Archive for July 2012

I/O LED (Part 5)

Part 1, 2, 3, 4, 5, 6 And now comes an example of an effective use of the I/O LEDs: single LED communication. the next coming  videos illustrate the operation of a simple but yet full of promises application. Two identical modules are used, each of them using an Arduino Nano, a LED and a switch. When pressing the switch, the sketch will […]

I/O LED (Part 4)

Part 1, 2, 3, 4, 5, 6 Here is a new version of the sensing LED. The sensing LED is turned on almost all the time, with very short periods of time during which it is biased as a photo LED. The measuring time is so short that it is almost impossible to observe the flickering effect. Approaching a source of […]

I/O LED (Part 3)

Part 1, 2, 3, 4, 5, 6 Additional works on I/O LED brought me to publish the next coming posts. Firstly, I observed that amongst the various LEDs tested from my stock, some were simply not suitable for I/O operation, while the high brightness red LEDs where performing optimally. Here is an illustration of the simplistic hardware that you may use […]

Extremely Low Frequency Electro Magnetic Field Sensing (Part 3)

Part 1, 2, 3, 4, 5 This post deals with the sensing antenna which can increase the sensitivity of the MicroELFEMF application One of the difficulties posed when sensing ELF frequencies is antenna size. This is because the antenna must be at least a substantial fraction of the size of the wavelength of the frequency of the EM waves. […]

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