https://www.eric-navarrete.com/work-1 daily 1.0 2026-01-27 https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/2da9b76e-8092-4e0e-83b2-7cc9e463e887/PXL_20210714_222813384%7E2.jpg Home (2021) A QI wireless charger test board. This was a useful test to make sure my component values are correct before integrating this chip into future projects. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/f84edc09-78ce-4026-843f-e1ce2a9253fc/IMG_20190109_003710_370.jpg Home (2019) A dev board for the ATtiny 10 mcu. It features an IDC connector for easy connection to an Atmel ICE programmer. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/1665594202993-RHS9RDOVCNT2BU8QNEPB/20160806_003937.jpg Home (2016) A low battery audible alert for a small remote control glider. Uses an ATTiny mcu to measure battery voltage and trigger a piezo alarm when below a threshold. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/1665594227689-3AC7IWZ6W8W8I2LBSXMF/IMG_20181016_171348.jpg Home (2018) A wearable light up earring using an ATtiny 10 mcu. Uses a thermistor to measure ambient temperature and change the flashing rate of the LED. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/4b9f1fd1-112a-435d-a502-bee86745b63e/MVIMG_20180314_081422+-+Copy.jpg Home (2018) A dev board for the SAM D21 mcu. It features USB C, and a buck voltage regulator integrated on the board. https://www.eric-navarrete.com/work-1/project-one-p35th monthly 0.5 2022-10-12 https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/30b269f9-6966-42e5-afc5-2fa651f27739/20160420_174737.jpg Home - Lone Worker Alert device (2016) The first concept design that was 3D printed to test ergonomics. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/af7926e1-5f2f-400c-81a7-7540c11cd143/20160420_174825.jpg Home - Lone Worker Alert device (2016) The second concept design, larger than previous to help accommodate the electronics. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/94a516b0-1a66-40b2-9b77-37ef2f67f293/20160420_174845.jpg Home - Lone Worker Alert device (2016) The concept wrist piece that will house status LEDs and input buttons. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/c11ff9b7-1460-41c8-9ac6-0018c7c85fc2/20160420_174910.jpg Home - Lone Worker Alert device (2016) The first functional concept. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/46bf9546-83c5-4a74-af45-45c9aaaf8471/20151216_221829.jpg Home - Lone Worker Alert device (2016) This is a component of the CAD model I designed for the final design. This was my first time using the CAD software PTC Creo, and it was a great learning experience. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/341578f3-2616-4132-93ba-657cb4da3f08/20151215_125230.jpg Home - Lone Worker Alert device (2016) Technical drawing of the assembly. Created with the help of the Cambridge university engineering department https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/d7467ffb-2f2d-4669-a385-38e7842cdeff/20160112_224001.jpg Home - Lone Worker Alert device (2016) To improve the surface finish of the parts, I coated them with epoxy and sanded them down. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/1b2492d9-1588-4a90-9080-c160b7a4b648/20160112_230046.jpg Home - Lone Worker Alert device (2016) https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/8f18174f-54d2-4cb2-9747-4d885938f68b/20160113_175058.jpg Home - Lone Worker Alert device (2016) The completed case. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/aa571507-1674-40cc-a9ac-a4e500b6ec5a/20160113_175110.jpg Home - Lone Worker Alert device (2016) Test fit of the AA battery holder in the case. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/5751d695-9c7b-4e58-a904-99b259781156/20160111_081328.jpg Home - Lone Worker Alert device (2016) The finished watch housing awaiting wiring. It has two momentary push buttons and 3 LEDs. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/aa67ef7d-b1cf-4050-a942-34e966a980ad/1452550202449.jpg Home - Lone Worker Alert device (2016) Here is the wrist unit with the strap attached. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/ed568ffa-e537-47c9-91a7-384caf1f62bb/20160419_165246.jpg Home - Lone Worker Alert device (2016) I worked with the team to complete the wiring of the device. We used a VGA cable with the connector ends cut off to connect the wrist unit to the main enclosure. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/793577e5-b9ad-47d9-8396-d0a6ac7672ae/20160301_132258.jpg Home - Lone Worker Alert device (2016) Here is of the completed design internals. The device is powered by 4 AA batteries, and uses an Arduino UNO with a GSM shield to interface with the buttons and send text messages. https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/e92f993f-e813-4eed-9b9a-fa8daf7b4540/20160202_131341.jpg Home - Lone Worker Alert device (2016) Wear demonstration by a team member. https://www.eric-navarrete.com/work-1/project-four-cg79k monthly 0.5 2026-01-26 https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/28dea16e-9acb-450e-99de-1ca180a5d578/IMG_20180613_121739.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/4f2ea847-1f12-4be5-9d61-69a1eb950666/IMG_20180613_121749.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/9a1f3d29-4da9-42f8-a88f-ba6d93ec6447/IMG_20180624_124630.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/d1bb1551-e55c-4554-a081-47dc882e2fad/IMG_20180613_143438.jpg 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https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/7e71dd58-ff95-4ec9-96e6-63d661095be7/Screenshot+2023-03-17+230552.png https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/fa6599a5-da3c-4612-ba75-bd056111ec24/IMG_20191015_194035.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/a8f3a9fc-833e-4744-ac6e-fff0633799a4/IMG_20191015_192822.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/6603e7da-5bcd-402a-b36b-bc7d7fb184a1/IMG_20191015_192801.jpg https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/514b8da2-b59e-42d9-b62b-3b9231db7b63/Screenshot+2023-03-17+230621.png https://www.eric-navarrete.com/work-1/project-four-cg79k-8rh49-kas29-439sw-dzxh3-5sh9t-n7jgr-kp6xa monthly 0.5 2023-01-16 https://images.squarespace-cdn.com/content/v1/61f02347037e8e05ae43eef5/e4399650-fb9f-46ee-9a6c-8fb09cccd3dd/PXL_20210113_175140596.jpg 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