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projects:mees [2021/03/25 17:33]
trimen [TODO for REV. B]
projects:mees [2022/01/11 20:07] (current)
trimen [Used parts:]
Line 14: Line 14:
 CSS811 - TVOC and eCO2 sensor\\ CSS811 - TVOC and eCO2 sensor\\
 SI7021 - relative humidity and temperature sensor\\ SI7021 - relative humidity and temperature sensor\\
-<del>MR44V100AMAZAATL - I2C FRAM for data logging</del> +<del>MR44V100AMAZAATL - I2C FRAM for data logging</del> \\
  M24M01-RMN6P - I2C EEPROM for calibration data storage\\  M24M01-RMN6P - I2C EEPROM for calibration data storage\\
 ESP8285 - main CPU with WiFi\\ ESP8285 - main CPU with WiFi\\
Line 28: Line 28:
 Add pull-up resistor to GPIO2\\ Add pull-up resistor to GPIO2\\
 Add clearance on sides of antenna/use chip antenna\\ Add clearance on sides of antenna/use chip antenna\\
-Find another USB to UART converter, because Silicon Labs chips are unavailable\\+Find another <del>USB to UART converter</del> chips, because <del>Silicon Labs</del> chips are unavailable\\
 Find another temperature and humidity sensor\\ Find another temperature and humidity sensor\\
 Enlarge board & add better thermal isolation between CPU, gas sensors, and temperature sensor\\ Enlarge board & add better thermal isolation between CPU, gas sensors, and temperature sensor\\
 + -> maybe a mezzanine board?\\
 +--> currently this isn't an issue when the fan is unregulated\\
 Add mounting holes\\ Add mounting holes\\
 Add 4R7+1uF RC element to VDD of SGP40 and CCS811 sensor\\ Add 4R7+1uF RC element to VDD of SGP40 and CCS811 sensor\\
 Add UART on board for particle sensors (HPMA115C0-XXX, SPS30...)\\ Add UART on board for particle sensors (HPMA115C0-XXX, SPS30...)\\
 Add RF blocking inductor to VDDPA of ESP8285\\ Add RF blocking inductor to VDDPA of ESP8285\\
 +Add RGB LED for indication\\