Camel Pi4j component

Camel Pi4j component can be used to manage GPIO and I2C bus features from Raspberry Pi. This component uses pi4j library

Maven dependency

Maven users should add the following dependency to their POM file:

io.rhiotcamel-pi4j${rhiot.version}

Avaliable for rhiot.version >= 0.1.1

URI format for GPIO

pi4j-gpio://gpioId[?options]

gpioId must match [A-Z_0-9]+ pattern. By default, pi4j-gpio uses RaspiPin Class, change it via gpioClass property You can use static field name "GPIO_XX", pin name "GPIO [0-9]" or pin address "[0-9]"

Optional URI Parameters

Parameter	Default value	Description
gpioId
state		Digital Only: if input mode then state trigger event, if output then started value
mode	DIGITAL_OUTPUT	To configure GPIO pin mode, Check Pi4j library for more details
action		Default : use Body if Action for output Pin (TOGGLE, BUZZ, HIGH, LOW for digital only) (HEADER digital and analog)
value	0	Analog or PWN Only
shutdownExport	true	To configure the pin shutdown export
shutdownResistance	OFF	To configure the pin resistance before exit program
shutdownState	LOW	To configure the pin state value before exit program
pullResistance	PULL_UP	To configure the input pull resistance, Avoid strange value for info http://en.wikipedia.org/wiki/Pull-up_resistor
gpioClass	com.pi4j.io.gpio.RaspiPin	class<com.pi4j.io.gpio.Pin> pin implementation
controller	com.pi4j.io.gpio.impl.GpioControllerImpl	instance of <com.pi4j.io.gpio.GpioController> GPIO controller instance, check gpioClass pin implementation to use the same

Consuming:

from("pi4j-gpio://13?mode=DIGITAL_INPUT&state=LOW")
.to("log:default?showHeaders=true");

Producing

from("timer:default?period=2000")
.to("pi4j-gpio://GPIO_04?mode=DIGITAL_OUTPUT&state=LOW&action=TOGGLE");

When using producer you can also set or override action using message header with a key of Pi4jConstants.CAMEL_RBPI_PIN_ACTION

from("timer:default?period=2000")
.process(exchange -> exchange.getIn().setHeader(Pi4jConstants.CAMEL_RBPI_PIN_ACTION, "LOW"))
.to("pi4j-gpio://GPIO_04?mode=DIGITAL_OUTPUT&state=LOW&action=TOGGLE");

Simple button w/ LED mode

Plug an button on GPIO 1, and LED on GPIO 2 (with Resistor) and code a route like this

from("pi4j-gpio://1?mode=DIGITAL_INPUT&state=HIGH").id("switch-led")
.to("pi4j-gpio://2?&action=TOGGLE");

URI format for I2C

pi4j-i2c://busId/deviceId[?options]

Optional URI Parameters

Parameter	Default value	Description
busId		i2c bus
deviceId		i2c device
address	0x00	address to read
readAction		READ, READ_ADDR, READ_BUFFER, READ_ADDR_BUFFER
size	-1
offset	-1
bufferSize	-1
driver		cf available i2c driver

I2C component is really simplistic, the consumer endpoint reads a single byte, or to a buffer of bytes directly from the device. The producer writes 1 or more bytes.

For smarter devices, you must implement a driver.

i2c driver

Driver	Feature
bmp180	Temperature and Pressure sensor (http://www.adafruit.com/products/1603)
tsl2561	Light sensor (http://www.adafruit.com/products/439)
lsm303-accel	Accelerometer sensor (http://www.adafruit.com/products/1120)
lsm303-magne	Magnetometer sensor (http://www.adafruit.com/products/1120)
mcp23017-lcd	LCD 2x16 char (http://www.adafruit.com/products/1109)
hts221	Humidity and Temperature sensor used by the Official RaspberryPi Sense-Hat ST device doc
lps25h	Pressure and Temperature sensor used by the Official RaspberryPi Sense-Hat ST device doc