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Prototyping board with built-in power supply

Posted on January 22, 2016 by R-B One comment

This prototyping board with built-in regulated power supplies was designed by Electro-Lab and consists of four independent DC-DC buck converters based on LM2675-ADJ and generates 3.3V, 5V, 12V and -12V at 1A. Prototyping is a useful and powerful method in electronics which lets us analyze a circuit before using it in a system or turning it into a product. In this process we may need a single supply or multiple supplies to power the circuit depending on the type of the application. For example, an op-amp circuit may need a symmetrical supply such as +12V and -12V or a logic circuit

ESP8266 energy monitor

Posted on January 20, 2016 by R-B One comment

Brian Dorey designed a standalone home energy monitor using the ESP8266 and a bunch of sensors that to monitor the mains current, the consumption of electric energy, as well as the gas usage. His ESP8266 energy monitor measures the mains current using the iSnail current sensor, which is a self powered AC current transducer that provides a 0-5V dc analog signal proportional to the AC current flowing through it. The output from the current sensor is digitized using the ADS1115 16-bit ADC from Texas Instruments and is fed to the ESP8266 through I2C bus. His electric meter has a blinking LED on the front panel that blinks once for every

ESP8266 timer switch

Posted on January 20, 2016 by R-B One comment

Here are the instructions for building an ESP8266 timer switch for controlling an AC load connected to a wall socket. It uses an ESP-01 module which is programmed to act as a digital ON/Off timer and controls an external relay circuit. The relay circuit must be isolated from the ESP-01 module using an opto-coupler circuit to prevent any electromagnetic interference from the relay coil which may cause reseting of the ESP8266 device.

PCF8563 based alarm clock

Posted on January 17, 2016 by R-B 2 comments

This project is about a PCF8563 based alarm clock built by Shawon Shahryiar from MicroArena. The PCF8563 is a CMOS Real-Time Clock (RTC) and calendar optimized for low power consumption. It features a programmable clock output, interrupt output, and a standard I2C bus to communicate with a host MCU. The project uses the PIC16F877A microcontroller for reading time and date from the RTC chip and a standard HD44780 character LCD for displaying it. The date, time, and alarm settings are performed through a keypad matrix, and a piezo buzzer is used to create the alarm sound. Following video shows the alarm

Advanced Arduino data logger

Posted on January 17, 2016 by R-B Leave a comment

educ8s.tv has posted a video tutorial on building an advanced Arduino data logger that records temperature, humidity, barometric pressure, and ambient light intensity on a micro SD storage card. It uses some easily available sensors, like DHT22, BMP180, and BH1750, for sensing the surrounding environment and the DS3231 RTC module for time-stamping the measurements. The tutorial describes in steps how to setup the complete project on a breadboard. The data logger runs for about 2 weeks using simple AA batteries and the data are stored on the SD card in a .csv file for easy transport to PC for further processing.

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