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
