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E77 EBYTE LoRaWAN Development Board

Overview

## Project Introduction
**This project is based on the development board designed by E77-400M22S module produced by Ebyte. The development board designed in this project meets daily testing needs. E77-400M22S is based on ST's newly launched STM32WLE5CCU6 (ARM Cortex-M4 + LoRa) SoC wireless communication module, with long communication distance, low standby power consumption, strong anti-interference ability, rich interface resources, strong processing ability, small size and other characteristics. It is also suitable for 433/470MHz frequency band SMD LoRa wireless module, using industrial-grade high-precision 32.768KHz and 32MHz crystal oscillators. **
**Official website of the module:**[https://www.ebyte.com/product-view-news.html?id=1890](https://www.ebyte.com/product-view-news.html?id=1890)

### Module parameters
![e77.png]

## Project features1

. The E77 development board has brought out each pin for easy use.
2. Add three user LED lights and a power indicator light.
3. Add two user buttons and a reset button.
4. This project can use the TYPE-C interface for power supply, and the external terminal can be used to download the program and test the serial port.
5. This project uses PA13 PA14 as the SWD download program mode, and PB6 PB7 as the serial port 1 output.
6. The development board has built-in self-recovery fuses and voltage regulator diodes for circuit protection.
7. The AMS1117 power chip is used for stable power supply, and the package is SOT89, which is small and exquisite and does not take up space.
8. You can choose the RF antenna, which can be connected through the module's own IPEX interface or soldered SMA antenna seat. (The soldering antenna seat needs to be soldered with a 16nH inductor for impedance matching)

## PCB design instructions
The E77-400M22S module itself has an IPEX antenna interface. If you use the onboard SMA antenna, you can solder a 16nH inductor for impedance matching. (Not verified yet, for reference only)
The RF impedance part is not designed according to 50om impedance matching, but it meets the basic requirements and can be welded with a 100pf capacitor. It is recommended to use the onboard IPEX antenna interface.

## Software Description

The following test programs are provided in the attachment download area (unchecked means they are being ported... :)
* [x] Blink_USART_Test
* [ ] E77_PingPPong_Test
* [ ] E77_LoRaWAN_Test

The software uses STM32CUBEMX configuration and HAL library to write code.
## Physical display

![IMG_5732.JPG]

![IMG_5733.JPG]

![IMG_5734.JPG]

![IMG_5730.JPG]

Design Files

All reference designs on this site are sourced from major semiconductor manufacturers or collected online for learning and research. The copyright belongs to the semiconductor manufacturer or the original author. If you believe that the reference design of this site infringes upon your relevant rights and interests, please send us a rights notice. As a neutral platform service provider, we will take measures to delete the relevant content in accordance with relevant laws after receiving the relevant notice from the rights holder. Please send relevant notifications to email: bbs_service@eeworld.com.cn.

It is your responsibility to test the circuit yourself and determine its suitability for you. EEWorld will not be liable for direct, indirect, special, incidental, consequential or punitive damages arising from any cause or anything connected to any reference design used.

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Update:2025-06-20 17:07:09

Giving out New Year’s Day and Christmas gifts (some good information and e-books I collected) — and sharing them at the same time! ! ! !
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