Contact person: Programmable, High-Accuracy/Precision Battery-Powered Low Voltage, Low Current Stair Stepper

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Location: Parker, United States

Budget: Recommended by industry experts

Time to start: As soon as possible

Project description:
"Produce, test, and deliver a compact, battery-powered setup that can feed a simple resistive load with a programmable staircase of DC voltages. The supply will be a single Li-Po or Li-Ion pack, yet the output must be anywhere from 0 V up to 18 V at currents up to 300 mA. You are free to base the design on an Arduino, a Raspberry Pi, or any other microcontroller you prefer, as long as the final system is accurate, precise, and reliable.

Core behaviour:

• Up to ten voltage steps, each specified by the user.
• Each step (duration) may last from .50 s to 60.0 s.
Time Start, End, Delivery, and duration accuracy must be .10 seconds, or better.
• A text or CSV file (e.g. “time,voltage” or “start time, duration (sec), voltage”) provides the schedule; the device reads this file at start-up from a micro-SD card, USB stick, SD card or another simple medium (e.g., From PC via USB) to be discussed and agreed to. No on-device buttons or apps are required.

What I expect from you:

• Firmware that parses the file and drives the output accordingly.
• A modest buck/boost stage — or another Vdc delivery technique of your choice — that converts the battery voltage to the requested level with enough accuracy and precision for the load.
• Pinout, schematic, and a concise bill of materials so I can replicate the hardware.
• A detailed build/run guide, and any PC-side scripts or examples needed to generate the schedule file.
• Evidence that the output hits each programmed voltage and timing window (a quick scope capture, data log, or similar is fine).

Keep the design focused on accuracy, precision, and ease of replication: readily available parts, clear wiring, and clean, well-commented code." (client-provided description)