Hello.
I want to make a simulated security camera. The idea is that the IR leds emits at night in case the thiefs check that. I´m going to put 27 IR leds.
If my calculations are right, the IR led works with 1,2V and 20mA. I´m going to power it with a rechargeable lithium battery 3.400 mAh and 3,7V. I´m going to put 9 groups in parallel of 3 led in series, so the voltage drop in each series will be 1,2x3 = 3,6V and the total current will be 20x9 = 180mA. But this only gives me 3400/180 = 18,9 hours. Is that right?
If this is the case I´ll need to power it with a power supply. And the other question is, do IR leds dissipate a lot of heat?
Thank you.
Best regards
I want to make a simulated security camera. The idea is that the IR leds emits at night in case the thiefs check that. I´m going to put 27 IR leds.
If my calculations are right, the IR led works with 1,2V and 20mA. I´m going to power it with a rechargeable lithium battery 3.400 mAh and 3,7V. I´m going to put 9 groups in parallel of 3 led in series, so the voltage drop in each series will be 1,2x3 = 3,6V and the total current will be 20x9 = 180mA. But this only gives me 3400/180 = 18,9 hours. Is that right?
If this is the case I´ll need to power it with a power supply. And the other question is, do IR leds dissipate a lot of heat?
Thank you.
Best regards