I'm trying to interface with a few Position sensing detectors (PSD) from Thorlabs:http://www.thorlabs.com/NewGroupPage9.cfm?ObjectGroup_ID=4400&pn=PDP90A
sensors are Vcc +-5V +-5% 9x9mm
Output is 3 DC signals per unit at about 12 bits precision with max output of +-4V.
Max output power is based on laser power so it is variable.
Obviously, we are talking about lab quality equipement so precision is outmost priority.
I was planning on averaging measurement every few cycles to reduce noise and maybe even input on multiple pins.
Output is simply showing data on a 4x20 LCD screen
First, you have to understand that this stuff is new to me. I probably spent 100 hours on that since the last 2 weeks. I'm a mech eng so I'm sort of venturing to the dark side here...
Anyway... I was trying to few an alternative to thousand $$ cards when I found out about the arduino. It kind of seemed to good to be true at first.
Then I realized that the ATMega 8 bit is only using a 10bit A/D wich lets face it looks like a dealbreaker. I found out that it is possible to bolt an outside 12+bit A/D.
After, I found out about the Leaflabs Maple with its 32bit (no need) ARM processors and 12bit A/D. I then realized that this bitch is running 3.3V
1. Noise level: Usually, is it beter have sensor running at high or low voltage (3.3 or 5V)?
2. Noise level: 12 vs 72MHz MPU , is it going to matter?
3. I/O: Lets say my max output voltage is about 4V, should I use that as my reference voltage for more precision?
4. Any Sheild with a 12+ A/D
5. On a general basis, is it better to supply voltage to sensors from the board or outside powersupply?
6. In my case, ATMega (arduino) or ARM (Maple)?
7. Any tip on a general, professional looking electric connector to join the LCD and Arduino? (Hirose?)
Thanks a lot!