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There are some electric appliances that must turn ON-OFF together in same time, for example TV and satellite or monitor and computer case,...etc, but sometime you forget one of them. By this circuit when you run the TV, the satellite turns on automatically and when you turns off the TV the satellite turns off automatically. The circuit is very simple, when an electric appliance with power consumption more than 10W running, the voltage through diodes 1N5408 increased and the optocoupler runs the relay for switching the second device. You can use this circuit for any other devices such as desktop computer parts. It help to electric consumption optimization. Parts list: Diode 1N5408(3pcs) Diode 1N4007 Zener diode 24v 1W Bridge diode 1A Optocoupler PC 817 Relay 12v Resistor 270 ohm 1W Capacitor 470nF 250v Capacitor 100uF 50v Capacitor 22uF 25v

Electronic locks with password always had a keyboard for inserting the code, but following lock used only one button switch. The code must inserts by pressing the button switch 5 times but with certain delay between each pressing, as you can see in programming code i sets this delay time 1 second delay between four first codes and 5 seconds for two last codes, you can change this code by changing that delay times in programming code. After inserting the correct code the load that connected to pin10 runs for 3 seconds, you can change this delay time in code. If an incorrect code inserts, the red LED turns ON also for 3 seconds. Last important note is the "tolerance" stage in programming code, i sets it on 0.4, that means the delay time between each two pressed buttons acceptable 40% more or lower than the delay time that you write it in the programming code, so 600 to 1400 milliseconds can accepted rather than 1000 milliseconds, or 3000 to 7000 milliseconds can accepted rathe

This is simple wireless power transmission that used Arduino UNO and power transistor. You can use any NPN power transistor such as TIP122 or 2N3055 or 13003 ... etc. Both coils are air-core with similar diameter and similar turns number (30 turns - 2 inches diameter). The output voltage in second coil is alternating (AC) so you have to use bridge diode to convert that to DC. For coil making you can use the chock coils wire of CFL lamp. you can also find the NPN transistor in CFL lamp (usually 13001 or 13003). Parts list: Bridge diode 1A NPN power transistor Capacitor 47nF(2pcs) 30 turns 2 inches diameter air-core coil(2pcs) LED 1.5 to 9v battery Resistor 100R In following video you can see how it works: Please subscribe to my YouTube channel here:  https://www.youtube.com/c/EngMousaalkaabi?sub_confirmation=1 Code: void setup() { pinMode(13,OUTPUT); } void loop() { digitalWrite(13,HIGH); delay(0.5); digitalWrite(13,LOW); delay(0.5); }