the simple way to build an ir tester
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Step 1: Schematic Diagram
all you need is a led, an ir receiver and a coin battery
the range is only 5-15cm (good to test a remote control)
Step 2: Print the .stl Files
print the .stl files or find a nice box for your project
Step 3: Make the Connections
make the connections and glue the led and the receiver with instant glue
Step 4: End
glue the two printed parts and add a coin battery
i use CR 2025