iv'e put together a three open sourced boards for some of my robot projects.The first just a breakout board for a few different modules the devKit C and few of the cheaper boards that are around brings out all the io to 3 pin headers to connect servos as well as the i2c spi and some anin pins.
the second second uses the wroom module with 16 servo ports 4 anin , i2c spi, 4 pin header with divider for an hc-sr04 and a ti audio amp connected to a dac pin and header for neopixel ring for my hexapod bot. waiting for the boards to arrive
the third which is on rev 2 as made a bit of a booboo on the second wroom enable pin has two wroom modules giving upto 32 servo pins , i2c hc-sr04, spi, and 1amp dual channel motor driver for my inmoov gerbers and schematics and bom can be downloaded from my site theres also a description of the board and put the pinouts up shotly http://www.esp32robots.co.uk
servo controller boards
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Espressif Systems is a fabless semiconductor company providing cutting-edge low power WiFi SoCs and wireless solutions for wireless communications and Internet of Things applications. ESP8266EX and ESP32 are some of our products.