In addition to the local buses, I found the “limousine bus” service, linking Naha Airport to the luxury resorts of the island to be quite convenient. Besides, the staff of the scuba diving centre pick you up to drive to a new dive site each day, so you got to know a lot of the island this way. It is usually recommended to rent a car in Okinawa but decided not to do in the end it as there was already many things to see in Naha and Onna. Local transportation by bus is available but limited. Since most of the dive sites around Okinawa main islands are either in the Kerama Islands National Park, 1h boat ride away from Naha Harbour, or in the northern part of the islands around Onna Village, I decided to share my time between these two places to check how it feels to stay and dive from each. The itinerary for my first trip to Okinawa Island
UTIME OKINAWA SERIES
There are so many islands in the prefecture of Okinawa, so many scuba diving experiences, at different periods of the year: it became somehow overwhelming to answer “What? Where? When?” As this was the first trip of a long series to Okinawa Prefecture, I thought a first-timer guide to scuba diving in Okinawa would make sense! Okinawa is one of these places where it is not so straightforward to organise a scuba diving trip. After the painful events Okinawa went through during WWII, there is no doubt that you are in Japan when you walk in the streets of Naha today, but with a twist. Hence there is a strong Chinese influence in the local Okinawan culture. From the 15 th Century, the Ryukyu Kings were paying tribute to the Chinese Emperor. I know it can be confusing but try to differentiate Okinawa Island, the Okinawa Islands, the Okinawa Prefecture!īefore becoming a Japanese Prefecture in 1879, Okinawa used to be an independent country: the Ryukyu Kingdom. This function turns it into a 16-bit integer which is a value between which is the same range of values that you would receive from the Pico’s analogue pin.The Okinawa Prefecture, in the southernmost province of Japan, counts three main archipelagos: the Okinawa Islands, the Miyako Islands and the Yaeyamaislands, forming all together the Ryukyu Islands.
UTIME OKINAWA FULL
To fix this, so that the potentiometer only reaches full brightness when turned to the very end, the value is converted with the duty_u16 function. However, without conversion, turning the potentiometer slightly may already cause the LED to reach its maximum brightness level. This happens because the analogue value from the potentiometer is used as a value for the PWM signal’s duty cycle, it is a value between 5. Imagine turning the potentiometer, the LED will grow brighter when turned one way. Then, using the freq command, this sets the frequency to modulate the pulse width. An object, onboard_led is created with an activated PWM output on GPIO pin 21. By modulating the width of a pulse, this artificially creates an analogue signal as seen in the following example: import machineįirst, the machine and utime libraries were imported. However, another way is to artificially create an analogue signal, by using pulse-width modulation or PWM for short.īy turning a digital signal on and off, this is known as a pulse. To create an analogue signal, you’d need a digital to analogue converter.
Onboard_led = machine.Pin(25, )Ī microcontroller’s digital output can only be 1 or 0.
UTIME OKINAWA CODE
The full code where the LED will turn on and off can be seen below: import machine To fix this, we need to slow down the program by using the sleep command from the utime library. This is because the Pico works very fast, so the LED lights up faster than you can perceive with the eye. However, you may realise that nothing seems to happen. To continue on, in the following code, we are telling the Pico to then set its pin value at GPIO 25 to 1, or ‘on’. The second parameter sets it as an output pin rather than an input pin, doing so, the pin knows what it should be doing: onboard_led = machine.Pin(25, )
Then call the Pin function using the machine library to handle the Pin’s GPIO pin, in this case we’re setting up the Pin at GPIO 25, so it is the first parameter. To control it, first import the necessary libraries: import machine import utime
These are called general purpose input output (GPIO) pins and the on-board LED can be found on GPIO 25. To control hardware, the Pico talks to the series of pins along both its edges.
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