stoppi71

Hi randofo!Thank's for the response. I teach mathematics, physics and practical physics at a high school (from 11 to 18 years) in austria ;-)

Hi! You are looking for a command to print data on the display? I use the command "myGLCD.printNumF(T_max, 1, 395, 45);" for my arduino 320x480 display and "tft.print(T_max, 1);" with the ESP32 and a 320x240 SPI display... Or what do you mean?

Hi! This needs a touch display. If you want to move the whole graph to the right or left you'll have to save more/all values than just one width of the display. But of course it's possible...

Hello! Of course would it be possible to add a Co2 sensor... Then I'd have to add a fourth scale on the right y-axis. There are Co2 sensors which can be read out with an arduino.

Hi! Have you used those two programs, one (Arduino_Lasermikroskop_Processing) for the arduino and the other (Lasermikroskop_processing.pde) for the processing itself? Processing gets 3 values: x-position (within 0-128), y-position(within 0-128) and value from the photodiode (within 0-255)...

Thank's. Yes, I wanted to keep it simple...

Hi! You can see those LEDs I'm using for this photometer in the pictures. I've bought them from Roithner Lasertechnik, located in vienna (austria). With those LEDs I cover the whole spectrum from 400nm to 850nm well. I tried to have just 20-30nm gaps between the wavelengths. On ebay you get 850nm IR, 395nm UV and some others. But f.e. I haven't found 5mm LEDs with lambda between 660 and 760nm. For these LEDs a Laser-LED-company would be the right choice. There are some companies like Roithner Lasertechnik in the USA for sure...

thank's a lot ;-)

Hi! When you use a RGB-Led you don't have different wavelengths even when the color changes. For example when the red and green led are on, then you get a yellow but no yellow wavelength. Therefore it isn't meaningful to use a RGB-Led. Better than so many different LEDs would be a continuous spectrum, which you would get with a monochromator consisting of a white light source, a f.e. Diffraction grating and slits. But on the other hand the light intensity of each wavelength would be much lower then my different LEDs and the setup would be more complicated

Hello! You can see the way how to use it on youtube, just look at the video at the end...

Hello! To get a more laminar flow I use a lot of drinking straws. In the video I didn't use them...

Thank's...

480/128 = 3.75. You need an integer-value, therefore I took 3 with one real sensor-value and 2 interpolated...

Hi! At the moment I don't have anything for saving the data but it's not really a problem to save the data as a csv-file (comma separated values) on f.e. SD-card. For this you have to expand the spectrometer with an SD-card-arduino-shield...

Hi, thank's... No I haven't but i think that there would be no sigificant difference between the white LED I've tested and those from modern LED sources. But I can do that next time...

Hello! I'm a bit disappointed, that my article concerning a cheap infrared thermal camera https://www.instructables.com/id/Infrared-Thermal-... hasn't been featured. Could someone of the community management team tell me a reason for that? Thank's for your efforts, cheers stoppi

Thank's Emanuel for your answer. It slowly brings light into the matter...

Hello!So the CS-defined-pin at the ESP32-board must be grounded?Does it have an effect, when I use the display and another I²C-sensor? Thank's for your help...

Thank's a lot for your help.

Hello! Thank's for your instruction. I want to use your 8pin ili9486 320x480 spi display with one of your presented libraries and esp32. 1.) Could you please tell me the connections between the display and the esp32 and 2.) which numbers do I have to write into the line utft myglcd (ili9486,?,?,?,?)?Thanks a lot for your efforts, cheers stoppi

Hi! For the speaker-movement I use two for()-loops and the loop for the x-movement is within the loop for the y-speaker. The MCP4922 gets a digital value from 0 to nearly 4096 (f.e. 240 steps * 17). With the 10 kOhm potentiometer at the base influences the magnification. The higher the resistance of the potentiometer, the lower the current through the base and the collector of the transistor and the lower the movements of the speaker --> higher magnification

A Faraday-cage avoids electrical fields to go through, not light (photons)

You're welcome...

Hi! I used a common two-component-glue, this one : https://www.vikingdirekt.at/de/p/GB-509062?sgt=QA0...

Yes you can replace the 7805 by using the 5V-pin of the nano. But you have to check first whether the +5V-pin can offer enough milliamps (mA) for the Bridge and the amplifier.

