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Water Level Indicator with Alarm
A few people had asked what switches I used, including a recent email. Just search ebay for tank float switch. They're plastic and sealed and are designed to be submerged.
Not to hijack the OP's thread, but a big difference two years makes. Now using wifi Particle Photon board, Blynk, and IFTTT to remotely monitor w a smartphone app and receive notifications when my water level is low. Also sends a trigger to text my water supplier that I need a fill automatically. All inspired by this original instructable.
Can I do the opposite with it i.e from Ps/2 to USB conversion
Hacking FM Transmitter
this is my transmitter. it has 4 channels. 88.1,88.5,88.9,89.3.the pcb i soldered to the battery compartment and i cant find my iron.
VHF Scanner Antenna
Antenna Balun for a Folded Diapole
USB to PS/2 convertor
Active Sound Mixer
Hi! I just made this mixer and it doesnt work. As I can see, all the signal is going through the two parallel resistors and then directly on the electrolic capacitor. The transistor is not being used. Unless there is a connection between the colector of the transistor and the electrolitic capacitor, but in this case, the sound goes out with a lot of distortion. Can you please help me?Thank you very much!
While using npn, the led will glow if the contact did't connect.If you need so you can add another npn with the pnp.
If we use 'carbon brush' as sensors we can remove the metal rusting.
what will happen when we use npn transistor instead of pnp for water level indicator
Nice mod sir, congrats :). I have a Saitek ST220 Digital Joystick with an old 15 pin game port connector. Is it possible to mod it into usb?. Problem is device driver availability. After intensive search no one seems to have published a mod like that. Someone published an usb ball mouse steering wheel mod very nice, and I'm thinking this mouse circuit board could be used for the Joystick. http://usabuzz.net/page/watch/vid2016WoABrWUetfA
You can use some floating-type sensor!
Hi!Please let me know if a 9 V DC battery can be used instead of the setup you used?
Is drinking from the water that is being measured a problem?I was wondering if the wiring could degrade into the water and cause an ingestion hazard.
thanks for the tutorial, can another transistor be used instead of the one in the schematic diagram. pls give me the name, because i couldnt that transistor here, answer plsssss
hi raikut,I connected 6v relay across led + resistor (470 ohm), and relay is operating when led glows. will it be okay or will harm the circuit after in future? - shrirangt
The circuit shows an NPN transistor and the positive of the supply is connected to the emitter through the LED and the collector goes to 0V. As this is a NPN transistor the collector should be positive in relation to the emitter. Can you please explain how the current flows through the transistor.ThanksKamal - KamalS46
Hi! I made this:On the picture of PCB i markd the modifyed parts. Replace L1 to 3k3 Yellow (i don't know, is the value correct, but it works)Replace L3 to 0R (bridge) PurpleSolder out C3 (blue, red), sold black the blue, red must be open. sold the antenna to the flying side of capa. (lambda/4, ca 0.7...0.85m)L2 C2 is a resonant filter. (Orange) This values give ca 98MHz. You can optimize it to your selected FM freq. (I placed a 110nH and 22pF). At the resonant frequency you have much more signal. It's not easy. Dispension of an inductor can be 30%, a capacitor 5%.
Are you giving instructions or narrating a story?
Anyone experimented on a transmitter like this?
i'm looking for a water level sensor that i can mount on the floor and yet it can still detect level of water without exposed wire needed.. some kind of laser/wave detector.is it possible?
can i use 9v 500 mA Transformer for this project. i circuit is working fine when i touch to wires of +5V and level 1 detector. but when i submerge in the water. It is not working
HII like yours idea. I made on similar steps but with different concept. It WIRELESS.You can check this on my website www.vapory.inor buy online http://www.snapdeal.com/product/vapory-white-wireless-water-level/636257896076
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