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July 19, 2010
about a year ago
So where’s the rest of the data sheet? Not enough info there to use this cool LED!
about 3 years ago
WARNING - the SOMO-14D DOES NOT WORK with some brands of uSD cards! I bought a bunch of 1GB cards on eBay that were a mixed lot. SO far I can confirm that Samsung cards do NOT work, and I infer from that, that many cards that are pulled from smart phones may not work. Kingston and SanDisk cards DO WORK fine though. I suggest spending the money on brand new name brand cards, so you don’t end up scratching your head for hours like I did.
I got the SOMO-14 working with a 1GB uSD card formatted to FAT16, but my Win7 PC will not let me format a 4GB card to FAT16 - just FAT 32. So I can’t use the bigger cards. Hard to find the old 1GB cards these days. So a warning to other users and buyers that this could be an issue.
about 4 years ago
WARNING! The plastic housing is badly made and the hinge and clasp break very easily on these units. I got one that arrived broken, and the hinge on another looks so weak that it will fail if opened and closed frequently. Current transformers require that the 2 halves be held firmly together for accuracy, so this is a major flaw.
about 5 years ago
I have a project where I need to send analog audio and transmit it to something like a (generic??) bluetooth cell phone earbud. Anyone know whether this module can do that?
about 5 years ago
The “conditioning” period of 48 hours is a one time only thing to get the sensor calibrated. Use 5VDC.
I have been testing the Alcohol Gas Sensor MQ-3 for a day or so now and here is what I have learened:
1: It takes 48 hours to fully “condition” the sensor. Meaning that you have to keep power applied for that long before the readings will settle and become reliable. I used 5VDC and the sensor draws 133mA.
2: Use a 10K 1% resistor. This will give the best range of readings for the sensor despite what the spec sheet says. I get a range of .5 to 4.5 volts with this value, which is ideal for ADC conversion.
3: It responds very quickly to increased gas and take a LONG time to recover. In my test, I rinsed my mouth with wine (13.5% alcohol) and blew on the sensor. It went from a voltage of .5 to 4.5 in a second or 2, but then took over 5 minutes to get back down to .5V.
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