Production Line Monitoring Smart Contract

A comprehensive Clarity smart contract for managing and monitoring manufacturing production lines on the Stacks blockchain.

Overview

This smart contract enables manufacturers to track production lines, record batches, monitor downtime, schedule maintenance, and analyze quality metrics in a decentralized, transparent manner.

Features

1. Production Line Management

• Create and configure production lines with custom capacity
• Assign dedicated managers to each line
• Track line status (active, maintenance, offline)
• Monitor efficiency ratings (0-100%)
• Transfer management rights between principals

2. Production Batch Tracking

• Record production batches with quantity and defect counts
• Automatic quality score calculation per batch
• Link batches to specific production lines
• Track timestamps for production start and end

3. Downtime Recording

• Log downtime incidents with reasons
• Track incident duration in blocks
• Maintain cumulative downtime statistics
• Incident numbering and resolution tracking

4. Maintenance Scheduling

• Schedule preventive maintenance windows
• Track last maintenance date
• Set next maintenance reminder (in blocks)
• Count total maintenance operations

5. Metrics & Analytics

• Real-time quality rate calculation
• Total output tracking per line
• Defect aggregation and analysis
• Downtime analytics
• Incident frequency monitoring

Smart Contract Architecture

Data Structures

Production Lines

• Stores line configuration, manager, status, capacity, and efficiency

Production Batches

• Records batch details including quantity, defects, and quality scores

Downtime Records

• Tracks incidents with reasons, duration, and resolution status

Maintenance Schedules

• Manages maintenance timing and history

Line Metrics

• Aggregates performance data for analytics

Error Codes

Code	Constant	Description
u100	ERR_UNAUTHORIZED	Caller lacks required permissions
u101	ERR_NOT_FOUND	Resource does not exist
u102	ERR_INVALID_INPUT	Invalid parameter provided
u103	ERR_ALREADY_EXISTS	Resource already exists
u104	ERR_LINE_INACTIVE	Production line is not active
u105	ERR_INVALID_STATUS	Invalid status value

Key Functions

Public Functions

create-production-line

(create-production-line (name (string-ascii 50)) (capacity uint))

Creates a new production line. Returns the new line ID.

Parameters:

• name: Production line identifier (max 50 characters)
• capacity: Maximum production capacity

Returns: (ok uint) - New line ID

---

record-production-batch

(record-production-batch (line-id uint) (quantity uint) (defects uint))

Records a completed production batch.

Requirements:

• Caller must be line manager
• Line must be active
• Defects cannot exceed quantity

Returns: (ok uint) - New batch ID

---

record-downtime

(record-downtime (line-id uint) (reason (string-ascii 100)) (duration uint))

Logs a downtime incident.

Parameters:

• line-id: Target production line
• reason: Explanation for downtime
• duration: Downtime length in blocks

Returns: (ok uint) - Incident ID

---

schedule-maintenance

(schedule-maintenance (line-id uint) (blocks-until uint))

Schedules next maintenance window.

Parameters:

• line-id: Target production line
• blocks-until: Blocks until next maintenance

Returns: (ok bool)

---

update-line-status

(update-line-status (line-id uint) (new-status (string-ascii 20)))

Changes production line operational status.

Valid Statuses: "active", "maintenance", "offline"

Returns: (ok bool)

---

update-efficiency

(update-efficiency (line-id uint) (efficiency uint))

Updates line efficiency rating (contract owner only).

Parameters:

• efficiency: Rating from 0-100

Returns: (ok bool)

---

transfer-management

(transfer-management (line-id uint) (new-manager principal))

Transfers line management to another principal.

Returns: (ok bool)

---

Read-Only Functions

get-line-info

Returns complete production line details.

get-batch-info

Retrieves batch information by batch ID.

get-downtime-record

Fetches specific downtime incident details.

get-maintenance-schedule

Returns maintenance schedule for a line.

get-line-metrics

Retrieves aggregated performance metrics.

calculate-quality-rate

Calculates quality rate as percentage: ((total-output - total-defects) / total-output) * 100

get-line-counter

Returns total number of production lines created.

get-batch-counter

Returns total number of batches recorded.

Usage Example

;; Create a new production line
(contract-call? .production-monitor create-production-line "Assembly Line A" u1000)
;; Returns: (ok u1)

;; Record a production batch
(contract-call? .production-monitor record-production-batch u1 u500 u10)
;; Returns: (ok u1) - Batch with 500 units, 10 defects

;; Record downtime
(contract-call? .production-monitor record-downtime u1 "Equipment malfunction" u100)
;; Returns: (ok u1)

;; Check quality rate
(contract-call? .production-monitor calculate-quality-rate u1)
;; Returns: (ok u98) - 98% quality rate

;; Schedule maintenance
(contract-call? .production-monitor schedule-maintenance u1 u1000)
;; Returns: (ok true)

Security Considerations

• Manager Authorization: Only line managers can record batches and downtime for their lines
• Owner Privileges: Only contract owner can update efficiency ratings
• Input Validation: All inputs are validated before processing
• Status Checks: Production recording only allowed on active lines
• Immutable Records: Batch and downtime records are permanent once created

Deployment

Deploy this contract to Stacks blockchain using Clarinet or the Stacks CLI:

clarinet contract deploy production-monitor

Testing

Run unit tests to verify functionality:

clarinet test

Future Enhancements

• Supply chain integration
• Real-time alerts for quality thresholds
• Multi-signature management approval
• Energy consumption tracking
• Operator performance metrics
• Integration with IoT sensors