Wow, way to wait it out (what choice did you have? ).
I had the opposite luck. I had one China clock delivered in 5 days total and a second one which took 7 days total. Pretty good for free shipping from Beijing to Los Angeles.
Alternatively, for remote wireless voltage sensing, you could use a CMUcam and a PC running RoboRealm with blob detection and pattern matching algorithms to visually read the 7-segment LED output on the $1.55 voltmeter, if one wanted to do it the easy way.
I just received a 10-pack of these DVMs I won for $10.08 (incl ship), going on my student breadboards. They only draw 6 mA from the 3xAA supply. Not bad at all, these will replace power-on LEDs which would have drawn that much current anyway!
BTW these are the 3-wire type, which can measure any voltage by moving the white wire connection around. Should come in handy for testing analog sensors, DAC outputs, etc, in addition to measuring supply voltage.
I can't change the title to "$1 Digital Voltmeters" until they are priced BIN individually that low!
Comments
There's no need to do that, you can buy these already configured as such:
http://www.ebay.com/itm/Mini-DC-0-32V-LED-Panel-Voltage-Meter-3-Digital-Display-Voltmeter-Motorcycle-/130978113571?pt=LH_DefaultDomain_0&hash=item1e7ee76823
I've found that the 4-digit ones are much more accurate over their entire input range:
http://www.ebay.com/itm/0-36-4-digit-3-lines-0-33V-Red-Digital-Display-DC-Voltmeter-Digital-voltmeter-/251384988905?pt=LH_DefaultDomain_0&hash=item3a87b684e9
@
I had the opposite luck. I had one China clock delivered in 5 days total and a second one which took 7 days total. Pretty good for free shipping from Beijing to Los Angeles.
Erco - is there a trim pot on the back side that might allow for "setting zero"?
I've been tempted to add a 74HC165 chip to read the LED segments to digitize the reading but I have a feeling that would be doing things the hard way.
I'm particularly interested in some of the current sensors I've seen at HobbyKing.
It would be nice to have the uC able to read these devices.
Well yeah, if one wanted to do it the easy way.
BTW these are the 3-wire type, which can measure any voltage by moving the white wire connection around. Should come in handy for testing analog sensors, DAC outputs, etc, in addition to measuring supply voltage.
I can't change the title to "$1 Digital Voltmeters" until they are priced BIN individually that low!
http://www.ebay.com/itm/Chic-Fashion-0-28-DC-Digital-Voltmeter-Panel-Mount-LED-Voltage-Volt-Meter-Red-/391117437972?pt=LH_DefaultDomain_2&hash=item5b106a7c14
http://boingboing.net/2007/09/21/mit-student-arrested.html
Per the photo, I think they are selling these so cheap is because they were manufactured upside down.