Multi proyectos 0076

This is a quick (REALLY quick) writeup on establishing a connection between the Arduino Duemilanove and LabVIEW.  I used a very simple setup where the Arduino would send its data via serial, and the listening LabVIEW would ‘hear’ it and plot it to a waveform chart.  To achieve 2-way communication, the Arduino would listen for a command at the beginning of each iteration.  If a command was heard, it would react by turning an LED on or off, depending on the command received.  If nothing was heard, then it would continue on through the analogRead() cycle to measure the drop across the potentiometer.  The method is inefficient and barbaric, but my intent was proof-in-concept.  The concept may be improved upon to increase reliability and efficiency, but I have not had the time to do so.

- Following MIDI clock
– Recording and playback of 40 note long MIDI sequence
– Sending custom strings of MIDI messages in sync with MIDI clock including:
– CC information to fade video on Edirol V4 (synced to PAL)
– CC information to fade output on Edirol V4 (synced to PAL)
– CC information to fade video layers on Korg Kaptivator (synced to PAL)
– NoteOn data to trigger light flashes via MIDI-DMX converter
– Triggering audio loops on Korg ESX1 so they could be longer than the pattern played on ESX
– Triggering AR and Filter envelopes on Sherman Filterbank
– OneKnob functionality extending Korg ESX1′s ability to only control one part at time. With AV-Brain you could learn a NRPN message, assign it to a knob and use independently of device’s state.
– Fade up or down relative volume of all the channels on ESX1 – Filtering MIDI messages
– All sequencer tracks can be synced to 1/16, 1/8, 1/4, 1/2, 1, 2, 4, 8, 16 or 32 beats
– All sequencer tracks can be re-synced manually and still follow the tempo (to compensate for video delay)

• Dean Camera of LUFA, the lightweight USB framework for AVRs that forms the basis of the USB-serial firmware on the ATmega8U2 on the Uno and Mega 2560
• Zach Eveland who got the 8U2 firmwares working and tested
• Peter Knight of optiboot, the bootloader we’re using on the Uno, saving 1.5 KB of flash memory for your sketches
• Mark Sproul who tested and debugged the ATmega2560 support (including the new stk500v2 bootloader)
• Hans-Cristoph Steiner who developed Firmata, the default firmware on the Arduino Uno and Mega 2560, and Paul J Stoffregen who ported it to the Mega

The building is in the shape of a cube and formed by large iron beams covered in a plastic coating of inflatable bubbles, which offer glimpses of the fluorescent structure of the building. The attractive covering also has a functional utility as a way of regulating light and temperature, primarily preventing 114 tons of CO2 a year from escaping from the building, and offering a 20% saving on climate control.

Every facade of the Media-TIC is different: from the outside, they reveal parts of their interior spaces and give a diverse plasticity, while from the inside they offer spectacular views.

The MQ-3 is an alcohol gas sensor that is available for about $5 from Sparkfun,Seeed Studio, and others. It’s easy to use and has sparked the imagination of anyone who has dreamed of building their own breathalyzer device for measuring the amount of alcohol in the human body. I got an MQ-3 sensor a couple of months ago and have spent a lot of time trying to figure out how to do this. After lots of “data gathering”, I found that this task is not as easy as it sounds.

It’s really hard to calibrate this sensor for even an approximate BAC reading. It’s even difficult to correlate readings to looked-up BAC values. There are many environmental factors that affect the resistance within the sensor (humidity, temperature, oxygen concentration), and this is only a $5 device anyway. And as evidenced by the lack of consistency between online BAC calculators, there’s not even concensus about how to compute BAC. Law enforcement agencies have much more sophisticated breathalyzers, and often rely on actual blood tests or urinalysis for evidence.

It is a small device that allows the transmission of a signal between parts of a circuit while keeping those two parts electrically isolated. How is this so? Inside our typical optocoupler are two things – an LED and a phototransistor. When a current runs through the LED, it switches on  - at which point the phototransitor detects the light and allows another current to flow through it. And then when the LED is off, current cannot flow through the phototransistor. All the while the two currents are completely electrically isolated (when operated within their stated parameters!)