This is a little weather monitor. It has a 2.2" color display and is powered by an AVR and the ESP8266. Read more

A nother commom issue is timekeeping. This little module contains a DS3231 (or DS3232 with RAM) and the backup battery. Read more

Measuring current in a design used to be a bit tricky. But with modern semiconductors this is no more effort than a tiny module with an I2C bus. It only needs three resistors and two capacitors. I used this IC in the Read more

My first attempt using an AVR together with the USB port. It's an HID keyboard device featuring a num lock LED and num lock key. Read more

Sometimes when handling AVRs something happens that is known as "bricking" a device. Read more

This is a micro Tetris. It features a fully functional Tetris programmed in C with the free TI Code Composer Studio. Read more

This project is a small board containing a CPLD and a SRAM IC. It has an SPI interface to utilize the SRAM. The CPLD is used to implement the SPI interface and address the SRAM. Read more

This module contains a micro SD card, 32Kbyte serial SRAM and an ATmega644 and has the size of a standard SD card.Obviously nowadays any modern CPU can easely drive a sdcard asside process. Read more

The device is built out of two servos. One provides the rotation and the other the tilt. It can be used for example to point at the date on a wall calender (sample below). Read more

This is a prototype that implements the concept of a physical progress bar. It is based on a motorized studio fader that is connected to a microcontroller. Read more

This is the third and final galvanic insulator in my little series. It provides an insulated UART with TTL levels. It was tested up to 256K baud. Read more

For some areas like medical equipment or test equipment it is required to galvanically insolate the peripheral from the PC. This little device serves this purpose.