Time-Delay Electronic Controller
AssemblyA quartz-crystal timer that counts down from a programmed time to unlock, with battery backup, keypad input, and audit log of unlock events. A full specification article for this item is being written. Meanwhile its bill of materials and connections are below.
Time-Delay Electronic Controller parts and their functions
9 top-level parts · 11 parts in total · full bill of materials below
| # | Part | Qty | What it does |
|---|---|---|---|
| 1 | Safe Deposit System Rtc Module | 1× | DS3232 or similar, 32 kHz quartz oscillator, maintains accuracy within ±2 minutes per year |
| 2 | Microcontroller | 1× | ATmega328 or ARM Cortex-M0, 4 KB RAM (sufficient for timer logic), clock input from RTC |
| 3 | Bare PCB | 1× | Timer control logic, relay driver outputs (2×), keypad input, display driver |
| 4 | Keypad | 1× | Numeric membrane keypad, 4 × 3 grid, water-resistant sealed buttons (indoor use typically) |
| 5 | LCD Panel | 1× | 16×2 character display shows current time, countdown timer, unlock status ("Locked until 06:00 AM") |
| 6 | Backup Battery | 1× | 12V 7 Ah lithium or lead-acid battery, provides 8–24 hour backup power on AC loss |
| 7 | Battery Charger | 1× | Float charger, 12 VDC 1 A, keeps battery topped up during normal AC operation |
| 8 | Connector | 3× | AC input jack, solenoid relay outputs (2×), backup battery connection |
| 9 | Power Supply | 1× | 24 VDC 500W industrial power supply, dual outputs (one for solenoids, one for control logic) |
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Bill of materials for Time-Delay Electronic Controller
9 top-level lines · 9 rows shown · 11 parts total · indented to 3 levels| # | Item / sub-assembly | Part no. | Qty/assy | Ext. qty | Parts | Type |
|---|---|---|---|---|---|---|
| 1 | Safe Deposit System Rtc Module | time-delay-safe-safe-deposit-system-rtc-module | 1× | 1 | · | part |
| 2 | Microcontroller | mcu | 1× | 1 | · | part |
| 3 | Bare PCB | pcb-bare | 1× | 1 | · | part |
| 4 | Keypad | time-delay-safe-keypad | 1× | 1 | · | part |
| 5 | LCD Panel | lcd-panel | 1× | 1 | · | part |
| 6 | Backup Battery | time-delay-safe-backup-battery | 1× | 1 | · | part |
| 7 | Battery Charger | time-delay-safe-battery-charger | 1× | 1 | · | part |
| 8 | Connector | connector | 3× | 3 | · | part |
| 9 | Power Supply | power-supply | 1× | 1 | · | part |
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Where the time-delay electronic controller is used
1 product across 1 domain contain it, directly or inside a sub-assemblyUsed in 1 assembly
Sourcing: possible vendors
Browse the supplier directory → Prices, MOQ, and lead times are algorithmic estimates, not quotes, and not claims about these companies. Company mappings are curated by keyword; est. price band $1–$200. How estimates work| Vendor | HQ | Specialty | MOQ | Lead time |
|---|---|---|---|---|
|
🇨🇳JLCPCB
jlcpcb.com ↗
|
Shenzhen, CN | PCB fabrication | 100 pcs | 2–4 wks |
|
🇨🇳PCBWay
pcbway.com ↗
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Shenzhen, CN | PCB fab & assembly | 100 pcs | 2–4 wks |
| scc.com.cn ↗ | Shenzhen, CN | PCB manufacturer | 100 pcs | 2–4 wks |
| shogini.com ↗ | Mumbai, IN | PCB manufacturer | 100 pcs | 2–4 wks |
| venture.com.sg ↗ | Singapore | Electronics contract mfg | 100 pcs | 2–4 wks |