Contact person: AC Communication Signal Device Development

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Location: Bhopal, India

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Signal Requirements for My Project (Point by Point)

1. Types of Signals

Device should handle all common inverter AC indoor-outdoor communication signals:

UART / Serial (3.3V / 5V level)

PWM (Pulse Width Modulation) – duty cycle and frequency based

DC-Shift (voltage shift modulation)


Baud rate range: 2400 – 9600 bps for UART signals.

PWM frequency: 100 Hz – 3 kHz typical.

Voltage levels: 0–5V, 0–12V, 0–15V (configurable or auto-detect).


2. Signal Capture & Decode

Device should read signals from Indoor PCB and Outdoor PCB.

Automatically detect whether signal is UART, PWM, or DC-Shift.

Show frequency, baud rate, voltage on display.

Decode UART data to confirm communication (basic hex view is enough).


3. Signal Translation

If Indoor and Outdoor are from different brands, device should:

Capture Indoor signal and translate it into Outdoor’s format.

Capture Outdoor feedback and translate it into Indoor’s format.


This allows cross-brand communication (for example, Daikin Indoor with LG Outdoor).


4. Signal Simulation

Device must work as simulator in two cases:

1. Indoor Simulator → If only Outdoor PCB is present, device behaves like Indoor and sends proper signals.


2. Outdoor Simulator → If only Indoor PCB is present, device behaves like Outdoor and sends proper feedback signals.



In both cases, compressor, fan, and sensor feedback signals must be simulated so Indoor PCB does not show error.


5. Auto Learn Mode

If a new or unknown brand signal comes, device should:

Capture that signal pattern.

Save it in memory (EEPROM/Flash).

Next time, auto-run that saved profile when the same PCB is connected.



6. Error Indication

If any expected signal is missing (for example, U signal not present, feedback not received):

LED indicator should blink an error code.

LCD display should show an error message such as “Missing Outdoor Signal.”



7. Display & Output

Show on display:

Signal type (UART/PWM/DC-Shift)

Frequency or Baud rate

Voltage level

Compressor/Fan/Sensor emulation status

Error messages


Also allow USB output or serial log for debugging.


8. Safety & Protection

Reverse polarity protection.

Over-voltage cutoff (device should not turn ON if input is greater than 6V DC).

Protection against accidentally connecting 230V phase to signal line.



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Summary for Developer

Device should read, decode, translate, and simulate AC indoor-outdoor signals.

Must support UART, PWM, and DC-Shift protocols.

Should allow cross-brand communication, indoor/outdoor simulation, and auto-learn new signals.

Display, LED, and USB debugging must be included.

Protection features must be implemented." (client-provided description)