Full documentation of the PCB

EByte E32 tutorial

EByte E22 tutorial

EByte E220 tutorial

I start using STM32 microcontrollers, and I find they a superior quality. But I need some prototyping board to do my work faster.

So here is a prototype board to develop the LoRa application. As usual, I use EByte modules, and this board is fully compatible with E32, E22, and E220.

More information, BOM, and description on the relative article on the site.

STM32F1 pinout

As you can see in the pinout diagram, you can find more than one Serial interface. In this board, I add jumpers to select Serial1 (Tx -> PA9, Rx->PA10) and Serial2 (Tx -> PA2, and Rx->PA3) interface.

The selectable pins are also AUX, M0 and M1.

For AUX I put PA0 (or WAKE pin) and PA1, for M0 you can select B0 and B1, for M1 the B2 and B10.

You can also put M0 and M1 in fixed mode and select the static status in the DIP-switch.

PCB

As usual, I create a PCB that can be milled, so when I send It to the factory for production, I’m sure that it works correctly.

The design is quite simple, you can check the connection in the PCB schema:

Here is the default configuration and description

Configuration

Here is the standard configuration for the relative library

HardwareSerial Serial2(USART2);  // PA3 (RX) PA2 (TX)  LoRa_E32 e32ttl(&Serial2, PA0, PB0, PB10); // Serial2 AUX M0 M1