catena4430-test

This sketch demonstrates the functionality of the MCCI Catena 4430 Feather Wing.

With a Feather-compatible Catena 4710 mounted, the assembly looks like this:

Prior to assembly, the Catena 4430 looks like this:

The Catena 4430 adds the following functions to any compatible Feather-like board.

• Passive Infrared (PIR) motion sensor. This can be mounted on the front or back or the board.

• A battery-backed real-time clock (compatible with Adafruit's Adalogger FeatherWing).

• An SD-card slot similar to the Adalogger, but different in a couple of ways. First the SD-card is electrically buffered going to and from the system; it can't interfere with the SPI bus when you're not usin git. Second, the SD-card slot has a dedicated power supply that is off by default.

• Three additional lights (red, green, and blue).

• A GPIO screw terminal with four posts: two I/O signals, power, and ground. The power at the screw terminal can also be turned on and off under software control.

Functions performed by this sketch

This sketch has the following features.

• During startup, the sketch queries and displays the RTC value.

• It monitors the PIR sensor and continually computes an "activity fraction", by low-pass filtering the PIR with a time constant of one second. Every two seconds, it outputs that data to the USB console. The RTC is used to time-stamp the data. Although the data is logged only once every two seconds, a real time estimate is continually updated.

• The sketch dynamically transfers the PIR signal to the blue LED. This gives a real-time indication of the output of the PIR sensor.

• The sketch flashes the Arduino standard LED (D13), the red LED on the 4430, and the green LED on the 4430. It does this in a circular chasing pattern.

• The sketch uses the Catena Arduino Platform, and therefore the basic provisioning commands from the platform are always availble while the sketch is running. This also allows user commands to be added if desired.

• Futhermore, the McciCatena::cPollableObject paradigm is used to simplify the coordination of the activities described above.

Key classes

cPCA9570 I2C GPIO controller

This class models the hardware of PCA9570 I2C GPIO expander. It has no knowledge of how the PCA9570 is wired up.

c4430Gpios Catena 4430 GPIO Control

This class models the GPIOs of the Catena 4430. It understands the wiring and polarities so that clientscan use method like c4330Gpios::setBlue() to turn on the blue LED.

cPIRdigital PIR monitor class

This class monitors the digital output from the PIR and accumulates an activity estimate.

cTimer simple periodic timer class

This class simplifies the coding of periodic events driven from the Aduino loop() routine.