@stheine/pigpiod

Node.js interface for pigpiod on the Raspberry Pi Zero, 1, 2, or 3.

Contents

Features

Installation

Step 1

This step can be skipped on Raspbian Jessie 2016-05-10 or newer as it includes the pigpio C library and pigpiod.

The pigpio package is based on the pigpio C library so the C library needs to be installed first. Version V41 or higher of the pigpio C library is required. It can be installed with the following commands:

wget abyz.me.uk/rpi/pigpio/pigpio.zip
unzip pigpio.zip
cd PIGPIO
make
sudo make install

Step 2

npm install @stheine/pigpiod

I have developed and tested on Node.js 6.2.0, so it should be working ok here. It might very well work on the earlier versions of Node.js.

Usage

const pigpiod = require('@stheine/pigpiod');

let pi  = pigpiod.pigpio_start();
let spi = pigpiod.spi_open(pi, 0); // SPI channel 0

// read A-D converter value on MCP3204 on SPI channel 0, MCP channel 0
const a2dValue = pigpiod.mcp3204(pi, spi, 0);
console.log(`a2dValue = ${a2dValue}`);

// DHT22 (this is a C-based implementation reading the sensor data)
dhtResult = pigpiod.dht22(pi, 18); // read DHT22 sensor on port 18
console.log(dhtResult);

pigpiod.spi_close(pi, spi);
pigpiod.pigpio_stop(pi);

Standard pigpiod API

Following APIs are already implemented. See for details: http://abyz.co.uk/rpi/pigpio/pdif2.html

Where not explicitly stated, the parameters are the same.

The error handling is different, though: Instead of returning an error code, an exception is thrown.

	ESSENTIAL
[x]	pigpio_start	Connects to a pigpio daemon
[x]	pigpio_stop	Disconnects from a pigpio daemon

	BEGINNER
[x]	set_mode	Set a GPIO mode
[x]	get_mode	Get a GPIO mode
[x]	set_pull_up_down	Set/clear GPIO pull up/down resistor
[x]	gpio_read	Read a GPIO
[x]	gpio_write	Write a GPIO
[ ]	set_PWM_dutycycle	Start/stop PWM pulses on a GPIO
[ ]	get_PWM_dutycycle	Get the PWM dutycycle in use on a GPIO
[ ]	set_servo_pulsewidth	Start/stop servo pulses on a GPIO
[ ]	get_servo_pulsewidth	Get the servo pulsewidth in use on a GPIO
[x]	callback	Create GPIO level change callback
[ ]	callback_ex	Create GPIO level change callback
[x]	callback_cancel	Cancel a callback
[ ]	wait_for_edge	Wait for GPIO level change

	INTERMEDIATE
[ ]	gpio_trigger	Send a trigger pulse to a GPIO.
[x]	set_watchdog	Set a watchdog on a GPIO.
[ ]	set_PWM_range	Configure PWM range for a GPIO
[ ]	get_PWM_range	Get configured PWM range for a GPIO
[ ]	set_PWM_frequency	Configure PWM frequency for a GPIO
[ ]	get_PWM_frequency	Get configured PWM frequency for a GPIO
[ ]	read_bank_1	Read all GPIO in bank 1
[ ]	read_bank_2	Read all GPIO in bank 2
[ ]	clear_bank_1	Clear selected GPIO in bank 1
[ ]	clear_bank_2	Clear selected GPIO in bank 2
[ ]	set_bank_1	Set selected GPIO in bank 1
[ ]	set_bank_2	Set selected GPIO in bank 2
[ ]	start_thread	Start a new thread
[ ]	stop_thread	Stop a previously started thread

	ADVANCED
[ ]	get_PWM_real_range	Get underlying PWM range for a GPIO
[ ]	notify_open	Request a notification handle
[ ]	notify_begin	Start notifications for selected GPIO
[ ]	notify_pause	Pause notifications
[ ]	notify_close	Close a notification
[ ]	bb_serial_read_open	Opens a GPIO for bit bang serial reads
[ ]	bb_serial_read	Reads bit bang serial data from a GPIO
[ ]	bb_serial_read_close	Closes a GPIO for bit bang serial reads
[ ]	bb_serial_invert	Invert serial logic (1 invert, 0 normal)
[ ]	hardware_clock	Start hardware clock on supported GPIO
[ ]	hardware_PWM	Start hardware PWM on supported GPIO
[x]	set_glitch_filter	Set a glitch filter on a GPIO
[x]	set_noise_filter	Set a noise filter on a GPIO

	SCRIPTS
[ ]	store_script	Store a script
[ ]	run_script	Run a stored script
[ ]	script_status	Get script status and parameters
[ ]	stop_script	Stop a running script
[ ]	delete_script	Delete a stored script

