vault backup: 2026-07-11 16:48:59

Projects/Time Clock.md

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+---
+active: true
+tags: project
+created: 2026-06-08 19:27
+---
+## Goal
+
+Build a time clock with:
+
+- Hangs on the wall
+- LCD backlit clock
+- Fingerprint reader
+- Keypad for PIN and UI
+- Simple clock-in/clock-out interface
+- Way to generate a help request
+- System connects to a backend database that stores the timecard data
+- PoE for power
+- Built in speaker for sound effects
+## Tasks
+
+- [x] Order parts ➕ 2026-06-08 ✅ 2026-07-11
+- [x] Print two halves of the case (rev 1) ➕ 2026-07-09 ✅ 2026-07-09
+- [x] Adjust case halves ➕ 2026-07-09 ✅ 2026-07-09
+- [x] Print rev 2 of cases ➕ 2026-07-09 ✅ 2026-07-09
+- [x] Install inserts into the case halves ➕ 2026-07-09 ✅ 2026-07-10
+
+## Notes
+
+The FPM10A (or DY50) is a highly popular optical fingerprint sensor that communicates over a TTL serial interface. It features an internal DSP chip that handles rendering, calculation, and feature-finding, making it exceptionally easy to use with an Arduino for smart locks and access control projects.
+### Wiring Connections
+
+The FPM10A usually comes with a 6-pin connector, but you only need to use the 4 pins designated for power and serial communication.
+
+- **Red Wire (VCC)**: Connect to Arduino **5V**
+- **Black/Green Wire (GND)**: Connect to Arduino **GND**
+- **Green Wire (TXD)**: Connect to Arduino Digital Pin **2**
+- **White/Yellow Wire (RXD)**: Connect to Arduino Digital Pin **3**
+## References
+
+- [FPM10A Fingerprint Sensor](https://doc.grablo.co/en/docs/user-manuals/i-o-device/as608-fpm10a-fingerprint-sensor/#3.)
+- [`rppal uart`](https://docs.rs/rppal/latest/rppal/uart/index.html)
+- [`Grow-r502-a_fingerprint_sensor`](https://crates.io/crates/Grow-r502-a_fingerprint_sensor)
+- [`bell ding 1.wav`](freesound.org/people/5ro4/sounds/611113/)
+