HardLabs

CPRPal

Will946·CPRPal·PCB/EE496.kicad_pcb

CPRPal PCB layout, top view — open source AVR/Arduino board by Will946

About the CPRPal PCB

CPRPal is an open source AVR/Arduino PCB design by Will946, published on GitHub under the MIT license. It is a 2-layer board measuring 78.8 × 71.9 mm, with 41 components from 24 distinct parts.

Its main chip is the Arduino_Nano_ESP32, from the AVR/Arduino family. Other key parts include the TPS63070, LM66200DRLR and SN74AHCT125N. By type, the board carries 14 connectors, 11 capacitors, 9 resistors, 3 ICs, 1 module and 1 diode.

It belongs with the sensors and displays & leds designs in this gallery.

From the project

Chest compressions are hard to gauge mid-panic. This device measures force, rate, and posture in real time so you don't have to guess.

- Project Overview - Repository Structure - System Architecture - Hardware Components - Wiring and Pin Assignments - PCB Design - Firmware - Operating Modes - User Operation - Signal Processing - Power System - Cloud and Web Application - Setup and Installation - Library Dependencies

CPRPal is a portable, puck-shaped CPR coaching device designed to help untrained bystanders and CPR trainees perform chest compressions with correct force, rhythm, and body positioning during a cardiac emergency or training session.

CPRPal, from the project README
From the project README

Main components on the CPRPal

TPS63070LM66200DRLRSN74AHCT125NArduino_Nano_ESP32

CPRPal bill of materials (BOM)

41 components, 24 distinct parts.

QtyPartRefs
1
TPS63070
U1
1
LM66200DRLR
U2
1
SN74AHCT125N
U3
1
Arduino_Nano_ESP32
A1
2
Conn_01x02_Pin
J1, J2
2
Conn_01x03_Pin
J3, J4
1
Conn_01x05_Pin
J5
4
Conn_02x05_Odd_Even
J6, J9, J13, J14
1
Conn_02x04_Odd_Even
J7
1
Conn_02x06_Odd_Even
J8
2
Conn_01x15_Pin
J10, J11
1
Conn_02x08_Odd_Even
J12
1
VAL**
mouse-bite-2mm-4mm
1
RED
D1
1
1.5uH
L1
2
0.1uF
C1, C4
4
10uF
C2, C3, C5, C9
3
22uF
C6, C7, C8
2
100nF
C10, C11
3
10K
R1, R7, R10
Show 4 more
QtyPartRefs
1
68.1k
R2
1
50k
R3
1
365k
R4
3
1k
R5, R6, R8

CPRPal design files

The KiCad project lives in the Will946/CPRPal repository on GitHub; these links point at the commit this page was built from.

CPRPal: common questions

What microcontroller does the CPRPal use?

The CPRPal is built around the Arduino_Nano_ESP32, from the AVR/Arduino family.

How big is the CPRPal PCB?

The CPRPal measures 78.8 × 71.9 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the CPRPal?

41 components, from 24 distinct parts. The full bill of materials is listed on this page.

Where can I download the CPRPal design files?

From the Will946/CPRPal repository on GitHub, which has the KiCad layout and the schematic; the links under Design files point to each one.

Can I use the CPRPal design in my own project?

Yes, under the terms of its MIT license, which Will946 chose for the repository.

Can I test firmware for the CPRPal without the hardware?

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

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