Difference: TheHardware (9 vs. 10)

Revision 102020-07-12 - UliRaich

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META TOPICPARENT	name="WebHome"

The Hardware

The CPU card

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While the ESP32-wroom-32 uses GPIO 2 for its on-board user LED the ESP32-wrover-b uses GPIO 19.

The ESP32-wrover-b has a design flaw: GPIO 16 connected to pin D3 and GPIO 17 connected to pin D4 cannot be used to control sensors because these GPIO lines are used to control the PSRAM. This means that the CPU is incompatible with any shield using pins D3 and D4. Other GPIO lines should have been made available instead.

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Checking the hardware table below shows that only the push button shield (D3) and the DHT11 (D4) use the forbidden pins. I therefore made hardware patches to connect their forbidden pins to D1.

The patches pus button shield	The patched DHT11 shield

The Base Board

This board has no active elements but it connects sensor shields to the CPU board. Like this the necessary connections are made in a Lego based manner by just plugging modules together without any further cable connections or soldering.

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Module	Connections	GPIO on ESP8266	GPIO on ESP32	Functionality
PSRAM	D3 D4		GPIO 17 GPIO 16	used by PSRAM on WROVER cannot be used by shields

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1 button shield

GPIO 0

GPIO 17

on / off push button

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1 button shield

D3
patched to D1

GPIO 0
patched to GPIO 5

GPIO 17
patched to GPIO 22

on / off push button

WS2812B RGB shield	D2	GPIO 4	GPIO 21	addressable rgb LED
WS2812B RGB ring	D0	GPIO 16	GPIO 26	7 LED WS2812 ring
DS1307 RTC and data logger	D1 D2 D5 D6 D7 D8	GPIO 5 I2C SCL GPIO 4 I2C SDA GPIO 14 SPI Clock GPIO 12 SPI MOSI GPIO 13 SPI MISO GPIO 15 SPI CS	GPIO 22 I2C SCL GPIO 21 I2C SDA GPIO 18 SPI clock GPIO 19 SPI MOSI GPIO 23 SPI MISO GPIO 5 SPI CS	Real Time Clock SD card interface
Buzzer shield	D5 D6 D7 D8	GPIO 14 (default) GPIO 12 GPIO 13 GPIO15	GPIO 18 (default) GPIO 19 GPIO 23 GPIO 5	passive buzzer
BMP180 shield	D1 D2	GPIO 5 I2C SCL GPIO 4 I2C SDA	GPIO 22 I2C SCL GPIO 21 I2C SDA	I2C barometric pressure sensor and temperature sensor

Changed:

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DHT11 shield

GPIO 2

GPIO 16

temperature and humidity sensor

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DHT11 shield

D4
patched to D1

GPIO 2
patched to GPIO 5

GPIO 16
patched to GPIO 22

temperature and humidity sensor

OLED shield	D1 D2	GPIO 5 I2C SCL GPIO 4 I2C SDA	GPIO 22 I2C SCL GPIO 21 I2C SDA	64x48 pixel display with SSD1036 I2C controller
TFT shield	D0 D8	GPIO 16 CS GPIO 15 DC	GPIO 26 CS GPIO 5 DC	128x128 pixel display with ST7735 SPI controller
DS18B20 shield	D2	GPIO 4	GPIO 21	1-wire digital temperature sensor

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META FILEATTACHMENT	attachment="wrover.png" attr="" comment="" date="1594538242" name="wrover.png" path="wrover.png" size="256781" user="UliRaich" version="1"
META FILEATTACHMENT	attachment="esp32V1.png" attr="" comment="" date="1594538935" name="esp32V1.png" path="esp32V1.png" size="246295" user="UliRaich" version="1"
META FILEATTACHMENT	attachment="esp32-wrover-b_datasheet_en.pdf" attr="" comment="" date="1594539210" name="esp32-wrover-b_datasheet_en.pdf" path="esp32-wrover-b_datasheet_en.pdf" size="520362" user="UliRaich" version="1"

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META FILEATTACHMENT	attachment="pushbuttonMod.png" attr="" comment="" date="1594579032" name="pushbuttonMod.png" path="pushbuttonMod.png" size="229955" user="UliRaich" version="1"
META FILEATTACHMENT	attachment="dht11Mod.png" attr="" comment="" date="1594579032" name="dht11Mod.png" path="dht11Mod.png" size="235975" user="UliRaich" version="1"

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