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A comment on ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors.

Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by zamadatix on Saturday February 04, 2023 @10:49AM (#34655313)
Anyone have a recommendation for something that can take 2 USB in and be the USB device to 2 separate up stream systems? I’d like to build something can pass through a keyboard and mouse to 2 systems but also embed some hot key actions and the like so it always works regardless if my preferred OS install is configured and booted.
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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by tyingq on Saturday February 04, 2023 @11:16AM (#34655523)
The Teensy is very popular for acting as either USB host or peripheral and there's lots of projects to draw ideas and code from. The latest one only has 2 physical USB ports, so you would have to use a hub for your use case. I don't think you'll find a microcontroller with 4 physical ports anyway.

https://www.pjrc.com/store/teensy41.html

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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by zamadatix on Saturday February 04, 2023 @11:29AM (#34655617)
Hub for the inputs is fine but I think I'd need 3 physical ports in that case - 1 for the hub and 2 for the separate outs.

However... it just occurred to me I could connect 2 together for cross signaling over the other pins and have 2 in and 2 out that way.

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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by tyingq on Saturday February 04, 2023 @11:47AM (#34655793)
Another idea, STM32F103C8...3 physical USARTS.

A project using it: https://github.com/satoshinm/pill_serial

Specs: https://www.st.com/en/microcontrollers-microprocessors/stm32...

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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by robbs on Saturday February 04, 2023 @11:00AM (#34655384)
RaspberryPi can be both a USB host and a HID device. Sounds like a fun project!
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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by zamadatix on Saturday February 04, 2023 @11:04AM (#34655425)
I thought about a Pi running a RTOS but I couldn’t find a way to get it to be a HID device to two different computers at the same time.
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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by michaelt on Saturday February 04, 2023 @12:42PM (#34656330)
Why not have two microcontrollers, and have them talk to one another over serial?

I've never heard of a microcontroller that provided the feature you're looking for, unfortunately.

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Re:ESP32 Buyer’s Guide: Different Chips, Firmware, Sensors by pomatic on Saturday February 04, 2023 @05:06PM (#34658895)
You want 2 or more off CH9350 - HID mouse/keyboard to serial adapters - they are designed for exactly your application. Wire back-to-back and piggyback an ESP of your choice on the serial ports to eavesdrop/intercept/augment. Available from Ali.
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