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MIT

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hand wash timer (digital logic)

3 months ago 27
  • Description
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Description

This is a little timer you can put next to your sink in the kitchen or bathroom. When you wash your hands, wave your hand in front of the IR detector, and it will count down 20 seconds to make sure you wash your hands for long enough. Stay safe and healthy!

Documents

Schematic

PCB

BOM

ID Name Designator Footprint Quantity
1 CD40192BE U6,U2 DIP-16_L19.2-W6.6-P2.54-LS7.6-BL 2
2 USB4085-GF-A USB1 USB4085-GF-A 1
3 NE555P U1 DIP-8_L9.8-W6.6-P2.54-LS7.6-BL 1
4 8.3uF C1 RAD-0.2 1
5 10nF C2 RAD-0.2 1
6 8-10u C3 RAD-0.2 1
7 NAR141SH LED1,LED2 LED-SEG-TH_10P-L10.0-W12.9-P2.54-S7.52-TL 2
8 IRF510PBF Q5 TO-220-3_L10.0-W4.5-P2.54-T 1
9 2N3904(TO-92) Q2,Q3,Q4 TO-92-3_L5.1-W4.1-P1.27-L 3
10 LED-TH-5mm_IR LED3 LED-TH_BD5.0_RED 1
11 PT-TH-5mm_IR PT1 LED-TH_BD5.0_RED 1
12 IRF9540NPBF Q1 TO-220-3_L10.0-W4.5-P2.54-L 1
13 SN74LS247N U5,U3 DIP-16_L19.2-W6.6-P2.54-LS7.6-BL 2
14 1k R17,R18,R19,R20,R21,R23,R24,R25,R26,R27,R28,R29,R30 R_AXIAL-0.4 13
15 150 R33 R_AXIAL-0.4 1
16 100k R2,R3 R_AXIAL-0.4 2
17 10k R4,R5,R11,R12 R_AXIAL-0.4 4
18 4.7k R6 R_AXIAL-0.4 1
19 220 R7 R_AXIAL-0.4 1
20 68k R8 R_AXIAL-0.4 1
21 33k R9 R_AXIAL-0.4 1
22 10k OR 15k R10 R_AXIAL-0.4 1
23 5.1k R1,R13 R_AXIAL-0.4 2
24 1N4148 D1 DO-35_BD2.0-L4.0-P8.00-D0.5-FD 1

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