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micro_engineer

Member Since: November 15, 2008

Country: United States

Profile

Bio

Embedded Systems Engineer

Role

Battery/embedded electronics designer, & hobby designer

Spoken Languages

English, spanish

Programming Languages

Assembly, C, VHDL, some C#, C++

Universities

Auburn University

Expertise

Embedded systems (FPGA, microcontrollers), audio, some power supplies, PCB design/prototyping/repair,

Interests

Embedded sytems, LEDs, and lots more!

  • As the units do not appear to have individual serial numbers or addresses (like Maxim 1-wire devices) you can’t do it without some trickery.
    I can think of a way to do it, however, with a minimum of 3 pins, off the top of my head.
    That would be a 2-wire serial-in, parallel-out shift register circuit (to provide multiple control lines) plus one input pin on the MCU to read the DHT22’s responses.

  • When I spoke with a National Semic. sales rep. recently the other models weren’t quite out yet. I look forward to trying one out soon.
    FOOTPRINT: regarding the footprint, yes, like many other footprints on modern components it’s not the easiest for a hobbyist to deal with, but you must get used to making custom foot prints in your favorite CAD program. It’s just a fact of life.
    On the other hand, I can tell you the package is quite small and very efficient in terms of space and cost. I look forward to trying it out.

  • Note: The PIC’s speed is actually 8MHz/4 = 2MHz instruction cycle speed. (This is typical for mid & baseline PICs). See 16F8** datasheet.

  • Look nice (except for the pollution). Were the vendors selling in small quantities or only large?

No public wish lists :(