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Archive for the ‘tutorials’ Category

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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Video tutorials: Building the Arduino based data loggers

Friday, June 22nd, 2018

https://www.youtube.com/watch?v=FZFAcZmmxHA&list=PL79ZjHgoYtfzvDKPADJH7HPYDFFlxSLXt From the comments on our Arduino data logger post: A visiting researcher dropped by our humble basement workshop with questions about the physical skill level students would need if they added one of our DIY data loggers to their environmental curriculum. I figured the easiest way to cover that was...

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Posted in Arduino, tutorials | 2 Comments »

Tutorial: Setting up a low cost QRP (FT8, JT9, WSPR etc) monitoring station with an RTL-SDR v3 and Raspberry pi 3

Tuesday, June 19th, 2018

A detailed tutorial on how to set up a cheap QRP monitoring station using an RTL-SDR V3 and a Raspberry Pi 3 from rtl-sdr.com This tutorial is inspired by dg0opk's videos and blog post on monitoring QRP with single board computers. We'll show you how to set up a super cheap...

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Posted in R-Pi, RF, tutorials | No Comments »

5 LDO regulator considerations other than voltage and current

Monday, June 4th, 2018

James Lewis over at Bald Engineer writes, "For an AddOhms series, I created a DIY Arduino I am calling the “Pyramiduino.” It is an ATmega328p based board in the shape of a triangle. Other than being cute, the shape does not offer any other benefit. The design features a 3.3...

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Posted in Arduino, tutorials | 2 Comments »

Arduino time attendance system with RFID

Tuesday, May 29th, 2018

A how-to on building a time attendance system with MFRC522 RFID Reader and Arduino from Random Nerd Tutorials: Before getting started it’s important to layout the project main features: *It contains an RFID reader that reads RFID tags; *Our setup has a real time clock module to keep track of time; *When...

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Posted in Arduino, RFID, tutorials | No Comments »

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