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So, in the course of the topic about the drivers for Zephyr, we proceed directly to creating a specific device driver. As a test subject, I have figured out how to write drivers for Zephyr, more or less. I decided to share my experience. Information about this is not so much, so I think someone this may be useful. If this topic is interesting to you, it means you have come to the right place In one of the crafts needed power about 12-15 volts. Like many probably at home lying a bunch of power supplies from old cell phones. But all of them are usually 5 volt. I decided to modify one of these units and raise the voltage to the required one. In one of the comments I was reproached - they say “all is vanity, and here you are, try to blink an LED through bluetooth”. Well - accusation is fair and the challenge is accepted. Beginning a series of articles on programming under zephyr. This article will be the code for a bluetooth device with one LED, which can go to the tests. I thought the flashing LEDs were below my dignity and decided to immediately “go in with the trump cards” and start right away with BLE examples. Well, the most clas*ic is of course BLE beacon. With him and start.