UPDATE 11/16/2017 6:40:AM
Final version of the Motor Control Targeting Interface unit for the diffraction grating turret control system:
A calibrated Solux lamp spectrum (mine,) 4700K/50W/12vdc/1.2A/0.10mm slit width
Turret @ zero position (baseline) 0.00 nm/ Integration time: 150ms
2400ln/mm diffraction grating:
7 Dark Count scans I did to determine which integration time is the most ideal and it appears to be 50ms, 15ms and 10ms:
CCD detector Allmon & Haffner v1.1 is done.
New 8-Bit TCD1304 CCD detector driver board
8-Bit Main SCH 1
8-Bit Sheet 2
Cost analysis comparing Raman Spectrometers and Lasers from StellerNet Inc. to the DAV5 V3.01 3D printable Raman Spectrometer:
DAV5 V3.01 Raman Spectrometer uses an Aries 532nm 150mW CW/DPSS Green Laser
Cost - $ 199.99 US
The DAV5 V3.01 3D Printable Raman Spectrometer
DAV5 V3.01 Raman Spectrometer - $ 657.35 US
Here is the 3D view of the turret control interface unit for controlling the stepper motor, which turns the diffraction grating mount inside the spectrometer.
2 new spectral images today using a 0.1 mm acetate (film) slit, I allowed only 2 mm in length, of light to pass through the monochromator.
I cleaned the CCD noise up a bit and readjusted R4 and R7, and it certainly made a big difference, also the significantly narrower slit width makes a difference too.
The values for R4 and R7 are approximate for the breadboard, since the runs are longer than they would be on a PCB, but this gives me a great calibration starting point when the circuit is put together and ready for testing.
As you can see in the above image, the entrance slit is a rig I designed about a year and a half ago.
New CCD Spectrograph Hardware and Software
This unit captures all of the TCD1304's 3648 pixels using the ADC0820 8-bit half-flash converter. The time to digitize a frame is 32mS. At 115.2kBaud it takes a couple of seconds to download a frame.
An ATmega1284 was chosen as the microcontroller. It has 16kB of RAM, which is double the Arduino Mega2560. The sensor is the Toshiba TCD1304AP, a 3648 pixel linear CCD sensor which operates on a single voltage (3.0V to 5.5V). The sensor is driven directly by the microcontroller, and the analog output is buffered by a transistor and an op-amp. The signal is digitized by an AD0820 analog to digital...Read more »