Recently I needed to actually “see” a current waveform in the 100 uA to 5 mA range with at least a couple MHz bandwidth. This extremely expensive probe would have been perfect, but instead I built something similar for about $30 using the amazing Analog Devices AD8428 amplifier. Click “Read more” for details and a […]
Measuring microamps & milliamps at 3 MHz bandwidth Read More »
Introduction Infrared (IR) can be used for line-of-sight communications over low to moderate range. IR is nice because of the lack of interference (except for sun and compact fluroscent lights) and freedom from FCC regulation. The web site http://tthheessiiss.wordpress.com/2009/08/05/dirt-cheap-wireless/ (Jacob Sikker Remin, 2009) shows how to use a IR remote control receiver and IR LED
Infrared Communications for Atmel Mega644-1284 microcontrollers Read More »
A high-side current monitor turns a shunt drop into a scaled voltage for an ATmega328P ADC channel. The design arithmetic, the 2500 ohm gain resistor and the supply and reference limits that bound the reading.
High-Side Current Sensing With the ZXCT1010 and an ATmega328P ADC Read More »
A light meter is a device that measures the intensity of light. It finds applications in schools, hospitals, production areas, passageways and more to measure and maintain proper lighting levels. It is often used by photographers to determine the proper exposure for a photograph. Today we are going to build a simple light meter using
Building a simple digital light meter using Arduino and BH1750FVI sensor Read More »
What is on the battery connector A modern laptop pack is not a battery with two wires. It is a battery, a protection circuit and a small computer — the battery management controller — that tracks charge, temperature, cycle count and health. The controller talks over SMBus, a two-wire bus derived from I²C, using the
Testing laptop battery: pinout, SMBus, charge capacity Read More »
A couple of weeks ago, I just post a review of my MCP23017 breakout board. As the board configuration allows to connect up to 8 of these boards, I decided to do it and see that it really works. My goal is interface 8 LCD displays with two wires: SDA and SCL from an I2C bus.
How to interface 8 LCD displays and 24 leds with only two wires Read More »
I develop this MCP23017 Brekout Board to interface a 2×16 LCD display with any microcontroller using a standard I2C bus. Typical 2×16 displays needs at least 6 lines to work (when working in 4-byte mode); in some cases, this will be prohibited for some microcontrollers. With this board, you can control it with only two lines
Designing Electronics in Spain Read More »
−Inhaltsverzeichnis Thermometer width DS18S20 Hardware Software final Download Thermometer width DS18S20 In my new Dacia Duster is missing unfortunately an outside temperature indication. A finished thermometer with LCD did not separate from there while the contrast with sunlight usually particularly is. I had still alphanummeric LED display in red there for this project in the
ATTINY2313 Thermometer width DS18S20 Read More »
What a USBtiny programmer actually is USBtiny is a software USB stack written by Dick Streefland for AVR microcontrollers with no USB peripheral, and USBtinyISP is the board built around it: an ATtiny2313 on a 12 MHz crystal, an ISP header, and on most versions a 74AHC125 buffer. No bridge chip, no USB-capable MCU —
USBTiny-MkII SLIM programmer Read More »
A version-bound technical look at Vassilis Serasidis’s ATtiny13 125 kHz RFID reader: how the coil is driven, which demodulator path the owner reports, and how the 64-bit frame and software serial timing fit together.
125 kHz RFID Reader Based on ATtiny13: Version-Bound Design Notes Read More »
