SparkFun will be closed Nov 26th and 27th for the Thanksgiving holiday. Orders placed after 2:00pm MT on the 25th will ship out Monday the 30th.


Member Since: April 14, 2010

Country: United States

  • These headers are AWESOME! Why? You can stick solid core 22awg (22 gauge) wire right into them and it will hold it very strongly. Stronger than a male machine header pin, even. There’s a downside to this though: If you do stick some 22awg wire into one of these female headers it will render that female header unusable with regular male machine header pins forever. As in, once you go 22awg you never go back (hehe)!

    Having this knowledge, I find it easier to make male machine header connectors by plugging 22awg wire into the female headers and then soldering them like that. Soldering wires to the male machine pin headers is kind of a pain. Best way I’ve found is to plug the male headers into a breadboard and solder them that way. Not that different from trying to solder wires directly to male square headers (aka Dupont headers).

  • I’ve been playing around with this sensor over the past few days and I thought I’d share my findings…

    The sensor is sensitive to CO2–not just CO. So if you blow on it your breath will increase the reported values (val +330 if I try real hard by holding my breath before I blow on it =). This means that if you want to use it as a fart detector you need to keep out of the direct exhale path of heavy breathers. I also suspect that the humidity and cooling properties of your breath amplifies the effect.

    Tip: You can perform a quick CO2 test with your breath or you could just pop open a can/bottle of soda right next to the sensor.

    The sensor is also sensitive to sudden temperature changes. For example, if you grab it with your fingers it will drop the temperature (which hovers around 50 degrees celcius) a few degrees very quickly. When this happens the values coming off the sensor will be increased by about 30 to 100 depending on how long you hold it and how cold your fingers are.

  • I know it has been a long time since you asked this question but I’ve done some testing and I have the answer: The gas sensor takes about one minute to “warm up” to the point where it is producing stable values.

  • The only problem with this setup is the inability to charge the batteries in series. You’d have to disconnect the batteries and charge them one at a time with a LiPoly charger.
    …unless there’s another way to charge the batteries in series? Or perhaps rig up some sort of software switching control via a microcontroller to swap which battery is connected to the LiPoly charger (now that’s an idea!).

  • Will this work with an ID-2? I assume it will based on the video demonstrating the RFID USB Reader (The ID-2, ID-12, and ID-20 all appeared to fit the same sockets).

No public wish lists :(