Coffin Tester

Part Selection

Parts
Name	Image	Details	Considerations
Small Wooden Coffin		Small Body Storage Cheap and Wooden	Just another item to put me on a watch list
ArduCam ESP32S Uno w/ PSRAM		OV2640 Camera ESP32S WiFi BLE SD MMC	Based on AI-Thinker ESP32 Camera Configuration and hardware setup Discontinued hardware, so time to use.
SFX Halloween Module		Sound and LED Sequences Strobe Function Sound/Vibration Activation Demo Button	Prebuilt Unit Already themed for coffin themed project
Round Display		1.28 inch LCD Module 240 x 204 Pixels GCA901A Controller
SD Card Adapter		Micro SD Storage Board SPI Interface
Battery Holders	File:JAC AAA Battery Holders.jpg.jpg x200px	1 AAA Cell 2 AAA Cells	Volume Issues 2 AA Holder used was not messed up like the one in this photo.
ICR18650 Battery		2200mAh 3.7V	Had one lying around
PC817 Optocoupler	File:JAC .jpg x200px

Build Details

3 AAA battery pack too large, therefore a single and double battery pack wired together to accommodate space issues. Coffin walls carved out to accommodate board.

Project Surprises:

GPIO02 boot-up tests for PSRAM voltage requirement interfered with HSPI Bus usage. Requires eFuse setting to voltage PSRAM voltage level for HSPI normal operation ESP32 Cam with AI-Thinker hardware setup can be used for the project with a simple pin assignment change. An overly elaborate method for using a vibrating motor to trigger SFX module, isolating the module electrically from Microcontroller abandon due to unnecessary complexity and stray triggering from handling project. SFX module uses High Brightness LEDs that cause short bursts of high current that have to be handles by separate battery pack in order to not require additional power supply circuitry for a common power supply. I had a ICR18650 lying around, so battery operation of project utilizing built in charging of the ArduCam. Then again, it could be a self-destruct method.

Programming Elements

TFT display for the ArduCam HSPI usage Facial Detection Code Simple RAW Image decoding for saved images Camera image buffer display to TFT display