Will take air sensor value reading for Temp, Humidity, CO2 (ppm), and Air Quality (VOC raw val and an index 0-500)
- Cable the sensors to the board in a daisy chain via the STEMMA QT / Qwiic cables.
- Insert the sim card, and connect the attenae
- Cabling
- Feather TX Pin <-> SIM 7xxx LTE Module RX Pin
- Feather RX Pin <-> SIM 7xxx LTE Module TX Pin
- Feather TX Pin <-> SIM 7xxx LTE Module RX Pin
- Feather GND Pin <-> SIM 7xxx LTE Module GND Pin
- Feather 3v3 Pin <-> SIM 7xxx LTE Module 5v Pin
- Connect Battery to battery port
- Connect the sensors via STEMMA QT / QWIIC cables in a chain. Order does not matter.
- Connect the Celluar antenna to MAIN (SIM7600) or the LTE (SIM7060) depending on board labeling.
- Optional:
- If you hook up one of the control pins, or the other 3v3 pin to a pin on the SIM7xxxx board, and move a jumper you can turn the LTE board on and off programiclly. I didnt need to do that so dont know which pins and jumper you need to do.
- Connect the GPS antenna (SIM7600) to AUX or GNSS (SIM7060) depending on board labeling.
- Board
- Adafruit ESP32-s2 Reverse Feather
- Has built in Battery Monitor
- Has built in TFT LCD screen
- Has built in WiFi if needed
- Adafruit ESP32-s2 Reverse Feather
- Sensors
- SGP40 MOX gas sensor
- For the VOC raw and Quality Index
- I dont know what if any units the raw value is in. I was assuming its ppm, but i havent dug through the library code to deeply to confirm that. It might just be a raw sensor value that has no meaning outside the algorithm it runs it through to generate an air quality index.
Please note, this sensor, like all VOC/gas sensors, has variability, and to get precise measurements you will want to calibrate it against known sources! That said, for general environmental sensors, it will give you a good idea of trends and comparison.- i didnt calibrate and have no known sources
- SCD40 Air Sensor
- For temp, humity, and CO2
- Temp and Humidity seem accurateish,
- spec claims
The SCD-40 is lower cost, and is perfect for indoor/outdoor air quality and CO2 measurements. It has a range of 400~2000 ppm with an accuracy of ±(50 ppm + 5% of reading)- I have no way to validate/calibrate CO2 levels
- Adafruit PMSA003I Air Quality Breakout
- Pulls the PPM values
- SGP40 MOX gas sensor
- LTE module
- 1st Try: SIM-7600A
- Worked fine, but didnt have https support in TinyGSM
- Use the v4 sketch file
- I am unsure and it wasnt labeled but... I think the antenna has a SMA male connector, the board has a MHF or UFL female connector surface mounted. And the kit came with the necessary conversion cable
- 2nd Try: SIM7060G
- Will try in v5 file
- Hoping smaller formfactore will make final assembly easier..looks same size as a feather.
- Didnt work
- 1st Try: SIM-7600A
- Sim Card
- Misc
- 2x STEMMA QT / Qwiic cables (No soldering needed)
- Battery
- Helpful links