stoppi71

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 ;-)

Take a look at my YouTube-Video "segway - first Version" ;-)

Hi!Take a look at my YouTube-Video: Segway-first Version...Then you'll clearly see the Problems I had with the first Setup ;-)

Yes, you'll need a second button (voltage-divider with the 10 kOhm-resistor)... Pin 12 and 13 are low, if the button isn't pushed. If you push the button for steering, the signal goes high...Therefore I ask in the program: if (steering-button-right or left) = high then ...I've changed the Picture of the circuit, because in the first version the status was low if the button was pressed ;-)

As I mentioned above the Problem is the low torque and power for tiny angles. This can be managed with a threshold and/or more powerful Motors. As you can see ín my Video the segway is using the 2 x 250W Motors a bit shaky. I'll try both improvements and maybe I fasten the Loop (at the Moment 100 Hz)...

Hi!I'm using the 7809-regulator because I like to have a bit voltage-reserves...Two times 25A can be enough but it depends on the Motors you use ;-)

Concerning the costs:* Motors 100 Euro* Sabertooth motor driver 150 Euro* complete wheelset: 120 Euro* chain, pinion: 30 Euro* arduino, MPU6050 sensor and other electronics: 15 Euro* lead batteries (used): 30 EuroThe safety Features are, that in the program the maximum-angle is limited with 30 degrees. But I don't have a redundant-System like in the original segways. So it's just a bit for stunt-Drivers ;-)If you let the segway alone, it keeps standing horizontally. If you incline it Forwards or backwards the Motors will stop.

I totally agree. I'll try to improve the code and use a threshold so the Motors don't start at 0 if the angle is very low. This helps to increase the motor-power for tiny angles...

Hello!The 2x2 tube, which I use, isn't a real xray tube. Therefore it doesn't have a filament. You just have to apply the high voltage between the top-pin and the short-circuited bottom Pins.Concerning the circuit diagram: It's just the ZVS-circuit, followed by the cascade. Behind the cascade I use a 2 MOhm high-voltage-resistor and to measure the Output voltage with am ammeter (100 µA) you Need a 1 Gigaohm resistor before the ammeter to get the relation 1 µA = 1 kV ;-)

Hi!What do you exactly mean with special?

I've send you the circuits ;-)

Hi!First you'll Need a negative voltage, around -900V. For this you can use a CCFL-Inverter. For the Receiver you will need some OPA's to convert and amplify the Signal and count the Peaks. Maybe you can tell me your email-address, then I can send you some circuits ;-)