What kind of battery charger would YOU like?

A wearable LED controller. The controller supports Arduino IDE and works with Adafruit Neopixel LED strips and library. All powered by 2x AA batteries.

Some of the latest Microchip AVRs require a UPDI programmer. This guide will show you how to build your own Arduino based programmer using jtag2updi.

Many of us want to receive regularly a picture of a place, which can be a beach for activity, a second house, a place in mountain for hiking or biking. Also, it can monitor a house under construction or other daily monitoring needed.

Display air dust situation as well as temperature and humidity:

easy to made crossover

A GPS assisted 10 MHz frequency reference with 0.002Hz accuracy controlled by an Arduino Nano

Do you miss the beat, the four on the floor when the guitar player is alone on stage? What he needs is a stompbox.

A simple device for secure transportation of OTP keycards, solves the problem of secure distribution of encryption keys. Tampering will be detected.

A simple Platino based soldering station for not too demanding (hobbyist) applications. Temperature range of 90 – 450 degrees Celsius with temperature readout on an LCD.

Breakout board for AMS I2C ENS210 humidity/temperature sensor

My mother needs twice a day an alarm set to 3 minutes. Instead of always configuring the alarm on a phone or egg cooker to 3 minutes, I decided to make a simple alarm box, which triggers at a fixed time of 3 minutes.

Little breakout board for the BME280 "weather" sensor by Bosch Sensortec supporting I2C and SPI.

Interface from VHF-AIS-Receiver to WiFi for use with the iSailor App on my iPad

In diesem Projekt wird das Licht einer konventionellen Hausverdrahtung mit einer Smarthome-Komponente erweitert. Dabei wird ein Stromstoß-Relais eingesetzt, dass mit Hilfe des Raspberry Pi gesteuert wird. Der restliche Teil der Verdrahtung besteht aus klassischen Wechsel- und Kreuzschalter.

This USB powered thermometer based on an Arduino Nano shows the temperature using a vintage Russian "nixie" style IN-9 bargraph tube.

The 2018 Elektor Labs Summer Contest is about PCB order pooling. Tell us who your favourite pooling service provider is and why and maybe win a gift certificate. CLOSED

The Unit measure and control the current from tow separates USB I/O Ports. Each Port can be powered from an USB Input Port or from an external 5V Power Supply. The display shows the measured current and voltage from the USB Ports and the state of warning level. Also the display shows the actual power source.

ESP8266 controlled. Text, scroll delay and brightness can be changed with your smartphone or any other mobile device

I repaired a chinese grid tie inverter for small solar systems, Input 50-100V, Output 230V 300W. The failure was in the reference voltage inside the µC ATMega8, it dropped down arbitrary. To be able to find this failure, I had to re-engineer the complete set and had to draw the schematics by my own.

Using a current transducer with galvanic isolation between input and output this circuit can be used for safe measurements of currents up to 25 A rms