HardLabs

Bluegrass

agrif·bluegrass·hardware/stm32-battery.kicad_pcb

Bluegrass PCB layout, top view — open source STM32 board by agrif

About the Bluegrass PCB

Bluegrass is an open source STM32 PCB design by agrif, published on GitHub under the CC-BY-SA-4.0 license. It is a 4-layer board measuring 61 × 88.9 mm, with 107 components from 65 distinct parts.

Its main chip is the STM32F103CBT6, from the STM32 family. Other key parts include the SMF05CT1G, USBLC6-2SC6, TPS63020DSJR, BQ24074RGT and MAX17048G+. By type, the board carries 34 resistors, 29 capacitors, 10 test points, 8 connectors, 8 jumpers and 7 ICs.

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

From the project

an STM32 board with on-board battery charging

This is an STM32 board (a la "Blue Pill") with built-in circuitry to charge a single-cell lithium battery, over USB or DC input. It provides 5V and 3.3V both at 1A, low standby current, battery fuel gauging, and supports charging from a solar panel.

Main components on the Bluegrass

STM32F103CBT6SMF05CT1GUSBLC6-2SC6TPS63020DSJRBQ24074RGTMAX17048G+

Bluegrass bill of materials (BOM)

107 components, 65 distinct parts.

QtyPartRefs
1
STM32F103CBT6
U1
1
SMF05CT1G
U2
1
USBLC6-2SC6
U3
2
TPS63020DSJR
U4, U6
1
BQ24074RGT
U5
1
MAX17048G+
U7
1
16MHz
Y1
1
32.768kHz
Y2
1
SWD
J1
1
Left
J2
1
Right
J3
1
Stemma I2C
J4
1
Micro SD
J5
1
USB-C
J6
1
DC In
J7
1
BATT
J8
1
BOOT0
JP1
1
ITERM
JP2
1
TMR
JP3
1
TS
JP4
Show 45 more
QtyPartRefs
1
1.5A
JP5
1
1A
JP6
1
0.5A
JP7
1
FUEL
JP8
1
Reset
SW1
1
VBUS
TP1
1
+3.3V
TP2
1
VDC
TP3
1
+4V
TP4
1
+3.3V/PG
TP5
1
+BATT
TP6
1
GND
TP7
1
+5V
TP8
1
+5V/PG
TP9
1
~{ALRT}
TP10
1
USR
D1
2
SS54
D2, D3
1
CHG
D4
1
PWR
D5
1
600Ω @ 100MHz
FB1
2
1µH
L1, L2
1
10nF
C1
11
100nF
C2, C5, C6, C7, C8, C9, C14, C15 +3
7
10µF
C3, C18, C19, C20, C25, C26, C27
2
1µF
C4, C16
2
10pF
C10, C11
2
6pF
C12, C13
2
22µF
C17, C24
2
4.7µF
C22, C23
10
10k
R1, R2, R8, R9, R10, R11, R12, R20 +2
1
300
R3
1
0
R4
2
4.7k
R5, R6
2
1.5k
R7, R16
1
33k
R13
2
5.1k
R14, R15
1
82k
R17
3
1M
R18, R19, R32
2
180k
R22, R34
1
270
R24
4
1k
R25, R28, R29, R30
1
2k
R26
1
330
R27
1
1.5M
R31
1
100k
R33

Bluegrass design files

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

Bluegrass: common questions

What microcontroller does the Bluegrass use?

The Bluegrass is built around the STM32F103CBT6, from the STM32 family.

How big is the Bluegrass PCB?

The Bluegrass measures 61 × 88.9 mm, has 4 copper layers and is 1.6116 mm thick.

How many components are on the Bluegrass?

107 components, from 65 distinct parts. The full bill of materials is listed on this page.

Where can I download the Bluegrass design files?

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

Can I use the Bluegrass design in my own project?

Yes, under the terms of its CC-BY-SA-4.0 license, which agrif chose for the repository.

Can I test firmware for the Bluegrass without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug STM32 firmware against it before you order a PCB.

Similar boards