Hello !
I'm working on a project for a music show and I'm in a bit of a pickle. I got an Arduino Uno (Master) that must send a simple message (three-digit numbers) to multiple slaves Arduino, but after some research, I found out that the RS-232 protocol can only support point-to-point connection. I ordered RS-485 modules to fix that, but the show is in a few days and I fear it will not arrive in time.
My question is can I connect the master's TX pin + ground to multiple slaves RX pins + ground without connection with the slaves TX pins to the master's RX pin.
What I need it the master device to send/broadcast a 3-digit signal which will be received by all slave devices, which will all react to it at the same time. I don't need the slaves to send messages to the master.
Thank you !
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