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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...]

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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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Alexa with ESP32 Arduino and Watson IoT Platform : Fundamentals

In our one earlier discussion, we delivered the concept of how we can Build ESP32 Arduino Glass Touch Switch With LED. Higher models of the glass touch switchboards also have Alexa voice control support. In this fundamental discussion, we will talk on how to combine Alexa with ESP32 Arduino and Watson IoT platform. We can use Amazon Echo Dot or just Android Smartphone with Alexa app as a verbal … [Read more...]

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How to Build ESP32 Arduino Glass Touch Switch With LED

These days, glass touch panels are becoming common even for the household switchboards. China worldwide selling units which have touch switch, a remote control, sometimes Wi-Fi with a mobile application for IoT control. Here is how to build ESP32 Arduino glass touch switch with LED. Glass touch panels are electric shockproof and cost of manufacturing total units including relay, SoC (like ESP32) … [Read more...]

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Tips For Building Digital Switch With ESP32 Arduino

There are some design considerations to increase safety while building an ESP32 Arduino based physical switch controlled by IoT project. In our earlier guide (Controlling AC Powered Appliances With ESP32 and IBM Watson IoT), we have shown the basic of how to use a pushbutton and IoT control together. The case will be using both the pushbutton and IoT control independent. Our that guide is a … [Read more...]

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Required Circuit For Bare Minimum ESP32 Module

When you need many ESP32 for projects then you'll save money by avoiding full development board. Import tax is quite higher in many countries, yet the bare ESP32 module cost only $3. Bare minimum ESP32 module is more than System on Chip. ESP32 module, unfortunately, does not have built-in USB–TTL/ UART hardware. That costs $1.5 per piece and you do not need to connect USB–TTL/ UART hardware … [Read more...]

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Develop WEB Applications with ESP32 and IBM Watson IoT

Here is How to Develop Web Applications with ESP32 and IBM Watson IoT. Often, using an HTML page with JavaScript is practical than developing an Android App. Because, web applications can be hosted on own cloud server or cloud storage service - thus it becomes device independent. Securing access to such web application usually, need minimal configuration for the Apache2 server. Cloud storages … [Read more...]

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Cheap ESP32-CAM Setup With Arduino IDE

Here are Minor Details of Cheap ESP32-CAM Setup With Arduino IDE. In an earlier guide, we described the steps to setup the normal variants of ESP WROOM 32 with Arduino IDE on Windows PC. The software setup part is essentially the same for these cheap ESP32-CAMs too but there is more hardware to buy with it. This board has an OV2640 camera and a microSD card slot. Obviously, OV2640 camera … [Read more...]

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Controlling AC Powered Appliances With ESP32 and IBM Watson IoT

It is an upgrade to our previous article to control ESP32 Arduino LED from IBM Watson IoT. We already talked about Android Apps for Watson IoT for this purpose. We already have an article to use relay with Arduino. Our linked relay guide should be enough for anyone to understand how to use relay and AC connections. These relay modules will create mechanical clicking sound like switch. My relay … [Read more...]

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Android Apps to Control Devices Connected to IBM Watson IoT

It is too common to find some ready to use Android app which can perform basic works, such as some apps which can work to control ESP32 Arduino LED from IBM Watson IoT. As for receiving notification from IBM Watson IoT platform, we previously described one app named Pushover for push notification after routing the backend on Node-RED. However, for our previous guide to control ESP32 Arduino … [Read more...]

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Control ESP32 Arduino LED from IBM Watson IoT

Anthony Elder published a guide on developerWorks Recipes on how to "Build your own Watson controlled kettle" for ESP8266. This article's code is shamelessly ripped-off from him for broader usage. This guide will show how to turn on and turn off a LED connected with ESP32 Arduino from IBM Watson IoT platform. That "remote control" over the internet will be shown by using a simple bash scripts - … [Read more...]