I need a USB host ?

Projects General Guidance
1

All the previous questions I can find on this are very old, or just old and refer to discontinued products.

I use a pro-micro 32u4 avr to convert button presses to HID keyboard outputs. And for this particular project I want to convert that USB signal back to button presses (digital outputs).

So the device only has to read that one type of device, and it needs 15 digital outputs.

What (arduino IDE compatible) device will do the job?

Thanks.

2

the Espressif ESP32-S3 supports USB OTG Host
is that what you are looking for?

3

In stock!

4

Or how about

USB host MIDI to serial converter

5

Thanks, I will take a look at that but since my post a thread came up and lead me to Teensy 4.1 without Ethernet | Available at SparkFun - SparkFun Electronics

which is $30.

6

Great!
I'm not really a teensy fan and there isn't a teensy catagory on the forum

7

Can I make a suggestion? Don't convert the button presses into HID keyboard outputs. Just convert them into button presses directly. This will be many times easier in every way.

8

don't know about the Teensy OTG Host functionality but ESP32S3 OTG keyboard Host works OK with Arduino IDE V2.3.4 and ESP32 core 3.3.4
e.g. using a ESP32-S3-DevKitC-1 running using EspUsbHost library File>Examples>EspUsbHost>EspUsbHostKeyboard

on entering text serial monitor displays

ESP32S3 OTG host keyboard test
1234567890!"#$%&'()=~^-
abcdefghijklmnopqrstuvwxyz

the ESP32-S3-DevKitC-1 has two USB type C connectors

  1. USB-UART connection for programming/serial monitor
  2. the other for USB OTG device/host

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if the specific ESP32S3 dev board does not have a USB-OTG connector the USB OTG functionality is available on GPIOs 19 D- and 20 D+

9

I've got a Teensy 4.1.
I've never used it as a USB host.

teensy-4p1-without-ethernet
teensy-4p1-without-ethernet700×700 63.3 KB

I'll add the missing pins, make up the necessary lead, and give it a try.

cable_usb_host_t36_2
cable_usb_host_t36_2576×455 30.6 KB

I'll report back if I have any success.

1 Like
10

That’s great, and I like the price of the ESP32 on aliexpress. Will order a couple.

11

make sure you get ESP32S3 dev modules (which support OTG Host)

12

Just to be clear, any S3 module that has two usb ports will support OTG

1 Like
13

But will you like the quality of board you get back? You get what you pay for nothing more.

14

some ESP32S3 dev modules do not have two USB connectors
however, if ESP32S3 pins GPIOs 19 D- and 20 D+ are available they can be used for OTG host
e.g. using OTG Host cdc_acm_vcp_serial on a Heltec WiFi LoRa V3 to connect to a Quectel Mini PCIe EVB Kit (with Quectel EC21-E modem) via RS232

image
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15

Thanks!
@jimmer might also find that info useful