DIY Arduino Battery Spot Welder

Due to many requests for the PCBs I do currently have some PCB Sets and prebuilt kits in stock. Take a look here: https://malectrics.eu An Arduino Nano based Spot Welder for battery welding This Spot Welder can be used to weld 18650 batteries. It uses a 12V car battery as welding current supply. Typically one 40Ah 440A battery delivers enough current to get good welds with 0.15mm nickel strips and even 0.25 ...

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Quick Arduino Hygrometer with OLED display

We have been having some condensation and mould issues in our apartment recently due to, I think, the humidity levels. Our property is relatively newly built and, as such, has very good insulation properties (double glazed windows etc.). The side effect of this is that there is very little ventilation and therefore humidity rises over a period of time and water then condensates on windows causing puddles on ...

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OpenSource Arduino OLED Clock with temperature measurement

Today I am going to show you how to make An OpenSource Arduino UNO OLED Clock That Also Measures Temperature. This project is an OpenSource and it's open to everyone. It doesn't require any special engineer skills, and will take you less than couple of hours once you have all the parts you need. This clock will not only show you exact time and date but also it will show you the ambient temperature in both F ...

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Wi-Fi and OLED Upgrade for MightyOhm Geiger Counter

In this post I will show you how to add Wi-Fi connectivity and an OLED screen to the MightyOhm Geiger Counter kit. Lots of fun! Introduction I assembled my Geiger counter kit from MightyOhm some time ago. It's a very fun kit and the finished counter looks awesome. Oh, that Geiger-Muller tube sitting on that yellow PCB! I've always wanted to modify it somehow and add functionality. Today I realized that an A ...

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ESP8266 Weather Widget

Welcome to my new Weather Widget Project. A weather widget is a application that can be downloaded on your PC, laptop or a mobile device and perform the job of providing easy access to weather information.But I was always trying to make something different.So I go through the internet to get some ideas.After few days of my work, finally I made it.I am sharing this so that any one can make it easily. This is ...

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Arduino : Lead Acid Battery Capacity Tester (Updated)

Story Yosh ! At last, finished working on this project. I have been working on this project for a while, then got bored and left the remaining work ( mostly firmware ) for a couple of months, ah ! the longest project I ever did ! What's all this about ? This project is about discharging lead acid battery at a constant current to measure its actual capacity. Due to hardware and design constrain there are few ...

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Building a SmartWatch

I have an issue with smart-watches. Watches in general fall into one of two categories: a tool to tell the time, or a fashion statement. Increasingly, I believe the latter category is larger than the first. With the advent of the iWatch, Pebble and the like, fashion and making a statement has moved into technology. It's not quite a new thing but nevertheless, it's something I'm not too fond of. My solution? ...

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OLED on the Cheap!

I like cheap electronics for playing. Cheap is good for budget conscious hobbyists and China is delivering lots of toys for playing - one being the inexpensive "mono" OLED displays.  The single-color displays often come in a dual-color implementation where the top row of pixels are one color and the remaining majority of the lower pixels are another color.  These dual-color units allow the title information ...

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Tiny Message Board

We will make a tiny connected message board with a 0.96" OLED display that can be controlled from your phone. We will use the IFTTT "DO" app to set and clear the reminder so that no extra hardware will be required besides the OLED display. In addition to the reminder, our tiny message board can display 3 other lines, which we will use to display the daily weather temperature forecast and a surf report, whic ...

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OLED displays for still better prices!

The most advanced display technology – OLED, goes ahead into many industrial products thanks to its advantages. From a certain point of view exactly the industrial environment properly checks features of displays and especially in critical applications extreme thermal resistance a big advantage (immediate response even in frost). As it uses to be, new technologies are rarely cheap. In case of OLED we can sa ...

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Double RC servo tester with OLED display

This is something I’ve already worked on but was never really happy with the result, mainly because the potentiometre that I used was of poor quality and hence non linear and “jumpy”… The problem is simple: I need to have a reliable and easy to use servo tester, that I can use to test/play with a standard RC servo or ESC or anything else that uses the same control protocol. This necessity has arisen again q ...

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