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30A, PCB-level supply monitor has integrated 300 µΩ sense resistor

Power Monitors As today’s electronic designs continue to grow in complexity, managing power consumption and optimizing overall efficiency become even more important. Accurate power supply voltage and current monitoring is crucial to conserving power and guaranteeing reliability in everything from industrial and telecom applications, to automotive and consumer electronics. Measuring power consumption, as wel ...

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Veronica – VRAM

I considered subtitling this article, “adventures in breadboard noise”, since that’s what I spent most of my time dealing with. In any case, let’s recap where we were. Veronica’s video generator was generating a stable VGA signal. In addition, a test pattern was being displayed by altering pixel colors on the fly during the scanning process (so called “racing the beam”). That’s pretty flashy, but ultimately ...

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Hacking a Blood Pressure Monitor

I’ve been meaning to hack my blood pressure monitor for a while, and I finally got around to doing it! So, the idea is to mod a regular electronic blood pressure monitor to make it wireless and connected to the Internet, much like iHealth BP5 or Withings’. That makes detecting trends in your blood pressure much easier, since you can chart the data and even correlate it with other health data, such as how mu ...

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A Xively AMbient QUality MOnitor built on ATmega328

AMQUMO logs 4 environmental parameters: Humidity Temperature Ambient Noise Brightness The data it is logged to the xively.com platform, and displayed to the user through 4 bi-color leds. It can be used to monitor you Office Ambient Quality over the parameters logged. This project it is built upon the xively logger ATmega328 library: http://davidegironi.blogspot.it/2014/12/a-web-configurable-xively-logger-bu ...

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Battery voltage monitor

This voltage monitor has been designed to remotely display battery voltage so that people monitor and maintain their batteries easily. It was designed for use on off-grid reneable energy systems (such as my solar PV system), but it would also be useful to anyone who has a lead-acid battery, such as caravans, boats and cars. It is designed to plug in to a car 'cigar lighter' socket and display the voltage on ...

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Monitor your H-Bridge Circuit Load

If you have an H-Bridge drive circuit for a motor, you may need a way to monitor the load on the circuit. This circuit is nice because it provides a single output that could be monitored with a microcontroller or other device. The trick is to use current sense amplifiers and measure the current on each leg of the circuit. The LTC6103 is a good choice because it has two sense amplifiers in the same package. ...

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Power usage monitor using Atmel AVR using Atmega168 microcontroller

This project uses Atmega168 microcontroller to compute the power usage at home and logs it to an SD card. It has a graphical LCD display too that shows the power usage as a strip chart. Besides, the voltage and current waveforms can also be displayed on the LCD. The current is measured using a pair of current transformers whereas the voltage is measured using a 2000:1 voltage divider network. An LMC6484AIN  ...

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