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 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 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
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 Real-Time Load Control with rbAmp — Current Limits, Alerts & Load Shedding in Home Assistant The problem this solves The main breaker trips when the EV charger, the water heater and the workshop all pull at once. Or you want to cap a circuit — a rental outlet, a garage socket — so it can't ex... current-monitoring ESP32 esphome home-assistant load-control load-shedding peak-shaving 29/07/2026 Projects and Tutorials
Administrator The Whole Panel on One ESP32 — Real Per-Circuit Energy in Home Assistant The problem this solves Your utility meter says the house is pulling about 3.9 kW right now. It won't tell you that the water heater is ~2.2 kW of it, the AC compressor another ~1 kW , and the rest is... ct-clamp emporia-alternative ESP32 esphome home-assistant per-circuit whole-house-energy 29/07/2026 Projects and Tutorials
Administrator rbAmp in the Home Assistant Energy Dashboard in 15 Minutes The problem this solves You want one honest number in Home Assistant: how much power this appliance is actually pulling, right now, and how many kilowatt-hours it burns over a month. The usual DIY ans... ct-clamp energy-monitoring ESP32 esphome home-assistant 28/07/2026 Projects and Tutorials
