CubeCell AB01 with Sensirion SCD41 Co2 sensor

#1

I initially posted the initial I2C scan problem last week; however, I could not reply to that topic so I had to open a new one.

Hardware:
CubeCell AB01
Sensirion evaluation kit SCD4.1

Arduino IDE 2.0.0-beta.11

Testing Program

With this wiring along with two 10k OHM pull-up resistors on I2C bus along with the 3.3V VDD

working-SCD41-wiring
working-SCD41-wiring.jpg3264×2448 1.45 MB

I got some readings as following:

Serial: 0x76EABASXXXX

Co2:1035 Temperature:22.74 Humidity:57.89

Co2:1087 Temperature:22.21 Humidity:59.43

Co2:1108 Temperature:22.03 Humidity:60.59

But the problem is that the reading is not consistent; most of time I got: Not enough data received as following:

Waiting for first measurement… (5 sec)
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Not enough data received
Error trying to execute readMeasurement(): Not enough data received
Error trying to execute readMeasurement(): Not enough data received
Error trying to execute readMeasurement(): Not enough data received

What did I do wrong and what should I do to make the reading stable?

Thanks

#2

Like what just happened again as the following.

Copyright @2019-2020 Heltec Automation.All rights reserved.
Serial: 0x76EABFXXXXXX
Waiting for first measurement… (5 sec)
Co2:930 Temperature:23.92 Humidity:52.97
Co2:1002 Temperature:23.95 Humidity:53.58
Co2:1075 Temperature:23.86 Humidity:54.11
Co2:1132 Temperature:23.72 Humidity:54.72
Co2:1151 Temperature:23.61 Humidity:55.18
Co2:1151 Temperature:23.47 Humidity:55.66
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Received NACK on transmit of data
Error trying to execute readMeasurement(): Received NACK on transmit of data

It was working for 6 readings; then it just went bad immediately.