Usually, by the word "flip-flop", we understand one on and another off. That is the usual reason behind searching our guide on Arduino Flip-Flop Blinking LED With Push Button. While that is true (to some extent) as a visual effect, for the advanced flip-flop, we need to know some theory. When we are programming 2-3 LEDs, the logic remains easy, hence we could avoid the theoretical … [Read more...]
ESP32 ESP Rainmaker Cloud for Arduino
Espressif is a company that has revolutionized the low-cost WiFi, BLE development. With classic ESP32 WROOM module, we have shown Controlling AC Powered Appliances With ESP32 and IBM Watson IoT with zero monthly cost. But the coding part with IBM Watson IoT was not easy. Although, we have pointed out how to use Android Apps to Control Devices Connected to IBM Watson IoT, essentially it was not … [Read more...]
How to Replace delay() with millis() : Arduino Programming
In many of the sketches shared by us have the millis() instead of delay(). Not always it is possible to explain a function within a guide on how to do a thing. In this article, we will explain about millis() and provide some easy examples so that you can reproduce yourself. It is normal that the Arduino users initially use the delay() function. The main reason is the blink example is the thing … [Read more...]
Arduino LED Candle : Some Codes to Help You
Thanks to China for making various designs of LED candles available all over the world. Indeed, most of these LED candles are not closest to the real candle, but they do give us the idea to think around playing around creating our microcontroller controlled LED candle. I was looking for a realistic feel and soon discovered that two people in project sites already worked a lot behind the creation … [Read more...]
ESP32 and Coin Vibrator Motor
Coin vibration motors or small vibration motors can be used for different purposes, such as an alert instead of a beep. A Vibration Motor Module is sold which includes the required resistors and transistors. They cost around $3-$4 per piece. 10mm and 12mm coin vibration motors are also sold as a component. If you are using the module, you can connect : ----------------------- ESP32 | Vibration … [Read more...]
Raspberry Pi Pico vs ESP32
You can get the Raspberry Pi Pico on Amazon for just under $4 plus shipping costs. The much older ESP32 you get in various forms for just under $10. You see, you get the ESP32 for a little more money with additional sensors or a display to display sensor data (or even the IP address of the microcontroller) or a camera. On the Raspberry Pi Pico, there are quite new chip RP2040 installed which was … [Read more...]
How to Make ESP32-CAM IP Camera Access from Anywhere in the World
First and foremost thing to warn - you can not compare the pro-grade IP cameras, something like EZVIZ IP camera with ESP32-CAM IP camera. ESP32-CAM IP camera module is dirt cheap and it is great to increase the number of video capturing devices. I would suggest you have some pro-grade camera to cover the main unsecured points of house/office and use ESP32-CAM IP camera module as an "add-on" to … [Read more...]
How to Test USB to TTL Converter
A USB-to-TTL adapter (USB-to-UART adapter, USB-to-UART bridge) is a USB device that lets us connect a device with TTL/UART port to our PC through the regular USB port. We can use it to update firmware on routers, modems, mobile phones, hard disks, and so on. For testing AT Commands, we need a USB-TTL module built on CP2102 IC. For the sake of proper description, we will describe how to wire The … [Read more...]
How to Use PWM in ESP32
Pulse Width Modulation (PWM) is a widely used technique for power delivery. ESP32 has dedicated hardware for PWM. Pulse-width modulation (PWM) of a signal or power source is a technique in which the duty cycle of a periodic signal (a sinusoidal or a square signal, for example) is modified. The duty cycle of a periodic signal is the relative width of its positive part relative to the period. … [Read more...]
ESP32 IoT Setup For Concealed Conduit Wiring
In this article, we will discuss the electrical wiring required to set up a DIY IoT smart control system to control 8 3W spotlights, one ceiling fan and one Indian jhar bati (chandelier lamp). We have a total 8 number of connections where 8 out of 8 are dimmable and we are using the traditional piano/rocker switches. We have discussed about interfacing the piano/rocker switches with ESP32. We … [Read more...]
What is the Maximum Cable Length Between Arduino/ESP32 and a Sensor
After reading our guide on How to Interface a Piano/Rocker Switch (SPST) With ESP32 Arduino, one reader has asked whether it is possible to keep all his ESP32 with relays and indicators at one room and connect the switches, sensors of the whole house via cables. That is possible to deploy but various hardware components will be required. Also, coding may need some change. I believe that so huge … [Read more...]
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