Oak

🌳 Outdoor LoRa-GPS tracker with E-Ink display 🔑

power 18650
wireless LoRa,
sensor GPS, E-Ink
mcu SAMD21G18
bom items 82
bom cost USD $78.93
vendors 6
completed February 2022

Hello world blinky

blinky LED easy

Hello world with Blinky LED


Details

Start with this sketch that will blink the on-board LED.

Alternate Makefile

BOARD?=arduino:samd:arduino_zero_native
PORT := $(shell ls /dev/cu.usbmodem*)
BUILD=build

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright,-whitespace/line_length,-readability/casting,-readability/todo,-runtime/int *.ino

all:
	# This custom PCB does not have a crytal on pins PA00 and PA01
	# Hence, use -DCRYSTALLESS to replace the extra_flags in boards.txt
	arduino-cli compile --fqbn $(BOARD) --build-properties build.extra_flags="-DCRYSTALLESS -D__SAMD21G18A__ {build.usb_flags}"  --output-dir $(BUILD) ./

flash:
	arduino-cli upload -p $(PORT) --fqbn $(BOARD) --input-dir $(BUILD) --verbose

clean:
	rm -r build

Steps

  1. Plug in the Oak PCB to the computer
  2. (Option A) Ensure the PCB can be detected with ls -al /dev/cu.usbmodem and arduino-cli board list. Run make to compile and upload the code to the board. (Option A) Ensure the PCB can be detected with <code>ls -al /dev/cu.usbmodem</code> and <code>arduino-cli board list</code>. Run <code>make</code> to compile and upload the code to the board.
  3. (Option B) Ensure the board can be detected with Arduino IDE. Compile and upload the code to the board. (Option B) Ensure the board can be detected with Arduino IDE. Compile and upload the code to the board.
  4. Watch the Blinky LED the board is battery-powered or USB-powered.

Serial console

Serial output from the firmware.

Code

Download code
// PA14 is Pin 2
// https://github.com/arduino/ArduinoCore-samd/blob/master/variants/arduino_zero/variant.cpp#L26
#define LEDPIN 2

void setup() {
  pinMode(LEDPIN, OUTPUT);
  SerialUSB.begin(9600);
}

void loop() {
  digitalWrite(LEDPIN, HIGH);
  SerialUSB.println("HIGH");
  delay(2000);

  digitalWrite(LEDPIN, LOW);
  SerialUSB.println("LOW");
  delay(2000);
}

Makefile

BOARD?=hutscape:samd:oak
PORT := $(shell ls /dev/cu.usbmodem*)
BUILD=build

.PHONY: default lint all flash clean

default: lint all flash clean

lint:
	cpplint --extensions=ino --filter=-legal/copyright,-whitespace/line_length,-readability/casting,-readability/todo *.ino

all:
	arduino-cli compile --fqbn $(BOARD) --output-dir $(BUILD) ./

flash:
	arduino-cli upload -p $(PORT) --fqbn $(BOARD) --input-dir $(BUILD) --verbose

clean:
	rm -r build

References

Photos

Hello world blinky Photo 1
Hello world blinky Photo 2
Hello world blinky Photo 3