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Archive for the ‘tutorials’ Category

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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Posted in Arduino, tutorials | No Comments »

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...

Posted in Arduino, sensors, tutorials | No Comments »

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 »

DIY Moteino guide

Thursday, April 26th, 2018

Felix writes, "I posted a short illustrated guide for making your own Moteino from SMD components. It also includes details how to burn the bootloader and fuses. Check it out here. Thanks and credit goes to forum user LukaQ for his contribution of the images and test sketches in this...

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Posted in DIY, tutorials | No Comments »

How servo motors work and how to control servos using Arduino

Tuesday, April 24th, 2018

Dejan Nedelkovski over at HowToMechatronics shared detailed tutorial on how servo motors work and how to control servos using Arduino and PCA9685 PWM driver: There are many types of servo motors and their main feature is the ability to precisely control the position of their shaft. A servo motor is...

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Posted in Arduino, tutorials | 3 Comments »

Why electrolytic capacitors are actually kinda shitty

Wednesday, March 28th, 2018

Afroman writes, "Electrolytic capacitors are common, but knowledge of their limitations is uncommon. A demonstration is shown highlighting the difference in performance between electrolytic and ceramic capacitors in power supplies. Other topics discussed in the video: Electrolytic capacitor construction, ceramic capacitors, ESR, ESL, impedance curves, why “0.1uF”, and more." Via Afrotechmods....

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Posted in tutorials | 2 Comments »

Alexa (Echo) with ESP32 and ESP8266 – Voice controlled relay

Tuesday, March 27th, 2018

Rui Santos writes, "In this project, you’re going to learn how to control the ESP8266 or the ESP32 with voice commands using Alexa (Amazon Echo Dot). As an example, we’ll control two 12V lamps connected to a relay module. We’ll also add two 433 MHz RF wall panel switches to...

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Posted in tutorials, wireless | No Comments »

DIY Arduino PCB Pryamiduino

Wednesday, March 7th, 2018

A how-to on designing a DIY Arduino PCB Pryamiduino from Bald Engineer: Continuing the DIY Arduino tutorial series, this AddOhms episode shows how to create a PCB in KiCad. I make a joke that the original design was a rectangle, which I found boring and pointless. So instead, I designed a...

Posted in PCBs, tutorials | No Comments »

Debug SONOFF AC relay with a thermal camera

Tuesday, February 27th, 2018

James Lewis shares his experience in debugging SONOFF AC relay with a thermal camera: The clever solution seemed to be clever, at least for a few minutes. Suddenly the light turned off. I thought maybe there was a timeout for the manual button. Annoying, but workable. The lamp remained off for...

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Posted in measurement, tutorials | 2 Comments »

ESP8266 Wi-Fi button – DIY Amazon dash button clone

Wednesday, January 24th, 2018

Rui Santos over at Random Nerd Tutorials posted a step by step guide on building an ESP8266 Wi-Fi button: In this project you’re going to build an ESP8266 Wi-Fi Button that can trigger any home automation event. This is like a remote control that you can take in your pocket...

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Arduino Tutorial: Adding sensors to your data logger

Monday, January 15th, 2018

Edward Mallon writes: This post isn’t another How-To tutorial for a specific sensor because the Arduino community has already produced a considerable number of resources like that.  You’d be hard pressed to find any sensor in the DIY market that doesn’t give you a dozen cookbook recipes to follow after...

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Posted in Arduino, tutorials | No Comments »

Yet another ARM development tutorial

Tuesday, January 9th, 2018

ARM development tutorial at smdprutser.nl: It has been a while since I wrote about ARM development. I recently made a Black Magic Probe (BMP) clone which acts different then the original. The BMP can source power to the target, but on my version control signal is inverted. Not a big...

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ESP8266 voltage regulator (LiPo and Li-ion batteries)

Tuesday, December 5th, 2017

Rui Santos writes, "In this guide, you’re going to build a voltage regulator for the ESP8266 that can be used with LiPo and Li-ion batteries." More details at RandomNerdTutorials.com. Check out the video after the break. (more…)

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Posted in tutorials | 5 Comments »

ESP8266 Deep Sleep with Arduino IDE

Monday, October 30th, 2017

Rui Santos has written a great guide shows us what’s Deep Sleep and how to use it with the ESP8266 in the Arduino IDE. With most of the ESP8266 modules, you can’t change the hardware to save power, but you can write software to do it. If you use the...

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Posted in Arduino, tutorials | 2 Comments »

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