Compensation of Oscilloscope Probes


by Maurizio @

Using simple wires to measure signals with the oscilloscope would result in unreadable plots on the scope, the main reason being the noise coupled onto the “probe” itself. The first line of defense against that would be to use a coaxial cable as a probe, which would prevent external noise coupling.

An unwanted deterioration of the measured signal is due to the capacitive loading that such a piece of cable adds to the signal. An equivalent schematic of an IC to IC signal is illustrated in figure 1.

Compensation of Oscilloscope Probes – [Link]

9-axis motion sensor and MCU reside in tiny package


by Susan Nordyk:

Housed in a 5.2×3.8×1.1-mm package, Bosch Sensortec’s BMF055 9-aix sensor combines an accelerometer, gyroscope, and magnetometer with a 32-bit MCU to enable easy programming and customization. It can be used by designers creating advanced application-specific sensor fusion algorithms for robotics, gaming, remote controls, navigation systems, drones, and human interface devices for IoT projects.

The BMF055 system-in-package integrates a triaxial 14-bit accelerometer, a triaxial 16-bit gyroscope with a range of ±2000 degrees per second, and a triaxial geomagnetic sensor. Based on a 32-bit ARM Cortex M0+ core running at up to 48 MHz, the Atmel SAM D20 microcontroller employed by the BMF055 provides in-system programmable flash memory and a rich set of peripherals and interfaces.

9-axis motion sensor and MCU reside in tiny package – [Link]

Top-level Weller soldering stations for even better prices


Now even you can afford the best, what´s available on the field of soldering and service.

A fact, that we also try to transform better purchasing conditions on You – our customers, we´ve already mentioned to you few times in our articles. This time we have this pleasant occasion to make so at soldering equipment from company Weller. The biggest change happened at components, which are usually the most costly – at soldering (and desoldering) stations.

The result is lower price at all Weller stations, which are our standard stock items – in majority of cases in 15-20%, what makes up to 200-300 Eur discount at the most expensive types.

It´s still actual, that within 1-2 weeks we´re able to supply you practically any Weller component (which we don´t keep in stock). In our offer can also be found selected types of original soldering tips and any other types can be supplied to you in a short leadtime and at convenient conditions.

So where to start? Probably best by having a look at the Weller catalogue. Our previous articles may also give you an inspiration.

Top-level Weller soldering stations for even better prices – [Link]

Unlock a Door with your Fingerprint


by Kinoma @

We built a biometric fingerprint-controlled lock prototype. A fingerprint scanner is used to capture and store the fingerprints of authorized users. When the scanner recognizes a user, a solenoid plunger disengages and opens the lock.

Unlock a Door with your Fingerprint – [Link]

How to program the ATtiny85 with the Arduino UNO board


by codebender_cc @

In this tutorial we will use an Arduino board as an ATtiny programmer.

To do this we will use one Arduino UNO board as an ISP (programmer) and one ATtiny85 micro-controller.

We will use Codebender – online Arduino IDE.

With the following procedure you will be able to program easily the ATtiny45 and ATtiny85 micro-controllers.

How to program the ATtiny85 with the Arduino UNO board – [Link]

Home automation with Telegram BOT



The project I’m going to describe today it’s a sort of proof of concept that will demonstrate the possibility to remote control sensors and actuators (for example a couple of relays) via Telegram.

Telegram is an instant messaging application, similar to the famous Whatsapp. Last June, the Telegram developers announced that a new set of APIs were available to develop bots.

Home automation with Telegram BOT – [Link]

Simple, Cheap Motor Controller


by TeamJaeger @

I’ve used this simple circuit several times to drive motors (like in my Stair Climbing robot) as well as solenoids. I originally picked it up from this instructable which is focused on controlling a solenoid. I wanted to isolate this circuit in its own Instructable as a motor driver so I could easily reference it from other future instructables and also provide example code to show how to use it in this manner.

Simple, Cheap Motor Controller – [Link]

Arduino Thermometer With DS18B20


by KonstantinDimitrov @

Hello, everyone !!! Today I’m going to show you how to make Arduino thermometer with DS18B20 digital temperature sensor, builded on breadboard and connected together with jumpers.

Info about the sensor – DS18B20 is 1-Wire digital temperature sensor from Maxim IC. Reports degrees C with 9 to 12-bit precision, -55C to 125C (+/-0.5C). Each sensor has a unique 64-Bit Serial number etched into it – allows for a huge number of sensors to be used on one data bus.

Arduino Thermometer With DS18B20 – [Link]

IP Time Clock using NTP protocol


by msuzuki777 @

So this Lazy Old Geek (LOG) has a couple of clocks in my bedroom. One of them loses time when the power is lost. The other is semi smart and automatically adjusts for Daylight Savings Time. Unfortunately, it does this using the old standard so I have to re-set the time four times a year. Well, I’m LAZY so I decided to make my own Clock. At first I was thinking Atomic clock as I have three in my living room (I’m a GEEK, remember?).

IP Time Clock using NTP protocol – [Link]