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The 74HC125 chip. Just a little 14-pin DIP package, but it solves all of the AUX bus interface issues for us! It acts as the go-between for the 3.3V ESP32 chip and the 5V Celestron AUX bus. As wired in this project, it properly pulls signals LOW when needed, and allows them to float HIGH otherwise.
The 74HC125 chip. Just a little 14-pin DIP package, but it solves all of the AUX bus interface issues for us! It acts as the go-between for the 3.3V ESP32 chip and the 5V Celestron AUX bus. As wired in this project, it properly pulls signals LOW when needed, and allows them to float HIGH otherwise. (74hc125)
74hc125 (2/18):
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