigpio library in a program. ...
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1answer
364 views

pigpio spi : use an other GPIO for chip select

I'm using the Waveshare High-Precision AD/DA Board, and they not use the default chip select pin of RPi (GPIO# 7, 8) for SPI. Using the pigpio python library, I want to know how to change the chip ...
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2answers
90 views

Monitor data sent to shift register

I am trying to build a remote control for a jacuzzi using RPI. For that I have been analysing the data between the display and the main board. I found that the display holds 2 shift registers 74HC595 ...
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1answer
245 views

Speeding up updating of GPIO pins

I have a program where each step, two GPIO pins have their duty cycle updated (I'm using pigpio). I'm running the program for millions of steps (think 50 to 100 million) and running the PWM outputs ...
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1answer
348 views

Updated info/software/advice on using Raspberry Pi to control stepper motor drivers

It's been almost a year since the last posting in here covering this topic - are there any newer examples or libraries that you (Joan or anyone) know of that do the acceleration ramp, constant run-...
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1answer
846 views

How to get a power output from raspberry Pi 3 B+

I'm pretty new to these electronics so i'm trying to figure out if I could take a 5V power output from the Pi3 B+. I'm such a noob that I can't figure where the GND and a GPIO with a 5V could be?
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1answer
571 views

Fail to run Remote GPIO code from a PC using python3

I'm trying to run a remote GPIO code from a Linux machine to operate on RPI3. Code is running OK on another RPI3 to control each other, but when trying to do so from a PC, it fails. I followed the ...
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1answer
81 views

Stuck inside socket.io

With the following node server I drive the motor speeds with a slider on a web page using socket.io. I would like to stop the motors when the robot touches a wall: var express = require('express'); ...
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1answer
170 views

pigpio, update xfer.txBuf

Question refactored: Im currently struggling to understand how to update the transmit FIFO of the bsc_xfer. For reference: Slave side: int main(int argc, char** argv) { int GPIO = gpioInitialise();...
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1answer
1k views

PIGPIO wiring, basic i2c slave questions

I'm toying with pigpio and I can't find some informations: 1) I'm currently using a arduino uno to send bytes (as master) to a Rpi3 as slave, I currently use BCM2 as SDA (A4 on Uno) and BCM3 as SDL(...
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1answer
130 views

how to set RF frequency in PiGPIO?

I'm using the PiGPIO library to receive a waveform but I don't see a way to make sure the RF frequency is correctly set. I'm using the class rx() which is supposed to read a signal transmitted on 433 ...
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0answers
32 views

Attempting to read from GPIO23 but it only reads 0

I am trying to follow this guide on making an ir receiver/blaster. Currently I am trying to work on the receiver end of things but the pin reads 0 at the beginning instead of 1 like the guide says. ...