All work
Smart metering · Zephyr
PEM431 smart electricity meter
Production firmware for a panel-mount power quality meter on the nRF54L15: it reads the meter over Modbus RTU, reports over LoRaWAN, and offers Bluetooth LE diagnostics and remote updates.
- Client
- YOBIIQ B.V.
- Role
- Embedded Software & IoT Consultant
- Period
- 2023 - Present
What I built
- Modbus RTU client with configurable register mapping and scaling
- Max-demand tracking that logs and reports peak values over LoRaWAN
- Bluetooth LE diagnostics for installers
- Signed firmware images installed by MCUboot
- Remote updates over LoRaWAN FUOTA (multicast) or BLE DFU
The device
Panel-mount power quality meter (96 x 96 x 81 mm, IP30) with a touch-button LCD, an auxiliary 230 V supply and current transformer inputs from 100 A to 1000 A. It measures current, voltage, frequency, active power, power factor, active energy, max demand and harmonics, and is CE, EMC and RED certified for the EU.
Technologies
- Zephyr RTOS
- nRF54L15
- LoRaWAN
- FUOTA
- Bluetooth LE
- Modbus RTU
- MCUboot
Next case study
DEM energy meter series