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Wio Terminal Chassis Battery(650mAh)

The Wio Terminal Battery Chassis is a must-have extension board for Wio-Terminal Dev Board as it provides an external power source for Wio Terminal to enhance its portability and compactness. It has a 650mAH rechargeable lithium polymer battery, battery charging/discharging status LED, 4 Grove Analog/Digital Ports, 1 Grove I2C Port, and 1 Grove UART Port, as well as the ABS enclosure for aesthetic and protection. There is also the same Raspberry Pi 40-pin compatible GPIO at the back of the Wio Terminal Battery Chassis for more add-ons!

The new version of the Wio Terminal Battery Chassis has added the Texas Instrument's BQ27441-G1A - self-calibrating, I2C-based fuel gauge for lithium polymer (LiPo) batteries which can be used to measures your battery's voltage to estimate its charge percentage and remaining capacity!

Feature¶

Built-in 650mAh Rechargeable Lithium Polymer Battery
Battery charging/discharging status LED
Battery On/OFF Button
Built-in BQ27441-G1A fuel gauge for LiPo batteries
USB Type-C Charging
Overcurrent protection
Hiccup mode/Hiccup Protection
4 x Grove Analog/Digital Port
1 x Grove I2C Port
1 x Grove UART Port
Magnets are hidden inside the enclosure so that it can be stuck on the Whiteboard!

Specification¶

Item	Detail
Power Supply	4.75V - 5.25V
Built-in battery	650mAh
Charging current	Max: 660mA
battery board mode	Green LED: Light On is mean the board charing. Red LED: Light on is mean the OTG(battery discharge) enable. Yellow LED: Light on is mean the male interface output/input 5V.
GPIO output	Max voltage: 5.15V Max current: 380mA
Trickle charge current	30mA
Grove Interface	Grove Analog/Digital * 4, Grove I2C * 1, Grove UART * 1

Hardware Overview¶

Precautions¶

If the battery is removed while the board is in charge mode, the board will switch to failure mode and the green light blink at a frequency of 1Hz.
When the battery board is not in use, please press the button to enter sleep mode and all the LED will off.

Detecting LiPo Battery Status¶

Visit the SparkFun_BQ27441_Arduino_Library repositories and download the entire repo to your local drive.
Now, the library can be installed to the Arduino IDE. Open the Arduino IDE, and click sketch -> Include Library -> Add .ZIP Library, and choose the SparkFun_BQ27441_Arduino_Library file that you've have just downloaded.

InstallLibrary

Example Code¶

You may use the following code to read stats from your battery chassis.

#include <SparkFunBQ27441.h>
#include"TFT_eSPI.h"

TFT_eSPI tft;
TFT_eSprite spr = TFT_eSprite(&tft);  // Sprite
#define FF17 &FreeSans9pt7b

const unsigned int BATTERY_CAPACITY = 650; // Set Wio Terminal Battery's Capacity 

void setupBQ27441(void)
{
  // Use lipo.begin() to initialize the BQ27441-G1A and confirm that it's
  // connected and communicating.
  if (!lipo.begin()) // begin() will return true if communication is successful
  {
  // If communication fails, print an error message and loop forever.
    Serial.println("Error: Unable to communicate with BQ27441.");
    Serial.println("  Check wiring and try again.");
    Serial.println("  (Battery must be plugged into Battery Babysitter!)");
    tft.setTextColor(TFT_RED);
    tft.setCursor((320 - tft.textWidth("Battery Not Initialised!"))/2, 120);
    tft.print("Battery Not Initialised!");
    while (1) ;
  }
  Serial.println("Connected to BQ27441!");

  // Uset lipo.setCapacity(BATTERY_CAPACITY) to set the design capacity
  // of your battery.
  lipo.setCapacity(BATTERY_CAPACITY);
}

void printBatteryStats()
{
  // Read battery stats from the BQ27441-G1A
  unsigned int soc = lipo.soc();  // Read state-of-charge (%)
  unsigned int volts = lipo.voltage(); // Read battery voltage (mV)
  int current = lipo.current(AVG); // Read average current (mA)
  unsigned int fullCapacity = lipo.capacity(FULL); // Read full capacity (mAh)
  unsigned int capacity = lipo.capacity(REMAIN); // Read remaining capacity (mAh)
  int power = lipo.power(); // Read average power draw (mW)
  int health = lipo.soh(); // Read state-of-health (%)

  // Now print out those values:
  String toPrint = String(soc) + "% | ";
  toPrint += String(volts) + " mV | ";
  toPrint += String(current) + " mA | ";
  toPrint += String(capacity) + " / ";
  toPrint += String(fullCapacity) + " mAh | ";
  toPrint += String(power) + " mW | ";
  toPrint += String(health) + "%";

  Serial.println(toPrint);

  // LCD Graphics
  tft.setTextColor(TFT_BLUE);
  tft.drawRoundRect(10, 10, 300, 220, 10, TFT_BLUE);
  tft.setTextColor(TFT_MAGENTA);
  tft.drawString("State of Chage:", 20, 30);
  tft.drawString("Battery Voltage:", 20, 55);
  tft.drawString("Average Current:", 20, 80);
  tft.drawString("Remain Capacity:", 20, 105);
  tft.drawString("Full Capacity:", 20, 130);
  tft.drawString("Average Power:", 20, 155);
  tft.drawString("State of Health:", 20, 180);

  // Data
  spr.createSprite(80, 170);
  spr.fillSprite(TFT_BLACK);
  spr.setFreeFont(FF17);
  spr.setTextColor(TFT_WHITE);
  spr.drawString(String(soc)+" % ", 0, 0);
  spr.drawString(String(volts)+" mV ", 0, 25);
  spr.drawString(String(current)+" mA ", 0, 50);
  spr.drawString(String(capacity)+" mAh ", 0, 75);
  spr.drawString(String(fullCapacity)+" mAh ", 0, 100);
  spr.drawString(String(power)+" mW ", 0, 125);
  spr.drawString(String(health)+" % ", 0, 150);
  spr.pushSprite(170, 30);
  spr.deleteSprite();
}

void setup()
{
  Serial.begin(115200);
  tft.begin();
  tft.setRotation(3);
  tft.fillScreen(TFT_BLACK);
  tft.setFreeFont(FF17); 
  setupBQ27441();
  tft.setTextColor(TFT_GREEN);
  tft.setCursor((320 - tft.textWidth("Battery Initialised!"))/2, 120);
  tft.print("Battery Initialised!");
  delay(1000);
  tft.fillScreen(TFT_BLACK);
}

void loop() 
{
  printBatteryStats();
  delay(1000);
}

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