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===Peripheral attachment points===
*U-Blox GPS is attached to USART_2 on the STM32 via pins PA2 ==== LED's and PA3*External serial port (USB connector) is attached to USART_1 (PA9 and PA10), sharing TX/RX with the external I²C bus.Buttons ====
Added more pictures, pinouts of sensor stalk, identified ICs, peripheral attachment pinouts
*Transmitter: Si4063
* Button = PC8* LED_Y = PC7* LED_G = PC6* LED_R = PB12 ==== GPS ==== * PA3(RX) = GPS TXD* PA2(TX) = GPS RXD ==== UART via USB Port ==== * PA9(TX) = USB D+* PA10(RX) = USB D- ==== Si4063 ==== * PB2 = CS/nSEL* PA7 = SDI* PA6 = SDO* PA5 = SCLK == Identified Supplementary IC's =='''V719''' = [https://www.mouser.com/datasheet/2/389/stg719-1850635.pdf STG719STR Low Voltage 4 Ohm SPDT Switch] '''C22A''' = [https://www.ti.com/lit/ds/symlink/lmv762.pdf LMV761 Low Voltage Precision Comparator with Push/Pull Output] '''636EE''' = [https://www.mouser.com/datasheet/2/427/dg636e-1766306.pdf DG636EEQ Siliconix/Vishay Dual SPDT Switch] '''LW053A''' = [https://www.ti.com/lit/ds/symlink/sn74lv4053a.pdf Triple 2 Channel Analog Multiplex/Demultiplexer]<br />
==Photos==
File:Label id speculaton.jpg|Possible meanings of the internal labels and values. The date code in particular which may be useful to date production times. NWS sondes have the same cryptic string printed on the outside of the sonde where the mfg. date normally is on other countries'. "TU" may just indicate the board comes with sensors according to a third party source<ref>https://sondehunt.de/language/en/archive/1189</ref>.
File:Sensor stalk pinout.jpg|Pinout of the DFM-17 sensor stalk. Not all pins are used, and some seemingly are connected to a trace but end abruptly.
File:V719 and others removed.jpg|V719 SOIC packages removed as well as 636EE (SPDT Switch) and LW053A (Mux/Demuxer)
File:Stalk pinout mapping.png|Mapping of the pins on the sensor stalk to the connector and their corresponding IC/IO lines. '''''<u>Top of sensor stalk corresponds to bottom of pictured connector!</u>'''''
File:Dfm back pcb no battery.jpg|Back of the DFM PCB without CR123A battery holders
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