In this project I wanted to build a test bench specifically designed for timer coding and bus communication tests. This tool will be very useful to me, particularly in perfecting an interconnection between several timers, relays, or even sensors. It was manufactured according to personal requirements in terms of mobility, and input output connections outside the device for the development of new interconnect devices based on Arduino.
This device is made up of an Arduino Nano (the master) which is located in the timer, and an Arduino Mega (the slave). They communicate either by Serial connection via the Tx/Rx pins, or thanks to the Bus connection via the SDA and SCL pins of each Arduino. It also has a UHF receiver for remote control using a digital talkie walkie. I also connected several input outputs of the Arduino Mega, as well as the relay outputs to robust aviation connectors which will serve me in the future.
The operating principle following the coding is very simple and basic for the first attempts: Program the time via the numeric keypad, start the countdown, when the timer reaches 0, the master (Arduino Nano) sends a message to the slave (Arduino Mega), following the message received, it activates a series of jerky relay.
The power supply is managed by two separate batteries: a 12V 2500mah lithium-ion battery for the timer, a 12V 7A lead acid battery for powering the Arduino Mega and relay inputs and outputs, also a battery recharging system.
Technical Deep-Dive
- Inter-Processor Orchestration & Bus Forensics:
- The Nano-Master Logic-Hub: Acting as the primary temporal-sequencer. Forensics involve the measurement of the "Intersystem-Command Latency" across the $SDA/SCL$ $(I2C)$ and $TX/RX$ $(UART)$ buses. The diagnostics focus on "Bus-Contention Mitigation," ensuring that the Nano can poll the keypad matrix and update the 8-digit telemetry-display without inducing temporal-drift harmonics.
- The Mega-Slave Actuation-Engine: Responsible for high-density I/O and relay diagnostics. Forensics include the verification of the "Aviation-Interconnect Signal-Fidelity" across secondary peripherals. The diagnostics utilize a deterministic command-parsing logic to trigger 8-channel relay patterns upon receipt of the Master's "Zero-State" trigger-diagnostic.
- HMI Input & Display-Matrix Diagnostics:
- The Membrane-Keypad Probe: Utilizing a 4x4 matrix-scan routine. Forensics include the measurement of the "Key-Bounce Temporal-Width" to ensure precise numeric-entry in high-interference lab environments.
- 8-Digit Seven-Segment Analytics: Implementing a high-speed multiplexing heuristic. The diagnostics focus on "Persistence-of-Vision (POV) Luminosity Harmonics," absolute for clear telemetry-viewing during active load-test forensics.
Engineering & Implementation
- Power-Rail & Electrical-Isolation Forensics:
- Dual-Battery Reservoir Analytics: Utilizing a $12\text{V } 2500\text{mAh}$ Li-ion for the logic-core and a $12\text{V } 7\text{A}$ Lead-Acid for high-current acting-loads. Forensics include the measurement of the "Transient-Voltage Spike Mitigation" during relay-commutation to prevent MCU-reset diagnostics.
- Inductive-Load Suppression: The diagnostics focus on "Flyback-Harmonics," ensuring that the relay-coil back-EMF is absorbed before inducing logic-level jitter.
- Remote-Control & RF-Telemetry Harmonics:
- UHF-Receiver Integration: Enabling long-range trigger forensics via digital talkie-walkies. Forensics include the measurement of the "RF-Signal-Noise Floor" within the metal-chassis enclosure.
Conclusion
Timer-Test-Bench represents the pinnacle of Asynchronous Lab-Evaluation Diagnostics. By mastering Inter-Processor Forensics and Temporal-Orchestration Heuristics, this project delivers a robust, professional-grade diagnostic platform that provides absolute timing-clarity through sophisticated multi-bus diagnostics.
Temporal Persistence: Mastering evaluation telemetry through inter-processor forensics.
