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.

2
votes
0answers
35 views

Waveform not cancelling out hardware PWM

I've run into problems using pigpio's wave generator in combination with hardware PWM. Currently I'm working on a motion control with acceleration/sustain/deceleration phases. The phases are saved ...
1
vote
1answer
44 views

Why is pigpio library not moving my servo when the same pin number works perfectly with RPi.GPIO?

I am working on a self driving rc car project and I need a servo to steer my car. As I was getting a bit jitter with RPi.GPIO I tried pigpio library. I am using a Raspbery Pi Model B. But it won't ...
1
vote
0answers
12 views

Writing to a sensor register using i2c bitbanging library not working - PiGPIO library on Raspberry Pi

I am trying to configure a sensor connected to Rpi over an i2c bus. I am using PiGPIO library with Python to do this. To configure the sensor, I need to write a certain value to some registers and ...
-1
votes
0answers
28 views

Raspberry Pi Zero simultaneous robot control

I'm making a robot project, where I have 4 servos (2 driving and 2 steering) and 2 separate brushless motors. My intention is to be able to drive and steer the robot, while the 2 BLDC are spinning at ...
1
vote
0answers
19 views

Cannot remotely connect to pigpiod

I have pigpiod installed on my system and enabled with systemctl enable pigpiod systemctl status pigpiod shows it is running, and I have programs which successfully access it on my Pi3B+ ● pigpiod....
2
votes
1answer
23 views

remote connection pigpio

Asking the other day this question I discovered a new fascinating world, the gpio zero library. My first code was this (an example to blink a led): from gpiozero import LED from time import sleep ...
2
votes
1answer
90 views

Any way to add more GPIOs to the AIY Voice Kit?

I'm working on a project using the google AIY Voice Kit V2 as a base. I'm planning on adding a keypad which requires 12 GPIOs. Does anyone know of a way to add more GPIOs to the Pi Zero W with AIY ...
1
vote
1answer
36 views

use GPIO and/or UART to slow initiate K-line (ISO9141-2) communication with Audi ECU

Related to this question I'm learning to use the Pi GPIO and Python serial to communicate through an IC (L9637D) to interrogate PIDs for alarms etc. I can't get past the slow initiation sequence! ...
1
vote
2answers
33 views

ESC Initialization using Pigpio

I have been tasked with a little RC demo at our trade counter, and I need to control a few servo's and a ESC to run a motor. I have been trying to fumble my way around to no real avail, I have used ...
1
vote
1answer
52 views

PC/Xbox Controller servo control

I am making a project where I want to use a PC/Xbox controller to control my servos with analog sticks. I've been following this tutorial and I've used the code down below to control my servo motor ...
1
vote
1answer
57 views

Pigpio not calling Callback for first rising or falling edge

I have some sample code (taken out of my larger program) that regularly (but not always) missing the first rising edge: #!/usr/bin/python import pigpio, time def callback(g, l, t): print("Callback ...
1
vote
1answer
26 views

RFID RC522 reader pigpio check error

I'm trying to connect Raspberry PI 3 B+ with RFID-RC522 (following this guide https://www.raspberrypi-spy.co.uk/2018/02/rc522-rfid-tag-read-raspberry-pi/). But I got stuck at the hardware ...
2
votes
1answer
179 views

Active Buzzer makes sound on both LOW and HIGH

Goal: I want to replace a status-LED with a status-buzzer I use the same code which worked with the status-LED: (1) on start set buzzer to LOW (2) wait some time, than "blink" once (HIGH 200 ms then ...
0
votes
1answer
28 views

Wireless doorbell using gpiod

Good Morning, I have a non issue that I am just curious how its working. So I have a wireless doorbell that I built. It works using the gpiod and remote gpio. So I have a chime unit that I built with ...
0
votes
0answers
28 views

Connect 3 Raspberry pi using i2c

I'm trying to use i2c to exchange messages between 3 raspberry pi, all of them must receive a message do something and then send a response. Raspberry as an I2C SLAVE From here I came up with a ...
1
vote
1answer
37 views

PIGPIO bit banging UART - SLR to plaintext

I've managed to read UART input by SLRO and SLR commands from pgpiod, however, SLR returns UART bit-banged data in the following format: [number of read bytes] [bytes] http://abyz.me.uk/rpi/pigpio/...
1
vote
1answer
56 views

Pigpio reading sensor returning -83”i2c read failed”

I am testing using my new air quality 5 click sensor with my Raspberry Pi (https://www.mikroe.com/air-quality-5-click) using command line. When I enter i2cdetect -y 1it appears at address 48. Then ...
3
votes
1answer
81 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 ...
2
votes
2answers
55 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? ...
0
votes
1answer
35 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. ...
5
votes
1answer
57 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 ...
0
votes
1answer
39 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 ...
0
votes
0answers
11 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 ...
0
votes
0answers
75 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 ...
0
votes
1answer
78 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 ...
0
votes
0answers
34 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 ...
0
votes
1answer
56 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?
0
votes
0answers
88 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 ...
0
votes
1answer
76 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 ...
0
votes
1answer
92 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 ...
0
votes
0answers
33 views

Stepper motor control using wavechain

I am having a bit of trouble using the PIGPIO wavechain function. I am using wavechain to accelerate and decelerate the stepper motor(NEMA 17 ,A4988 driver).Is it possible to avoid executing the ...
0
votes
0answers
15 views

Frequencies available for wavechaining using PIGPIO library

I am working with the PIGPIO library to run stepper motors. I am using wavechains to the STEP pin of the driver. I need help regarding the possible pulse frequencies available for wavechaining. I ...
0
votes
0answers
47 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 ...
0
votes
2answers
250 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 ...
0
votes
0answers
31 views

Generating multiple square waves simultaneously

I'm trying to generate 2 simultaneous square waves (50% duty cycle PWM signals) to step two stepper motors (STEP signal to separate motor drivers) on the Raspberry Pi Zero W. I use GPIO12 and GPIO19, ...
2
votes
1answer
58 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 ...
0
votes
1answer
829 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 ...
1
vote
0answers
257 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....
0
votes
2answers
272 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
votes
1answer
87 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.
0
votes
1answer
144 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 ...
0
votes
2answers
83 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 (...
0
votes
1answer
144 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 ...
2
votes
0answers
53 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 ...
5
votes
0answers
108 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 ...
1
vote
1answer
199 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 ...
0
votes
1answer
755 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) ...
0
votes
1answer
46 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 ...
2
votes
1answer
315 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 ...
1
vote
1answer
47 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 ...