Comments

Author Comment Last activity Moderation
david_uwi " spectrometer16f.gcb.txt " | Read more » over 1 year ago
david_uwi "You've got to be careful with lasers. The visible lines are often not their main emission lines. For instance a green laser (532 nm) puts out more ..." | Read more » over 1 year ago
david_uwi "Yes you're quite correct in an ideal world we would be using absorbance (Log of transmission) and subtracting a blank. There is also a problem with..." | Read more » over 1 year ago
david_uwi " SPEC2018-2-.bmp This is the circuit diagram " | Read more » over 2 years ago
david_uwi "Both glucose and sucrose solutions are colourless so visible light is not going to work. A homemade spectrometer will not go very far into the UV ,..." | Read more » almost 4 years ago
david_uwi "I'm currently looking at the VEML6075 to detect UVA and UVB. It seems to be what I might call "semi-calibrated" that is you can use default setting..." | Read more » almost 4 years ago
david_uwi "Finally got something working using the ic-Haus LFL1402 diode array. https://www.ichaus.de/iC-LFL1402 I normally use 3 V (2xAA bateries) so I had t..." | Read more » almost 4 years ago
david_uwi "When looking at this the only thing that comes to mind is WHY? " | Read more » over 4 years ago
david_uwi "Update: The diode array has gone from obsolete to unobtainable in a matter of a few months. I am testing an ILI1402 (made by ic Haus) which is supp..." | Read more » over 4 years ago
david_uwi "Yes I have no problem with that. It is however more involved than other projects I see on this site. It needs a lot of fine soldering (maybe a PCB..." | Read more » almost 6 years ago
david_uwi "The display uses SPI communication (it has an internal ILI9341 driver). The PIC16F1788 has a hardware SPI module. These type of TFT displays can be..." | Read more » almost 6 years ago
david_uwi "Here's a real spectrum which I stored on the SD card. It is of potassium permanganate. Because there is a very strong absorbance 500-580 nm and the..." | Read more » almost 6 years ago
david_uwi "It uses a TSL1402 diode array (I got mine from digikey) it has 256 pixels. A holgraphic diffraction grating (1000 lines) plastic lenses x2 (3 cm fo..." | Read more » almost 6 years ago