Hello,

I finally got this sensor to work but instead I use this lib: https://github.com/nara256/mhz19_uart
Another very useful source of information is this: https://revspace.nl/MHZ19#command_0x62_.28device_name_.2F_id.29

Take note that is the MH-Z19B the methods isWarming() and getStatus() do not work.

Can you please share the values that you are getting? I'm getting around 1500ppm and it is alarming by these website standards:
https://www.engineeringtoolbox.com/co2-comfort-level-d_1024.html
https://www.kane.co.uk/knowledge-centre/what-are-safe-levels-of-co-and-co2-in-rooms

I didn't have the opportunity yet to get the sensor outdoors.

Thank you in advance

@mfalkvidd said in MH-Z19 CO2 sensor:

@daniel-oliveira isn't this sufficient? If not, what is missing?

 *  MH-Z19 CO2 sensor
 *  It communicates with your board over serial at 9600 speed.
---
SoftwareSerial mySerial(10, 11);                  // RX, TX . You can choose other pins if you prefer.

Missed that one, got confused due to the multiple possible ways to connect this sensor. (UART, PWM, etc)

So TX, RX, GND and Vin sould be enough?

Hi!

Thank you for sharing, can you please point me out how do I wire this thing up?

Is this project dead? Can't reach homepage

Hi,

I'm not an expert and honestly I didn't read all the comments, but to avoid the relay to change status on reboots would not be a simpler solution to add a "flip-flop" mechanism that will "save" the last sate for some minutes?

Best regards

Hi,

Can you please give a reference for the MDMS series devices? I'm not aware of it neither was able to find any reference in the forum. But I'm curious.

Hello all,

I think that good quality power source is a very important aspect to have a stable MySensors network or any other projects.
In this forum there are a lot of people facing problems that are solved by improving how they power their projects, but despite that I think that all related information is scattered in the forum and not always easy to find or to relate.

So, why not bring this amazing community together and point here some good practices on how to power our nodes?
I would like to start this by addressing first two topics, "approved" power adaptors and bypass capacitors.

Power adaptors:

• Cellphone chargers
• HLK PM01 (toAddLink)
• ToBeCompleted

Bypass Capacitors:
(What is a bypass capacitor: http://www.learningaboutelectronics.com/Articles/What-is-a-bypass-capacitor.html)

• NRF24L01: To discuss in this thread
• ESP8266: 470uF as close as possible to Vin and GND pins

Please add your opinions and knowledge about this topic, my goal is to keep this post up to date with shared information.

For example, what are the values that you recommend for the NRF24L01 and why? I saw people mentioning 4.5uF, 10uF and 47uF. Personally I'm using the latter and I have no issues.

Thank you all.

Well... I'm sorry for you, but at least now everyone that reads this thread will be aware.

Cheers

Can someone please point me out the software used to design the PCB?
If I got some time I would like to try out the improvements that I've mentioned before.
It makes more or less 10 years the last time that I've did some PCB design with Eagle, nostalgia....

Just found this in the product description : "LED Type: 1 WS2811 IC control 3 LED Chip,"