potatoartist / Laser Tag

Project Information

A simple atmega328 @ 3.3v and 8MHz with some IR transistors and a laser diode
Schematic Status
Layout Status

Schematic and PCB Layout


Warning! There is at least one mistake here. I made this circuit (ordered the PCB from oshpark) and it works, but I had to replace the cap on the 3.3v regulator output with a larger cap (22uf electrolytic) and more importantly the TX and Rx aren't swapped and they need to be.

Bill of Materials

Part Number
Actual Part
Unit Cost
Order Qty
Total Cost
laser_current_limiter 1 kΩ Resistor Panasonic ERJ-8GEYJ102V 1206 P1.0KETR-ND 1 0.1 1 0.1
C10, C11 22 pF 5% 0805 Capacitor AVX 08055A220JAT2A 0805, 2012 478-1308-2-ND 2 0.1 2 0.2
Phototransistor 1, Phototransistor 2, Phototransistor 3, Phototransistor 4, Phototransistor 5, Phototransistor 6 Phototransistor Everlight PT333-3C 1080-1157-ND 6 0.41 6 2.46
U89 500mA-Peak 3.3V Output LDO Regulator Micrel MIC5219-3.3YM5 SOT-23 No Digi-key Number 1 ?? 0 0
0.1uf cap DTR, AREF cap 100 nF Capacitor Murata GCM21BR72A104KA37L 0805 490-4789-2-ND 2 0.15 2 0.3
Laser ctrl npn NPN General Purpose Amplifier Fairchild Semiconductor 2N3904 TO-92 2N3904FS-ND 1 0.18 1 0.18
LEDSISTOR 1, LEDSISTOR2, LEDSISTOR3, Rilim, 220-250ohm 220 Ω 1% 0.25W Resistor Surface Mount Vishay CRCW1206220RFKEA 1206 541-220FCT-ND 4 0.102 10.0 1.02
Pulldown S1, Pulldown S2, Pulldown S3, Pulldown S4, Pulldown S5, Pulldown S6, Reset Pullup, Trigger pulldown 10 kΩ 1% 0.25W Resistor Surface Mount Vishay CRCW120610K0FKEA 1206 541-10.0KFTR-ND 8 0.1 8 0.8
Life1, Life2, Life3 5mm Green LED (Diffused) Lite-On LTL2R3KG RADIAL No Digi-key Number 3 ?? 0 0
U88 USB UART FTDI FT232RL SSOP28 No Digi-key Number 1 ?? 0 0
1uf cap ldo input, C9 CAP CER 1UF 50V X7R 0805 Murata GRM21BR71H105KA12L 0805 (2012 Metric) 490-4736-2-ND 2 0.25 2 0.5
atmega328p Atmel ATmega328 TQFP32 Atmel ATmega328P-AU TQFP32 No Digi-key Number 1 ?? 0 0
Power Mux Autoswitching Power Mux Texas Instruments TPS2110PWR TSSOP8 No Digi-key Number 1 ?? 0 0
LASER, TRIGGER Screw terminal block vertical, 2 pin, 5.00mm pitch Tyco Electronics 282836-2 HDR2 A98076-ND 2 0.92 2 1.84
Crystal 8MHz CRYSTAL 8.000 MHZ 8 PF SMD NDK NX3225GD-8MHZ-STD-CRA-3 SMD 644-1178-2-ND 1 0.9 1 0.9
J6 Header - 2x3 - 2.54mm - No Silkscreen Generic Headers arduino icsp No Digi-key Number 1 ?? 0 0
Reset switch Tactile SPST Switch Multicomp MC32829 PTH_SW No Digi-key Number 1 ?? 0 0
P16 MICRO USB, 2.0 TYPE B, RECETPACLE, SMT MOLEX 47346-0001 No Digi-key Number 1 ?? 0 0
LIPO S2B-PH-K-S(LF)(SN) JST Sales America Inc S2B-PH-K-S(LF)(SN) HDR2 455-1719-ND 1 0.17 1 0.17

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