We bring you the 4th iteration of WiFi LoRa 32

The next board in the Heltec WiFi LoRa 32 series is already the 4th version of this product. It brings a lot of changes compared to []WiFi LoRa 32 V3](/products/2216).

The heart of the board is still the ESP32-S3 processor, but it has been changed to the S3R2 version. This means that you have 2 MB of PSRAM (accessible via QSPI) at your disposal (in addition to the standard SRAM). It is slightly slower than the memory built directly into the ESP32 chip, but these 2 MB are great for larger data/buffers.

The radio chip is SX1262 (as in V3) but… this is the High Power version - the transmission power is as high as 28 dBm! Needless to say, each additional dBm means that the module can be used in more situations (but be careful not to exceed the permitted transmission power for the entire transmission path).

Another important change is the OLED display module. More specifically, its mounting. This time, in the V4 version, the OLED itself is covered with a transparent cover and shielded by a housing. It is clear to every maker that this solution is more resistant to mechanical damage. When testing your projects, if you don’t have a casing for it right away, you don’t have to be so careful not to damage the screen. The screen casing also has an integrated 2.4GHz antenna, thanks to which the spring that was the 2.4 GHz antenna in previous versions has “disappeared.” The whole thing has gained visually from this change.

The battery options has also been significantly improved. Previous versions offered a “standard” LiPo battery charging circuit, while the V4 version has a circuit that is also adapted to work with small solar panels, so you can now connect the V4 directly to the panel. Operating the module in locations far from the power grid has become even easier. At the bottom of the board there are two SH1.25 connectors - one for the LiPo battery, the other for connecting the panel.

Looking at the bottom of the PCB, a larger 8-pin connector also catches the eye. Yes, this is a connector for connecting a GPS module!

Changes, changes, changes!

As you can see, there are quite a few changes, which is why Heltec promises that versions V3 and V4 will be available in parallel for the time being. The pinout of both modules is compatible (v4 has 4 additional pins, but they are on one of the shorter sides, so the layout and functionality of the main pins in both versions is identical), but the changes in the screen mounting and additional connectors (solar panel, GPS) mean that the boards are not fully equivalent. Therefore, both versions will be available for the time being.

Remember, before connecting the power supply to the module, connect the antenna (included with the module) to the LoRa track. If you do not do this, there is a chance that you will damage the LoRa radio module.

• Manufacturer: Heltec
• Processor: ESP32-S3R2
  • Two 240 MHz cores
  • WiFi up to 150Mbps 802.11 b/g/n/e/i
  • Bluetooth (LE), Bluetooth 5, Bluetooth Mesh
  • Flash: 16MB (external)
  • PSRAM memory 2MB (QSPI)
• Radio: Semtech SX1262
• External antenna connector: IPX (U.FL) (antenna included with the module)
• OLED screen:
  • Diagonal: 0.96”
  • Controller: SSD1306
  • Resolution: 128x64 px
• Built-in Li-Ion/Li-Po battery charging circuit with the option of solar panel power supply
• USB C connector
• Battery connector: 2-pin 1.25 mm pitch (<a href=”##ZAS-2135”##>dedicated SH1.25 cable</a>)

Set includes:

• Heltec WiFi LoRa 32 module
• 2 goldpin ladders + 2 x two goldpins
• 868MHz antenna (<a href=”##AKC-2115”##>spring type</a>)
• 2 x cable with JST connector for connecting battery/solar panel power supply

ESP8266 / ESP32 modules

Dev boards ESP8266 / ESP32

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