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Orchid light + humidity

Light, humidity and temperature on the windowsill, so you know when the orchids need shade or misting. From $49 in parts.

Clone build →

Parts

  • ESP32-S3-DevKitC-1 (N8R8) C-001$19.95
  • BME280 Temperature, Humidity and Pressure Sensor P-001$14.95
  • BH1750 Ambient Light Sensor V-005$4.50
  • 18650 Li-ion Battery, 2200 mAh E-001$9.95
  • TP4056 Li-ion Charger Module E-004price pending

Parts from $49.35 (1 not priced yet) · powered by the 18650 Li-ion Battery, 2200 mAh

Wiring

The volts are the parts' own: the 18650 Li-ion Battery, 2200 mAh puts out 2.5–4.2 V, and the ESP32-S3-DevKitC-1 (N8R8)'s regulator makes the 3.251–3.349 V rail its GPIO and most of the sensors run from. Which header pin each lead lands on is our suggestion — the registry has no pin map, and nothing here has been wired on a bench.

Power the board off while you plug anything in. Every connector here is keyed: if it doesn't click in easily, turn it over rather than forcing it.

18650 Li-ion Battery, 2200mAhE-001 · out 2.5–4.2 VJST PH 2.0 mm, 2-pin2200 mAh · ≤1000 mATP4056 Li-ion Charger ModuleE-004 · charges at 4.137–4.263 VJST PH 2.0 mm, 2-pin2.5–4.2 V5v-pinESP32-S3-DevKitC-1 (N8R8)C-001 · in 3.68–5.5 V3V3 rail 3.251–3.349 V · ≤800 mAGPIO logic 3.3 V · USB Micro-B5VBME280 Temperature, Humidity andPressure SensorP-001 · I²C 0x77 · sees 3.251–3.349 VGND1 GND3V33.251–3.349 V2 VCCGPIO8I²C 0x773 SDAGPIO9I²C 0x774 SCLBH1750 Ambient Light SensorV-005 · I²C 0x23 · sees 3.251–3.349 V1 GND2 VCC3 SDA4 SCLV-005 → P-001JST SH 1.0 mm, 4-pin · either portloose ends →V+ · redGND · blackSDA · blueSCL · yellowsignal · orangeconnectors →JST PH 2.0 mmJST SH 1.0 mm · QTheader pinI²C 0x77 P-001 · 0x23 V-005 — no conflictsESP32-S3-DevKitC-1 (N8R8) GPIO are 3.3 V only — do not wire a signal to the 5V rail.

Readings

What this build sends: one column per channel its parts read or drive, with the unit the capability carries. The values and times below are sample data.

Sample data, one row every 5 min, in the shape these channels would arrive in — not a reading from a built device.
TimeLight lxV-005Humidity %P-001Temp °CP-001
2405821.4
2655921.5
3126121.6
4206221.8
5056221.9
5616322.0