Signal: EMAC_RXD2 - Ethernet MAC MII/RII interface.designated as a (wpd) "weak pull down" by ESP32_S datasheet v3.4 pg53 IO/Mux Addendum.ADC2_CH2- 12bit SAR ADC, SD Memory card v3.01.
Supports Capactive Sensing T2 (see ESP32_S datasheet section 4.1.5 "Touch Sensor").strapping pin - ESP32_S datasheet, default:pull-down - must be down to download boot on GPIO0).designated as a (wpu) "weak pull up" by ESP32_S datasheet v3.4 pg53 IO/Mux Addendum.listed in ESP32_S datasheet as "RTC_Function2" I2C_SDA.Signal: EMAC_TX_CLK - Ethernet MAC MII/RII interface.Supports Capactive Sensing T1 (see ESP32_S datasheet section 4.1.5 "Touch Sensor").strapping pin - ESP32_S datasheet, default:pull-up spi-boot:1, download-boot:0.CSI_MCLK is used by Camera (line 12 on FPC).Internally has a 3.3v 10k pullup resistor (R19).Pull to ground (at reset) to put board into flash mode.However pins listed as "not exposed" could be accessible using a soldering iron, or a custom FPC in the camera interface. not exposing the I2C pins) significantly cripple the possible applications. To make matters a bit more confusing the layout seems to be done by a inebriated engineer or (more likely) a trace auto-router. You'll discover most of the pins on the ESP32 cam are already used or have wonky behaviors.
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