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STD Cat Tracker

License: Public Domain

Mode: Editors' pick

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Update time: 2022-03-24 09:40:34
Creation time: 2019-11-23 19:14:14
Description
The goal of the project is to help cat owners to locate their lost cat. The construction is based on S76G chip (SEMTECH SX1276, STM32L073x & SONY CXD5603G GPS). The device will wake up from the deep sleep each hour, get GPS/LORA (approx. traingulation) coordinates and send them over LORA to the server. Android application can than display the cat route on the map. I assume power supply by three Zinc-Air 675 batteries (11.6x5.4mm 620 mAh), need to add the second LDO to 3.3V, with expected battery life about 3 months. The PCB 6, see picture, is working (SWD FW Upload, UART RX/TX Commands) and I can send mannualy LORA test messages to server. The problem is I can't get GPS coordines on wire antenna even at the top of the hill.
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ID Name Designator Footprint Quantity
1 15nF C15 C0201 1
2 100nF C1,C5 C0201 2
3 10pF C7,C6 C0201 2
4 33pF C8 C0201 1
5 NC C9,C10,C13,C12 C0201 4
6 GPS LNA IC1 BGS12SN6E6327XTSA1 1
7 TI LDO 3.3V U3 DQN0004A 1
8 TI LDO 1.8V U2 DQN0004A 1
9 8.2nH L1 L0201 1
10 47pF C11 C0201 1
11 S76G U1 S76G 1
12 32.768KHz X1 OSC-SMD_4P-L2.0-W1.2-L 1
13 NT2016SA-26M X2 NT2016SA-32M 1
14 1uF C14,C3,C4,C2 C0201 4
15 GPS P3 PAD_OVAL_2X5MM 1
16 47K R2,R1 R0201 2
17 10K R3 R0201 1
18 PAD_Oval_1x2.3mm P7,P5,P8,P6 PAD_OVAL_2X5MM 4
19 + P1 PAD_OVAL_2X5MM 1
20 - P2 PAD_OVAL_2X5MM 1
21 LoRa P4 PAD_OVAL_2X5MM 1

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