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4 layers85 × 9 mmOSSG v0p4, the printed circuit board in 3D

This version was an attempt to use a 2S battery pack. The main issue is that as of 2022-09-15, there are not many 2S battery charging IC's nor a nice i2C fuel gauge IC, so at the moment, this is a dead end design.

Size
85 × 9 mm
Copper layers
4
Thickness
1.6 mm
Parts
82
Nets
100
Pads
284
Tracks, vias
647, 126
Pours
5
Routed
Yes
KiCad
KiCad 6 (file 20211014)
Created
29 Feb 2024
Updated
29 Apr 2024

Overview

OSSG v0p4 is an open-source printed circuit board by aezrapour, from the aezrapour/RINSIGHT repository on GitHub, published under the MIT licence. It is a 4-layer board of 85 × 9 mm with 82 parts on 100 nets, routed with 647 tracks and 126 vias.

It is built around the ESP32-PICO-D4, CH9102F and H7650-50PR, with the MP2615CGQ-Z, XC61CC3002MR and WS2812C-2020-V1 among its other parts. Its parts include 20 capacitors, 20 resistors, 7 ICs, 7 diodes and 4 transistors. It belongs with the ESP32 and RISC-V boards of this library.

Main components

10

README

electronics_and_firmware/OSSG_v0p4-2S/README.md

Open Source Smartglasses PCB V0.4


This version was an attempt to use a 2S battery pack. The main issue is that as of 2022-09-15, there are not many 2S battery charging IC's nor a nice i2C fuel gauge IC, so at the moment, this is a dead end design.

Features:

  • i2S microphones (non PDM)
  • 2S battery configuration
  • 2S battery charger
  • on/off switch
  • auto switch off when one battery goes below 2.7V
  • the design is missing the 5V to 12V at 1.5A boost circuit that could be based around a SY7088 IC

Parts

82
QtyValueFootprintReferences
60.1uFCapacitor_SMD:C_0402_1005MetricC5, C6, C7, C8, C10, C11
51uFCapacitor_SMD:C_0402_1005MetricC2, C9, C17, C19, C20
410KResistor_SMD:R_0402_1005MetricR3, R4, R5, R7
4WS2812C-2020OSSG_footprints:LED_WS2812C-2020D1, D2, D3, D4
3100KResistor_SMD:R_0402_1005MetricR10, R18, R20
20R*Resistor_SMD:R_0402_1005MetricR1, R2
2100nFCapacitor_SMD:C_0402_1005MetricC1, C12
210uFCapacitor_SMD:C_0402_1005MetricC4, C18
2160KResistor_SMD:R_0402_1005MetricR13, R14
21uF/16VCapacitor_SMD:C_0402_1005MetricC13, C14
22KResistor_SMD:R_0402_1005MetricR8, R9
22SC4617R BRPackage_TO_SOT_SMD:SOT-523Q1, Q2
2442KResistor_SMD:R_0402_1005MetricR11, R12
2884KResistor_SMD:R_0402_1005MetricR15, R19
2LEDDiode_SMD:D_0402_1005MetricD5, D6
1+3.3V_BOOSSG_footprints:Breakout_padsTP8
1.025Resistor_SMD:R_0402_1005MetricR17
1100kResistor_SMD:R_0402_1005MetricR6
1100nF/16VCapacitor_SMD:C_0402_1005MetricC15
110KConnector_PinHeader_1.27mm:PinHeader_1x02_P1.27mm_HorizontalTH1
1200pFCapacitor_SMD:C_0402_1005MetricC3
122uF/16VCapacitor_SMD:C_0402_1005MetricC16
1320KResistor_SMD:R_0402_1005MetricR16
1ANT3216LL00R2400AOSSG_footprints:ANT3216LL00R2400AAE1
1Batt+OSSG_footprints:Breakout_padsTP15
1BattMidOSSG_footprints:Breakout_padsTP17
1CH9102FPackage_DFN_QFN:QFN-24-1EP_4x4mm_P0.5mm_EP2.6x2.6mmU3
1Conn_01x05_MaleConnector_PinHeader_1.00mm:PinHeader_1x05_P1.00mm_HorizontalJ1
1EMF20B02VPackage_TO_SOT_SMD:SOT-23-6Q4
1EN_TPTestPoint:TestPoint_Pad_D1.0mmTP5
1ESP32-PICO-D4OSSG_footprints:ESP32_PICO_D4U2
1GNDOSSG_footprints:Breakout_padsTP16
1GND_BOOSSG_footprints:Breakout_padsTP9
1H7650-50PRPackage_TO_SOT_SMD:SOT-89-3U6
1IO0_TPTestPoint:TestPoint_Pad_D1.0mmTP12
1IO18_BOOSSG_footprints:Breakout_pads_smallTP11
1IO25_BOOSSG_footprints:Breakout_pads_smallTP1
1IO26_BOOSSG_footprints:Breakout_pads_smallTP2
1IO32_BOOSSG_footprints:Breakout_pads_smallTP6
1IO33_BOOSSG_footprints:Breakout_pads_smallTP7
1IO37_ADC1C0OSSG_footprints:Breakout_pads_smallTP4
1IO38_ADC1C1OSSG_footprints:Breakout_pads_smallTP3
1IO5_BOOSSG_footprints:Breakout_pads_smallTP10
1MP2615CGQ-ZOSSG_footprints:MP2615GQ-PU5
1NCP167BMX330TBGOSSG_footprints:REG_NCP167BMX330TBGU7
1PMZ290UNE2YLOSSG_footprints:DFN100X60X40-3NQ3
1PowerOSSG_footprints:SW_SMD_SPDT_Slide_9x6.9-holeSW2
1RB160M-30Diode_SMD:D_SOD-123D7
1RXINTestPoint:TestPoint_Pad_D1.0mmTP14
1SPH0645LMHOSSG_footprints:SPH0645LM4H-B-SMD-GNDU1
1SW_SPSTButton_Switch_SMD:SW_SPST_B3U-3000P-BSW1
1SolderJumper_2_OpenOSSG_footprints:JUMPER-2Psml_Open_RoundedPad2x1mmJP1
1TXINTestPoint:TestPoint_Pad_D1.0mmTP13
1USB_B_MicroConnector_USB:USB_Micro-B_Amphenol_10118194_HorizontalJ2
1XC61CC3002MRPackage_TO_SOT_SMD:SOT-23U4

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Questions

How big is the OSSG v0p4 PCB?

It measures 85 × 9 mm and has 4 copper layers, 1.6 mm thick.

What parts does the OSSG v0p4 use?

82 parts, built around the ESP32-PICO-D4, CH9102F, H7650-50PR and MP2615CGQ-Z. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.

Where can I download the OSSG v0p4 KiCad files?

From the aezrapour/RINSIGHT repository on GitHub, at the commit this page was made from: the board is electronics_and_firmware/OSSG_v0p4-2S/OSSG_v0p4.kicad_pcb and its schematic electronics_and_firmware/OSSG_v0p1_and_v0p2/pcb/ver0.1/msa.kicad_sch. PCBKit opens the board in the browser, with nothing to install.

Can I use the OSSG v0p4 design in my own project?

Its repository publishes it under the MIT licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).