2 layers76 × 92.5 mm
Pcb gateway
mirra-org/mirra
Firmware, web app/server and documentation for the MIRRA project.
86 partsApache-2.0
2 layers93 × 93 mm
Sensor node
mirra-org/mirraFirmware, web app/server and documentation for the MIRRA project.
- Size
- 93 × 93 mm
- Copper layers
- 2
- Thickness
- 0.8 mm
- Parts
- 58
- Nets
- 84
- Pads
- 259
- Tracks, vias
- 726, 164
- Pours
- 5
- Routed
- Yes
- KiCad
- KiCad 7 (file 20221018)
- Created
- 5 Nov 2024
- Updated
- 2 Jun 2025
Overview
Sensor node is an open-source printed circuit board by mirra-org, from the mirra-org/mirra repository on GitHub, published under the Apache-2.0 licence. It is a 2-layer board of 93 × 93 mm with 58 parts on 84 nets, routed with 726 tracks and 164 vias.
It is built around the ESP32-WROOM-32, RF-LORA-868-SO and FT232RL, with the PCF2129T/2 among its other parts. Its parts include 14 resistors, 13 capacitors, 7 ICs, 4 diodes and 4 connectors. It belongs with the home automation and IoT and sensors and measurement boards and the ESP32 boards of this library.
Main components
4
ESP32-WROOM-32
SMD,18x25.5mm-40℃~+85℃ -98dBm 2.4GHz 2.7V~3.6V 20dBm Bluetooth4.2 ESP32-DOWDQ6 UART、SDIO、SPI、I2C、GPIO、PWM、ADC、DAC SMD,25.5x18mm WiFi Modules ROHSEspressif SystemsWiFi ModulesRF-LORA-868-SO
-LoRa ModulesRF Solutions
FT232RL
SSOP-28-208mil-40℃~+85℃ 3.3V~5.25V、4V~5.25V USB 2.0 USB to UART SSOP-28-208mil USB Converters ROHSFTDIUSB Converters
PCF2129T/2
SO-16-300mil-40℃~+85℃ 0.7uA 1.8V~4.2V 700nA Built-in SPI、I2C Watchdog timer、Temperature compensation、Backup power management and battery charging、Battery low-voltage detection、Timestamp function、Programmable clock output、Alarm function、Built-in crystal oscillator、Locking and tamper-proof、Periodic interrupt output Yes SO-16-300mil Real Time Clocks ROHSNXP SemiconductorsReal-Time Clocks (RTC)
README
README.mdMIRRA
Microclimate Instrument for Real-time Remote Applications
⚠️ This is a research project. Limited testing has been performed and reliability of data storage/sensor readout is not guaranteed. Use with caution. ⚠️
3D Designs
The radiation is 3D printed and designed using OpenSCAD. All design files can eb found in 3d_printing. They can be printed using an extrusion printer, with minimal post-processign (no supports).
PCB designs
All PCBs are designed with KiCAD and located in the pcb_boards directory. Components also contain ordering codes for Mouser and/or Farnell, such that the design is completely rebuilable.
Embedded Code
The software for the sensor node and gateway are located in the firmware folder. The easiest way to build and upload the code is using PlaformIO.
Server / web-interface
Use docker-compose to start the webserver and related components (such as MQTT server, graphena...) from the webserver folder. Some services are password protected, the passwords are (for now) also included in the docker-compose file.
Licence
Apache-2.0 License, see LICENSE file.
