david_uwi 3 research notes and 3 wiki edits | Joined about 3 years ago

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Particulate sensor using a STBM271

by david_uwi 5 months ago | 4 | 195 views | 7

Simple data logger

by david_uwi about 2 years ago | 11 | 457 views | 6

Homemade spectrometer

by david_uwi over 2 years ago | 12 | 1,293 views | 4

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" It's going from 0-250 ug/m3 (and the x-axis is 42 days).The average value (over 6 weeks) is 17 ug/m3. So the graph shows there are some large spik..." | Read more » 5 months ago
" Problem I have is that sucrose solution looks colorless so does not absorb visible light. I feel that the changes in absorbance that you are seein..." | Read more » 5 months ago
"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 » 6 months ago
"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 » 6 months ago
"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 » 7 months ago
"I've found that the clock timing with the Toshiba arrays is not quite as rigorous as suggested in the datasheet (I've only tried it with the TCD110..." | Read more » 12 months ago
"There's something strange about your "spectrum" it seems to run green,yellow,pink,blue,green. Seems like there are several overlapping color patter..." | Read more » about 1 year ago
"When looking at this the only thing that comes to mind is WHY? " | Read more » over 1 year ago
"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 1 year ago
"Sadly the diode array has also gone from "end of life" to obsolete to unobtainable. I'm getting the same problem with my design https://publiclab.o..." | Read more » over 1 year ago
"Thanks for bringing this to prominence again. I will attach the code that runs the microprocessor. presslogger.txt This as mentioned above is wri..." | Read more » almost 2 years ago
"Oh well. I know about everyones strange reluctance to use microchip devices, but really they do not keep much of any value to the experimenter hidd..." | Read more » about 2 years ago
"I just use my programmer to read the falsh memory when it is getting full. The clcok crystal causes an wake-up (from sleep) interrupt when the time..." | Read more » about 2 years ago
"Yes it would seem that you could do it with an atmega 328 one of the timers supports the use of a clock crystal which will get your timing accurate..." | Read more » about 2 years ago
"I finally got round to making the Raman spectrometer. I first tried at right angles and as you found I got nothing. So I went for the transmission ..." | Read more » over 2 years ago
"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 » over 2 years ago
"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 » over 2 years ago
"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 » over 2 years ago
"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 » over 2 years ago
"Thanks for the detailed explanation. I've seen that back scatter is a popular cofiguration what do you think? you are getting the same axis as tran..." | Read more » about 3 years ago
"I am going to attempt a Raman spectrometer. As I am in the design stages I was wondering why you chose "transmission" I am tempted to monitor at ri..." | Read more » about 3 years ago


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