555 Timer 40khz Ir
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555 timer 40khz IR:
parts: U1
555 Timer IC
R1
47 ohm resistor
R2
470 ohm resistor
R3
5k variable resistor
C1
0.0047uf ceramic capacitor
LED1,LED2
Infrared LED's
This circuit oscillates two infrared LED's at 40 khz. To make sure it is transmitting IR light, you can get a little tool from radio shack for about $5. It is a small sheet of plastic about 1" by 3" with a special strip of material, that when exposed to IR light glows (it's actually kinda cool..) A way to check for 40khz IR light is to build a circuit that lights an led when 40khz light is detected. You can get the schematic by clicking here. http://www.reconnsworld.com/ir_ultrasonic_555timer40khzir.html
40khz IR tester:
parts: R1
270 ohm resistor
L1
Visible LED
S1
On/Off Switch
IR Module
Sharp GP1U5X IR Detect Module (or compatible)
Use this circuit to test if the light coming from your 40khz IR emitter is really emitting the right frequency. The schematic says to use a GP1U5X ir module, but probably any 40khz detector module will work.. I used a GP1U26X module.
parts: U1
555 Timer IC
R1
47 ohm resistor
R2
470 ohm resistor
R3
5k variable resistor
C1
0.0047uf ceramic capacitor
LED1,LED2
Infrared LED's
This circuit oscillates two infrared LED's at 40 khz. To make sure it is transmitting IR light, you can get a little tool from radio shack for about $5. It is a small sheet of plastic about 1" by 3" with a special strip of material, that when exposed to IR light glows (it's actually kinda cool..) A way to check for 40khz IR light is to build a circuit that lights an led when 40khz light is detected. You can get the schematic by clicking here. http://www.reconnsworld.com/ir_ultrasonic_555timer40khzir.html
40khz IR tester:
parts: R1
270 ohm resistor
L1
Visible LED
S1
On/Off Switch
IR Module
Sharp GP1U5X IR Detect Module (or compatible)
Use this circuit to test if the light coming from your 40khz IR emitter is really emitting the right frequency. The schematic says to use a GP1U5X ir module, but probably any 40khz detector module will work.. I used a GP1U26X module.
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