Parts
58| Qty | Value | Footprint | References |
|---|---|---|---|
| 7 | 10k | Resistor_SMD:R_0603_1608Metric | R1, R2, R4, R5, R8, R14, R15 |
| 6 | 100nF | Capacitor_SMD:C_0603_1608Metric | C1, C4, C5, C7, C9, C10 |
| 4 | MountingHole | MountingHole:MountingHole_3.2mm_M3 | H1, H2, H3, H4 |
| 3 | 10uF | Capacitor_SMD:C_1206_3216Metric | C13, C14, C17 |
| 3 | 750R | Resistor_SMD:R_0603_1608Metric | R6, R7, R16 |
| 3 | Fiducial | Fiducial:Fiducial_1mm_Mask2mm | FID1, FID2, FID3 |
| 3 | LED | LED_SMD:LED_0603_1608Metric | D1, D2, D4 |
| 2 | 22uF | Capacitor_SMD:C_1206_3216Metric | C16, C18 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R10, R12 |
| 2 | 6.8µF | Capacitor_SMD:C_1206_3216Metric | C6, C11 |
| 2 | SiP32431 | Package_TO_SOT_SMD:SOT-363_SC-70-6 | U1, U8 |
| 1 | 10M | Resistor_SMD:R_0603_1608Metric | R9 |
| 1 | 2.2uH | gems_footprints:L_L4mm_D4mm_H1.8mm | L1 |
| 1 | 330R | Resistor_SMD:R_0603_1608Metric | R3 |
| 1 | Antenna | Connector_PinHeader_2.54mm:PinHeader_1x01_P2.54mm_Vertical | AE1 |
| 1 | BOOT | Button_Switch_SMD:SW_SPST_KMR2 | IO4 |
| 1 | Battery_Cell | Connector_JST:JST_EH_B02B-EH-A_1x02_P2.50mm_Vertical | BT2 |
| 1 | Battery_Cell | gems_footprints:Renata_Battery_Holder_SMTM1125 | BT1 |
| 1 | Battery_Cell | gems_footprints:Eagle_Battery_Holder_A_12BH311P-GR | BT3 |
| 1 | Conn_02x03_Odd_Even | Connector_PinHeader_2.54mm:PinHeader_2x03_P2.54mm_Vertical | J2 |
| 1 | D_Schottky | Diode_SMD:D_SMB | D3 |
| 1 | ESP32-WROOM-32 | RF_Module:ESP32-WROOM-32 | U2 |
| 1 | FT232RL | Package_SO:SSOP-28_5.3x10.2mm_P0.65mm | U4 |
| 1 | Ferrite_Bead | Inductor_SMD:L_0805_2012Metric_Pad1.15x1.40mm_HandSolder | FB1 |
| 1 | Jumper_3_Open | Connector_PinHeader_2.54mm:PinHeader_1x03_P2.54mm_Vertical | JP2 |
| 1 | PCF2129T | gems_footprints:SO16 | IC1 |
| 1 | RESET | Button_Switch_SMD:SW_SPST_KMR2 | RESET1 |
| 1 | RF-LORA-868-SO | gems_footprints:RF-LORA-868-SMT | U3 |
| 1 | RP604x | gems_footprints:DFN_12_Pin_2.7x3mm_P0.5mm | U7 |
| 1 | Screw_Terminal_01x12 | gems_footprints:TerminalBlock_Phoenix_PTSA-1,2-2-3,5-F-THR-1x12-P3.50mm_45Degree | J4 |
| 1 | Screw_Terminal_01x15 | gems_footprints:TerminalBlock_Phoenix_PTSA-1,2-2-3,5-F-THR-1x15-P3.50mm_45Degree | J1 |
| 1 | USB_B_Micro | Connector_USB:USB_Micro-B_Molex-105133-0001 | J3 |
Questions
How big is the Sensor node PCB?
It measures 93 × 93 mm and has 2 copper layers, 0.8 mm thick.
What parts does the Sensor node use?
58 parts, built around the ESP32-WROOM-32, RF-LORA-868-SO, FT232RL and PCF2129T/2. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Sensor node KiCad files?
From the mirra-org/mirra repository on GitHub, at the commit this page was made from: the board is pcb_boards/sensor_node/sensor_node.kicad_pcb and its schematic pcb_boards/radiation_shield/radiation_shield.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Sensor node design in my own project?
Its repository publishes it under the Apache-2.0 licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).
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