Shahariar
Published © LGPL

Hacking Qualcomm (Quick Charge) QC 2.0/3.0 With ATtiny85

Get not only 5 volts but also 9, 12 volts (18 Watts max) out of any QC-compatible charger/power bank for supplying power hungry projects.

IntermediateFull instructions provided5 hours5,230
Hacking Qualcomm (Quick Charge) QC 2.0/3.0 With ATtiny85

Things used in this project

Hardware components

ATtiny85
Microchip ATtiny85
×1
SparkFun LM1117 3.3V Regulator
×1
SparkFun USB Male A
×1
Resistor 10k ohm
Resistor 10k ohm
×2
Resistor 2.21k ohm
Resistor 2.21k ohm
×1
Arduino Proto Shield
Arduino Proto Shield
×1
Pushbutton switch 12mm
SparkFun Pushbutton switch 12mm
×1
QC Power Bank or Charger
×1
Generic Jumper (0.1")
Generic Jumper (0.1")
×8
Male-Header 36 Position 1 Row- Long (0.1")
Male-Header 36 Position 1 Row- Long (0.1")
×1
Resistor 0.05 ohm
Resistor 0.05 ohm
×10
Arduino UNO & Genuino UNO
Arduino UNO & Genuino UNO
×1
Male/Female Jumper Wires
Male/Female Jumper Wires
×7
LED (generic)
LED (generic)
×1
Resistor 22.1k ohm
Resistor 22.1k ohm
×1

Software apps and online services

Arduino IDE
Arduino IDE

Hand tools and fabrication machines

Soldering iron (generic)
Soldering iron (generic)

Story

Read more

Schematics

QC Hack

https://circuits.io/circuits/5830928-qc-chargeing-hack
Qc controller corrected hrmyqg4lh2

Code

ATtiny85 Code

C/C++
QC Controller
///========================= Algorithm ========================/// 

/*
  First, Connect the D+ pin to a voltage 0.325 to 2 volts and keep the D- floating, then wait at least 2 seconds.

  Two actions happen during this 2 seconds:

  The D+ and D- voltage equal a voltage between 0.325 to 2 volts for 1.25 seconds.
  (because the D+ and D- pins connect together inside the CHY100 at first)

  Then the D+ keeps at a voltage between 0.325 to 2 volts and the D- voltage decrease to zero.
  (because the D+ and D- pins disconnect and a resistor inside the CHY100 discharges the D-)*** CHY100 is a QC 2.0 Protocol interface chip inside Power bank/charger ........ other QC 2.0 chips are probably similar 

  Make D+ above 3.0 V first and then connect the D- to a voltage between 0.325 to 2 volts. The VBUS jumps to 9V.

  While keeping the D- connection with a voltage between 0.325 to 2 volts,make D+  a voltage between 0.325 to 2 volts.
  The VBUS jumps to 12V. (because the D+ and D- voltage are between 2V and 0.325V)

  Disconnect the D+ from a voltage between 0.325 to 2 volts . VBUS jumps to 5V, Because the QC2.0 exits Voltage changing
  mode and VBUS goes to the default value 5V. start from beginning when needing to enter QC2.0 again)
*/
//  ============  IMPORTANT NOTE ================  //

// *** Sequence of making pins HIGH and LOW is important
// *** If D+ falls below 0.325V during transition because of wrong GPIO Switching Sequence
// *** QC 2.0 will exit High Voltage Mode and VBUS will go back to 5 Volts 

//  ==============================================  //

#define PUSH_SWITCH 0
#define Dp_2k2 4
#define Dp_10k 3
#define Dn_2k2 2
#define Dn_10k 1

int Press_Detect = 0;

void setup()
{
  pinMode(PUSH_SWITCH, INPUT_PULLUP);
  // Now Initiating QC Handshake by making D+ 0.6 v keeping D- at Gnd
  Init_QC();
}

void loop()
{
  //// 5V ////
  while (digitalRead(PUSH_SWITCH) == 1)
  {
  }
  delay(250);
  //// 9v ////
  Set_9V();
  while (digitalRead(PUSH_SWITCH) == 1)
  {
  }

  delay(250);
  //// 12v ////
  Set_12V();
  while (digitalRead(PUSH_SWITCH) == 1)
  {
  }
  delay(250);
//  Set_5V();
}



///********************** Functions **********************///

void Init_QC()
{
  //pinMode(Dn_2k2, INPUT);
  //pinMode(Dn_10k, INPUT);

  pinMode(Dp_2k2, OUTPUT);
  pinMode(Dp_10k, OUTPUT);
  digitalWrite(Dp_2k2, LOW);
  digitalWrite(Dp_10k, HIGH);

  delay(3000);
  // now QC protocol is active

}

void Set_9V()
{
  pinMode(Dp_2k2, OUTPUT);
  pinMode(Dp_10k, OUTPUT);
  digitalWrite(Dp_10k, HIGH);
  digitalWrite(Dp_2k2, HIGH);
  pinMode(Dn_2k2, OUTPUT);
  pinMode(Dn_10k, OUTPUT);
  digitalWrite(Dn_2k2, LOW);
  digitalWrite(Dn_10k, HIGH);
}

void Set_12V()
{
  pinMode(Dp_2k2, OUTPUT);
  pinMode(Dp_10k, OUTPUT);
  pinMode(Dn_2k2, OUTPUT);
  pinMode(Dn_10k, OUTPUT);
  digitalWrite(Dn_2k2, LOW);
  digitalWrite(Dn_10k, HIGH);
  digitalWrite(Dp_10k, HIGH);
  digitalWrite(Dp_2k2, LOW);
}

void Set_5V()
{
  pinMode(Dp_2k2, OUTPUT);
  pinMode(Dp_10k, OUTPUT);
  digitalWrite(Dp_10k, HIGH);
  digitalWrite(Dp_2k2, LOW);
  pinMode(Dn_2k2, OUTPUT);
  pinMode(Dn_10k, OUTPUT);
  digitalWrite(Dn_2k2, LOW);
  digitalWrite(Dn_10k, LOW);

}

void Set_20V()
{
// change Voltage Regulator !!!
// do at your own risk 
}

Credits

Shahariar

Shahariar

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The Material/Worldly Life is void setup () { } The Spiritual/After Life is void loop () { }
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