A sophisticated Oven Reflow Soldering Controller implemented entirely in 8052 Assembly. This project features a high-performance, non-blocking cooperative multitasking architecture, a pub-sub communication pattern, and a dual-interaction system (Hardware & GUI).
- Pure Assembly Implementation: 100% of the control logic, mathematical routines, and peripheral drivers are written in 8052 assembly for deterministic, real-time performance.
- Cooperative Multitasking: Uses a high-speed main loop to poll multiple Finite State Machines (FSMs), ensuring that temperature sensing, UI updates, and safety checks happen concurrently without blocking the processor.
- Pub-Sub Interaction Pattern: Utilizes bit-addressable memory (BSEG) as a "signal bus." Modules "publish" status flags (e.g., temperature reached, emergency stop), and independent "subscriber" modules (like the PWM driver or Buzzer) react to these signals.
- Non-Blocking I/O: Implements a
Serial_RX_Pumpand state-machine-based debouncing (PBx_DEB) to ensure the system remains responsive to user input at all times.
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Precision Thermal Profiling:
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7-Stage Control: Manages the full cycle: Preheat (Ramp to Soak), Soaking, Ramp to Reflow, Reflow, Cooling, and Process Completion.
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P-Control Power Output: Utilizes Proportional control logic during the reflow stage to maintain precise temperature curves and prevent overshoot.
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Soft-PWM: Drives a Solid State Relay (SSR) via software-generated PWM for granular heater control.
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Dual-Interaction System:
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Hardware Interface: 4x4 Matrix Keypad for parameter entry, 1602 LCD for status messages, and 7-segment displays for live temperature/time tracking.
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Host GUI: Full remote control and telemetry via UART (57600 Baud). Users can set parameters, start/stop the process, and monitor live data from a PC.
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Automated Peripherals:
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Automated Cooling: Triggers an external processor (Arduino) via GPIO during the cooling phase to activate fans.
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Remote Alerts: Automatically signals the host to send an email notification once the soldering process is successfully completed.
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Safety Engine: Includes a
Safety_Check_TCmodule that continuously monitors thermocouple integrity, triggering an immediate emergency shutdown if sensor failure is detected.
| Peripheral | Pin | Function |
|---|---|---|
| SSR Heater | P1.3 |
PWM Output for power control |
| Cooling Fan | P4.0 |
GPIO trigger for external fan/Arduino |
| Buzzer | P1.5 |
Audio alerts for state transitions |
| UART | TX/RX |
57600 Baud communication with Host GUI |
| LCD Data | P0.x |
8-bit parallel display interface |
Control_FSM: The master logic controller governing the reflow state machine.SEC_FSM: Precise non-blocking timekeeper for soak and reflow durations.proportional_power_control: Computes heater duty cycle based on thermal error.Serial_Process_Line: Command parser for incoming GUI instructions.Read_Thermocouple: High-frequency ADC sampling for temperature monitoring.
- Configure: Set your desired Soak/Reflow temperatures and durations via the Keypad or GUI.
- Start: Initiate the process using the physical "Start" button or the GUI command.
- Monitor: The system provides live feedback on the LCD (current state) and 7-segment displays (temperature).
- Stop: An emergency stop is available via hardware button or GUI at any time.
Developed for the Intel 8052 (DE10-Lite FPGA platform).