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garden · by arvid · 128 clones

Greenhouse soil monitor

Four capacitive probes, one per bed, on a rechargeable 18650 cell. Readings every ten minutes. From $54 in parts.

Clone build →

Parts

  • ESP32-S3-DevKitC-1 (N8R8) C-001$19.95
  • 4 × Capacitive Soil Moisture Probe (DFRobot SEN0193) P-005$23.60
  • 18650 Li-ion Battery, 2200 mAh E-001$9.95
  • TP4056 Li-ion Charger Module E-004price pending

Parts from $53.50 (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-B5VCapacitive Soil Moisture Probe(DFRobot SEN0193)P-005 · 1 of 4 · ADC · sees 3.3–3.349 V3V33.3–3.349 V1 VCCGND2 GNDGPIO1ADC3 SIGCapacitive Soil Moisture Probe(DFRobot SEN0193)P-005 · 2 of 4 · ADC · sees 3.3–3.349 V3V33.3–3.349 V1 VCCGND2 GNDGPIO2ADC3 SIGCapacitive Soil Moisture Probe(DFRobot SEN0193)P-005 · 3 of 4 · ADC · sees 3.3–3.349 V3V33.3–3.349 V1 VCCGND2 GNDGPIO3ADC3 SIGCapacitive Soil Moisture Probe(DFRobot SEN0193)P-005 · 4 of 4 · ADC · sees 3.3–3.349 V3V33.3–3.349 V1 VCCGND2 GNDGPIO4ADC3 SIGloose ends →V+ · redGND · blackSDA · blueSCL · yellowsignal · orangeconnectors →JST PH 2.0 mmheader pinESP32-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 10 min, in the shape these channels would arrive in — not a reading from a built device.
TimeBed 1 %P-005Bed 2 %P-005Bed 3 %P-005Bed 4 %P-005
33412836
32402836
32402735
31392735
31382634
30382634