HardLabs

MicroMETER

AUXSPACEeV·microMETER·3_Elektronik/KiCad/Main_PCB.kicad_pcb

MicroMETER PCB layout, top view — open source ESP32 board by AUXSPACEeV

About the MicroMETER PCB

MicroMETER is an open source ESP32 PCB design by AUXSPACEeV, published on GitHub under the CERN-OHL-P-2.0 license. It is a 4-layer board measuring 32 × 66 mm, with 82 components from 34 distinct parts.

Its main chip is the ESP32-S3-WROOM-1, from the ESP32 family. Other key parts include the TCAN334, TPS7B8601QDDARQ1, LSM6DSO32XTR and BMP581. By type, the board carries 32 resistors, 23 capacitors, 8 transistors, 6 connectors, 5 ICs and 5 diodes.

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

From the project

Minimal Flightcomputer

Barometer BMP581 for altitude computation IMU STM LSM6DS032x for acceloration and rotation data Buzzer for easier commissioning and recovery 2-channel Pyro ignition for recovery CAN Bus for communication with posible expansion PCBs µSD-Card for logging remove before flight jumper GPIO38 is pulled HIGH when the jumper is removed battery voltage measurement

µMETER provides two separated Pyro Channels. To prevent voltage drops from the ignition the battery is decoupled via two 680µF capacitors. The capacitors are charging/discharging when the ARM-Signal is enabled/disabled for about 2.8 sec. To…

MicroMETER, from the project README
From the project README

Main components on the MicroMETER

TCAN334TPS7B8601QDDARQ1LSM6DSO32XTRESP32-S3-WROOM-1BMP581

MicroMETER bill of materials (BOM)

82 components, 34 distinct parts — part numbers from the project's BOM.

QtyPartRefs
1
TCAN334
U1
1
TPS7B8601QDDARQ1
U2
1
LSM6DSO32XTR
U3
1
ESP32-S3-WROOM-1
U4
1
BMP581
U8
5
2N7002K
Q1, Q4, Q5, Q6, Q8
3
DMP3099L
Q2, Q3, Q7
1
693072010801
Wurth Elektronik
J1
1
61300311121
PinHeader 2,54mm 3p
J2
2
JST XH 3p
J3, J4
1
691210910004
Wurth Elektronik
J5
1
629722000214
USB_C_Plug_USB2.0
Wurth Elektronik
P1
1
61300211121
PinHeader 2,54mm 2p
JP1
2
430481025816
Wurth Elektronik
SW2, SW3
3
865060143005
grün
D1, D2, D3
1
SS24FL
D4
1
SS24FL
D5
13
885012206071
100nF
C1, C3, C4, C5, C6, C8, C9, C11 +5
1
865060243005
150 µF
Wurth Elektronik
C2
3
885012106031
10µF
C7, C15, C26
Show 14 more
QtyPartRefs
2
885012206076
1µF
C10, C17
2
885012206065
10nF
C19, C20
2
870025375009
680µF
C23, C24
2
62R
R1, R17
15
4,7k
R2, R7, R8, R9, R10, R11, R16, R19 +7
1
30K
8,2k
R3
2
11K
11k
R4, R15
1
51K
4,7k
R5
1
2,7k
R6
2
330R
R12, R18
3
390R
R13, R14, R23
2
22R
R27, R28
2
5,1k
R29, R30
1
8,2k
R31

MicroMETER design files

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

MicroMETER: common questions

What microcontroller does the MicroMETER use?

The MicroMETER is built around the ESP32-S3-WROOM-1, from the ESP32 family.

How big is the MicroMETER PCB?

The MicroMETER measures 32 × 66 mm, has 4 copper layers and is 1.579 mm thick.

How many components are on the MicroMETER?

82 components, from 34 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 MicroMETER design files?

From the AUXSPACEeV/microMETER 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 MicroMETER design in my own project?

Yes, under the terms of its CERN-OHL-P-2.0 license, which AUXSPACEeV chose for the repository.

Can I test firmware for the MicroMETER without the hardware?

Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP32 firmware against it before you order a PCB.

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