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Expansion Boards

All of these devices act as Device Factories and should be accessed as such.

ADS112C04 ADC

16-Bit, 4 Channel, 2,000 samples per second delta-sigma ADC.

Datasheet, Javadoc.

ADS1015 / ADS1115 ADC

Ads1x15 Javadoc.

Datasheets:

  • ADS1015 - 3,300 samples per second, 12-Bit, 4 channel ADC Datasheet
  • ADS1115 - 860 samples per second, 16-Bit, 4 channel ADC Datasheet

Microchip Analog to Digital Converters

Provides support for the following Microchip analog-to-digital converter devices:

Usage example: An LDR controlled LED (using a 10kΩ resistor for the LDR and a 220Ω resistor for the LED):

MCP3008 LDR Controlled LED

Code for the above circuit is implemented in LdrControlledLed, the important bit:

try (McpAdc adc = new McpAdc(type, chipSelect); LDR ldr = new LDR(adc, pin, vRef, r1); PwmLed led = new PwmLed(ledPin)) {
	// Detect variations of 5%, taking a reading every 20ms
	ldr.addListener((event) -> led.setValue(1-event.getUnscaledValue()), .05f, 20);
	Logger.debug("Sleeping for 20s");
	SleepUtil.sleepSeconds(20);
}

McpAdc Javadoc.

Microchip MCP23xxx GPIO Expansion Board

Supports MCP23008, MCP23017 and MCP23S17.

An example circuit for controlling an LED with a button, all connected via an MCP23017:

MCP23017 Button controlled LED

Code for the above circuit is implemented in MCP23017Test, the important bit:

try (MCP23017 mcp23017 = new MCP23017(intAPin, intBPin);
		Button button = new Button(mcp23017, inputPin, GpioPullUpDown.PULL_UP);
		LED led = new LED(mcp23017, outputPin)) {
	led.on();
	SleepUtil.sleepSeconds(1);
	led.off();
	SleepUtil.sleepSeconds(1);
	led.blink(0.5f, 0.5f, 10, false);
	button.whenPressed(nanoTime -> led.on());
	button.whenReleased(nanoTime -> led.off());
	Logger.debug("Waiting for 10s - *** Press the button connected to MCP23017 pin {} ***",
			Integer.valueOf(inputPin));
	SleepUtil.sleepSeconds(10);
	button.whenPressed(null);
	button.whenReleased(null);
}

Implementations:

PCA9685 PWM / Servo Driver

Provides support for the PCA9685 12-bit 16-channel PWM driver as used by the Adafruit PWM Servo Driver. Implements PwmOutputDeviceFactoryInterface hence can be passed into the constructor of PWM output devices.

Usage example:

float delay = 0.5f;
try (PwmOutputDeviceFactoryInterface df = new PCA9685(); PwmLed led = new PwmLed(df, pin)) {
	led.setValue(.25f);
	SleepUtil.sleepSeconds(delay);
	led.toggle();
	SleepUtil.sleepSeconds(delay);
	led.setValue(.5f);
	SleepUtil.sleepSeconds(delay);
	led.blink(0.5f, 0.5f, 5, false);
	led.pulse(1, 50, 5, false);
} catch (RuntimeIOException e) {
	Logger.error(e, "Error: {}", e);
}

PCF8574 GPIO Expansion Board

Support for the PCF8574 8-Bit I/O Expander.

PCF8574 Javadoc.

PCF8591 ADC / DAC

Support for the PCF8591 8-bit A/D and D/A converter.

PCF8591 Javadoc.

Picon Zero Intelligent Robotics Controller

Picon Zero.

Javadoc.