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Smart Remote-Controlled Tankless Gas Water Heater

Overview

This tankless gas water heater design enhances the user experience by utilizing two controllers—one in the kitchen and one in the bathroom. Users can remotely control both the water temperature and flow. The system includes two MCUs, a sensor, a Wi-Fi module, and a temperature and humidity sensor, offering a compact and cost-effective design.

System Benefits:

  • A single power source for the entire system enables uninterrupted long-distance control.
  • A high-accuracy temperature and humidity sensor allows precise monitoring and adjustment.
  • Separate controllers in the kitchen and bathroom provide convenient remote operation.
  • Supports both Bluetooth® Low Energy (LE) and Wi-Fi for versatile remote control options.

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4:3 ratioClock GeneratorClock GeneratorClock GeneratorSheet.1Sheet.2Sheet.3Sheet.4CN104CN104CN104Buck Regulator 1Buck RegulatorBuck RegulatorRS-485 Transceiver 1RS-485 TransceiverRS-485 TransceiverRS-485 Transceiver 2RS-485 TransceiverRS-485 TransceiverTemperature SensorTemperature SensorTemperature SensorBuck Regulator 2Buck RegulatorBuck RegulatorAUX PowerAUX PowerAUX PowerRemote ControlRemote ControlRemote ControlMain ControlMain ControlMain ControlTouch KeySheet.109Sheet.110Sheet.111Sheet.112Sheet.113Sheet.114Sheet.115Sheet.116Sheet.117Touch KeySheet.119Sheet.120Sheet.121Sheet.122Sheet.123Sheet.124Sheet.125Sheet.126Sheet.127LCD/LED Segment DisplaySheet.130Sheet.131Sheet.132Sheet.133Sheet.134Sheet.135Sheet.136Sheet.137Sheet.138Sheet.139Sheet.140Sheet.141Sheet.142Sheet.143Sheet.144Sheet.145Sheet.146Sheet.147Sheet.148Sheet.149Sheet.150Sheet.151Sheet.152Sheet.153Sheet.154Sheet.155Sheet.156Sheet.157Sheet.158Sheet.159ONONSheet.160OFFOFFSheet.161Sheet.162Sheet.163Sheet.164Sheet.165Sheet.166Sheet.167Sheet.168LCD/LED Segment Display.169Sheet.170Sheet.171Sheet.172Sheet.173Sheet.174Sheet.175Sheet.176Sheet.177Sheet.178Sheet.179Sheet.180Sheet.181Sheet.182Sheet.183Sheet.184Sheet.185Sheet.186Sheet.187Sheet.188Sheet.189Sheet.190Sheet.191Sheet.192Sheet.193Sheet.194Sheet.195Sheet.196Sheet.197Sheet.198Sheet.199ONONSheet.200OFFOFFSheet.201Sheet.202Sheet.203Sheet.204Sheet.205Sheet.206Sheet.207Sheet.208 KeyKeyKeySheet.211Sheet.212LEDLEDLEDSheet.2143.3V3.3V3.3VSheet.21612V12V12VSheet.218Sheet.219KeyKeyKeySheet.223Sheet.224 3.3V3.3V3.3VSheet.226Sheet.227Sheet.228Sheet.229Sheet.230Sheet.231Sheet.232Sheet.233 3.3V3.3V3.3V 12V12V12VSheet.240Solenoid ValveConnector ArrowConnector Arrow.714Sheet.237Sheet.241Sheet.33Sheet.49Sheet.261Sheet.262Sheet.263Sheet.264Sheet.265Sheet.266Sheet.275MOSFET x3MOSFET x3MOSFET x3Sheet.277Sheet.278 LEDLEDLEDSheet.280FanFanFanValveValveValvePumpPumpPump 12V12V12V 24/27V24/27V24/27V36V36V36VSheet.287Sheet.288Sheet.289Sheet.290Sheet.300MCU 1MCUMCUGPIOGPIOGPIOUARTUARTUARTSheet.301MCU 2MCUMCU GPIOGPIOGPIO UARTUARTUART GPIOGPIOGPIO UARTUARTUART PWMPWMPWMI2CI2CI2CWi-Fi ModuleWi-Fi ModuleWi-Fi ModuleSheet.303 3.3V3.3V3.3VFan.1000.1011Sheet.1012Sheet.1013Sheet.1014Sheet.1015Sheet.1016Sheet.1017Sheet.1018Sheet.1019Sheet.1020Sheet.1021Optional: 32KHz 12/20M XTAL ReplacementOptional: 32KHz 12/20M XTAL ReplacementOptional: 32KHz 12/20M XTAL Replacement

Clock Generator

Clock Generation

MCU

RL78 Low-Power 8 & 16-Bit MCUs

MCU

RL78 Low-Power 8 & 16-Bit MCUs

Buck Regulator

Buck Regulators (Integrated FETs)

RS-485 Transceiver

RS-485/422 with Enhanced ESD Protection

RS-485 Transceiver

RS-485/422 with Enhanced ESD Protection

Buck Regulator

Buck Regulators (Integrated FETs)

Wi-Fi Module

Wi-Fi MCUs

MOSFET

Power MOSFETs

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