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--- projects:mees [2021/03/21 12:20] – [Current progress:] trimen
+++ projects:mees [2022/01/11 20:07] (current) – [Used parts:] trimen
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 =======MEES=======
 (MQTT enabled environmental sensor)
+{{:projects:single.jpg?400|}}
 =====About=====
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 CSS811 - TVOC and eCO2 sensor\\
 SI7021 - relative humidity and temperature sensor\\
-MR44V100AMAZAATL - I2C FRAM for data logging\\
+<del>MR44V100AMAZAATL - I2C FRAM for data logging</del> \\
+ M24M01-RMN6P - I2C EEPROM for calibration data storage\\
 ESP8285 - main CPU with WiFi\\
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 Develop SW\\
 Integrate with ventilation\\
+===TODO for REV. B===
+Add pull-up resistor to GPIO2\\
+Add clearance on sides of antenna/use chip antenna\\
+Find another <del>USB to UART converter</del> chips, because <del>Silicon Labs</del> chips are unavailable\\
+Find another temperature and humidity 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 4R7+1uF RC element to VDD of SGP40 and CCS811 sensor\\
+Add UART on board for particle sensors (HPMA115C0-XXX, SPS30...)\\
+Add RF blocking inductor to VDDPA of ESP8285\\
+Add RGB LED for indication\\