4 layers67 × 54 mm
ESP32 SIFIVE 00
probe-rs/hive
A Raspberry PI shield for testing probe-rs against many chips & probes.
81 parts15
2 layers56 × 43 mm
Payload datalogger
CU-Rocketry/payload-dataloggerWirelessly configurable thermocouple data logging PCB implementing four MCP96RL00T on-board thermocouple to I2C converter ICs, an ESP32-C3 MCU, and flash storage.
- Size
- 56 × 43 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 55
- Nets
- 54
- Pads
- 260
- Tracks, vias
- 367, 135
- Pours
- 3
- Routed
- Yes
- KiCad
- KiCad 9.0 (file 20241229)
- Created
- 1 Apr 2025
- Updated
- 16 Jul 2025
Overview
Payload datalogger is an open-source printed circuit board by CU-Rocketry, from the CU-Rocketry/payload-datalogger repository on GitHub. It is a 2-layer board of 56 × 43 mm with 55 parts on 54 nets, routed with 367 tracks and 135 vias.
It is built around the ESP32-C3-WROOM-02-H4 and W25X40CLSNIG. Its parts include 19 resistors, 12 capacitors, 7 ICs, 4 connectors and 2 switches. It belongs with the sensors and measurement boards and the ESP32 and RISC-V boards of this library.
Main components
2
ESP32-C3-WROOM-02-H4
SMD,20x18mm-105dBm -40℃~+105℃ 2.4GHz 20.5dBm 345mA 3V~3.6V 82mA Bluetooth5.0 ESP32-C3 On-board PCB Antenna UART、SPI、I2C、I2S、USB SMD,20x18mm WiFi Modules ROHSEspressif SystemsWiFi Modules
W25X40CLSNIG
SOIC-8-150mil-40℃~+85℃ 100,000 cycles 104MHz 10uA 150ms@(64KB) 2.3V~3.6V 20 Years 4Mbit 800us SPI SOIC-8-150mil NOR FLASH ROHSWinbondNOR FLASH
README
README.mdpayload-datalogger
Wirelessly configurable thermocouple data logging PCB implementing four MCP96RL00T on-board thermocouple to I2C converter ICs, an ESP32-C3 MCU, and flash storage.
Screenshots
BOM
See [this spreadsheet].(https://docs.google.com/spreadsheets/d/12Mr7GmqM8tnob1ocJkmMWgOL1p1aouqN9iYZXRkocOg/edit?usp=sharing)
BOM cost: $65 (on DigiKey, for two boards with attrition) Does not include cables.
Additionally, batteries should be purchased elsewhere such as the suggested Amazon links to remain economical.
Firmware
Firmware source code is located in the src/payload-datalogger directory.
Source code, for ease of modification by all team members, relies on the Arduino hardware abstraction layer (HAL).
The PlatformIO IDE and toolchain is required to build and debug the firmware, meaning that the minimum prerequisites for payload datalogger firmware development are:
Parts
55| Qty | Value | Footprint | References |
|---|---|---|---|
| 11 | 10k | Resistor_SMD:R_0603_1608Metric | R3, R4, R7, R9, R11, R13, R14, R15, R16, R18, R19 |
| 7 | 1u | Capacitor_SMD:C_0603_1608Metric | C2, C3, C4, C5, C6, C7, C8 |
| 4 | 100n | Capacitor_SMD:C_0603_1608Metric | C1, C9, C12, C14 |
| 4 | MCP96RL00T-E_MX | Package_DFN_QFN:TQFN-20-1EP_5x5mm_P0.65mm_EP3.25x3.25mm | U4, U5, U6, U7 |
| 2 | 4.7k | Resistor_SMD:R_0603_1608Metric | R1, R2 |
| 2 | PTS815 | PTS815_SJM_250_SMTR_LFS:SW_Push_PTS815_SJM_250_SMTR_LFS | SW2, SW3 |
| 1 | 0 | Resistor_SMD:R_0603_1608Metric | R6 |
| 1 | 10u | Capacitor_SMD:C_0603_1608Metric | C13 |
| 1 | 2.2k | Resistor_SMD:R_0603_1608Metric | R8 |
| 1 | 2.54mm 01x02 header | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J1 |
| 1 | 270 | Resistor_SMD:R_0603_1608Metric | R20 |
| 1 | 3.7V | Connector_JST:JST_PH_B2B-PH-K_1x02_P2.00mm_Vertical | BT1 |
| 1 | 3V3 | TestPoint:TestPoint_Pad_D1.0mm | TP1 |
| 1 | 4.3k | Resistor_SMD:R_0603_1608Metric | R10 |
| 1 | 7.5k | Resistor_SMD:R_0603_1608Metric | R12 |
| 1 | B1911USD | LED_SMD:LED_0603_1608Metric | D2 |
| 1 | BU33SD5 | BUxxSD5:SSOP5_ROM | U2 |
| 1 | Conn_01x02_Pin | Connector_PinHeader_2.54mm:PinHeader_1x02_P2.54mm_Vertical | J4 |
| 1 | Conn_01x04_Pin | Connector_PinHeader_2.54mm:PinHeader_1x04_P2.54mm_Vertical | J3 |
| 1 | DE15 Socket | Connector_Dsub:DSUB-15-HD_Socket_Horizontal_P2.29x2.54mm_EdgePinOffset8.35mm_Housed_MountingHolesOffset10.89mm | J2 |
| 1 | DNP | Resistor_SMD:R_0603_1608Metric | R5 |
| 1 | ESP32-C3-WROOM-02 | RF_Module:ESP32-C3-WROOM-02 | U8 |
| 1 | GND | TestPoint:TestPoint_Pad_D1.0mm | TP2 |
| 1 | I2C_SCL | TestPoint:TestPoint_Pad_D1.0mm | TP3 |
| 1 | I2C_SDA | TestPoint:TestPoint_Pad_D1.0mm | TP4 |
| 1 | LOGO | LOGO | G*** |
| 1 | W25X40CLSN | Package_SO:SOIC-8_3.9x4.9mm_P1.27mm | U3 |
The 51 most common of 55 parts.
Questions
How big is the Payload datalogger PCB?
It measures 56 × 43 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Payload datalogger use?
55 parts, built around the ESP32-C3-WROOM-02-H4 and W25X40CLSNIG. 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 Payload datalogger KiCad files?
From the CU-Rocketry/payload-datalogger repository on GitHub, at the commit this page was made from: the board is pcb/payload-datalogger.kicad_pcb and its schematic pcb/payload-datalogger.kicad_sch. PCBKit opens the board in the browser, with nothing to install.
Can I use the Payload datalogger design in my own project?
Its repository states no licence, so its author keeps all rights: ask CU-Rocketry before reusing the design.
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