WeMos D1 (esp8266): HardwareSerial shield for Ebyte E32 E22 E220 LoRa devices

Renzo Mischianti

3 years ago

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EByte LoRa E32 TTL 100 Wemos D1 shield PCB main page.

I created a library for the EByte LoRa device and also a shield. However, when I used it in another project I had the problem of the reduced number of pins since 2 were used by the SoftwareSerial. To solve these problems I switched to HardwareSerial. The amps could be insufficient so I add a voltage regulator to power the EByte e32 in one and in the other shield directly from the 5v.

sx1278 sx1276 wireless lora uart module serial 3000m arduino 433 rf

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SoftwareSerial shield

So this shield is quite different from one shown on “LoRa E32 device for Arduino, esp32 or esp8266: WOR (wake on radio) microcontroller and new WeMos D1 mini shield” the previous schema is this

LoRa E32-TTL-100 and Wemos D1 fully connected shield old version

And the result is

WeMos D1 mini shield photo UP with description

WeMos LoRa shield with SoftwareSerial PCBWay

HardwareSerial shield with 3.3v voltage regulator

The new shield is similar to the previous one, but has more functionality, but has the 3.3v limit for powering the LoRa device, thereby limiting its power.

EByte LoRa E32 Wemos D1 shield to hardwareserial

As you can see now, there is a voltage regulator to power the e32 device, and RX, TX is connected to TX and RX of microcontroller, a pin is free to connect Serial to USB to debug on Serial1.

So the PCB schema become so

EByte LoRa E32 Wemos D1 shield PCB to hardware serial

More complex and with more pins and buttons, now AUX, M0, and M1 are selectable, and you have two options for every e32 input.

Here is the milled prototype.

EByte LoRa E32 Wemos D1 shield PCB milled.

And here are all the options

EByte LoRa E32 Wemos D1 shield PCB up description

Here the BOM

N°	Object	Desc
2	Electrolytic Capacitor	capacitance 10µF
2	Generic female header – 8 pins	2.54mm ♀
1	Generic female header – 7 pins	2.54mm ♀
7	Generic male header – 2 pins	2.54mm ♂
3	Generic male header – 3 pins	2.54mm ♂
1	DIP SWITCH	package dipswitch-03; channels 1
1	Lora E32	voltage 3-5V; type Basic
3	4.7kΩ Resistor
2	10kΩ Resistor
1	LD1117V33	package 78xxl; voltage regulator 3.3V; chip LD1117VXX
1	WeMos D1 Mini	CPU ESP-8266EX

You can find WeMos D1 on WeMos D1 mini - NodeMCU V2 V2.1 V3 - esp01 - esp01 programmer

You can find EBYTE e32 devices on AliExpress (433MHz 5Km) - AliExpress (433MHz 8Km) - AliExpress (433MHz 16Km) - AliExpress (868MHz 915MHz 5.5Km) - AliExpress (868MHz 915MHz 8Km)

You can find 3.3v voltage regulator on AliExpress SMD (AMS1117) - AliExpress 3.3v (LM1117) - AliExpress 5v (7805) - AliExpress 9v (7809)AliExpress 12v (7812) - AliExpress 3.3v TO-92 (78L33)

You can find dip switch on AliExpress

Soldering video

Get the PCB.

WeMos LoRa shield with 3.3v voltage regulator PCBWay

HardwareSerial shield 5v version

After a while, I understand that to have a good range, I need to power the LoRa device with 5v, and I redò the shield like the photo.

EByte LoRa Exx Wemos D1 shield PCB up with 5v 3v3 switch

The soldering steps are the same, but I remove the voltage regulator and add a 3.3V switch to the 5V USB power supply.

Here is the list of parts.

N°	Object	Desc
2	Generic female header – 8 pins	2.54mm ♀
1	Generic female header – 7 pins	2.54mm ♀
7	Generic male header – 2 pins	2.54mm ♂
3	Generic male header – 3 pins	2.54mm ♂
1	DIP SWITCH	package dipswitch-03; channels 1
1	Lora E32	voltage 3-5V; type Basic
3	4.7kΩ Resistor
2	10kΩ Resistor
1	WeMos D1 Mini	CPU ESP-8266EX

You can find WeMos D1 on WeMos D1 mini - NodeMCU V2 V2.1 V3 - esp01 - esp01 programmer

You can find EBYTE e32 devices on AliExpress (433MHz 5Km) - AliExpress (433MHz 8Km) - AliExpress (433MHz 16Km) - AliExpress (868MHz 915MHz 5.5Km) - AliExpress (868MHz 915MHz 8Km) You can find dip switch on AliExpress

And here is the final result.

