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PCB — ARM Cortex-M4
Main PCB Assembly
ProcessorARM Cortex-M4F @ 64MHz
BoardFR4 4-layer, ENIG finish
Diameter28mm circular
Thickness1.6mm (3mm w/ components)
ADC12-bit SAR, 1MSPS
Flash / RAM512KB / 128KB
Power MgmtTPS62743 DC-DC (90% eff.)
Sleep Draw<5μA deep sleep
Nordic nRF52833 →
WiFi — ESP32-C3
WiFi / BLE Module
ChipsetEspressif ESP32-C3
CoreRISC-V single-core @ 160MHz
WiFi802.11b/g/n 2.4GHz
BLEBluetooth 5.0 LE
TX Power+21dBm (max)
SecurityWPA3, hardware crypto
OTASecure firmware updates
AntennaPCB trace via shared strip
Espressif ESP32-C3 →
Zigbee — CC2652R
Zigbee 3.0 Radio
ChipsetTI CC2652R
CoreARM Cortex-M4F @ 48MHz
ProtocolIEEE 802.15.4 mesh
TX Power+5dBm
Range~100m open air
Mesh NodesUp to 250 devices
IntegrationsHomeAssistant, Hubitat
Sensor RelayMulti-hop leak alerts
Texas Instruments CC2652R →
CR123A — 3V 1500mAh (×2)
Dual Lithium Batteries
TypeCR123A Lithium
Voltage3.0V nominal
Capacity1500mAh each
Quantity2 (parallel redundancy)
Life3+ years typical
Temp Range-20°C to +60°C
Self-Discharge<1% per year
AvailabilityStandard, globally sourced
Panasonic CR123A →
Antenna — Dual-band Strip
PCB Trace Antenna
TypeMeandered inverted-F
Bands2.4GHz (WiFi + Zigbee)
Gain2.1 dBi peak
PatternOmnidirectional
Impedance50Ω matched
IntegrationPCB trace, no ext. antenna
ClearanceTuned for under-sink installs
TI Antenna Design Guide →
AquaSentinel Sensor
Smart water leak detection with dual-sensor redundancy. Two-piece screw-mount design — dome module threads into base ring for easy installation and maintenance.
Design Variant
Internal Components
Water Contact Sensors x2
Dual gold-plated contact probes (dia 2.5mm) protruding 8mm from dome base. Detects water within 3 seconds. Touch the mounting surface when installed.
Main PCB x1
ARM Cortex-M4 on circular PCB (dia 28mm × 3mm). ADC for moisture sensing, OTA firmware updates, and power management IC.
WiFi Module x1
ESP32-C3 WiFi 4 (802.11n) + BLE 5.0. Cloud connectivity for alerts, remote monitoring, and OTA updates.
Zigbee Radio x1
IEEE 802.15.4 mesh networking. Sensor-to-sensor communication and smart home integration (HomeAssistant, Hubitat).
CR123A Batteries x2
Dual lithium cells (dia 17mm × 34mm each) for 3+ year lifespan. Low-power sleep mode draws <5μA. Battery level reported to app.
PCB Antenna x1
Integrated dual-band antenna for WiFi + Zigbee. Tuned for under-sink installations with limited clearance.
Specifications
Dimensions68mm dia × 38mm (dome) + 72mm base ring
Weight85g (with batteries)
MaterialABS/PC blend, IP67 rated
FinishSoft-touch matte
Mounting3-screw base ring + threaded dome
ConnectivityWiFi 4 + Zigbee 3.0 + BLE 5.0
Detection Time<3 seconds
Battery Life3+ years (2x CR123A)
Operating Temp0°C to 50°C
CertificationsWaterMark, CE, FCC, RCM
Installation
1. Screw base ring to surface with 3 mounting screws
2. Screw sensor dome into base (2-3 full turns)
3. Pair via app (BLE auto-discovery)
4. To clean: unscrew dome, wipe sensors, re-attach