All articles by Heikki Hietala

Arduino, grove, Seeed studio

Back in business with the Seeedstudio Grove Arduino kit

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Hi all, it’s time to return to the mines and start delving for more fun and educational Arduino stuff! In … More Back in business with the Seeedstudio Grove Arduino kit →

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8mm film

Documentation images for the Kotokino Mark IV scanner

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I was asked to provide more detailed images of the Kotokino Mark IV telecine machine, so I shot a dozen … More Documentation images for the Kotokino Mark IV scanner →

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3D printing, ESP32 development board, Internet of Things (IoT), IoT web interface, L298H bridge

The Donald Duck hypnotizing machine with IoT

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Note – the full code is available on my GitHub page, so I will only illustrate portions of it here. … More The Donald Duck hypnotizing machine with IoT →

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Android app development, ESP32 development board, Heltec OLED, L293D motor driver, UDP protocol

Using the UDP protocol with an ESP32 and Android Studio, Part 4

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I gather that you have already seen part 1, part 2, and part 3, and are just as surprised as … More Using the UDP protocol with an ESP32 and Android Studio, Part 4 →

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Android app development, ESP32 development board, Heltec OLED, UDP protocol

Using the UDP protocol with an ESP32 and Android Studio, Part 3

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In the previous episodes of this trilogy, I showed you the general idea of using UDP (User Datagram Protocol) to … More Using the UDP protocol with an ESP32 and Android Studio, Part 3 →

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7 segment display, LED, MAX7219, shift registers

Using 7 Segment LED displays, Part 4 – dual quadruple units

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Okay, I thought the series on 7 segment LED displays would run into three parts, but it has turned out … More Using 7 Segment LED displays, Part 4 – dual quadruple units →

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7 segment display, Arduino, buck down converters, LED, shift registers, TPIC6B595N

Using 7 Segment LED displays, Part 3

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This part concludes my foray into segmented LEDs. Part 1 showed you how to work with single digits, part 2 … More Using 7 Segment LED displays, Part 3 →

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Android app development, ESP32 development board, Heltec OLED, UDP protocol

Using the UDP protocol with an ESP32 and Android Studio, Part 2

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In the first episode of this three part saga, I gave you a basic overview of the workflow when working … More Using the UDP protocol with an ESP32 and Android Studio, Part 2 →

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ESP32 development board, Heltec OLED, LED

How to use the Heltec OLED display on the ESP32

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Heltec is a Chinese company that makes all kinds of SoC (system on a chip) devices. Their ESP32-based SoCs appear … More How to use the Heltec OLED display on the ESP32 →

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Android app development, ESP32 development board, Heltec OLED, UDP protocol

Using the UDP protocol with an ESP32 and Android Studio, Part 1

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The ESP32 is a wonderfully versatile tool. As it has WLAN and Bluetooth on chip by default, as well as … More Using the UDP protocol with an ESP32 and Android Studio, Part 1 →

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