EByte LoRa Exx Wemos D1 shield PCB 3v3 5v switch

Get the PCB.

WeMos LoRa shield with 3.3v and 5v switch PCBWay

Example

An example of a configuration of the shield is

LoRa_E32 e32ttl(&Serial, D3, D0, D8);

But remember, AUX with a change jumper can take D3 or D6 pins, M0 can be D0 or D5, M1 can be D8 or D7.

Here is a simple sketch to retrieve the device’s configuration; refer to the full tutorial of the library for more detail on “LoRa e32 devices“.

/*
 * LoRa E32-TTL-100
 * Get configuration.
 * https://mischianti.org
 *
 */
#include "Arduino.h"
#include "LoRa_E32.h"

LoRa_E32 e32ttl(&Serial, D3, D0, D8);

void printParameters(struct Configuration configuration);
void printModuleInformation(struct ModuleInformation moduleInformation);

void setup() {
	Serial.begin(9600);
	delay(500);

	// Startup all pins and UART
	e32ttl100.begin();

	ResponseStructContainer c;
	c = e32ttl100.getConfiguration();
	// It's important get configuration pointer before all other operation
	Configuration configuration = *(Configuration*) c.data;
	Serial.println(c.status.getResponseDescription());
	Serial.println(c.status.code);

	printParameters(configuration);

	ResponseStructContainer cMi;
	cMi = e32ttl100.getModuleInformation();
	// It's important get information pointer before all other operation
	ModuleInformation mi = *(ModuleInformation*)cMi.data;

	Serial.println(cMi.status.getResponseDescription());
	Serial.println(cMi.status.code);

	printModuleInformation(mi);
}

void loop() {

}
void printParameters(struct Configuration configuration) {
	Serial.println("----------------------------------------");

	Serial.print(F("HEAD BIN: "));  Serial.print(configuration.HEAD, BIN);Serial.print(" ");Serial.print(configuration.HEAD, DEC);Serial.print(" ");Serial.println(configuration.HEAD, HEX);
	Serial.println(F(" "));
	Serial.print(F("AddH BIN: "));  Serial.println(configuration.ADDH, BIN);
	Serial.print(F("AddL BIN: "));  Serial.println(configuration.ADDL, BIN);
	Serial.print(F("Chan BIN: "));  Serial.print(configuration.CHAN, DEC); Serial.print(" -> "); Serial.println(configuration.getChannelDescription());
	Serial.println(F(" "));
	Serial.print(F("SpeedParityBit BIN    : "));  Serial.print(configuration.SPED.uartParity, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTParityDescription());
	Serial.print(F("SpeedUARTDataRate BIN : "));  Serial.print(configuration.SPED.uartBaudRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getUARTBaudRate());
	Serial.print(F("SpeedAirDataRate BIN  : "));  Serial.print(configuration.SPED.airDataRate, BIN);Serial.print(" -> "); Serial.println(configuration.SPED.getAirDataRate());

	Serial.print(F("OptionTrans BIN       : "));  Serial.print(configuration.OPTION.fixedTransmission, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFixedTransmissionDescription());
	Serial.print(F("OptionPullup BIN      : "));  Serial.print(configuration.OPTION.ioDriveMode, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getIODroveModeDescription());
	Serial.print(F("OptionWakeup BIN      : "));  Serial.print(configuration.OPTION.wirelessWakeupTime, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getWirelessWakeUPTimeDescription());
	Serial.print(F("OptionFEC BIN         : "));  Serial.print(configuration.OPTION.fec, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getFECDescription());
	Serial.print(F("OptionPower BIN       : "));  Serial.print(configuration.OPTION.transmissionPower, BIN);Serial.print(" -> "); Serial.println(configuration.OPTION.getTransmissionPowerDescription());

	Serial.println("----------------------------------------");

}
void printModuleInformation(struct ModuleInformation moduleInformation) {
	Serial.println("----------------------------------------");
	Serial.print(F("HEAD BIN: "));  Serial.print(moduleInformation.HEAD, BIN);Serial.print(" ");Serial.print(moduleInformation.HEAD, DEC);Serial.print(" ");Serial.println(moduleInformation.HEAD, HEX);

	Serial.print(F("Model no.: "));  Serial.println(moduleInformation.model, HEX);
	Serial.print(F("Version  : "));  Serial.println(moduleInformation.version, HEX);
	Serial.print(F("Features : "));  Serial.println(moduleInformation.features, HEX);
	Serial.println("----------------------------------------");
}

Thanks

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