#2017 ESP8266 FIRMWARE UPDATE#

The IoTaWatt supports a number of different sizes of CT sensors with calibration presets for CT sensors e.g 20A, 100A (standard) and 200A. Another key advantage is the flexibility of the IoTaWatt, each input channel (AC voltage & current) can be individually configured and calibrated. The obvious advantage of the IoTaWatt over the emonTx is the number of CT sensor inputs.

Flexible configuration (many different types of CTвЂ™s supported).

Multiple emonTxвЂ™s can communicate with a single emonPi / emonBase.

#2017 ESP8266 FIRMWARE UPDATE#

Approximate 3-phase with firmware update.

Supports Optical Pulse sensor (interrupt input) to interface directly with utility meters.

Supports multiple DS18B20 temperature sensors.

Low power: battery power / single AC-AC adaptor.

Each unit has advantages in key areas: emonTx Advantages The IoTaWatt is not designed to replace the emonTx, rather to complement it. Firmware updates are digitally signed.ДЄs I mentioned at the beginning of this post, there are no plans to discontinue the emonTx. However, Emoncms offers an in-built transport layer encryption solution where the emoncms apikey is used as the pre-shared key for encrypting the data with AES-128-CBC.ДЄutomatic OTA firmware updates ensure the IoTaWatt is always running the latest most secure version e.g a firmware update was released and automatically deployed to fix the KRACK WPA vulnerability. Due to the limited resources of the ESP8266 microcontroller HTTPS connection is not possible. IoTaWatt supports end-to-end encrypted connection to Emoncms using new Emoncms API transport layer encryption. The IoTaWatt supports automatic over the air (OTA) firmware updates. The IoTaWatt is configured via a web interface served directly from the IoTaWatt ESP8266. Using the IoTaWatt on a WiFi network with a reliable internet connection is highly recommended, however, the IoTaWatt can operate without an internet connection once the RTC has been initially set via NTP.

If the IoTaWatt is posting to an Emoncms server and loses network connectivity data logged to the SD card will be bulk uploaded to Emoncms when a network connection is restored.ДЄn on-board real-time clock (RTC) ensure the time-stamp is always correct. The onboard SD card allows data to be saved locally with high resolution and network resilience. The ESP8266 is mounted using NodeMCU adaptor, the decision was made to use the NodeMCU form-factor to allow flexibility for customisation and future upgrades e.g ESP32. The IoTaWatt uses the WiFi enabled ESP8266 (ESP-12S) microprocessor. IoTaWatt is fully open-source and has been developed by Bob Lemaire in partnership with OpenEnergyMonitor. Both the IoTaWatt and emonTx have advantages in key areas which complement each other. There are no plans to discontinue the emonTx. IoTaWatt can log data locally to on-board SD card and post directly to via WiFi.

ItвЂ™s based on the ESP8266 IoT platform using MCP3208 12 bit ADCs to sample AC voltage and current. IotaWatt tm is an open-hardware 14 channel WiFi connected electric power monitor.

2017 esp8266 firmware