How could I use serial read block to read message from other mcu with ESP32 board？

[Tom Ming]

Could I use serial read block to read message from other mcu with ESP32 board？

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[John Maloney]

Yep! Just connect the TX pin of one board to the RX pin of the other and vice versa.

You can find the serial pins for various boards here.

[Turgut Guneysu]

Hi Tom,

connect the boards with shared GND, power, and criss-cross TX and RX pins:

ESP322 OTHER

tx = 17 rx = ??

rx = 16 tx = ??

Then set the baud rates on both sides to the same value.

Individually or in a read loop, use serial read to get bytes. they will be in byteArray format, values 0-255 for each character read.

To convert to string, use the join block with an empty slot and the byteArray value(s).

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Alternatively, you can connect ESP32 Tx and Rx to each other and do a loop test all in MicroBlocks, get your working and then use the other end to communicate.

Good Luck.

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[John Maloney]

Thanks for providing those detailed instructions, Turgut.

[Tom Ming]

Hi @John Maloney ,

Thanks for your quick reply. It is helpful.

I made it.

[Tom Ming]

@Turgut Guneysu

Thanks a lot for your detailed instructions. I made it.

Two ESP32 boards run MicroBlocks communicate with each other.

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MicroBlocks read message from Arduino board.

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[Tom Ming]

Thanks John Maloney and Turgut Guneysu.

I made it.

[John Maloney]

Glad you got it working! Thanks for sharing your test projects.