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Compatible hardware

The hardware below works with AquasManager. Each item has a level:

Level Meaning
✅ Tested In service on a real installation
☑️ Supported Handled by the firmware and the interface, no real-world feedback yet
🧪 Planned On the roadmap, not usable yet

The list grows with your feedback: hardware that works for you (or doesn’t) can be reported in the GitHub Discussions.

Controller

Section titled “Controller”
Hardware Level Notes
ESP32 DevKit (ESP32-WROOM-32, 30 or 38 pins) ✅ Tested The only board the firmware targets (esp32dev): see ESP32 board and relays
ESP32-S2, S3, C3, C6 — Not supported for now

Relay control

Section titled “Relay control”
Hardware Level Notes
1 to 8-channel optocoupler relay modules (5 V) ☑️ Supported Active-high or active-low control, set per relay
ULN2803A + coil relays (or interface relays) ☑️ Supported See the wiring below; logic not inverted
6 mm DIN-rail interface relays (41F-1Z-C2-1 type, 6 to 24 V coil) ☑️ Supported With a ULN2803A and a 12 or 24 V supply

Wiring a ULN2803A

Section titled “Wiring a ULN2803A”

The ULN2803A holds 8 low-side switches, driven directly by the ESP32’s 3.3 V outputs. An output set high connects the ULN output to ground: current flows through the relay coil.

 +12 V (or 24 V) ──┬──► A1 (+) of each relay
                   └──► ULN pin 10 (COM: flyback diodes)


 ESP32 GPIO ──► 1B (pin 1)      1C (pin 18) ──► A2 (−) of relay 1
                2B (pin 2)      2C (pin 17) ──► A2 (−) of relay 2   … up to 8B / 8C


 Supply GND ──┬──► ULN pin 9 (GND)
              └──► ESP32 GND (common ground required)
  • A 12 or 24 V supply for the coils (5 V is below the minimum of 6-24 V relays).
  • 500 mA per output and 2.5 A in total: plenty for relays (about 16 mA each at 12 V).
  • In AquasManager, leave “Invert relay logic” (Inverser la logique du relais) off.
  • A ready-made relay module (with optocoupler and IN1, IN2… terminals) doesn’t need a ULN2803A.

I/O expanders (I²C)

Section titled “I/O expanders (I²C)”
Hardware Level Notes
PCF8574 (8 I/O) ✅ Tested Several modules at different addresses (0x20 to 0x27)
PCF8575 (16 I/O) ☑️ Supported
PCA9685 (16 PWM outputs) ✅ Tested Lighting channels, address 0x40 by default

Details and addresses: Modules and RTC clock.

Probes and sensors

Section titled “Probes and sensors”
Hardware Level Notes
Waterproof DS18B20 temperature probe (1-Wire) ✅ Tested Several probes on one bus, 4.7 kΩ resistor
Float switch (reed switch) ✅ Tested High or low level, ATO, RO water reserve
Infrared optical level sensor (on/off output) ✅ Tested No moving parts, doesn’t stick with limescale; wired and set up like a float switch
Analogue sensor on an ADC input ☑️ Supported Prefer ADC1 (GPIO32 to 39)
pH and redox (ORP) probes 🧪 Planned

Wiring: Probes and sensors.

RTC clock

Section titled “RTC clock”
Hardware Level Notes
DS3231 ☑️ Supported The most accurate; keeps lighting time without a network
DS1307, PCF8563, PCF85063 ☑️ Supported

Lighting

Section titled “Lighting”
Hardware Level Notes
ESP32 PWM outputs ☑️ Supported For a few channels
PCA9685 ✅ Tested Up to 16 channels per module
Meanwell ELG-B, HLG-B dimmable drivers (10 V DIM) ☑️ Supported Through an optocoupler (PC817), inverted PWM: see LED fixtures

Cameras

Section titled “Cameras”
Hardware Level Notes
Reolink and Tapo cameras, RTSP cameras ☑️ Supported Read on your network, no cloud: see Cameras