{"id":242365,"date":"2024-03-30T21:37:30","date_gmt":"2024-03-30T20:37:30","guid":{"rendered":"https:\/\/emariete.com\/?p=242365"},"modified":"2024-06-17T09:21:35","modified_gmt":"2024-06-17T07:21:35","slug":"co2-meter-co2-gadget-low-power-with-lilygo-ttgo-t5-epaper-and-sensor-sensirion-scd41","status":"publish","type":"post","link":"https:\/\/emariete.com\/en\/co2-gadget-low-power-medidor-lilygo-ttgo-t5-scd41\/","title":{"rendered":"CO2 Gadget Low Power CO2 monitor with Lilygo TTGO T5 ePaper and Sensirion SCD41 Sensor"},"content":{"rendered":"

One of the easiest ways to have an energy-efficient CO2 meter is to use the CO2 Gadget Advanced firmware together with an ePaper and a CO2, temperature and humidity sensor.<\/p>\n\n\n\n

This combination is not the most energy-efficient possible, but it is very easy to replicate, with guaranteed results and parts are easy to source.<\/p>\n\n\n\n

And while it may not be the most energy-efficient combination possible, it does offer you a simple way to up to three months of battery life on a single charge<\/strong>.<\/p>\n\n\n

\n
\"\"<\/figure>\n<\/div>\n\n\n

Incidentally, and this may seem obvious, but it is no less important: the effect of the e-ink display, with its excellent view<\/strong> is unbelievable.<\/p>\n\n\n\n

<\/p>\n\n\n\n

The ESP32 LilyGo TTGO T5 ESP32 LilyGo TTGO T5 board<\/h2>\n\n\n\n

It is optimised for low power consumption and consists of an ESP32 microcontroller, an e-Ink display (ePaper, as the manufacturer calls it), the display controller and a battery charger, all integrated on a single board.<\/p>\n\n\n\n

One of the best features of this board (along with its low power consumption and integrated battery charger) is that it includes a 2.13\u2033 E-ink display.<\/p>\n\n\n\n

The main advantage of e-ink displays is that they are able to keep the image on the screen without consuming power. That is: once we paint what we want on the screen, we can even cut the power supply and the image will continue to be displayed for months without any energy consumption<\/strong>.<\/p>\n\n\n\n

\"\"
Lilygo TTGO T5<\/figcaption><\/figure>\n\n\n\n

<\/p>\n\n\n\n

The Sensirion SCD41 CO2 sensor<\/h2>\n\n\n\n

Until recently, buying an energy-efficient CO2 sensor was complicated (they were not easy to find) and, above all, expensive (they did not usually cost less than \u20ac60 or more).<\/p>\n\n\n\n

\"CO2,<\/figure>
\n

All this has changed with the advent of the new device and, above all, with the possibility of buying it very easily on sites like AliExpress at very interesting prices (around \u20ac20 including shipping). It is really good at measuring, flexible and its energy consumption is more than acceptable.<\/p>\n<\/div><\/div>\n\n\n\n

CO2 monitor build with TTGO T5 and SCD41<\/h2>\n\n\n\n

The assembly is really easy: You just have to connect it to the only four wires <\/strong>Can it get any easier?<\/p>\n\n\n\n

\"Lilygo <\/figure>\n\n\n\n

The CO2 Gadget Advanced firmware<\/h2>\n\n\n\n

The CO2 Gadget Advanced firmware is probably the most complete and advanced maker firmware available.<\/p>\n\n\n\n

This firmware can be installed on most ESP32-based CO2 monitors (I would say 99% of them), as is or with minimal modifications.<\/p>\n\n\n\n

As it is Open Source and all its source code is published, you can adapt and modify it as you wish. If you are a programmer, or you are just curious, you can find the source code and much more information at the CO2 Gadget repository on GitHub<\/a>.<\/p>\n\n\n\n

I suggest you read the general post about CO2 Gadget to discover all its possibilities:<\/p>\n\n\n

\n\n
\n
CO2 Gadget: Advanced CO2 Monitor<\/a><\/blockquote>