HardLabs

Bell-Boy

BBUK·Bell-Boy·kicad/Bell-Boy.kicad_pcb

Bell-Boy PCB layout, top view — open source AVR/Arduino board by BBUK

About the Bell-Boy PCB

Bell-Boy is an open source AVR/Arduino PCB design by BBUK, published on GitHub under the TAPR-OHL-1.0 license. It is a 2-layer board measuring 64 × 30 mm, with 31 components from 21 distinct parts.

Its main chip is the ATmega328P-AU, from the AVR/Arduino family. Other key parts include the MAX40200, MCP73831-2-OT and ICM-20689. By type, the board carries 10 capacitors, 8 resistors, 5 ICs, 4 connectors, 1 switch and 1 LED.

It belongs with the sensors and power & battery designs in this gallery.

From the project

Code for the "Bell-Boy" Project

This repository contains the code and hardware design for the Bell-Boy Project.

The Bell-Boy is a device used to measure how hard a person pulls on a tower bell rope. I hope it will be a useful training aid.

The core of the hardware comprises a Raspberry Pi Zero and a PCB mounted on it containing an IMU IC (an ICM20689), a ATMEGA328 with the Arduino bootloader and power management and battery charging circuitry. The Arduino manages battery charging, controls a LED and also stores device calibration data. The battery is a LiPo integral to the device and is charged via power sourced from the…

Main components on the Bell-Boy

ATmega328P-AUMAX40200MCP73831-2-OTICM-20689

Bell-Boy bill of materials (BOM)

31 components, 21 distinct parts.

QtyPartRefs
1
ATmega328P-AU
U1
2
MAX40200
U2, U4
1
MCP73831-2-OT
U3
1
ICM-20689
U5
1
Conn_01x01_Male
J1
1
Conn_01x06
J2
1
Conn_01x04
J3
1
Conn_02x16_Odd_Even
J4
1
Battery_Cell
BATT1
1
SW_DIP_x01
SW1
1
LED_Dual_2pin
LED1
1
BAT54C
D1
4
100n
C1, C2, C3, C10
3
4u7
C4, C5, C6
1
10n
C7
1
470nF
C9
1
2.2uf
C14
1
82R
R1
5
10K
R2, R4, R5, R6, R8
1
4.7k
R3
Show 1 more
QtyPartRefs
1
100K
R7

Bell-Boy design files

The KiCad project lives in the BBUK/Bell-Boy repository on GitHub; these links point at the commit this page was built from.

Bell-Boy: common questions

What microcontroller does the Bell-Boy use?

The Bell-Boy is built around the ATmega328P-AU, from the AVR/Arduino family.

How big is the Bell-Boy PCB?

The Bell-Boy measures 64 × 30 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Bell-Boy?

31 components, from 21 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bell-Boy design files?

From the BBUK/Bell-Boy repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Bell-Boy design in my own project?

Yes, under the terms of its TAPR-OHL-1.0 license, which BBUK chose for the repository.

Can I test firmware for the Bell-Boy 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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