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| Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
| projects:mees [2021/03/25 17:36] – [TODO for REV. B] trimen | projects:mees [2022/01/11 20:07] (current) – [Used parts:] trimen | ||
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| 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\\ | ||
| - | < | + | < |
| | | ||
| 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 |
| 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, | Add UART on board for particle sensors (HPMA115C0-XXX, | ||
| Add RF blocking inductor to VDDPA of ESP8285\\ | Add RF blocking inductor to VDDPA of ESP8285\\ | ||
| + | Add RGB LED for indication\\ | ||