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Contact Bounce of Pushbuttons and Arduino ESP32 Debounce

No surface is perfectly smooth and inelastic. When two surfaces of pushbutton comes together with any force, there is kinetic energy that makes ringing. In one older article we talked about different types of switches. That basic idea and terminogies required to be known for this article on the phenomenon contact bounce of pushbuttons and counteracting with software library. Contact bounce is a … [Read more...]

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Writing to CouchDB/Cloudant From ESP32 Arduino

You'll not get full working code in this guide but get full hints of code, resources. This guide will help to learn our regular readers in opposite direction of learning. Methodology is exactly like we did with Watson IoT platform (our GitHub repo has four sample codes). Here Are Some Tips, Resources For Writing to CouchDB/Cloudant From ESP32 Arduino. Our regular readers can recall about HTTP Post … [Read more...]

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ESP32 Arduino Built-in Hall Sensor Code & Theory

ESP32 has a Hall Effect Sensor near pin 22, just below and middle of the inscription "ESP32-WROOM-32", inside the metal cover. Hall effect sensors measure the magnitude of a magnetic field as output voltage. Hall effect sensors are used for proximity sensing, positioning, speed detection, and current sensing applications. Hall sensor when combined with threshold detectors act as a switch. That is … [Read more...]

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How to Invert Signal for Arduino (HIGH to LOW or the Reverse)

Such need is common when then need interfacing for IoT with household gadgets. Here is How to Invert Signal for Arduino (HIGH to LOW or the Reverse). One way is using some kind of relay module, which we described in our guide to interface with doorbell. This is normally a problem with devices that are active LOW. Since most devices are active HIGH, meaning they are triggered by a HIGH voltage, … [Read more...]

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How to Interface/Connect Doorbell Switch with Arduino ESP32 Pushbutton

We have different types of doorbell projects such as Arduino doorbell with 3 LEDs, ESP32 Arduino which sends push notification on button press. We Need to Connect Our Electric or Battery Operated Doorbell With the Project to Make it Functional. Here is How to Interface/Connect Doorbell Switch with Arduino ESP32 Pushbutton. Commonly projects all over the internet ends describing from sending … [Read more...]

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Connecting ESP32 Arduino with DHT11 with IBM Watson IoT

Earlier, we described how to create graph on IBM Watson IoT dashboard by using the default widgets. In previous guide, we described how to use ESP32 Arduino with DHT11 sensor. Here is the Code and Diagram to Connect ESP32 Arduino with DHT11 with IBM Watson IoT and Get Odometer Like Gauges on Dashboard. For this guide, you will need : Reading the above linked guides for setup and materials … [Read more...]

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ESP32 Arduino with DHT11 Sensor : Connection & Code

Here is Connection & Working Code for ESP32 Arduino with DHT11 Sensor. We will use Adafruit's libraries for DHT11 and DH22 Temperature Humidity Modules. For using DHT11, DHT21, DHT22 with non-ESP32 Arduino please read our previous guide on Arduino Temperature Humidity Sensor. For ESP32, it is mandatory to have the common required setup for Arduino IDE (ESP32 does not work with Arduino IDE out of … [Read more...]

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Which One is Preferred to Make a Smart Doorbell – Raspberry Pi or ESP32 Arduino?

Ideal answer is none. If our previous publication on Watson Visual Recognition with cURL beside guides like sending Push Notification via Watson IoT giving hope of ultra-modern DIY project, then such hope must be killed. We will not supply ideas, projects which will fail with time. Smart Doorbell if used for security purpose demands a commercial solution. DIY solutions mostly for fun at … [Read more...]

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ESP32 Arduino : IBM Watson Visual Recognition of Images with cURL

IBM Watson Visual Recognition of Images Supports cURL. ESP32 Arduino Can Send cURL of Images and Receive JSON Response on Serial Monitor. Demo of Watson Visial Recognition can be found on this URL : [crayon-641bcde732256319773050/] WARNING : This testing project's Arduino/ESP32 code may return blank response at present. It is for pointing to understand how the platform can be used from … [Read more...]

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IoT Prototyping : Pushover Ready to Use Android App for Push Notification

A button press sending a push message and email from ESP32 to Android is most wanted project. It is limited by people's abillity to develop Android app. I was finding an easy way for the readers. I re-discovered and tested Pushover with Node-RED on IBM Watson IoT platform. Within 15 minutues with minimum clicks I received beutiful push message from IBM Watson IoT platform with ESP32 HTTP POST on … [Read more...]

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Base64 Encoding on ESP32 Arduino (Base64 for Images)

Base64 images are easy to transmit over the network. Base64 encoding of images for CSS is highly discussed on our blog. Base64 is not new to our regular readers but the current application is different. Here is How to Use Base64 Encoding on ESP32 Arduino. ESP32 lacks sufficient RAM which limits the actual capabillity. You can actually use HTTP POST (like we have shown with IBM Watson IoT … [Read more...]