ATTNode v3 CO2 Sensor Addon and Multisensor support

Sun, 28 Mar 2021 00:00:00 +0000

grauzone has created an ATTNode v3 addon board for the MH-Z19C CO2 Sensor. The addon has an onboard 3,3V voltage regulator to supply the node while providing the needed 5V to the sensor (directly from a 5V supply). It also incorporates 2 WS2812B RGB LEDs to signal current LoRa status as well as the current CO2 Level. Details on the hardware can be found on Github .

While adding the code for the CO2-Sensors I also extended the firmware to support multiple sensors. For example a BME280 and a CO2-Sensor can be added in parallel. See the README.md in the Firmware Repository for further details on how to use it.

ATTNode Addon: Powerpack

Fri, 08 Jan 2021 00:00:00 +0000

grauzone has developed a simple voltage regulator board to make more power sources usable for the ATTNode:

Overview

This is an add-on for the ATTNode to supply it with operating voltages between 3.5-16V. The voltage source must provide at least 120 mA. The PCB has the format of the CR2032 battery clip and is soldered to the back of the node instead of the clip. This allows the node to be powered by a USB power supply, a LiPo or any other fixed voltage power supply. Here are some pictures of the add-on:

Addon on ATTNode

ATTNode v3 CO2 Sensor Addon and Multisensor support

ATTNode Addon: Powerpack

Overview