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Anonymous users2024-01-24First of all, the mobile phone battery is about around, and this value can generally light up a small light bead (mini LED). Secondly, the power of the mobile phone battery is about 2000mA, and the maintenance time is about 6 hours. The above is the determination part, there are many models of photoresistors, I don't know which one you use.
But most photoresistors are that the stronger the light, the smaller the resistance. Of course, there are also weak light with small resistance. The resistance value is also uncertain.
The above is the uncertain part; How to make it: Determine the resistance value of the LED, as well as the normal starting current (when the current is what the LED starts to glow). and the current size of the battery, according to the measured LED starting current.
Select the photoresistor (1. When the resistance value is maximum: circuit current = battery voltage maximum resistance value,。。 Minimum resistance:
Circuit current = battery voltage minimum resistance, and circuit current >> LED starting current) meet the above conditions, connect the battery, LED, and photoresistor in series. . .
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Anonymous users2024-01-23How to make it: Determine the resistance value of the LED, as well as the normal starting current (when the current is what the LED starts to glow). and the current size of the battery, according to the measured LED starting current.
Select the photoresistor (1, when the resistance value is maximum: circuit current = battery voltage maximum resistance, the minimum resistance value: circuit current = battery voltage minimum resistance, and the circuit current > LED starting current) to meet the above conditions, the battery, LED, and photoresistor can be connected in series.
Note: The mobile phone battery is about the same, and this value can generally light up a small light bead (mini LED). Secondly, the power of the mobile phone battery is about 2000mA, and the maintenance time is about 6 hours.
Most photoresistors are the stronger the light, the smaller the resistance.
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Anonymous users2024-01-22You want to make it glow automatically at night, right? LEDs require a string of about 100 ohms. For the control part, you can consider using a MOSFET as a switch to connect the photoresistor between G and the ground, and G and the positive pole of the battery are connected with a resistor of more than 1M, and the resistance value is determined by the test.
S pole to LED. If the battery is charged every day, the requirements for power saving are not too great.
The electric box comes out to the switch panel, and then the zero line and the live wire in the two places also pull down the switch panel, you can buy a double-open switch, you can also double-open single control, double-open double control.
Don't use it, put it in the vent, let it for at least 2 days, and when it's completely dry, you can use it when it's dry, and you can use it if it's dry, and it won't explode, so you can only buy a new one.
Connect the live wire with four switches, don't connect the neutral wire, see if that's the case.
This is a problem with the power supply, and it is good to have a resistor at the output.