LMS-6 Radiosonde: Difference between revisions
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===Analog Multiplexer=== | ===Analog Multiplexer=== | ||
U14 is an 8-channel mux/demux. | U14 is an 8-channel mux/demux. | ||
* Four of the channels (A0-A3) go to SP1. | |||
* (A4-A7 appear to go to SENS2-4, need to be traced) | |||
* Pin 3 is the common in/out and goes to R13 (560k) and R15 (47k). R15 goes to U15 Pin 7 (555 Reset), and R13 goes to U15 Pin 8 (555 Control.) | |||
* Address Select 0 is connected to ST7 Pin 2 / PB0 | |||
* Address Select 1 is connected to ST7 Pin 3 / PB1 | |||
* Address Select 2 is connected to ST7 Pin 4 / PB2<br /> | |||
==Original Firmware== | ==Original Firmware== | ||