Member Since: October 15, 2008

Country: United States

  • Thanks for the reply. For the record, I am boosting from a 3.0V lithium primary source. I was completely stumped this morning, so I downloaded the Eagle files. Just noticed that there is an identical 750k (R2) that I thought was R4. Whoops -- wrong resistor! Perhaps R2 isn't too important..since that tiny 750k is long gone anyway. It might be helpful to spin future versions of this board with silkscreen, or at least the voltage divider labeled.

    I am loving the 1A boost capability of this chip, excited to see it in action.

  • Looking for an easy way to adjust the output voltage, although it is not as straightforward as the LiPower.

    I tried changing R4 to 688k and 488k just to see if I could get the divider to alter the output, but the output voltage remained the same at 5.1. Is the inductor critical in reducing the boost? I can't say the datasheet or application notes are very helpful.

    I am looking for something in the 3.6-4.2V range so I don't have to use another stage of regulator.

  • What a horribly depressing output range .. I guess no need for it to go lower, sadly.

    "eCO2: The equivalent CO2 (eCO2) output range for CCS811 is from 400ppm to 8192ppm. Values outside this range are clipped."

  • Whenever I try any of the example sketches in 1.6.7, after installing board files and restarting (per hookup guide), is simply:

    "Board thing (platform esp8266, package esp8266) is unknown"

    It happens during compile. Any idea what is causing this?

  • You are paying for a complete, stand alone module that is easy to use with FCC and Bluetooth certification in quantities of 1. There are similar solutions without an antenna + ARM that price in about half of this. Seems reasonably competitive.

  • Can someone at Sparkfun put this on a scale and tell me how much it weighs?

  • Any trick or tips to boost the loudness of this element when using it as a speaker? It's pretty quiet on it's own -- even with 5V PWM. I understand it is a transducer and, sure, it works great under a pint of beer. I was hoping to make something loud, yet, low profile with this.

  • Can this sensor be used to continuously monitor pH, for example, in a pool setting?

  • Pro Tip: To program without having to connect/disconnect this shield, pull the jumper closest to the edge of the PCB ("MRX"). Just make sure you replace it in the correct position!

    Note that these jumpers do not appear on the schematic or the picture indicated. Not clear what any of these do.

  • Review: Not impressed at all, but at least it works.

    This board shows up in a neat little box, with unsoldered headers. This is really annoying and the picture here is a bit deceiving. The whole point was to save time and not break out my soldering iron station. Heck, if i knew this, i'd be happy with a bucket of parts -- because it would probably take an equal amount of time anyway. Okay, so fine, i solder it up...causing the beautiful silkscreen flood to turn a golden marshmallow brown around the headers.

    The product description brags how it can connect to "equipment and automation prototyping" and implies that it operates as an old computer with a serial port. Great, well, how about just a modem? that sounds simple. Wrong. Not only does this shield sport the wrong gender of DB9, but the transmit and receive pins are swapped! To connect something like a modem (or serial printer, or other serial device), better get yourself a null modem and two Male-Male DB9 connectors. (good luck finding a male-male null modem combo cable). Also, don't bother purchasing the DB9 serial cable on sparkfun with this. It won't do you any good.

    The shield mostly fits my Mega, however, the board hits the USB jack before it can make a completely solid connection (although its secure enough to where i haven't seen an issue). The RS232 cable and USB are also very snug with one another. It should fit any other arduino Uno on up, assuming the header pattern is the classic pattern.

    And finally, no flow control pins are wired up. Yes, the MAX232 would support it just fine, but it appears that nobody ever thought someone would want this. Thankfully it is not in my application, but I know some other folks who really find this useful.

No public wish lists :(