From a851a2d646f439f7126c232ba1524c55a8990872 Mon Sep 17 00:00:00 2001 From: Sadeep Madurange Date: Fri, 9 Jan 2026 16:45:56 +0800 Subject: Remove _site from git. --- _site/log/fpm-door-lock-lp/breadboard.jpg | Bin 46771 -> 0 bytes _site/log/fpm-door-lock-lp/footprint.png | Bin 198127 -> 0 bytes _site/log/fpm-door-lock-lp/gerber.zip | Bin 89431 -> 0 bytes _site/log/fpm-door-lock-lp/index.html | 110 ------------------------------ _site/log/fpm-door-lock-lp/pcb.jpg | Bin 68237 -> 0 bytes _site/log/fpm-door-lock-lp/pcb1.jpg | Bin 37068 -> 0 bytes _site/log/fpm-door-lock-lp/source.tar.gz | Bin 29473 -> 0 bytes _site/log/fpm-door-lock-lp/thumb_sm.jpg | Bin 18380 -> 0 bytes _site/log/fpm-door-lock-lp/video.mp4 | Bin 13264594 -> 0 bytes 9 files changed, 110 deletions(-) delete mode 100644 _site/log/fpm-door-lock-lp/breadboard.jpg delete mode 100644 _site/log/fpm-door-lock-lp/footprint.png delete mode 100644 _site/log/fpm-door-lock-lp/gerber.zip delete mode 100644 _site/log/fpm-door-lock-lp/index.html delete mode 100644 _site/log/fpm-door-lock-lp/pcb.jpg delete mode 100644 _site/log/fpm-door-lock-lp/pcb1.jpg delete mode 100644 _site/log/fpm-door-lock-lp/source.tar.gz delete mode 100644 _site/log/fpm-door-lock-lp/thumb_sm.jpg delete mode 100644 _site/log/fpm-door-lock-lp/video.mp4 (limited to '_site/log/fpm-door-lock-lp') diff --git a/_site/log/fpm-door-lock-lp/breadboard.jpg b/_site/log/fpm-door-lock-lp/breadboard.jpg deleted file mode 100644 index 2bf47a9..0000000 Binary files a/_site/log/fpm-door-lock-lp/breadboard.jpg and /dev/null differ diff --git a/_site/log/fpm-door-lock-lp/footprint.png b/_site/log/fpm-door-lock-lp/footprint.png deleted file mode 100644 index 5511bf1..0000000 Binary files a/_site/log/fpm-door-lock-lp/footprint.png and /dev/null differ diff --git a/_site/log/fpm-door-lock-lp/gerber.zip b/_site/log/fpm-door-lock-lp/gerber.zip deleted file mode 100644 index 19a9d19..0000000 Binary files a/_site/log/fpm-door-lock-lp/gerber.zip and /dev/null differ diff --git a/_site/log/fpm-door-lock-lp/index.html b/_site/log/fpm-door-lock-lp/index.html deleted file mode 100644 index a39a34e..0000000 --- a/_site/log/fpm-door-lock-lp/index.html +++ /dev/null @@ -1,110 +0,0 @@ - - - - - - Fingerprint door lock (LP) - - - - - - - - - - - -
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FINGERPRINT DOOR LOCK (LP)

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18 AUGUST 2025
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Second iteration of the RF door lock. Old version worked -but drew too much quiescent current. Sensor and servo pulled 13.8mA and 4.6mA -idle. Linear regulators were a disaster. Battery didn’t last 24 hours.

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Redesigned the PCB completely. Tossed RF modules and the second MCU. Connected -R503 directly to the ATmega328P. Sensor now mounts on door exterior, servo -attaches to interior knob, MCU stays on the back to prevent tampering.

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PCB specs: 2-layer, 1oz copper, 0.3mm traces (1mm for power and servo). Ground -plane on bottom layer.

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Solved idle power draw with MOSFETs. 2N7000 and NDP6020P cut power to sensor -and servo before deep sleep. Through-hole MOSFETs that switch at 3.3V are -getting harder to find. NDP6020P already obsolete.

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Replaced linear regulators with MP1584EN DC-DC buck converters. No RFM–noise -isn’t a big concern. Buck’s pin breakout not great–wouldn’t fit commercial dev -boards.

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Squeezed more power savings by underclocking MCU to 8MHz/3.3V. Combined -with buck converters: 56% total power savings.

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Wake sequence: MCU activates FPM MOSFET, unlocks FPM over UART, scans and -matches fingerprint. Match triggers blue LED, servo MOSFET, PWM signal to -unlock. No match triggers red LED. MOSFETs off, back to sleep.

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Total power savings: 99.9% (30.6mA → 2.9μA). Verdict: Fixed.

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Commit: -7529094 -| Gerber: gerber.zip

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by W. D. Sadeep Madurange

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© ASCIIMX - 2026

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