[chbot] Cheap arduino follow up.
chris at trash.co.nz
Fri Nov 14 22:01:11 GMT 2014
(re-sent, got moderated due to attachment :-) )
Photo, thousand words: http://logicalit.biz/forumimages/141114powermeter.jpg
Random follow-up on the cheap Arduino thread a wee while ago.
The $2.38 USD Arduino Micro Pro's turned up a couple of weeks ago, and
I've just used the first of them...
Quality wise they're fine, would prefer routed edges on the PCB's, as
they are a bit rough, but that's just a cosmetic issue.
I managed to kill one by applying 13.8Vdc to the VCC pin, which is not
an issue with the board itself.
The 5V regulator on-board shows 5.12V on VCC with 12.9V input, but
that's outside spec for the device so probably giving the wee SMD
regulator a bit of a hard time. (With 9V it showed 4.99V)
The gadget in the pic is an in-line current/voltage/power meter that
runs a remote LCD screen via I2C (the white cable). Uses a 30A hall
effect sensor module for current. Calculates and displays Wh/Ah and
peak/avg/low power/voltage/current etc.
The wee Arduino is ideal for this as it's a one-off for testing
something and I wanted to fit the unit inside some heatshrink hidden
away inside a cabinet.
Due to the 5.12V issue mentioned above there is a 78L05 regulator on the
back of the veroboard to keep the Voltage reading withing reasonable
No issues using these with an FT232 usb- TTL serial converter and the
arduino software recognises them without any issues..
Excellent value for money if you need to add a small brain to a project
at very much throw-away cost level.
Cheers, Chris H.
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