Raspberry Pi 4 released just a few months back from today. Raspberry Pi 3B+ has not become obsolete. It will be supported for the projects which work well with it. Unless you need the extra RAM for a project, getting a new board will invite to buy or 3D print an enclosure. The port layout of Raspberry Pi 3B+ is different than Pi 4. The more bad news is that - Pi4 gets hotter. Does it play 4K … [Read more...]
Control Multiple AC Appliances With One ESP32 Arduino
The result of this guide will be a local control panel with ESP32, pushbuttons, LED indicators, relays which can control the connected AC appliances by the simple pushbutton press. When connected to Wi-Fi, it will be able to control the thing over the internet with simple HTTP cURL commands. This guide and code can be used for home automation or creating smart power outlet. Single relay version of … [Read more...]
Influence of the Internet of Things (IoT) on Retail : Part III
This is the third article of this series. In the second part of the article on Influence of the Internet of Things on Retail, we have discussed some of use-cases. In this part, we will discuss the rest of the use-cases i.e. Logistics and Online trading. In addition to the actual sale, the processes in the supply chain offer a high potential for optimization. In particular, in the areas of … [Read more...]
Influence of the Internet of Things (IoT) on Retail : Part I
The Internet of Things (IoT) is evolutionary rather than revolutionary development that will continue to evolve rapidly over the next few years. Apart from the present series, we have Internet of Things in the Smart Home and Wearables and Internet of Things for the readers. The beginning of this evolution by Internet of Things (IoT) dates back to the sixties. At the beginning of the nineties, … [Read more...]
DIY Solder Masking for PCB Making at Home
Solder Mask Protects the Copper Tracing of the PCBs & Gives a Professional Look. Here is About the Solder Masking for DIY PCB Making at Home. Though previous various publications we talked about making PCB at home. These days, there are also flexible PCB mainly for creating connector ribbons with some components. Any kind of PCB better gets a mask. Solder mask is a thin lacquer-like liquid … [Read more...]
Simple Level Shifter With Transistors (3.3V-5V)
Earlier, we talked about the level shifter. Raspberry Pi, ESP32 etc things operate at 3.3v logic whereas, relay modules usually need near 5v TTL logic level. In our guide to control AC appliances over the internet with ESP32, you will notice that directly connecting the relay with ESP32 will not properly work - it will work over the internet but when you'll press the pushbutton, it will go to off … [Read more...]
Arduino High Resolution Music & Alexa Intergration With Sony Spresense
We are not scrapping ESP32 SoC. It is alone good for projects such as Glass Touch Switch With LED. When we need high end multimedia such as good camera, high resolution music then we need something like Sony Spresense. Sony Spresense is best for trying day to day high-quality DIY gizmos. The higher initial cost of Sony Spresense does give a good return. Now, the Sony Spresense device itself does … [Read more...]
EL Wire (Electroluminescent Wire) Basics For DIY Works
EL wire is wire which glows without LED. We can control EL Wire through an Arduino or ESP32. These are thin copper wire coated in a phosphor which produces light when AC is applied to it. AC does not mean home supply AC - battery with inverter enough for them. They can be used in a wide variety of projects much as custom neon lights were often used. The thin diameter EL wires make them flexible … [Read more...]
Traffic-Sign Recognition : Basics
Traffic-Sign Recognition (TSR) is a part of Advanced Driver-Assistance Systems (ADAS). Traffic-Sign Recognition (TSR) helps the vehicles to recognize the traffic signs on the road. The signs can be speed limit, school children, turn ahead, speed breaker and so on. The Traffic-Sign Recognition systems are increasingly being used for road traffic safety by helping the drivers by automatic alerts on … [Read more...]
2-in-1 convertible laptops vs Android Tablets
2-in-1 laptops have a screen which flips back 360 degrees. The screen can be detachable, which makes hybrid of tablet and desktop and the rest 2-in-1 laptops have a screen that flips off, providing a tablet experience and commonly named as “convertible”. Unless desktop computers are in consideration, 2-in-1 convertible laptops with 14 inch and 15-inch screens are of definite attraction. There are … [Read more...]
ESP32 Relay Control : Shift 3.3V Signal to 5V Signal
In our guide on Controlling AC Powered Appliances With ESP32 and IBM Watson IoT we pointed that the relay connected with ESP32 may not properly function. There are many ways to shift the 3.3V signal to 5V signal. A level shifter or logic-level shifter is a circuit used to translate signals from one logic level or voltage to another. The logic-level shifter can be uni-directional, … [Read more...]
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