1. Here, the idea is to control the passive buzzer (5 V) via the ESP32 (as you know, it has a logic state of 3.3 V). Is the connection correct?
2. Same here, only it's about controlling the 5 V fan (speed). The FAN pin goes to the ESP, and on the left we have the plug that I plug the fan into.
3. Here it's all about diode control - the diodes are at 5 V, the ESP is again at 3.3 V, so I need to raise the logic state with SN74AHCT1G125DCKR. Please check that I have connected this correctly.
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4. This is already giving me a headache because I don't know how to bite it - I need 9 logic states to convert from 3.3V to 5V. The SN74AHCT125N runs on LOW, so the idea was to wire all the OEs (i.e. 9 OEs) to one ESP32 pin and control HIGH or LOW with that. But I'm thinking this way, there could be different states on this pin during power-up or reset, so it needs to be protected somehow.
Additionally:
I want to do a "mushroom" protection. I have two independent lines on it. I would like hardware and software protection, ie:
- one line to the ESP (e.g. GND -> pin) so that I know programmatically when the mushroom is pressed and can disable the OE,
- the other line as hardware protection - in case ESP doesn't work for some reason, I want to physically disconnect the OE (i.e. force HIGH on the OE pin).
2. Same here, only it's about controlling the 5 V fan (speed). The FAN pin goes to the ESP, and on the left we have the plug that I plug the fan into.
3. Here it's all about diode control - the diodes are at 5 V, the ESP is again at 3.3 V, so I need to raise the logic state with SN74AHCT1G125DCKR. Please check that I have connected this correctly.
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4. This is already giving me a headache because I don't know how to bite it - I need 9 logic states to convert from 3.3V to 5V. The SN74AHCT125N runs on LOW, so the idea was to wire all the OEs (i.e. 9 OEs) to one ESP32 pin and control HIGH or LOW with that. But I'm thinking this way, there could be different states on this pin during power-up or reset, so it needs to be protected somehow.
Additionally:
I want to do a "mushroom" protection. I have two independent lines on it. I would like hardware and software protection, ie:
- one line to the ESP (e.g. GND -> pin) so that I know programmatically when the mushroom is pressed and can disable the OE,
- the other line as hardware protection - in case ESP doesn't work for some reason, I want to physically disconnect the OE (i.e. force HIGH on the OE pin).
