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ESP32s with different functionalities
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README.md

ESP-Nodes

Eco-system of ESP32s Nodes and ATtiny85 peripherals with different functionalities.

The ESP32-Node is designed to be a low-cost, vanila solution for experimenting with embedded and IoT devices. The ESP32-Node is intended to College students taking Electronics program or advanced users who are looking for functional ESP32 embedded board with minimal size.

ESP32-Node PCB

ESP32-Node Features:

  • ESP32-WROOM-32D Module 1
  • Direct connections to all GPIOs
  • Miniature in size, only 35.7mm x 35.7mm
  • Built-in 3V3 voltage regulator (15V input max) and reversed supply voltage polarity protection
  • Pre-wired strapping pins for ensuring proper booting on power-on
  • blue power-on LED
  • two programmable LEDs
  • programmable via UART -> no need for serial drivers

ESP32-WROOM-32D Module Adapter Pinouts

The adapter allows interchangability of ESP32 modules between different nodes. The adapter contains minimal components on its PCB, just enough to ensure module's operation.

ESP32-Node Pinout
Physical Pin Descrption and Logical Pin Extended Function
1 15 38 Ground
2 3V3
3 EN
4 5 6 7 Inputs Only GPIO36 GPIO39 GPIO34 GPIO35 ADC1_CH0, ADC1_CH3, ADC1_CH6, ADC1_CH7
8 9 GPIO32 GPIO33 TOUCH_9, TOUCH_8
10 11 GPIO25 GPIO26 DAC_1, DAC_2
12 GPIO27 TOUCH_7
13 14 GPIO14 GPIO12 HSPI_CLK HSPI_MISO TOUCH_6 TOUCH_7
16 GPIO13 HSPI_MOSI ADC2_CH4
17 18 19 20 21 22 Module Internal Use Only GPIO09 GPIO10 GPIO11 GPIO08 GPIO07 GPIO06
23 24 GPIO02 GPIO15 AD2_CH3 ADC2_CH2
25 26 GPIO00 GPIO04 TOUCH_1 TOUCH_0
27 28 GPIO16 GPIO17 UART2_RXD UART2_TXD
29 30 31 GPIO05 GPIO18 GPIO19 VSPI_CS0 VSPI_CLK VSPI_MISO
32 Not Connected
33 GPIO21 SDA
34 35 GPIO03 GPIO01 UART0_RXD UART0_TXD
36 GPIO22 SCL
37 GPIO23 VSPI_MOSI

UART

Temperature Node Key Elements and Components

The Temperature Node broadcasts the air temperature, atmospheric pressure and air humidity over secured MQTT.

BME280

BME280: I2C Temperature, Pressure and Humidity Sensor