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What are we Reverse Engineering?

Inkbird ITH-20R provides direct and accurate display of humidity and temperature.You can choose Fahrenheit or Celsius according to your personal preference.

Specs

SpecValue
MakeInkbird
ModelITH-20R
User Manualhttps://pmod79883-pic31.websiteonline.cn/upload/ITH-2011.pdf
Sampling Period10s

Transmission Frequency

433MHz
Transmission Distance≈300 Feet

Building RTL-433 on Mac


Clone repository

> git clone https://github.com/merbanan/rtl_433.git

Install rtl-sdr and cmake using brew

> brew install rtl-sdr cmake

Build

cd rtl_433/
mkdir build
cd build
cmake ..
make
make install

For more details see: https://github.com/merbanan/rtl_433/blob/master/docs/BUILDING.md

Running RTL_433

> rtl_433 

$ rtl_433
rtl_433 version 19.08-18-g8eecdbb branch master at 201909241811 inputs file rtl_tcp RTL-SDR
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/Users/john.mehan/.config/rtl_433/rtl_433.conf"...
Trying conf file at "/usr/local/etc/rtl_433/rtl_433.conf"...
Trying conf file at "/etc/rtl_433/rtl_433.conf"...

	Consider using "-M newmodel" to transition to new model keys. This will become the default someday.
	A table of changes and discussion is at https://github.com/merbanan/rtl_433/pull/986.

Registered 108 out of 138 device decoding protocols [ 1-4 8 11-12 15-17 19-21 23 25-26 29-36 38-60 63 67-71 73-100 102-103 108-116 119 121 124-128 131-138 ]
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
Tuned to 433.920MHz.
pulse_FSK_detect(): Maximum number of pulses reached!
pulse_FSK_detect(): Maximum number of pulses reached!
pulse_FSK_detect(): Maximum number of pulses reached!
pulse_FSK_detect(): Maximum number of pulses reached!

Other Tests of RTL_433


RadioHead ASK code on ESP8266 Board (Lolin/Wemos mini)

Code

// ask_transmitter.pde
#include <RH_ASK.h>
#ifdef RH_HAVE_HARDWARE_SPI
#include <SPI.h> // Not actually used but needed to compile
#endif
RH_ASK driver(2000, D4, D2, D1); // (bps, RX, TX, PTT)

void setup()
{
    Serial.begin(115200);	  // Debugging only
    Serial.println("\n\nask_transmitter");
}
void loop()
{    
    const char *msg = "hello";
    driver.send((uint8_t *)msg, strlen(msg));
    driver.waitPacketSent();
    delay(200);
}


Results:

$ rtl_433
rtl_433 version 19.08-18-g8eecdbb branch master at 201909241811 inputs file rtl_tcp RTL-SDR
Use -h for usage help and see https://triq.org/ for documentation.
Trying conf file at "rtl_433.conf"...
Trying conf file at "/Users/john.mehan/.config/rtl_433/rtl_433.conf"...
Trying conf file at "/usr/local/etc/rtl_433/rtl_433.conf"...
Trying conf file at "/etc/rtl_433/rtl_433.conf"...

	Consider using "-M newmodel" to transition to new model keys. This will become the default someday.
	A table of changes and discussion is at https://github.com/merbanan/rtl_433/pull/986.

Registered 108 out of 138 device decoding protocols [ 1-4 8 11-12 15-17 19-21 23 25-26 29-36 38-60 63 67-71 73-100 102-103 108-116 119 121 124-128 131-138 ]
Found Rafael Micro R820T tuner
Exact sample rate is: 250000.000414 Hz
[R82XX] PLL not locked!
Sample rate set to 250000 S/s.
Tuner gain set to Auto.
Tuned to 433.920MHz.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ 
time      : 2019-10-02 08:36:26
model     : RadioHead ASK Data len  : 5            To        : 255           From      : 255
Id        : 0
Flags     : 0            Payload   : 104, 101, 108, 108, 111                         Integrity : CRC
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _


RCSwitch code on ESP8266 Board (Lolin/Wemos mini)

Code:

#include <RCSwitch.h>

RCSwitch mySwitch = RCSwitch();

void setup() {
  Serial.begin(115200);
  
  // Transmitter is connected to Arduino Pin #10  
  mySwitch.enableTransmit(D2);
  Serial.println("\n\nSender Started");
  // Optional set protocol (default is 1, will work for most outlets)
  // mySwitch.setProtocol(2);

  // Optional set pulse length.
  // mySwitch.setPulseLength(320);
  
  // Optional set number of transmission repetitions.
  // mySwitch.setRepeatTransmit(15);
  
}

void loop() {
  Serial.print(".");
  mySwitch.switchOn("11111", "00010");
  delay(10000);
}


Results:

Tuned to 433.920MHz.
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:58
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Waveman Switch Transmitter             id        : A
channel   : 4            button    : 3             state     : off
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
time      : 2019-10-02 09:13:59
model     : Akhan 100F14 remote keyless entry      ID (20bit): 0x151
Data (4bit): 0x1 (Lock)


References

ReferenceURL
RTL-SDR: 433.92Mhz ASK/OOK Decoding of Various Devices with rtl_433https://goughlui.com/2013/12/20/rtl-sdr-433-92mhz-askook-decoding-of-various-devices-with-rtl_433/
RTL_433https://github.com/merbanan/rtl_433
Building RTL_433https://github.com/merbanan/rtl_433/blob/master/docs/BUILDING.md
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