ATtiny45 motion sensing night light

DanR has shared this motion sensing night light board:


ATtiny45 motion sensing night light V1.2 D

This light is powered by an ATtiny45/85 which powers on the 14 LED lights when motion is sensed and it is in a dark room. The light sensor on the board will not allow the lights to come on if it is in a reasonably lit room.

It is fitted with a barrel plug for power, this model specifically with an L7805CV voltage regulator.

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ATtiny45 motion sensing night light

DICE10: electronic dice controlled by two GPIO

Yay, another mini-project with the ATtiny10! A while ago I devised a scheme to drive an electronic dice with only two IO lines. I finally found the time and motivation to build up a small design using this as an entry for the hackaday 1k compo

via DICE10 – electronic dice controlled by two GPIO. — Tim’s Blog

DICE10: electronic dice controlled by two GPIO


designed this simple board with two ATTiny processors powered by a micro USB connector.


Micro USB power input to two ATTiny MCU’s. There are two different ATTinys on this board. An ATTiny84 and an ATTiny85. These MCUs are great because they can be used with no additional components.  In fact, on this board, the only additional components are some filter capacitors for the power rail and a header for the programmer interface.

I have exposed an array of copper pads for every pin. This makes it easy to add LEDs or to wire to just about any sensor.

jonmash has shared the board on OSH Park:


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BFuse: Electronic Fuse for Breadboard


created this solution to make breadboard prototyping safer for components:

BFuse – Electronic Fuse for Breadboard

adjustable and programmable electronic fuse especially designed for breadboards – a breadboard fuse, or BFuse


The trip current can be set from 50 mA to 1 A but it can measure current up to 6 A [..] It has reverse polarity protection (by P-FET), transient voltage suppressors both on its input and output and two LEDs for indication


Set current and actual current can be compared using ATTiny’s built-in comparator or sampled by the ATTiny’s ADC. Then, the microprocessor controls a P-FET switch that opens or closes the power supply
BFuse: Electronic Fuse for Breadboard

Low power Arduino Pro Mini board

3317771479151537261.JPGMax.K created this Arduino Pro Mini compatible development board for low power applications:

LP Mini

ideal for data logging over extended periods of time [..] can run for months or even years on a coin cell



  • Microcontroller: Atmega328p with Arduino bootloader
  • Real Time Clock: MCP79410
  • Voltage Regulator: MCP1700


  • 2.8 µA current consumption in sleep mode
  • Compatible to the Arduino Pro Mini (except for pin 2 and 10)
  • A real time clock keeps the time and is used to wake the Atmega from sleep mode
  • Sleep current is reduced by using a more efficient voltage regulator
  • A simple Mosfet is used to turn external devices on and off if the IO pins cannot provide enough current
Low power Arduino Pro Mini board

Building an ATmega328 uploader

Carlos of GlowSaber wrote a great blog post on how we built an AVR programmer shield:

Building an ATmega328 uploader

As I learned more about Arduino, I realized that it is possible to redesign the GlowSaber around the ATmega328 chip [..] I designed an Arduino Shield that can be used to burn the bootloader and upload programs to an ATmega328 chip.

Here’s a example of an ATmega328 in a custom board:

cvadillo shared the board on OSH Park:

Arduino ISP Breakout shared project

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Building an ATmega328 uploader