Espressif
Documentatie Espressif microcontrollers

ESP32
De ESP32 is een budgetserie van laag-vermogen microcontrollers met geïntegreerde Wi-Fi en dual-mode Bluetooth. De ESP32-serie maakt gebruik van een Tensilica Xtensa LX6- microprocessor in zowel dual-core als single-core uitvoering. De ESP32 is gemaakt en ontwikkeld door Espressif Systems, een in Shanghai gevestigd Chinees bedrijf, en wordt vervaardigd door TSMC met behulp van hun 40nm-proces. Het is een opvolger van de ESP8266 microcontroller. Deze microcontroller is erg populair bij hobbyisten voor het ontwikkelen van Internet of things applicaties. 
 De ESP32 is verkrijgbaar in diverse uitvoeringen. Zelf heb ik een ESP32 Wroom 32D (38 pins) aangeschaft om mee te experimenteren. 
 
 
 Pin bezetting ESP32 Wroom 32 (38 pins) 
 
 
 
 ESP32-WROOM-32 (ESP-WROOM-32) Pin Configuration 
 
 
 
 
 Pin Category 
 Pin Name 
 Details 
 
 
 Power 
 Micro-USB, 3.3V, 5V,   GND 
 Micro-USB:  ESP32 can be powered through USB port 5V:  Regulated 5V can be supplied to this pin which is we be again regulated to 3.3V by on board regulator, to power the board. 3.3V:  Regulated 3.3V can be supplied to this pin to power the board. GND:  Ground pins. 
 
 
 Enable 
 En 
 The pin and the button resets the microcontroller. 
 
 
 Analog Pins 
 ADC1_0 to ADC1_5 and ADC2_0 to ADC2_9 
 Used to measure analog voltage in the range of 0-3.3V.12-bit 18 Channel ADC 
 
 
 DAC pins 
 DAC1 and DAC2 
 Used for Digital to analog Conversion 
 
 
 Input/output Pins 
 GPIO0 to GPIO39 
 Totally 39 GPIO pins, can be used as input or output pins. 0V (low) and 3.3V (high). But pins 34 to 39 can be used as input only 
 
 
 Capacitive Touch pins 
 T0 to T9 
 These 10 pins can be used a touch pins normally used for capacitive pads 
 
 
 RTC GPIO pins 
 RTCIO0 to RTCIO17 
 These 18 GPIO pins can be used to wake up the ESP32 from deep sleep mode. 
 
 
 Serial 
 Rx,  Tx 
 Used to receive and transmit TTL serial data. 
 
 
 External Interrupts 
 All GPIO 
 Any GPIO can be use to trigger an interrupt. 
 
 
 
 
 
 
 
 
 PWM 
 All GPIO 
 16 independent channel is available for PWM any GPIO can be made to work as PWM though software 
 
 
 VSPI 
 GPIO23 (MOSI), GPIO19(MISO), GPIO18(CLK) and GPIO5 (CS) 
 Used for SPI-1 communication. 
 
 
 HSPI 
 GPIO13 (MOSI), GPIO12(MISO), GPIO14(CLK) and GPIO15 (CS) 
 Used for SPI-2 communication. 
 
 
 IIC 
 GPIO21(SDA), GPIO22(SCL) 
 Used for I2C communication. 
 
 
 AREF 
 AREF 
 To provide reference voltage for input voltage. 
 
 
 
 
 ESP32-WROOM-32 (ESP-WROOM-32) Technical features 
 
 
 
 
 Microprocessor 
 Tensilica Xtensa LX6 
 
 
 Maximum Operating Frequency 
 240MHz 
 
 
 Operating Voltage 
 3.3V 
 
 
 Analog Input Pins 
 12-bit, 18 Channel 
 
 
 DAC Pins 
 8-bit, 2 Channel 
 
 
 Digital I/O Pins 
 39 (of which 34 is normal GPIO pin) 
 
 
 DC Current on I/O Pins 
 40 mA 
 
 
 DC Current on 3.3V Pin 
 50 mA 
 
 
 SRAM 
 520 KB 
 
 
 Communication 
 SPI(4), I2C(2), I2S(2), CAN, UART(3) 
 
 
 Wi-Fi 
 802.11 b/g/n 
 
 
 Bluetooth 
 V4.2 – Supports BLE and Classic Bluetooth 
 
 
 
 
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ESP8266 (ESP01, ESP01-S)
De ESP8266 is een goedkope microprocessor met Wi-Fi mogelijkheid en een volledige TCP/IP stack. De ESP8266 is ontwikkeld en wordt geproduceerd door de Chinese fabrikant Espressif Systems uit Shanghai. 
 
 
   
 ESP8266 Pin Configuration 
 
 
 
 
 Pin Number 
 Pin Name 
 Alternate Name 
 Normally used for 
 Alternate purpose 
 
 
 1 
 Ground 
 – 
 Connected to the ground of the circuit 
 – 
 
 
 2 
 TX 
 GPIO – 1 
 Connected to Rx pin of programmer/uC  to upload program 
 Can act as a General purpose Input/output pin when not used as TX 
 
 
 3 
 GPIO-2 
 – 
 General purpose Input/output pin 
 – 
 
 
 4 
 CH_EN 
 – 
 Chip Enable – Active high 
 – 
 
 
 5 
 GPIO – 0 
 Flash 
 General purpose Input/output pin 
 Takes module into serial programming when held low during start up 
 
 
 6 
 Reset 
 – 
 Resets the module 
 – 
 
 
 7 
 RX 
 GPIO – 3 
 General purpose Input/output pin 
 Can act as a General purpose Input/output pin when not used as RX 
 
 
 8 
 Vcc 
 – 
 Connect to +3.3V only 
   
 
 
 
 Pin Configuration 
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