Dev Log #17:
Tested the PMS5003 and it works. Plan is to add sensors one by one so troubleshooting is easier. Mapped out wiring for SCD40 (I2C bus) and MQ-135 (A0, 5V). Wrote test code that reads CO2, temp, humidity from SCD40 and raw gas readings from MQ-135. MQ-135 will be used as a relative gas-trend sensor unless calibrated later. Next up is combining everything with RF telemetry, SD logging, and OLED.