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]

USB PIC Programmer

DSCF2014-1024x768Stefano Purchiaroni rebuild a USB PIC Programmer that he found online. He writes:

This page is dedicated to everybody needs to program a PIC (Microchip) device via USB port. Looking on the web for ready-to-use projects, I found a good one called Open Programmer, coming with several schematics, PCBs and Open Source code. The original link is

What concerned me was the need to mount, on the mainboard, a specific socket board depending on the model of PIC being programmed. Moreover, the proposed layout did not meet my personal “compact look” ideas. So, I propose hereafter a small layout version of that circuit, adopting a single smart on-board ZIF socket. This version sacrifices many non-PIC microcontroller models. I will thank everybody proposing a larger range implementation, suitable to program Atmel and other devices. Anyway, if your goal is to program PIC devices, you are on the good site.

A small box, a USB connector, a ZIF socket, two leds. That’all in my compact proposal.

USB PIC Programmer -[Link]


Large Current Relay Driver


This is a large current Relay module with single pole double throw switch which provides normally closed and normally open operations. The Relay is the most common used module in application such as home automation, industrial automation, and machine on/off. Sometimes you need to control large current such as the fans, lights, water heaters, room heaters, Air-conditioning, vacuum pumps That is what this Large Current Relay Module can be helpful to drive such high current load with just TTL signal. Easy interface with embedded systems and micro-controllers.


  • Supply 12V DC
  • Current 190mA
  • Trigger Supply 3 to 8V DC
  • Optically isolated input for safety and noise immunity
  • 7 Pin Header for Inputs and 5V DC output
  • 3 Pin screw Terminals for Relay output

Large Current Relay Driver – [Link]

Passive Infrared Detector Circuit

The infrared (IR) is invisible radiant energy, electromagnetic radiation that we cannot see with our eyes, but we can sometimes feel on our skin as heat. The infrared light falls just outside the visible spectrum, beyond the edge of what we can see as red. Most of the thermal radiation emitted by objects near room temperature is infrared.

The circuit uses a MCP6032 microchip operational amplifier. The MCP6032 operational amplifier (op amp) has a gain bandwidth of 10kHz with a low typical operating current of 900nA and an offset voltage that is less than 150uV. The MCP6032 uses Microchip’s advanced CMOS technology, which provides low bias current, high-speed operation, high open-loop gain and rail-to-rail input and output swing. The MCP6032 operates with a single supply voltage that can be as low as 1.8V, while drawing less than 1uA of quiescent current. The MCP6032 is available in standard 8-lead SOIC and MSOP packages. It also includes, a PID20 integrated circuit and a few electronic components. The size of the output signal of PID20 is determined by the task at pins 3 and 4. The output signal at pin 3 is compared with a reference voltage equal to half the supply voltage. The reference voltage is taken from the voltage divider R2-R3-R4-R5. When approaching an object warmer than the surrounding environment, or to remove an object colder than the environment, the output voltage increases. The variation of the sensor output will be compared, the IC2a and IC2b, located voltage of 0.5V under and over voltage reference respectively. Depending on the output, one of the comparators calculates and activates T1.

This basic circuit is used in night-vision devices with infrared illumination, which allows people or animals to be observed without the observer being detected. The infrared light is also used in industrial, scientific, and medical applications as well as in consumer devices.

Passive Infrared Detector Circuit – [Link]