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tbeampower's Introduction

TTGO T-Beam Power Control Library

Lilygo released V8 of the TTGO T-Beam board in August 2019. This rework included several changes mainly targetted at reducing power consumption by using integrating the AXP192 power controller IC. A list of the changes is as follows:

  1. User button Pin GPIO39 pin is replaced with GPIO38
  2. Replace the charging IC (TP5400) with the power management AXP192
  3. GPS TX (12), RX (34) pin replacement
  4. Power on switch removed and replaced with push button
  5. Reduced sleep current
  6. GPS battery replacement

The AXP193 controls the board's power domains and has 4 linear voltage regulators (LDO) and 3 Buck DC-DC converters.

  • DCDC1 powers OLED if installed
  • DCDC2 not connected
  • DCDC3 now controls the 3.3v to the board and to header 2 Pin7 & pin11
  • LDO2 provides LoRa power
  • LDO3 provides GPS power
  • AXP Charge Led replaces Led on GPIO

Schematic

https://github.com/Xinyuan-LilyGO/TTGO-T-Beam

Power Consumption

Experiments indicate that

Mode Pwer (mA)
Deep sleep 5.3
GPS and LoRa powered off 42mA
GPS and LoRa powered on 44mA
Blue LED charge light +20mA

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tbeampower's Issues

Not receiving nor sending

Hi, great work! I enjoyed reading your code.

For some reason, i cannot manage to send/receive lora datas between a TBeam and a Lora32 Oled v2.
I posted an issue here: Xinyuan-LilyGO/LilyGo-LoRa-Series#18.

The receiver (lora32 oled) uses the sketch found here: https://randomnerdtutorials.com/ttgo-lora32-sx1276-arduino-ide/

The TBeam's code is below, and nothing is received on the lora32 (whereas, when i try with 2 lora32, one sender and one receiver, everything works perfectly fine).

My hypothesis are:
Am i missing something with Lora ? Two different devices cannot send/receive from each other ? Or is my code wrong somehow ? Or do i have a hardware problem ?


#include <Arduino.h>
#include <SPI.h>
#include <LoRa.h>         // https://github.com/sandeepmistry/arduino-LoRa/blob/master/API.md
#include "gps.h"
#include "TBeamPower.h"

TBeamPower power(PWRSDA, PWRSCL); //21 22

void setupSerial() { 
  Serial.println();
  power.print_wakeup_reason();
}

void setup() {

  Serial.begin(115200);
  while (!Serial);

  Serial.println("Power begin");
  power.begin();

  Serial.println("All sensors off");
  power.power_sensors(false);

  Serial.println("All peripherals off");
  power.power_peripherals(false);

  Serial.println("Powering LoRa");
  power.power_LoRa(true);

  SPI.begin(SCK,MISO,MOSI,SS); //5 19 27 18
  LoRa.setPins(SS,RST,DI0); //18 14 26

  if (!LoRa.begin(BAND)) { //868E6 (France)
    Serial.println("Starting LoRa failed!");
    while (1);
  }else{
    Serial.println("Starting LoRa succeed!");
  }

  Serial.println();
}

void loop() {
  power.led_onoff(true);
  delay(500);
  power.led_onoff(false);

  LoRa.beginPacket();
  LoRa.print("hello");  
  LoRa.endPacket();
  Serial.println("sent..");
  power.print_status();
  Serial.println();
  delay(2000);  
}

And here is the output i get

Power begin
AXP192 Begin PASS
All sensors off
All peripherals off
Powering LoRa
Starting LoRa succeed!

sent..
Voltages:
         DCDC1: 3.30v
         DCDC2: 1.25v
         DCDC3: 3.30v
         LDO2: 3.30v
         LDO3: 2.80v
ChargeCurrent:   0.70A
IPSOUTVoltage:   3.57v
Temp:            15.94°C
TSTemp:          800.00
VbusCurrent:     0.00
VbusVoltage:     0.00
Battery:
         Connected: false
         Charging:  false
         ChargEN :  true
         Voltage:   0.00v
         Inpower:   0.00
         DischgCur: 0.00
         ChargeCur: 0.00

I even tried to change the antenna.
I also tried to make the TBeam as receiver, and nothing arrived.

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