tinyOSD & tinyFINITY – a tiny opensource video tx with full graphic OSD

tinyOSD and the tinyFINITY,  a tiny open source video transmitter with integrated graphic OSD from fishpepper.de As I like fully integrated solutions I started to work on a new PCB design that includes a RTC6705 video transmitter and my tinyOSD into one tiny 16x16mm board called tinyFINITY. The image shows a preliminary version where I tested […]

Open Trickler: The DIY smart powder trickler

Eric Higgins has a nice build log on his Open Trickler project a bluetooth-enabled smart powder trickler from off-the-shelf parts for under $60: Fundamentally, this is not a hard problem to solve. Read the value from the scale, run a motor that moves powder into the scale, turn off the motor when the scale reads […]

Wifi based DIY 5V switcher for led-lights

Albert posted a detailed how-to on building DIY ESP-12F based USB-5V switcher: 5V powered 100LED circuit was consuming around ~1.8Watts(though 5.1Ohm series resistor was really hot) and the brightness of the LED’s were not bad, especially difference between first led and last led brightness didnt bother me it was hardly noticeable when seen from distance. So […]

Outdoor UV index sensor

A detailed instructions of how to build this outdoor UV index and ambient light sensor from Mare & Gal Electronics: The VEML6075 senses UVA and UVB light and incorporates photodiode, amplifiers, and analog / digital circuits into a single chip using a CMOS process. When the UV sensor is applied, it is able to detect UVA and UVB intensity […]

Rombus pinball – a LattePanda mini pinball machine

Matt Brailsford (aka Circuitbeard) has a nice write-up about building his mini pinball machine with a lattepanda core running dual monitors: I generally start my projects by thinking about the hardware that I’m going to want to use as I’ll need to know sizes when it comes to the design phase. My first thought was to […]

Custom 3D printed magnetic encoder disks for robotics projects

A how-to on making a custom DIY magnetic disk encoder by Erich Styger: I’m making great progress with the firmware for the new Mini Sumo Robot (see “New Concept for 2018 Mini Sumo Roboter“). The goal is a versatile and low-cost Mini Sumo robot, and the robot comes with the feature of magnetic position encoders. […]

Arduino controlled Dual Mono AK4490 DAC (part 2)

An update on Arduino controlled Dual Mono AK4490 DAC project we covered previously: After I was certain that everything related to the software was working the way it should, I designed a “motherboard” that would take care of the following: Accept the STM32F106 board Accept the 3.5″ TFT Accommodate an 24LC256 EEPROM chip, used to […]

Microcontroller action potential generator

Scott Harden writes: Here I demonstrate how to use a single microcontroller pin to generate action-potential-like waveforms. The output is similar my fully analog action potential generator circuit, but the waveform here is created in an entirely different way. A microcontroller is at the core of this project and determines when to fire action potentials. […]

DIY NAS

A DIY NAS project from Peter Scargill: So I’ve had a fair experience of these systems. Well, this blog entry isn’t about expensive NAS systems. It’s about a cheap one… really cheap that is – and DIY. How cheap? Well, about £12 depending on what you have handy. For this price you need a handy 2.5” […]

Creating custom 3D printed LED bar graphs

Glen Akins has a nice build log on his 3D printed LED bar graphs: While building my zombie containment unit, I decided I wanted some LED displays or bar graphs to complement the containment status video running on the smaller secondary video monitor. Some other containment units used LED air pressure gauges from eBay. I […]

Build an open source laser reflection barrier

Boris Landoni from Open Electronics writes about an open source project laser reflection barrier: It allows us to detect the presence and passage of an object thanks to the combination of a laser diode which emits a light ray and a phototransistor which detects reflected light. Robotics applications and industrial control systems normally make use of optical […]