Brilliant, you honestly save my life (and deserve your name on my project) time and time again.
I was worried that connecting Arduino’s GND pin (i believe that to be the one on the POWER bus by the RESET PIN?) would cause the current from the transistors to flow back into the Arduino, in fact they will just ‘share’ the route to Ground? So all input measurements will be measured with reference to that Ground? And the Ground that comes into the barrel jack is not used by the Arduino for signalling?
The place where I saw the bottom right pin connected to the supply voltage for inductive loads was in the same datasheet,I’ve attached a screen grab.
As far as the Parallax Sensor goes there are two documents:
Parallax’s User Guide: http://www.parallax.com/Portals/0/Downloads/docs/prod/acc/TSL1401-DB_manual.pdf
of which the closest I can get is Top of Page 5 but it’s unlcear
and the actual chip under the lense is linked out from the above guide (link broken actually) so i’ve found and attached too.
That datasheet only uses a Vdd as an input, I was just wondering if that was the same Vdd as the back of the brake out board, because there is also a +5V on the back of the board. It’s just confusing because there’s 11 pins on the board and only 5 legs of the 8 leg DIP actually used?
Wish things were simpler, but then I do love to learn!
Also the bloody thing has 2mm pitch header on the back. I’ve found the 12 Way Crimp Connector that slots in, and got hold of the right size crimps as well, it’s just very hard to crimp the tiny things with a pair of pliers! haha!
TSL1401 Datasheet.pdf (133 KB)