Cactus
About the Cactus PCB
Cactus is an open source ESP8266 PCB design by hutscape, published on GitHub under the MIT license. It is a 2-layer board measuring 76.5 × 38.1 mm, with 20 components from 11 distinct parts.
Its main chip is the WeMos_Battery_Shield, from the ESP8266 family. Other key parts include the WeMos_D1_mini, 74HC595S16-13 and Si7021_breakout. By type, the board carries 9 resistors, 5 diodes, 4 ICs, 1 switch and 1 capacitor.
It belongs with the sensors and iot & wireless designs in this gallery.
From the project
🌵 Indoor WiFi-connected temperature and humidity sensor 🍶
Visit hutscape.com/cactus for more details.
Main components on the Cactus
Cactus bill of materials (BOM)
20 components, 11 distinct parts — part numbers from the project's BOM.
| Qty | Part | Footprint | Refs |
|---|---|---|---|
| 1 | WeMos_Battery_Shield | Battery_shield | U1 |
| 1 | WeMos_D1_mini | D1_mini_board | U2 |
| 1 | 74HC595S16-13 74HC595 DiodesZetex | SOIC-16_3.9x9.9mm_P1.27mm | U3 |
| 1 | Si7021_breakout | Si7021_breakout_board | U4 |
| 1 | SW_Push | Tactile_pushbutton | SW1 |
| 5 | 150080RS75000 LED Wurth Electronics | LED_0805_2012Metric_Pad1.15x1.40mm_HandSolder | D1, D2, D3, D4, D5 |
| 1 | LMK212ABJ106KGHT 10u Taiyo Yuden | C_0805_2012Metric_Pad1.15x1.40mm_HandSolder | C1 |
| 6 | 1k | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R1, R2, R3, R4, R5, R7 |
| 1 | CRCW0805470RFKEAC 470 Vishay | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R6 |
| 1 | CRCW080510K0FKEAC 10k Vishay | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R8 |
| 1 | 0OHM 0ohm | R_0805_2012Metric_Pad1.15x1.40mm_HandSolder | R9 |
Cactus design files
The KiCad project lives in the hutscape/cactus repository on GitHub; these links point at the commit this page was built from.
- Layoutpcb/cactus.kicad_pcb
- Schematicpcb/cactus.kicad_sch
- BOM_data/bill_of_materials.csv
Cactus: common questions
What microcontroller does the Cactus use?
The Cactus is built around the WeMos_Battery_Shield, from the ESP8266 family.
How big is the Cactus PCB?
The Cactus measures 76.5 × 38.1 mm, has 2 copper layers and is 1.6 mm thick.
How many components are on the Cactus?
20 components, from 11 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 Cactus design files?
From the hutscape/cactus 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 Cactus design in my own project?
Yes, under the terms of its MIT license, which hutscape chose for the repository.
Can I test firmware for the Cactus without the hardware?
Yes. HardLabs builds a simulation of the board from its netlist and BOM, so you can run and debug ESP8266 firmware against it before you order a PCB.
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