About
This device is similar to the Heltec WiFi Kit 32 (ESP32 mit kleinem OLED) but for doing LoRa, it also carries a Semtech SX127x chip.
Technical Specification
| source | parameter |
|---|---|
| MCU | ESP32 ( 240MHz Tensilica LX6 dual-core + 1 ULP 600 DMIPS 520KB SRAM Wi-Fi dual mode Bluetooth) |
| LoRa chip | SX1276 (868 and 915 version) SX1278 (433 and 470 version) |
| LoRa bands | EU_433 CN_470_510 EU_863_870 US_902_928 four bands optional |
| LoRa maximum output power | 18dB ± 2dB |
| Hardware resources | UART x 3 SPI x 2 I2C x 2 I2S x 1 12 – bits ADC 8 – bits DAC 29 general GPIO |
| Display | 0.96 inch 128*64 OLED display |
| FLASH | 8MB(64M-bits) SPI FLASH |
| Interface | Micro USB x 1 LoRa antenna interface(IPEX) x 1 |
| Size | 50.2 x 25.5 x 9.74 mm |
| USB to UART Bridge | CP2102 |
| Battery Type | 3.7V Lithium（SH1.25 x 2） |
| Battery detection circuit | √ |
| External device power control（Vext) | √ |
| Low power design | Deep Sleep 800uA |
Similar to
Heltec WiFi Kit 32 (ESP32 mit kleinem OLED) with Lora.
Links
- The device has already been mentioned at [LoRaWAN/TTN] Hardware / Software Options to build a Gateway - #7 by permagriculture.
- Alan did quite some experiments with MicroPython and LoRaWAN (TTN), see LoRa-Wan Kenobi.
Documentation and other resources
Schematics
- v2 868-915 Mhz WIFI_LoRa_32_V2(868-915).PDF (132.8 KB)
- v1 868-915 Mhz WIFI_LoRa_32(868-915version)Schematic_diagram.PDF (144.0 KB)
- other bands: http://resource.heltec.cn/download/WiFi_LoRa_32/
Pinouts
- v2 WIFI_LoRa_32_V2.pdf (247.8 KB)
- v1 WIFI_LoRa_32_V1.pdf (267.7 KB)
