Wireless flush activation
Wireless flush activation
Bluetooth® and 868 MHz toilet flush trigger
The HEWI flush release is a universal, wireless toilet flush unit for accessible sanitary systems. It supports both Bluetooth Low Energy and a proprietary sub-GHz radio technology and can be flexibly integrated into various HEWI product variants.
«Arendi developed two complete radio electronics systems for HEWI, including firmware – from architecture and implementation to industrialization. In addition to series production approval, Arendi also provided production testing equipment, radio and EMC certifications, and delivered a production-ready solution to the customer.»
In our collaboration with Arendi, we experienced them as a very reliable and competent development partner who implemented our customer-specific electronics development professionally, in a solution-oriented manner, and to our complete satisfaction.
Ralf Andrae
Dipl.-Ing. Electrical Engineering, Digital Concept Development
In our collaboration with Arendi, we experienced them as a very reliable and competent development partner who implemented our customer-specific electronics development professionally, in a solution-oriented manner, and to our complete satisfaction.
Ralf Andrae
Dipl.-Ing. Electrical Engineering, Digital Concept Development
Initial situation, goals & challenges
HEWI was looking for a reliable development partner with extensive experience in wireless technology, low-power systems, and industrial applications. The goal was to develop a production-ready flushing trigger within approximately 12 months and to launch it into series production on schedule.
The key challenge lay in implementing a dual wireless concept using Bluetooth Low Energy and proprietary sub-GHz radio technology, while simultaneously achieving extremely low energy consumption for multi-year battery life. In addition, a tight timeline for series production and a cost-optimized bill of materials design had to be adhered to.
Project results & customer benefits
The result is two variants of a radio-tested, production-ready printed circuit board (PCB) that can be manufactured reliably and cost-effectively in larger quantities.
HEWI receives a fully developed and tested solution from a single source – including directly integrable PCBs for series production. This significantly reduces interfaces, project risks, and time-to-market.
Implemented solution
Arendi implemented a compact, energy-optimized wireless solution designed for industrial series production:
- Development of two printed circuit board variants in Altium Designer (PCBs only) with identical core architecture
- Firmware development for Bluetooth Low Energy and proprietary sub-GHz radio operation
- Deployment of a Nordic nRF54-SoC based on Zephyr for BLE communication
- Use of a Holtek sub-GHz transceiver for the proprietary radio solution
- Consistent low-power optimization for multi-year battery life
- Development and implementation of industrialization at a Swiss EMS partner
- Development of production and testing equipment
- Conducting radio and EMC approvals at a German testing laboratory
- Qualified and listed the products at Bluetooth SIG as BQC
- Delivery of a production-ready, qualified solution to HEWI
Competencies
- Bootloader
- Communication Stacks & Protocols
- Firmware architecture
- Firmware-Update over the air (FOTA)
- Hardware interfaces and drivers
- Lean Embedded Firmware
- Small to medium-sized uP systems
- Low power and battery design
- HF-Design
- Schematics & Layout
- Software-Design in C
- Wireless Technologies
Competence areas
- Embedded Systems & Firmware
- Hardware & Design
- Software & Architecture
- Wireless, IoT & Cloud
Technologies
Bluetooth Low Energy (BLE)
Zephyr RTOS
Services
- Requirements management
- Product Development
- Industrialization
- Product Life Cycle Management
- Project Management
- Bluetooth & radio approvals
- Consulting
Industry
Building Technology & Interior Construction
Customer
HEWI Heinrich Wilke GmbH
Competencies
- Bootloader
- Communication Stacks & Protocols
- Firmware architecture
- Firmware-Update over the air (FOTA)
- Hardware interfaces and drivers
- Lean Embedded Firmware
- Small to medium-sized uP systems
- Low power and battery design
- HF-Design
- Schematics & Layout
- Software-Design in C
- Wireless Technologies
Competence areas
- Embedded Systems & Firmware
- Hardware & Design
- Software & Architecture
- Wireless, IoT & Cloud
Technologies
Bluetooth Low Energy (BLE)
Zephyr RTOS
Services
- Requirements management
- Product Development
- Industrialization
- Product Life Cycle Management
- Project Management
- Bluetooth & radio approvals
- Consulting
Industry
Building Technology & Interior Construction
Customer
HEWI Heinrich Wilke GmbH
Competencies
- Bootloader
- Communication Stacks & Protocols
- Firmware architecture
- Firmware-Update over the air (FOTA)
- Hardware interfaces and drivers
- Lean Embedded Firmware
- Small to medium-sized uP systems
- Low power and battery design
- HF-Design
- Schematics & Layout
- Software-Design in C
- Wireless Technologies
Competence areas
- Embedded Systems & Firmware
- Hardware & Design
- Software & Architecture
- Wireless, IoT & Cloud
Technologies
Bluetooth Low Energy (BLE)
Zephyr RTOS
Services
- Requirements management
- Product Development
- Industrialization
- Product Life Cycle Management
- Project Management
- Bluetooth & radio approvals
- Consulting
Industry
Building Technology & Interior Construction
Customer
HEWI Heinrich Wilke GmbH