	WAVES
[ ]	wave_clear	Deletes all waveforms
[ ]	wave_add_new	Starts a new waveform
[ ]	wave_add_generic	Adds a series of pulses to the waveform
[ ]	wave_add_serial	Adds serial data to the waveform
[ ]	wave_create	Creates a waveform from added data
[ ]	wave_delete	Deletes one or more waveforms
[ ]	wave_send_once	Transmits a waveform once
[ ]	wave_send_repeat	Transmits a waveform repeatedly
[ ]	wave_send_using_mode	Transmits a waveform in the chosen mode
[ ]	wave_chain	Transmits a chain of waveforms
[ ]	wave_tx_at	Returns the current transmitting waveform
[ ]	wave_tx_busy	Checks to see if the waveform has ended
[ ]	wave_tx_stop	Aborts the current waveform
[ ]	wave_get_micros	Length in microseconds of the current waveform
[ ]	wave_get_high_micros	Length of longest waveform so far
[ ]	wave_get_max_micros	Absolute maximum allowed micros
[ ]	wave_get_pulses	Length in pulses of the current waveform
[ ]	wave_get_high_pulses	Length of longest waveform so far
[ ]	wave_get_max_pulses	Absolute maximum allowed pulses
[ ]	wave_get_cbs	Length in cbs of the current waveform
[ ]	wave_get_high_cbs	Length of longest waveform so far
[ ]	wave_get_max_cbs	Absolute maximum allowed cbs

	I2C
[ ]	i2c_open	Opens an I2C device
[ ]	i2c_close	Closes an I2C device
[ ]	i2c_write_quick	smbus write quick
[ ]	i2c_write_byte	smbus write byte
[ ]	i2c_read_byte	smbus read byte
[ ]	i2c_write_byte_data	smbus write byte data
[ ]	i2c_write_word_data	smbus write word data
[ ]	i2c_read_byte_data	smbus read byte data
[ ]	i2c_read_word_data	smbus read word data
[ ]	i2c_process_call	smbus process call
[ ]	i2c_write_block_data	smbus write block data
[ ]	i2c_read_block_data	smbus read block data
[ ]	i2c_block_process_call	smbus block process call
[ ]	i2c_write_i2c_block_data	smbus write I2C block data
[ ]	i2c_read_i2c_block_data	smbus read I2C block data
[ ]	i2c_read_device	Reads the raw I2C device
[ ]	i2c_write_device	Writes the raw I2C device
[ ]	i2c_zip	Performs multiple I2C transactions
[ ]	bb_i2c_open	Opens GPIO for bit banging I2C
[ ]	bb_i2c_close	Closes GPIO for bit banging I2C
[ ]	bb_i2c_zip	Performs multiple bit banged I2C transactions

	SPI
[x]	spi_open	Opens a SPI device
[x]	spi_close	Closes a SPI device
[ ]	spi_read	Reads bytes from a SPI device
[ ]	spi_write	Writes bytes to a SPI device
[x]	spi_xfer	Transfers bytes with a SPI device

| | SERIAL | | --- | --- | --- | | [x] | serial_open | Opens a serial device (/dev/tty*) | | [x] | serial_close | Closes a serial device | | [x] | serial_write_byte | Writes a byte to a serial device | | [x] | serial_read_byte | Reads a byte from a serial device | | [x] | serial_write | Writes bytes to a serial device | | [x] | serial_read | Reads bytes from a serial device | | [x] | serial_data_available | Returns number of bytes ready to be read |

	CUSTOM
[ ]	custom_1	User custom function 1
[ ]	custom_2	User custom function 2

	UTILITIES
[x]	get_current_tick	Get current tick (microseconds)
[x]	get_hardware_revision	Get hardware revision
[x]	get_pigpio_version	Get the pigpio version
[ ]	pigpiod_if_version	Get the pigpiod_if2 version
[ ]	pigpio_error	Get a text description of an error code.
[1]	time_sleep	Sleeps for a float number of seconds
[2]	time_time	Float number of seconds since the epoch

1: use js setTimeout() instead.

2: use moment() or Date() instead.

API documentation

Thanks

pigpio library and pigpiod Thanks to joan2937 for the development and documentation of the pigpio C library.

pigpio Thanks for fivdi for his work on the pigpio module for Node.js. I used this as the base for my development and got additional development help.

Breaking change

1.0.0

The dht22 call has been switched to an asynchronous implementation, returning a promise.

2.0.0

I have to revert the changes released in 1.0.0, as the async dht22 API works fine in a standalone example, but causes intermittent process hangs in a project using additional API calls.