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Study

LukeAndreesen·studyPCB·kicad/finalpcb_landreesen.kicad_pcb

Study PCB layout, top view — open source Microchip SAM board by LukeAndreesen
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About the Study PCB

Study is an open source Microchip SAM PCB design by LukeAndreesen, published on GitHub. It is a 2-layer board measuring 46.3 × 75 mm, with 73 components from 28 distinct parts.

Its main chip is the ATSAMD21G18A-A, from the Microchip SAM family. Other key parts include the VCNL3040, 74HC595PW-Q100,118 and TLV73333PQDBVRQ1. By type, the board carries 36 resistors, 13 capacitors, 6 ICs, 4 diodes, 3 connectors and 3 switches.

From the project

A Study Timer PCB Project - hold yourself accountable by setting the timer, attaching your phone to the detector, and sitting in front of the module. If you get up or move your phone before the timer's done, you'll deal with alarms & other consequences ...

This project is a study timer that is meant to enforce productivity; an onboard IR sensor, as well as a daughter-board hall-effect sensor module detect a user's presence and ensure their phone is sitting on the desk and not in their hands. 3 daisy-chaineed shift registers control the 7-segment displays, and a magnetic buzzer and onboard LED's provide feedback and alerts. The devce connects to the user's computer via USB for power and serial connectivity with the UI which can be interacted with using the board's buttons and potentiometer dial. This was my first independent PCB board, and I…

Study, from the project README
From the project README

Main components on the Study

VCNL304074HC595PW-Q100,118ATSAMD21G18A-ATLV73333PQDBVRQ1

Study bill of materials (BOM)

73 components, 28 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
VCNL3040
IC1
3
74HC595PW-Q100,118
IC2, IC3, IC4
1
ATSAMD21G18A-A
U1
1
TLV73333PQDBVRQ1
U2
1
Q_NPN_BCE
Q1
1
Crystal_Small
Y1
1
SWD_TAG-CONNECT
J1
1
USB4105-GF-A
J2
1
10129379-905001BLF
J4
3
157112V12700
DS1, DS2, DS3
1
CMT-8504-03-SMT-TR
LS3
3
SW_Push
SW1, SW2, SW3
1
PT01-B115D-B103
VR1
1
GREEN
D1
2
RED
D2, D3
1
D
D4
1
FB-30R
L1
4
0.1UF
0.1uF
C1, C2, C3, C4
2
22PF
22pF
C5, C6
2
1UF
1uF
C7, C8
Show 8 more
QtyPartRefs
4
100NF
100nF
C9, C12, C13, C14
1
470NF
470nF
C10
4
10K
10k
R1, R32, R33, R36
3
1k
R2, R3, R6
5
5.1K
5.1k
R4, R5, R29, R30, R31
1
180
R7
21
330
R8, R9, R10, R11, R12, R13, R14, R15 +13
2
4.7K
4.7k
R37, R38

Study design files

The KiCad project lives in the LukeAndreesen/studyPCB repository on GitHub; these links point at the commit this page was built from.

Study: common questions

What microcontroller does the Study use?

The Study is built around the ATSAMD21G18A-A, from the Microchip SAM family.

How big is the Study PCB?

The Study measures 46.3 × 75 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Study?

73 components, from 28 distinct parts, with part numbers taken from the project's own BOM. The full bill of materials is listed on this page.

Where can I download the Study design files?

From the LukeAndreesen/studyPCB repository on GitHub, which has the KiCad layout, the schematic and the BOM; the links under Design files point to each one.

Can I use the Study design in my own project?

The repository has no license, so all rights stay with LukeAndreesen. Use it as a reference, and ask the author before reusing the design.

Can I test firmware for the Study without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug Microchip SAM firmware against it before you order a PCB.

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