Heltec WiFi LoRa 32 Development Board Pinout and Technical Specifications
Code name: heltec_wifi_lora_32
Heltec WiFi LoRa 32 development board is based on esp32 microcontroller and uses xtensa architecture. This development board has a maximum CPU frequency of 240 MHz and a flash size of 4MB.
Features
- 40 digital IO pins
- 16 external interrupt pins
- 16 analog input pins
- 19 PWM pins
Connectivity
- WiFi: 802.11 b/g/n (2.4 GHz)
- Bluetooth: 4.2
- WiFi: 4.2
Technical specs
| Clock Speed | 240 MHz |
| Flash size | 4MB |
| Microcontroller | esp32 |
| Architecture | xtensa |
Heltec WiFi LoRa 32 Pins Mapping Arduino IDE
Below you can find the Heltec WiFi LoRa 32 pinout. This development board provides 40 digital IO pins, out of which 16 can be used as an external interrupt pins , 16 as analog input pins and 19 pins have Pulse-Width Modulation (PWM) .
| Pin | Analog | Touch | PWM | Other |
|---|---|---|---|---|
| 0 | A11 | T1 | KEY_BUILTIN | |
| 1 | PWM | TX | ||
| 2 | A12 | T2 | PWM | |
| 3 | PWM | RX | ||
| 4 | A10 | T0 | PWM | SDA_OLED |
| 5 | PWM | SCK | ||
| 12 | A15 | T5 | PWM | |
| 13 | A14 | T4 | PWM | |
| 14 | A16 | T6 | PWM | RST_LoRa |
| 15 | A13 | T3 | PWM | SCL_OLED |
| 16 | PWM | RST_OLED | ||
| 18 | PWM | SS | ||
| 19 | PWM | MISO | ||
| 21 | PWM | SDA Vext | ||
| 22 | PWM | SCL | ||
| 25 | A18 | PWM | LED_BUILTIN DAC1 LED | |
| 26 | A19 | PWM | DAC2 DIO0 | |
| 27 | A17 | T7 | PWM | MOSI |
| 32 | A4 | T9 | PWM | DIO2 |
| 33 | A5 | T8 | PWM | DIO1 |
| 34 | A6 | |||
| 35 | A7 | |||
| 36 | A0 | |||
| 39 | A3 |
Default Tools
| Bootloader tool | esptool_py |
| Uploader tool | esptool_py |
| Network uploader tool | esp_ota |
| Bootloader address | 0x1000 |
| Flash mode | dio |
| Boot mode | dio |
| PSRAM type | |
| Maximum upload size | 1280 Kb (1310720 B) |
| Maximum data size | 320 Kb (327680 B) |
The Heltec WiFi LoRa 32 development board by default uses esptool_py uploader tool, esp_ota network uploader tool for Over-the-air (OTA) uploads and esptool_py bootloader tool. The bootloader starts at address "0x1000". Flash mode and boot mode for Heltec WiFi LoRa 32 development board by default is dio and dio respectively. When using Arduino IDE, the maximum sketch upload size is 1280 Kb (1310720 B) and maximum data size for variables is 320 Kb (327680 B).