Archives: Projects

This is an “Audio VU Meter” or “Sound Level Meter”, it is a general-purpose bar-graph Audio VU meter designed for fun projects. All you need is to hook up one wire to the output of the audio amplifier’s speaker pin along with GND and see the magic. The response of the...

While full-time embedded firmware developers like me may always have one thing or the other against the Arduino IDE, the truth is, the IDE remains one of the most versatile and widely used embedded development platforms in the world today. The success of the Arduino boards and related...

The project presented here is a photodiode amplifier for visible light. The output voltage of the circuit increases linearly with light intensity. Low-cost BPW34 photodiode is used as a light sensor and OPA381 op-amp as an amplifier. OPA381 is a transimpedance amplifier that converts...

In recent tutorials, we have highlighted how useful the ATtiny series of microcontrollers are, thanks to their tiny form factor and a decent amount of processing power, which makes them good choice for projects. where keeping a small device form factor is desired. One other feature that...

This project has 2 outputs that enable us to power up 2 USB devices simultaneously from an input supply of 12-30V DC. The idea of this project is to have safe power for USB powered devices. The circuit is designed to simplify USB port power delivery based on self-powering 2 port USB...

Nixie tubes need about ~180Vdc to light up and thus on most devices, a DC-DC converter is needed. Here we designed a simple DC-DC switching regulator capable of powering most of Nixie tubes. The board accepts 12Vdc input and gives an output of 150-250Vdc. The board is heavily inspired...

The USBASP programmer is an important tool/accessory for embedded systems engineers/ firmware developers. It is a USB ICSP (In-Circuit Serial Programmer) that allows developers to easily upload firmware/bootloaders on AVR microcontrollers. Unlike what you find to serial programmers like...

The ATtiny10 is a high-performance, low-power Microchip 8-bit AVR RISC-based microcontroller which combines 1KB ISP flash memory, 32B SRAM, 4x general-purpose I/O lines, 16 general purpose working registers, a 16-bit timer/counter with two PWM channels, internal and external...