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  1. S

    Help needed with mini portable alarm project

    HI! I can suggest you a PIR sensor to use as detector: https://www.sensorinstock.it/en/various/679-pis-209b.html In order to expand the detection beam you may use a Fresnel lens like this one: https://www.sensorinstock.it/en/various/569-l7709-4w.html Hope to be helpful and good luck! Byee:):)
  2. S

    Ant Detecting Sensors

    Hi!! The idea to use a photo interrupter is great! I think this one could be a good sensor to reveal ant passing: https://www.sensorinstock.it/en/photo-interrupter/452-ki1138.html The slot width is 5mm and the height of the slot is about 8mm This wat it can detect the small animals ;) Hope...
  3. S

    Watering system

    Hi! If you want to use something more accurate than a sponge you can use a rain sensor like this: https://www.sensorinstock.it/en/various/762-tc440006814.html It's like a capacitor which capacitance reveal if it's raining. On the back of the sensor there is an heater which helps to avoid...
  4. S

    Circuit analyser, simulator

    Hi! I always use Multisim! Online you can use EasyEda Hope do be helpful!
  5. S

    SIM project

    Hello! Arduino and GSM module are the best solution! You can send "AT-COMMANDS" with the UART protocol from arduino to GSM and it will automatically send the SMS. When you receive an SMS the GSM send a String through the UART to arduino where you can compare to a string in the memory and act...
  6. S

    Switch needs to remain on for certain time

    Hi, The 555 is the smallest solution you can find, i think. You can try to make a double layer prototype PCB and use a NPN transistor to drive the motor Hope to be helpful!
  7. S

    Need a simple circuit to reset a device very X minutes

    If the blt module has a reset pin the 555 should be the best option! Anyway you can try to supply the module through the 555 monostable and see what happens:)
  8. S

    What is this?

    Hi! I suppose it's a motion detector module! By the third pic i suppose to see a Fresnel lens and i think it contains inside a Piroelectric sensor! Try to switch it on and see what happens! Bye!!
  9. S

    Sound activated light

    Hi, May a microphone be enough? When it detects a sound it generates a current. You connect the microphone to an amplifier and then connect the output of the amplifier to a red led through a 300ohm resistor. This way when you make some noyse the red led flashes Hope to be helpful!!
  10. S

    Arduino relay driver circuit

    Yes it's for protection. When you switch of the relay, the diode avoid current to flow through the NPN and damage it By!
  11. S

    Electric Toothbrush

    Hello. I agree with steve. Maybe you can manage to repair it by opening it and make some changes depending on what's wrong. The real problem will be when you will close it. If it's not well sealed and water enters it, this will create big problems. Be careful and good luck!
  12. S

    Need a simple circuit to reset a device very X minutes

    Hello, I am not sure this solution can be suitable for you.. But what about using a monostable with NE555 and a transistor to drive the output? Hope to be helpful!
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