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If someone is interested in DIY wireless remote control, they might want to check out the content of this article.

If someone has an abandoned fishing lamp, which uses a set of 4-channel wireless remote modules, they should note that the lamp’s main control 4-channel outputs are active low. However, when connecting an external button debug board, the LEDs may glow faintly even in a static state. Each of the 4 outputs has a 10kΩ resistor, but there may still be slight LED brightness. Increasing the resistor would reduce the LED current. In this case, one can try removing the button debug board before assembly. This may resolve the faint LED glow, which could be caused by the debug board’s LEDs pulling down the static high-level voltage.

If someone has an abandoned flashlight with no battery tail cap, they can assemble an external casing themselves. They can apply a transformer to the tail of the flashlight and attach a plastic tail cap using AB glue. When converting it to a wireless remote control, 4 LEDs can use three channels, which happen to be yellow, white, and blue—sufficient for fishing. The control board mode should be changed to interlock, with the last channel turning off the LED. The LED constant current is around 1.05A, and the remote control works perfectly.The production process images are shown below.

The circuit diagram is shown below.

The rear casing is from a Gree water purifier filter shell. The material is good. For waterproofing, silicone chair leg covers can be used, which will ensure complete water resistance.