I am testing the EVAL_PASCO2_SENSOR2GO in two configurations:
1) I connect the whole kit to the USB port of my PC and I launch the XENSIV software. The software connects to the device on COM4 and reads the CO2 concentration in my room, which is about 620ppm (seems reasonable to me).
2) I have made a custom interface board, which includes a boost converter to provide 12V and a microcontroller (Teensy 3.2) to communicate to the XENSIV™ PAS CO2 sensor directly via I2C. In this case, I talk directly to the sensor board not to the kit. I read the CO2 level using the microcontroller and the Arduino library, which offers .ino example files for single shot measurements of the CO2.
In the second config, I see the sensor is acknowledged via the serial interface and the product ID is read. Also the single-shot measurement example cumpiles smoothly, without errors, but this time the CO2 reading reported are always negative numbers, in the order of "-1240" (I presume ppm).
I wonder if somebody could help in telling me what could be wrong with the second config, as I don't think getting a negative number for CO2 levels makes any physical sense. Regardless of the sign, also a value of 1240 seems way too off from the 620ppm I got in the first configuration.
Any help would be much appreciated.
What is the minimum time for 3.3V ON to 12V ON in the 3.3V / 12V power-on sequence?
According to AN_2106_PL38_2107_132213, the order is written, but the interval is not described.
Measurement mode configuration register (MEAS_CFG) Is it possible to measure in a time shorter than the minimum measurement interval of 5 seconds in continuous mode when OP_MODE is used in Single-shot mode? ex. 2s
We are planning to control both 3.3V / 12V power supplies to OFF / ON / OFF in order to reduce power consumption, but is it okay to repeat OFF / ON / OFF at short intervals (example: 5 seconds)? Is there any effect on the life of the IC?
How do you read the data thru UART, for the changes in the CO2 measurement using the Mini board?
Can i just provide the supply Vcc to the board only, instead of using another external MCU like Arduino? If not, why?
There is no changes in the UART pin. Why? I thought this part interface is I2C, Uart and GPIO?
What i need to do? Please advise.
Thank you.Show Less
Does this actually exist? Can I buy it anywhere?
It's a lot more usable with an onboard 12v booster.vs the miniboard
Hi, I'd appreciate it if you could provide its circuit schematic ! XENSIVTM PAS CO2 Evaluation Motherboard and XENSIVTM PAS CO2 Mini Evaluation Board，Show Less
PASCO2V01AUMA2 (not for new design)
De link on de website for the LG-MLGA-14 package points to the LG-MLGA-14-1
An LG-MLGA-14 3D model and a package outline drawing is not aviable on the website.
What are the difference between the LG-MLGA-14 and the LG-MLGA-14-1?