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The objective of this post is to explain how to control a motor, including its speed, using an ESP8266 and an ULN2803A integrated circuit. Hardware Since the digital pins of a microcontroller can only source a limited amount of current (in the case of the ESP8266, 12 mA maximum [1]), we can't directly use them …
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The objective of this post is to illustrate how to chain two SN74HC595 ICs and controlling them, using SPI, with the ESP8266. Introduction The objective of this post is to illustrate how to chain two SN74HC595 ICs and controlling them, using SPI, with the ESP8266. Naturally, the working principle is the same for using the shiftOut …
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The objective of this post is to explain how to transfer data between the ESP8266 and the SN74HC595 using the SPI interface. Introduction The objective of this post is to explain how to transfer data between the ESP8266 and the SN74HC595 using the SPI interface. An explanation on how to control some LEDs using this …
The objective of this post is to explain how to connect the SN74HC595 8-bit shift register to an ESP8266 to control some LEDs. Introduction The objective of this post is to explain how to connect the SN74HC595 8-bit shift register to an ESP8266 to control some LEDs. The code to interface with the device is …
The objective of this post is to explain how to parse simple JSON Arrays on the ESP8266, using the ArduinoJson library. Introduction In this post, we will create a simple program to parse a JSON string that includes an array of integers. We assume that the ESP8266 libraries for the Arduino IDE were previously installed. …
The objective of this post is to explain how get the internal temperature measurements of the DS3231 using an ESP8266 and an easy to use Arduino library. Introduction As stated in a previous post, the DS3231 uses temperature compensation to calibrate the adjustable capacitors of its resonance circuit, in order to maintain time and date with …
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This post describes one of the basic laws of circuit analysis, more precisely KVL (Kirchhoff's Voltage Law), which states that the sum of all voltages in a closed loop of a circuit are equal to zero. KVL Kirchhoff's Voltage Law states that the sum of all voltages in a closed loop of a circuit (taking into account …
This post explains how to upload code to ESP8266 using the Arduino IDE and a Serial-USB converter. We assume the use of an ESP-01 board, one of the cheapest and most used boards based on the device. Hardware configuration This tutorial assumes the use of the ESP-01 board, shown in figure 1, as the hardware. …
This post briefly explains what is the ESP8266, a very cheap SoC currently used in many IoT applications. What is the ESP8266? The ESP8266 is a SoC that integrates the TCP/IP stack and is able to connect to a Wifi network, allowing it to communicate with other devices over the Internet. This device is made by …
Following the previous post describing the HC-06 module, this one shows how to use it to build a simple program to toggle the debugging LED of an Arduino board, using Bluetooth. This tutorial assumes the use of the HC-06 integrated in the baseboard described in the previous post. Connecting HC-06 to the Arduino Board Using the previously …
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