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U13 Package marking shows CM040B. TI Park marking lookup provides CD4040BPW U16 Package marking shows C22A. TI Part marking lookup provides LMV761. The SOT-23 footprint appears to match what is on the PCB. Sens 4 is know to be capacitive since it is listed as such on page 13 of the [https:<references group="IC Footnotes" //web.archive.org/web/20200619153019/https://www.wmo.int/pages/prog/www/WMOCodes/WMO306_vI2/LatestVERSION/WMO306_vI2_CommonTable_en.pdf WMO Common Code Tables Document]>
→Components: Changed notes to footnotes
''U12 - (Marked G5/849)''
'''U13''' - [http://web.archive.org/web/20200214104034/http://www.ti.com/lit/ds/symlink/cd4040b.pdf CD4040BPW] - 12-stage Ripple-Carry Binary Counter/Divider<ref group="IC Footnotes" name="U13">Package marking shows CM040B. TI Park marking lookup provides CD4040BPW.</ref>
'''U14''' - [http://web.archive.org/web/20200214042837/http://www.ti.com/lit/ds/symlink/cd74hc4051.pdf CD74HC4051PWR] - High-Speed CMOS Logic Analog Mux/Demux - 8:1
'''U15''' - [https://www.ti.com/lit/ds/symlink/lmc555.pdf TI LMC555CMM Family] per the ZC5 marking noted in datasheet. Pinout and footprint matches.
'''U16''' - [http://web.archive.org/web/20190417163532/https://www.ti.com/lit/ds/symlink/lmv761.pdf LMV761MF] - Low Voltage Precision Comparator w/ Push-Pull Output <ref group="IC Footnotes" name="U16"> Package marking shows C22A. TI Part marking lookup provides LMV761. The SOT-23 footprint appears to match what is on the PCB.</ref>
''U17 - (Marked Z252)''
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Sens 4 - Capacitive Relative humidity sensor<ref group="IC Footnotes" name="Sens4"> Sens 4 is known to be capacitive since it is listed as such on page 13 of the [https://web.archive.org/web/20200619153019/https://www.wmo.int/pages/prog/www/WMOCodes/WMO306_vI2/LatestVERSION/WMO306_vI2_CommonTable_en.pdf WMO Common Code Tables Document]</ref>
===Notes===
== Test Points ==