The 7805 is in series between the battery and the Wheatstone-Bridge and the LF353 amplifier. The arduino nano gets the whole 7.4V from the battery....

Hi! The 7805 voltage regulator is used for the wheatstone bridge and the LF353 amplifier. The incoming voltage is about 7.4V from the lipo-accu and with the 7805 you get stabilized 5V, even when the input voltage drops a little bit...

I would say "just try it". But the Signal which you'll get from those single stress gauge will be lower compared to the Wheatstone-Bridge using 4 gauges

Hi! Great to hear from your experiment. I've done a similar one with three geiger Counter tubes, measuring just the coincidence-pulses. I got rates around 12 Counts/hr in vertical direction, going down to 2.7 Counts/hr in horizontal direction. Here's my Video: www.youtube.com/watch?v=fF170T0rB1U

Is the last graph (flux rate vs. zenith angle) yours?

Hi! The more precise they are, the more precise the calibration will be.... I took weights from dumbbells and my own half body-weight (Standing on both pedals...)

At the Moment I use a while-loop. while(angle < 360 degrees) add the forces. if angle >= 360°, calculate the average force F and speed v ---> P = F*v, degrees = degrees - 360° ----> next while-loop

Great work ;-)

No, you'll need the model MLX90614-DCI, which costs about 30 USD

Hi!Yes, they are resistors or potentiometers. I use a 7.4V Lipo accu for powering the circuit. Good luck, Christoph

Do you mean the great plastic container where everything is housed? There's no oil... In air you have to take care of right dimensions (great enough distances between the parts).

You have to take a lot more resistors in series. I use 100 1/4-Watt resistors...

Hi! I have connected the minus-pole of the cockraft-walton (where you've written IN) to ground of the socket. If your power supply has a separate (green) ground-connector (I don't mean the black V- of the power supply) then you can use that... Therefore your sketch with the ground-symbols at the power-supply and the voltage-multipler is right ;-)Good luck, Christoph

No, it's a normal 2X2-vacuum-tube

Hi! I've soldered many 1/4W-resistors in series ;-)

Because of the current through the Speaker, the Membrane is moving outwards (or inwards if the current direction is turned around)...

The freeware gnuplot

Muchas gracias ;-)

Hi! Thank's for that advice. I've already noticed the "steps" in my pictures too. I'll try out just scanning from one side....

Danke, danke ;-)

Thank's for that Information, Ron. I'll try it with a DVD Pick-up ;-)

Hi Venkes!Thank's for your kind words. I started with this Project around christmas with buying used cd-drives... Concerning the laser-colour (the lower the wavelength the sharper) I have my doubts, because when I'd use f.e. a bluray-diode I should use bluray-disc's too, because they are coordinated with each other (reflective colour and so on). And if I do so, I wouldn't have an advantage, because the distance between the pits on bluray-disc's would be smaller too. Can you say something about using red laser not for DVD's but CD's (which are tuned to infrared-laser) or blue laser not for bluray-disc's but CD's? If you get better results than I'll try at least DVD-heads...Cheers Christoph

...between the maximum of 5V and the minimum of approximately 3-4V

Hi!You're absolutely right concerning the voltage-devider, but I didn't have a 1 kOhm 10 turn potentiometer. Therefore I used the 10 kOhm but I'll replace it...The negative-voltage (-9V) is supplied by an ICL7660, which has 10V as the maximum input voltage. Therefore I take +9V to get -9V ;-)

one further question: Do you get great differences with your LDR? I have to eliminate the Offset of the photodiode (about 0.2V, when nothing is placed on the objective table) and then amplify the signal with a gain of 40. Even with this amplification the signals don't vary a lot...

Thank's, the next projects are already waiting...

I do my best ;-)

Thank's a lot

Great work! Maybe you may take a look at my slightly different Version of a scanning laser microscope: https://www.instructables.com/id/Scanning-Laser-Microscope-With-Arduino/

you'll need such a xray-cassette: http://www.rego.de/typg.JPG

thermal Imaging infrared cameras don't have a Limit concerning their range. The only Problem is, that the detected area increases with increasing distance. For example you can measure the temperature of the sky...The opening-angle is at least 5° with those MLX-sensors...IR-light could indeed affect the sensor, because it's measuring the incoming IR-light...

I've to thank ;-)