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ESP32-CAM flash via UART

The TXD pin on Arduino is MCU TXD out to RXD of PC. You need to connect the TXD output of ESP32 to TXD pin of Arduino in order for the PC to receive data. So connect TXD to TXD and RXD to RXD. The UNO ...
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max3232 disconnection suddenly - problem

There is one problem in the schematics provided. The unused pin 10 is left disconnected, and unused logic inputs are not supposed to be left disconnected. The problem may also be related to the LEDs ...
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What size should I select for the resistor? I have led and SSR and 24VDC source

Your attempt is close. But for all the wrong reasons. First you say: "...I have selected 90 Ω. Please let me know if I need to do something differently here. R = (24-3.3)/20mA = 1035 Ω; I ...
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