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Infrared flashlight remote control (high power)

Overview

I chose the infrared lamp beads that are available, cheaper ( one yuan), and as powerful as possible . The seller’s nominal 3W , current 700ma , is for supplementary light for monitoring . However, can’t the light-filling lamp beads be controlled remotely? I haven't found any relevant information. The theory is feasible and requires experimental assistance. I bought lamp beads and they can indeed emit 108ms coded pulses according to the 38kHz PPM code of ordinary infrared lamp beads (3mm, 5mm, etc.). However, at that time, a 5v to 1.8v step-down module was used, and the output terminal was only 1.08v after connecting a 3.7v battery. The infrared distance was very close, and the purpose of the experiment was not achieved.
Use 3.7v directly and string a 3Ω resistor in series. The calculation formula of the resistance is as follows: (3.7v-1.8v)/700ma≈2.71Ω. I only have a 3Ω one in hand and it just happened to be connected in series. The actual measurement cannot even reach the maximum power.
Since the lithium battery voltage changes at (3.7, 4.2), it is still not stable enough , so I use TP5400 to boost the lithium battery to 5v (5v 1a). This chip is quite powerful, and the resistance (5v-1.8v)/700ma≈ 4.57Ω. To be on the safe side, 5Ω is connected in series here (the more common one is 4.7Ω or 4r7).
Purpose: You can control infrared equipment from a distance and use it to do bad things (seewo whiteboard with infrared control)
Pre-use 18650 to look like a flashlight.

Design Files

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Update:2025-05-08 12:40:19

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