Administrator Log Your Energy Data to an SD Card with Arduino — Timestamped CSV, No Cloud The monitors show it, the relay acts on it — this one keeps it . An rbAmp module, an Arduino, and a microSD card make a standalone data logger : timestamped voltage, current, power and kilowatt-hours ... Arduino csv data-logger energy monitor ESP32 I2C sd-card 30.07.2026 Projects and Tutorials
Administrator How do I change an rbAmp module's I²C address? On current firmware it's a plain, production-ready operation — no special mode, jumper, or factory tooling . You stage the new address, arm the change, and commit it (a two-phase, magic-armed sequence... faq I2C multi-channel 30.07.2026 FAQ
Administrator Can I put several rbAmp modules on one I²C bus? Yes — that's a core feature. Modules share one I²C bus and differ only by address. Add circuits by adding modules on the same two wires, behind one host — no extra microcontroller, no serial-port jugg... faq I2C multi-channel 30.07.2026 FAQ
Administrator What I²C bus speed should I use, and why 50 kHz on ESP32? It depends on the host driver , not the board brand: Host / driver Bus speed ESP-IDF i2c_master — ESPHome, MicroPython-ESP32, Arduino-ESP32 50 kHz STM32 HAL · RP2040 · non-ESP32 Arduino (AVR/STM32duin... ESP32 faq I2C 30.07.2026 FAQ
Administrator Do I need external I²C pull-up resistors for rbAmp? For a single module , no — the rbAmp PCB carries built-in 4.7 kΩ pull-ups on SDA/SCL to 3.3 V. For a multi-module bus , keep the pull-ups on one module and disable them (a solder jumper) on the rest, ... faq hardware I2C 30.07.2026 FAQ
Administrator Why is rbAmp 5 V-powered but the I²C bus is 3.3 V? The module has its own microcontroller doing the measurement, and it needs clean, stable power to keep the ADC readings accurate. So the module takes 5 V on VCC and runs it through an on-board low-noi... faq hardware I2C power 30.07.2026 FAQ
Administrator rbAmp — Frequently Asked Questions Quick answers to the most common rbAmp questions — power, accuracy, I²C, addressing, energy, and integration. Power hardware Why is rbAmp 5 V-powered but the I²C bus is 3.3 V? Do I need external I²C p... Arduino energy-monitoring ESP32 esphome home-assistant I2C 30.07.2026 FAQ
Administrator Meter Several Circuits with One Arduino — a Multi-Module rbAmp Bus The standalone monitor put one module on a screen. Real installations have more than one circuit — mains plus a few branches, or three phases. The naive answer (one meter per circuit, each on its own ... Arduino energy monitor ESP32 I2C multi-channel 30.07.2026 Projects and Tutorials
Administrator Build a Standalone Arduino Energy Monitor with rbAmp — Watts on an OLED, No Network Not every energy project needs Home Assistant, a cloud, or even Wi-Fi. Sometimes you just want a little box on the bench that says 230 V · 0.21 A · 48 W · 0.97 PF on a screen, updating every second — ... Arduino energy monitor ESP32 I2C oled 30.07.2026 Projects and Tutorials
Administrator Three-Phase Energy Monitoring in Home Assistant: 3× rbAmp UI on One ESP32 If you've read why three single-phase meters can't measure your 3-phase power , you know the trap: three independent meters sample at different instants, so their numbers don't add up. This is the bui... energy-monitoring ESP32 esphome home-assistant I2C three-phase 29.07.2026 Projects and Tutorials
Administrator Migrating from PZEM-004T to rbAmp — Keep All Your Home Assistant History Why leave a PZEM that works? A PZEM-004T is a fine little meter. It keeps its own kilowatt-hour total in EEPROM, so your energy survives a reboot, and for one circuit it does the job. You outgrow it f... energy-monitoring esphome home-assistant I2C migration pzem-004t 29.07.2026 Projects and Tutorials
