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Hardware: crystal ~6.9 mm from ATmega1284P — move closer to reduce stray capacitance
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: USB-C SBU1/SBU2 pins floating — should be tied to GND
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: BME280 (U10) placement near heat-generating ICs degrades temperature accuracy
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: USB D+/D− traces not impedance-controlled for 90 Ω differential
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: no ESD/TVS protection on battery connector J3 or external connector J2
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: crystal load capacitors (18 pF) may not match crystal CL spec — verify and correct
bugSomething isn't workingSomething isn't workingStatus: Open.Hardware: no local bypass capacitor at SD card connector VDD pin
bugSomething isn't workingSomething isn't workingStatus: Open.Hardware: no dedicated bypass capacitor on MCP3421 (U14) VDD pin
bugSomething isn't workingSomething isn't workingStatus: Open.Hardware: AVCC and AREF connected directly to 3V3 with only 100 nF decoupling — ADC accuracy limited
enhancementNew feature or requestNew feature or requestStatus: Open.Hardware: 3V3_FTDI rail has two drivers — Q2 source and FT231X 3V3OUT — risking contention
bugSomething isn't workingSomething isn't workingStatus: Open.Hardware: C12 (100 nF) below TPS79733 datasheet minimum input capacitance
bugSomething isn't workingSomething isn't workingStatus: Open.Hardware: missing pull-up resistor on DS3231M SQW/~INT~ open-drain output
bugSomething isn't workingSomething isn't workingStatus: Open.