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Archive for the ‘tutorials’ Category

ESP32 DHT11/DHT22 web server – Temperature and humidity using Arduino IDE

Wednesday, April 3rd, 2019

A how-to on building an asynchronous ESP32 web server with the DHT11 or DHT22 that displays temperature and humidity using Arduino IDE. More details on Random Nerd Tutorials. Check out the video after the break. (more…)

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Wifi based DIY 5V switcher for led-lights

Friday, March 15th, 2019

Albert posted a detailed how-to on building DIY ESP-12F based USB-5V switcher: 5V powered 100LED circuit was consuming around ~1.8Watts(though 5.1Ohm series resistor was really hot) and the brightness of the LED's were not bad, especially difference between first led and last led brightness didnt bother me it was hardly noticeable...

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So how to do CW on a homebrew SSB rig?

Wednesday, March 13th, 2019

Pete Juliano, N6QW, has written an article on how to do CW on a homebrew SSB rig: The Answer is Not a Flippant: Carefully! Author's note: A friend in VK4 land made an inquiry about CW operation. I find that 99.99% of my operating time is SSB. But others spend...

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Remote debugging with USB based JTAG/SWD debug probes

Friday, March 8th, 2019

Erich Styger wrote an article on how to turn a USB debug probe into a IP-based debug solution: For some projects it is not possible to have the device under debug available on my desk: the board might be in another room, on another site or in a place where...

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Solar powered WiFi weather station

Tuesday, January 29th, 2019

A detailed instructions of how to build this weather station project by Open Green Energy: This Instructable is a continuation to my earlier weather station project. It was quite popular on the web, people around the globe made their own by following it and given valuable feedbacks for improvement.By taking consideration in...

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Tutorial: Booting the NXP i.MX RT from Micro SD card

Wednesday, January 23rd, 2019

Erich Styger has written an article on how to boot the NXP i.MX RT from Micro SD card: It is a common thing to boot a Linux system (see the Raspberry Pi) from a micro SD card. It is not that common for a microcontroller. The NXP i.MX RT ARM Cortex-M7 fills...

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DIY Arduino based RC transmitter

Monday, January 14th, 2019

  Dejan over at HowToMechatronics posted a detailed how-to on building DIY Arduino RC transmitter: Now I can wirelessly control any Arduino project with just some small adjustments at the receiver side. This transmitter can be also used as any commercial RC transmitter for controlling RC toys, cars, drones and so...

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Regaining debug access of NXP i.MX RT1064-EVK executing WFI

Thursday, January 3rd, 2019

Erich Styger writes: Working with low power modes can be challenging. It can severely affect debugging capabilities of a microprocessor or microcontroller. I ported a FreeRTOS application using the Tickless Idle Mode to the NXP i.MX RT1064 board, and all of a sudden, the board was unresponsive to any debugger...

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SerialDebug Library for Arduino

Wednesday, November 21st, 2018

Rui Santos over at Random Nerd Tutorials wrote a series of three posts on how to use the SerialDebug library created by João Lopes with Arduino IDE (programming Arduino, ESP32, ESP8266): After programming the ESP32 using ESP-IDF, João noticed that debug for Arduino IDE needed some improvement. So, he created...

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Relays (DC): 99.9% less power and latching option

Thursday, November 1st, 2018

Technovative writes, "The purpose of this article, is to show a simple method to increase the power efficiency, and functionality, of standard DC actuated electromagnetic relay switches." Project instructables here.

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Tutorial: Git with Eclipse

Friday, October 19th, 2018

A detailed tutorial on Eclipse with the EGit plugin by Erich Styger: There are things which are game changer in the world of software development: one such event was when I started using a VCS (Version Control System): it changed for me how I keep and store my projects and settings. It...

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Tutorial: Adding the SSD1306 OLED screen to an Arduino logger (without a library)

Thursday, October 18th, 2018

Edward Mallon writes: While I loved the Nokia 5110 LCD's readability in full sun, the pressure sensitivity was a real problem for the underwater units. So I started noodling around with some cheap OLED screens from eBay. With the exception of the init & XY functions (which are more complicated...

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ESP32 AM radio transmitter

Friday, October 12th, 2018

A how-to on making a simple AM radio transmitter using the ESP32 microcontroller by Bitluni: AM Radio transmissions are based on a carrier signal which is modulated by the audio signal. It’s a very basic principle but prone to noise from the environment. Using the ESP32 it is really simple...

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Build a Multisensor Shield for ESP8266

Monday, September 10th, 2018

Rui Santos has a great write-up on building a Multisensor Shield for ESP8266, that is available on GitHub: In this project you’ll discover how to design and create a Multisensor Shield for the ESP8266 Wemos D1 Mini board. The shield has temperature sensor (DS18B20), a PIR motion sensor, an LDR,...

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Tutorial: Using the Arduino’s internal EEprom to store calibration data and LCD screen fonts

Tuesday, August 28th, 2018

Edward Mallon writes: This is a follow-up to our post about using Nokia 5110 screens on three unused analog lines with shift-out. That saved me from messing with the hardware SPI bus which we reserve for the SD cards. A secondary benefit is that the code is really lean, on...

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How to use I2C LCD with ESP32 on Arduino IDE

Thursday, July 19th, 2018

A how-to on using an I2C LCD display with the ESP32 using Arduino IDE from Random Nerd Tutorials: This tutorial shows how to use the I2C LCD (Liquid Crystal Display) with the ESP32 using Arduino IDE. We’ll show you how to wire the display, install the library and try sample...

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Dual ultrasonic sensors combine for 2D echolocation

Friday, July 13th, 2018

A how-to on making a Dual-sensor ultrasonic echo locator by lingib, project instructables here: This instructable explains how to pinpoint the location of an object using an Arduino, two ultrasonic sensors, and Heron’s formula for triangles. There are no moving parts. Heron’s formula allows you to calculate the area of any triangle...

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ESP32 with multiple DS18B20 temperature sensors

Monday, July 9th, 2018

Guide to ESP32 with multiple DS18B20 temperature sensors from Random Nerd Tutorials: This guide shows how to read temperature from multiple DS18B20 temperature sensors with the ESP32 using Arduino IDE. We’ll show you how to wire the sensors on the same data bus to the ESP32, install the needed libraries, and...

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EEPROM rotation for ESP8266 and ESP32

Wednesday, June 27th, 2018

Xose Pérez over at Tinkerman writes: The Arduino Core for ESP8266 and ESP32 uses one SPI flash memory sector to emulate an EEPROM. When you initialize the EEPROM object (calling begin) it reads the contents of the sector into a memory buffer. Reading a writing is done over that in-memory...

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Posted in code, tutorials | 4 Comments »

Amiga 500 power supply build

Tuesday, June 26th, 2018

A how-to on building an Amiga 500 power supply from Inkoo Vintage Computing: The power supply of my Amiga 500 is a bit unreliable. I’ve had some issues with the machine where the PSU could be the culprit, so I thought that it would be better to get a new power supply. There...

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