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 Which boards and frameworks can I use with rbAmp? Anything that speaks I²C: ESPHome / Home Assistant , Arduino / C++ (ESP32, Uno, Nano, STM32, RP2040…), Python on a Raspberry Pi or other Linux SBC, and ESP-IDF . All four client libraries are open and... Arduino esphome faq integration python 30/07/2026 FAQ
Administrator Does rbAmp measure real power or just current? Real (active) power, in watts, computed on the module per channel — plus voltage, current, power factor, and frequency. Because it has both the voltage and the current for each channel, reactive and l... accuracy faq power-measurement 30/07/2026 FAQ
Administrator How accurate is rbAmp? It depends on the current sensor, so here's the honest ladder. With the factory-paired rbAmp CT — module and clamp calibrated together at the factory — it's ±0.5 % of reading per channel , guaranteed ... accuracy faq 30/07/2026 FAQ
Administrator Is the rbAmp module isolated from mains? Yes — there's a galvanic isolation barrier inside between the mains side (voltage sense, CT input) and the low-voltage side (I²C). The module's GND is the host's ground, not mains neutral, so wiring t... faq hardware safety 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 Local Current-Limit with Arduino — Trip a Relay Before the Breaker, No Cloud The monitors show you the current. This one acts on it : when a circuit stays over your limit, the Arduino trips a relay to shed the load (or sounds an alert) — and it does it in its own loop, no Home... Arduino current-monitoring ESP32 load-control load-shedding 30/07/2026 Projects and Tutorials
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 rbAmp vs PZEM-004T — Which AC Energy Monitor for ESP32 & Home Assistant? rbAmp vs PZEM-004T: which AC energy monitor should you build with? The PZEM-004T is the default first energy meter for a reason — it's a few dollars, it works, and half the tutorials on the internet u... comparison ESP32 esphome home-assistant pzem-004t 29/07/2026 Comparisons
