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Jul 28, 2025
d4ac3f5 · · Jul 28, 2025

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IR Shotgun

This is a IR shotgun (blaster) for the flipper zero that uses 8x APTD3216F3C-P22 infrared LEDs to absolutely FLOOD a room with infrared light.

How does it work?

The flipper zero drives the A7 pin with PWM, which in turn drives the AO3400A MOSFET. The MOSFET then turns on and off the IR LEDs.

How does this compare to the Rabbit Labs IR Blaster?

This blaster is (I think) a bit more powerful, and more directional compared to the Rabbit Labs IR Blaster.

Design choices

  • Instead of using 1x3 pin headers, I used 2x3 headers to provide better structural support for the blaster PCB.
  • I used the AO3400A MOSFET over the 2N7000 because it's able to handle more current.
  • My calculations for the resistor values for the LEDs (70 ohm -> 68 ohm) were based on the DC Forward Current of 50mA and not the peak forward current of 1200mA.mA.

Pictures

render blaster back blaster base

BOM

Name Qty Price Per (USD) Total (USD) Link
90 Degree header 1 $0.67 $0.67 https://www.digikey.ca/en/products/detail/w%C3%BCrth-elektronik/61300621021/4846834
0.1uF 0805 cap 1 $0.08 $0.08 https://www.digikey.ca/en/products/detail/samsung-electro-mechanics/CL21B104KBCNNNC/3886661
10uF 1206 cap 1 $0.08 $0.08 https://www.digikey.ca/en/products/detail/samsung-electro-mechanics/CL31B106KAHNNNE/3887462
IR LED 8 $0.52 $4.16 https://www.digikey.ca/en/products/detail/kingbright/APTD3216F3C-P22/8591562
AO3400A MOSFET 1 $0.46 $0.46 https://www.digikey.ca/en/products/detail/alpha-omega-semiconductor-inc/AO3400A/1855772
68 ohm res 4 $0.60 $2.40 https://www.digikey.ca/en/products/detail/susumu/HRG3216P-68R0-D-T1/5762544
10k res 1 $0.10 $0.10 https://www.digikey.ca/en/products/detail/stackpole-electronics-inc/RMCF0805FT10K0/1760676
15mm pin headers 1 $3.43 $3.43 https://www.aliexpress.com/item/1005006783391171.html
Blaster PCB (JLC, LeadFree HASL) 1 $5.20 $5.20
Base PCB (JLC, LeadFree HASL) 1 $5.20 $5.20
TOTAL $21.78
NOTE: Most of the resistors/caps here cost more in packages of one than in packages of 10+, I'd suggest ordering 10 of each
USD
JLC - DHL $17.50
DigiKey $5.84
Grand Total $45.12
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