ESP32

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mrburnette
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ESP32

Postby mrburnette » Fri Feb 17, 2017 4:41 pm

I needed some items quicker than the China boat could get here, so I ordered from Adafruit and was willing to pay the UPS delivery standard rate.

Before I hit ENTER for my order, I went around doing some window-shopping to lessen the sting of the too-high shipping costs; I found the ESP32 dev board. Today is the first play time with the product.

The Espersssif github for Arduino ESP32 is further along than what I expected. Installing the core & tools on my Linux workbook took less than 10 minutes. I pulled up the ArduinoIDE, configured the board selector for ESP32 dev, loaded the supplied WiFiScan sketch; presto, it compiled and successfully ran.

Sketch uses 387,073 bytes (37%) of program storage space. Maximum is 1,044,464 bytes.
Global variables use 30,476 bytes (10%) of dynamic memory, leaving 264,436 bytes for local variables. Maximum is 294,912 bytes.


Gotta love the SRAM values!

Ray

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RogerClark
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Re: ESP32

Postby RogerClark » Sat Feb 18, 2017 1:12 am

Thanks Ray

That's certainly a good deal if you are in the USA. (outside the USA I suspect the shipping costs make it more expensive than from Chinese suppliers)

ESP32 is an interesting device as a Wifi / BLE gateway, but I'm not sure if its any good as a standalone BLE device, but ts probably not intended for pure BLE applications.

I'm personally swamped with other things I need to do, so don't have even any ESP32's on order, let alone have any in my workshop

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leavesw
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Re: ESP32

Postby leavesw » Sun Feb 19, 2017 11:19 pm

I got mine "AI-Thinker" ESP32 modules several days ago - have not yet got the time to play with it.
Currently working on making a STM32L0 in between the UART of ESP32 and USB port as a CDC device - and then I will start on the ESP32 :)

It seems to be a pretty powerful chip though ^.^

Ollie
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Re: ESP32 - Widora Air

Postby Ollie » Tue Mar 21, 2017 11:02 pm

I have 6 different ESP32 development boards, and now I have found my favorite. It has similar appearance than the Teensy 3.5/3.6. It is just shorted and without the SD drive. It is made by www.widora.io.

Several weeks ago, I did order one from Taobao https://world.taobao.com/item/538209801368.htm. The price was good $13 and shipping cost $4 was reasonable. It has been in transit for few weeks and I should get it on next week.

Later, I did order one from Aliexpress and received the Widora Air version 5.0. All vendors are describing and showing the version 4.0 in their pages. The cheapest one is $19.40 plus $1.95 shipping with estimated delivery in 12 - 20 days. https://www.aliexpress.com/item/ESP32-ESP32-Bit-Widora-AIR-V4-0-Nodemcu-Development-Board-USB-Shield-Module-MCU-With-Pin/32802459122.html

Some of the boards have external antenna, but I have not done any serious testing yet. I need to do that because with the built-in antennas, the WiFI range and speed are not very good.

Very high on my wish list is a new motor controller from ST. The old one (Vnh2SP30) is very low cost and high performance, but available only for 5V world. With Blue Pill and ESP32, I need to use level shifters and that is awkward. In practice, I am "forced" to use Arduino Mega for projects with Vnh2SP30.


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