Cactus

🌵 An indoor WiFi-connected temperature and humidity sensor 🍶

power LiPO

wireless WiFi

sensor Humidity

mcu ESP8266

battery life 1 month

bom items 36

bom cost USD $26.92

vendors 5

completed May 2019

Why "Cactus"?

Named after the cactus, a plant known for thriving in extreme climates while conserving moisture—perfect for a device monitoring environmental conditions indoors.

Mechanical sizes

Item	Height	Width	Depth	Weight
Name card holder box enclosure	`90 mm`	`55 mm`	`25 mm`
PCB	`76 mm`	`38 mm`	`2 mm`
WeMos D1 Mini V3.0.0 pcb fit	`34.2 mm`	`25.6 mm`	`2 mm`	`3 g`
WeMos Battery shield pcb fit	`34.2 mm`	`25.6 mm`	`2 mm`
Adafruit Si7021 Breakout Board pcb fit	`17.8 mm`	`15.3 mm`	`3 mm`	`1 g`
`500mAh` LiPo pcb fit	`36 mm`	`29 mm`	`4.75 mm`	`10.5 g`
`500mAh` LiPo pcb fit	`43 mm`	`25 mm`	`8 mm`
`2000mAh` LiPo pcb fit	`60 mm`	`36 mm`	`7 mm`	`34 g`
`2000mAh` LiPo	`80 mm`	`70 mm`	`4 mm`
`2500mAh` LiPo	`65 mm`	`51 mm`	`8 mm`	`52 g`

State Machine

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